Archive

Archive for the ‘Planets’ Category

Ephemeris: 04/17/2024 – Where have all the planets gone?

April 17, 2024 Comments off

This is Ephemeris for Wednesday, April 17th. Today the Sun will be up for 13 hours and 36 minutes, setting at 8:31, and it will rise tomorrow at 6:52. The Moon, 2 days past first quarter, will set at 5:04 tomorrow morning.

Let’s find out where the naked-eye planets have wandered off to this week, and see what planets are left. Bright Jupiter is very low and in the west. It will set at 10:23 pm. We are getting close to losing Jupiter in the evening sky. Comet 12P/Pons-Brooks is just below-left of it. Observers in the Southern Hemisphere might now get a chance to spot it, but I believe it’s too far gone for us. In the morning, Mars and Saturn will be very close together in the east southeastern sky at 6:30. They will be fighting the bright morning twilight and low altitude then. Saturn will be difficult to see right now in the twilight . It will look fairly different this year and next with its rings nearly edge on to us. They will look more like a line through the planet.
The astronomical event times given are for the Traverse City/Interlochen area of Michigan (EDT, UT–4 hours). They may be different for your location.

Addendum

The five naked eye planets and Comet Pons-Brooks are located near the Sun
The five naked eye planets and Comet Pons-Brooks are located near the Sun . This image you see the Sun if the Earth had no atmosphere, at solar noon which is about 1:41 PM. Saturn is the farthest planet from the Sun at about 42°. Anything to the right of the Sun is a morning planet, anything to the left is an evening planet. And since Jupiter is above the Sun it can be seen more easily in the evening than can Saturn in he morning, which is below the Sun. Created using Stellarium.
Jupiter and Venus found in a photograph of the total solar eclipse
Jupiter and Venus found in a photograph of the total solar eclipse of April 8th 2024 with a smartphone camera by one in our party. Credit Jeff Busch.
The planet Jupiter shown here much brighter than it will actually appear tonight
The planet Jupiter shown here much brighter than it will actually appear tonight at 9:30 PM, or about an hour after sunset. It’s altitude will be about 9° above the horizon. Observers south of us will see Jupiter a little bit higher in the sky at the same time period after sunset. Created using Stellarium.
The Moon is a might be seen in binoculars
The Moon is a might be seen in binoculars or a small telescope this evening, April 17th 2024. Select features are labeled. Created using Stellarium, LibreOffice Draw, and GIMP.
Saturn and Mars as they might be glimpsed early in the morning
Saturn and Mars as they might be glimpsed early in the morning at 6:00 AM, about an hour before sunrise. Saturn is brighter than Mars, however Saturn is dimmer than it normally is mainly because it’s rings are closing and nearly edge on. When the rings are at their most open they contribute more to the brightness of Saturn than the planet does. Created using Stellarium.

None of the planets are good telescopic objects now, due to their low position in the sky, and twilight.

The naked-eye planets, Comet Pons-Brooks, and the Moon at sunset and sunrise on a single night
The naked-eye planets, Comet Pons-Brooks, and the Moon at sunset and sunrise on a single night, starting with sunset on the right tonight, April 17th 2024. The night ends on the left with sunrise tomorrow morning on the 18th. Click or tap on the image to enlarge it. Created using my LookingUp app and GIMP.

Categories: Ephemeris Program, Naked-eye planets, Observing, Planets Tags: , , , , , ,

Ephemeris: 04/10/2024 – Where have the naked-eye planets wandered off to?

April 10, 2024 Comments off

This post was updated due to it being uploaded late, and without illustrations. This was due to my recovery from the mad dash eclipse trip Sunday through Tuesday. By the way it was glorious! I shall recount it soon in an Ephemeris Extra post.

This is Ephemeris for Wednesday, April 10th. Today the Sun will be up for 13 hours and 16 minutes, setting at 8:22, and it will rise tomorrow at 7:04. The Moon, 2 days past new, will set at 11:21 this evening.

Let’s find out where the naked-eye planets have wandered off to this week, and see what planets are left. Bright Jupiter is low and in the west, and tonight only can be seen below the crescent Moon. It will set at 10:25 pm. We are getting close to losing Jupiter in the evening sky. Comet 12P/Pons-Brooks is just below-right of it. Though officially naked-eye brightness, one has to have very good eyes, binoculars or telescope to spot it. In my Wednesday blog posts at bobmoler.wordpress.com I have finder charts. In the morning Mars, and Saturn will be very close together in the east southeastern sky at 6:30. They will be fighting the bright morning twilight and low altitude then.

The astronomical event times given are for the Traverse City/Interlochen area of Michigan (EDT, UT–4 hours). They may be different for your location.

Addendum

The Moon, Jupiter and Comet Pons-Brooks for 9:30 PM Thursday April 11th 2024. Due to the late post I’m showing this for tomorrow night. Created using Stellarium .
Here is a finder chart for Comet Pons-Brooks for the next week at 9:30 PM. Jupiter is also in the field. The first position is marked with the name, month and day, and the approximate magnitude. The chart shows a comet tail. The tail will probably not be visible visually, however if it is visible, that is the direction it will be pointing. Created using Cartes du Ciel (Sky Charts).
The three day old Moon as it might appear Thursday at 9:30 PM April 11th 2024 through binoculars or a small telescope. Selected features are labeled. Created using Stellarium, LibreOffice Draw, and GIMP.
Mars and Saturn as they may appear side by side tomorrow morning April 12th 2024 at about 6:15 AM. They are probably shown somewhat brighter than they would normally appear in the sky. Created using Stellarium , LibreOffice Draw, and GIMP.
Jupiter as it might appear in a telescope at 9:30 April 11, 2024 in this erect image, showing the position of its Galilean moons. Jupiter’s apparent diameter is 33.54″. Created using Cartes du Ciel (Sky Charts).
The naked-eye planets, Comet Pons-Brooks, and the Moon at sunset and sunrise on a single night, starting with sunset on the right tonight, April 11th 2024. The night ends on the left with sunrise tomorrow morning on the 12th. Click or tap on the image to enlarge it. Created using my LookingUp app and GIMP.
Categories: Ephemeris Program, Naked-eye planets, Observing, Planets Tags: , , ,

Ephemeris: 04/03/2024 – Where have the naked-eye planets wandered off to this week?

April 3, 2024 Comments off

This is Ephemeris for Wednesday, April 3rd. Today the Sun will be up for 12 hours and 54 minutes, setting at 8:13, and it will rise tomorrow at 7:17. The Moon, 2 days past last quarter, will rise at 5:33 tomorrow morning.

Let’s find out where the naked-eye planets have wandered off to this week, and see what planets are left. Mercury is now too close to the Sun to be spotted. Bright Jupiter is due west at 8:45 pm or a half hour after sunset. It will set at 11:05 pm. We are getting close to losing Jupiter in the evening sky. Comet 12P/Pons-Brooks is right of and a bit below Jupiter in the evening. Though officially naked-eye brightness, one has to have very good eyes, binoculars or telescope to spot it. In my Wednesday blog posts at bobmoler.wordpress.com I have finder charts. In the morning Mars, and especially Venus and Saturn may be impossible to spot, in the east-southeast in the bright twilight. Mars will rise at 6:10, and will be very low in the east-southeast at 6:45 am.

The astronomical event times given are for the Traverse City/Interlochen area of Michigan (EDT, UT–4 hours). They may be different for your location.

Addendum

Jupiter and Mercury as might be seen at 9:00 PM, or nearly three quarters of an hour after sunset, tonight April 3rd 2024 . Also Comet Pons-Brooks is in the same general area of the sky. It is 5th magnitude, and probably not visible without binoculars or a small telescope. Mercury is definiotely not visible wothout a telescope. Created using Stellarium.
A finder chart for Comet Pons-Brooks for the next week
Here is a finder chart for Comet Pons-Brooks for the next week at 9:30 PM. Jupiter is also in the field. The first position is marked with the name, month and day, and the approximate magnitude. The chart shows a comet tail. The tail will probably not be visible visually, however if it is visible, that is the direction it will be pointing. Created using Cartes du Ciel (Sky Charts).

During the solar eclipse on the 8th, during totality, the comet will be located around the 2nd to the last position of its track. However, unless it is obviously noticeable, totality time is too short to use trying to find it. Enjoy the glory of the sun’s corona for the brief time you have.

The Moon, Mars, and Saturn as they might appear about 6:45 in the morning about 1/2 an hour before sunrise low in the east-southeast to southeast. Mars and Saturn are shown brighter than they might appear, so don’t be discouraged if you can’t see them. Created using Stellarium.
The Moon as seen in a pair binoculars or telescope around 6:45 tomorrow morning April 4th 2024
The moon as seen in a pair binoculars or telescope around 6:45 tomorrow morning April 4th 2024. Selected features are labeled. Montes Jura or the Jura Mountains on the terminator surround 3 sides of the Bay of Rainbows (Sinus Iridium). The crater J. Herschel is named after John Herschel, son of William Herschel, a more famous astronomer, who has a small crater near the center of the disk of the moon just north of crater named for Ptolemy and near another crater named for the Greek astronomer Hipparchus. Created using Stellarium, LibreOffice Draw, and GIMP.
Jupiter as it might appear in a telescope
Jupiter as it might appear in a telescope at 9:30 this evening in this erect image, showing the position of its Galilean moons. Jupiter’s apparent diameter is 33.93″. Created using Cartes du Ciel (Sky Charts).
The naked-eye planets, Comet Pons-Brooks, and the Moon at sunset and sunrise on a single night
The naked-eye planets, Comet Pons-Brooks, and the Moon at sunset and sunrise on a single night, starting with sunset on the right tonight, April 3rd 2024. The night ends on the left with sunrise tomorrow morning on the 4th. Click or tap on the image to enlarge it. Created using my LookingUp app and GIMP.
Categories: Ephemeris Program, Naked-eye planets, Observing, Planets Tags: , , , , , ,

Ephemeris: 03/27/2024 – Let’s find out where the naked-eye planets have wandered off to this week

March 27, 2024 Comments off

This is Ephemeris for Wednesday, March 27th. Today the Sun will be up for 12 hours and 33 minutes, setting at 8:04, and it will rise tomorrow at 7:30. The Moon, 2 days past full, will rise at 10:50 this evening.

Let’s find out where the naked-eye planets have wandered off to this week, and see what planets are left. Mercury is visible in the evening sky shortly after sunset appearing very low in the west. It will be visible for the next few days or so, slowly heading back toward the Sun since this past Sunday. Higher up in the sky is bright Jupiter in the west southwest. It will set at 11:25 pm. Jupiter will be visible in the evening for only about another month or so. In the morning Mars, and especially Venus and Saturn may be impossible to spot, in the east-southeast in the bright twilight. Mars will rise at 6:28, and will be very low in the east-southeast. Comet 12P/Pons-Brooks is below-right of Jupiter in the evening. I’ll have more about it tomorrow.

The astronomical event times given are for the Traverse City/Interlochen area of Michigan (EDT, UT–4 hours). They may be different for your location.

Addendum

upiter and Mercury
Jupiter and Mercury as might be seen at 9:00 PM, or nearly an hour after sunset, tonight March 27th 2024 . Also Comet Pons-Brooks is in the same general area of the sky. It is 5th magnitude almost 6th, and probably not visible without binoculars or a small telescope . Created using Stellarium.
Finder chart for Comet Pons-Brooks
Here is a finder chart for Comet Pons-Brooks for the next week at 9:30 PM. Jupiter is also in the field. The first position is marked with the name, month and day, and the approximate magnitude. The chart shows a comet tail. The tail will probably not be visible visually, however if it is visible, that is the direction it will be pointing. Click or tap on the image to enlarge it. Created using Carts du Ciel (Sky Charts).
The waning gibbous Moon tonight
The waning gibbous Moon tonight at midnight, March 27th 2024, with and without annotations of selected features . Created using Stellarium, LibreOffice Draw, and GIMP.
Mars as seen about 6:50 in the morning
Mars as seen about 6:50 in the morning or about 40 minutes before sunrise, looking east-southeast. It may not look as bright as this. Click or tap on the image to enlarge it. Created using Stellarium.
Jupiter as it might appear in a telescope
Jupiter as it might appear in a telescope at 9:30 this evening in this erect image, showing the position of its Galilean moons. Jupiter’s apparent diameter is 34.3″. Created using Cartes du Ciel (Sky Charts). Labels via Libre Office Draw.
The naked-eye planets, Comet Pons-Brooks, and the Moon at sunset and sunrise on a single night
The naked-eye planets, Comet Pons-Brooks, and the Moon at sunset and sunrise on a single night, starting with sunset on the right tonight, March 27th 2024. The night ends on the left with sunrise tomorrow morning on the 28th. The symbols and labels for Saturn and Venus in the morning overlay each other. Click or tap on the image to enlarge it. Created using my LookingUp app and GIMP.
Categories: Comet, Ephemeris Program, Observing, Planets Tags: , , , , , ,

Ephemeris: 03/20/2024 – Let’s find out where the naked-eye planets have wandered off to this week

March 20, 2024 Comments off

This is Ephemeris for Wednesday, March 20th. Today the Sun will be up for 12 hours and 11 minutes, setting at 7:56, and it will rise tomorrow at 7:43. The Moon, 3 days past first quarter, will set at 6:38 tomorrow morning.

Let’s find out where the naked-eye planets have wandered off to this week, and see what planets are left. Mercury is visible in the evening sky shortly after sunset appearing very low in the west. It will be visible for the next week or so, moving away from the Sun, but getting dimmer, and starting back toward the Sun after Sunday. Higher up in the sky is bright Jupiter in the west southwest. It will set at 11:45 pm. Jupiter will be visible in the evening for only about another month or so. In the morning Mars, Venus and Saturn may be impossible to spot, in the east-southeast in the bright twilight. Mars will rise at 6:43 am, followed by Venus at 7:13, with Saturn right below it.

The astronomical event times given are for the Traverse City/Interlochen area of Michigan (EDT, UT–4 hours). They may be different for your location.

Addendum

Jupiter and Mercury as they might appear in the West at around 45 minutes after sunset.
Jupiter and Mercury as they might appear in the West at around 45 minutes after sunset or about 8:40 PM. Created using Stellarium.
The gibbous Moon as it might be visible this evening in binoculars or a small telescope
The gibbous Moon as it might be visible this evening in binoculars or a small telescope around 9 PM tonight, March 20th, 2024. Selected features are annotated. Created using Stellarium, LibreOffice Draw, and GIMP.
Jupiter and its moons tonight
We are down to one naked eye planet worth looking at in a telescope, and that is Jupiter. This is Jupiter and its moons as they would appear at 9 pm tonight, March 20th 2024. Jupiter and its moons are tilted at an angle as they would appear in the sky due to the angle of the ecliptic to the western horizon. In previous views, where I’ve looked at more than multiple planets at a time, I’ve shown them in relationship to the ecliptic or plane of the Earth’s orbit. Jupiter’s apparent diameter is 34.86 seconds of arc. Created using Stellarium, and LibreOffice Draw for labels.
The naked-eye planets and the Moon at sunset and sunrise on a single night
The naked-eye planets and the Moon at sunset and sunrise on a single night, starting with sunset on the right tonight, March 20th 2024. The night ends on the left with sunrise tomorrow morning on the 21st. The symbols and labels for Saturn and Venus in the morning overlay each other. Click or tap on the image to enlarge it. Created using my LookingUp app and GIMP.
Categories: Ephemeris Program, Naked-eye planets, Observing, Planets Tags: , , , , ,

Ephemeris: 03/13/2024 – Where have the naked-eye planets wandered off to this week?

March 13, 2024 Comments off

This is Ephemeris for Wednesday, March 13th. Today the Sun will be up for 11 hours and 49 minutes, setting at 7:47, and it will rise tomorrow at 7:55. The Moon, 3 days past new, will set at 12:28 tomorrow morning.

Let’s find out where the naked-eye planets have wandered off to this week, and see what planets are left. Mercury is beginning to become visible in the evening sky shortly after sunset appearing very low in the west. It will be visible for the next week or so, moving away from the Sun, but getting dimmer. Higher up in the sky Jupiter and the moon are close together this evening With Jupiter to the left and below the crescent Moon in the west southwest. It will set at 12:08 am. Jupiter will be visible in the evening for only about another month or so. In the morning Mars and Venus may be impossible to spot, in the east-southeast in the bright twilight. Mars will rise at 6:57 am, followed by Venus at 7:21.

The astronomical event times given are for the Traverse City/Interlochen area of Michigan (EDT, UT–4 hours). They may be different for your location.

Addendum

Looking westward at 8:30 pm or about 45 minutes after sunset tonight, March 13, 2024, Mercury is low in the west. Jupiter and the Moon are much higher in the west-southwest. The Moon has been enlarged to better show its phase. Created using Stellarium.
The moon tonight as it may appear tonight, March 13th 2024, in binoculars or a small telescope with selected features labeled. Created using Stellarium, LibreOffice Draw, and GIMP.
We are down to one naked eye planet worth looking at in a telescope, and that is Jupiter. This is Jupiter and its moons as they would appear at 8:30 pm tonight, March 13th 2024. Jupiter and its moons are tilted at an angle as they would appear in the sky due to the angle of the ecliptic to the western horizon. In previous views, where I’ve looked at more than multiple planets at a time, I’ve shown them in relationship to the ecliptic or plane of the Earth’s orbit. Jupiter’s apparent diameter is 35.31 seconds of arc. Created using Stellarium, and LibreOffice Draw for labels.
The naked-eye planets and the Moon at sunset and sunrise on a single night, starting with sunset on the right on March 13, 2024. The night ends on the left with sunrise on the 14th. Click or tap on the image to enlarge it. Created using my LookingUp app and GIMP.
Categories: Ephemeris Program, Naked-eye planets, Observing, Planets Tags: , , , ,

Ephemeris: 03/06/2024 – Where have the naked-eye planets wandered off to this week?

March 6, 2024 Comments off

This is Ephemeris for Wednesday, March 6th. Today the Sun will be up for 11 hours and 27 minutes, setting at 6:37, and it will rise tomorrow at 7:08. The Moon, 3 days past last quarter, will rise at 6:03 tomorrow morning.

Let’s find out where the naked-eye planets have wandered off to this week, and see what planets are left. Saturn, and Mercury are gone, too close to the Sun to be seen. Jupiter will be in the west-southwest at 8 this evening. It will set at 11:25 pm in the west. Jupiter will be visible in the evening for only about another month or so. Venus, the morning star, will rise in the east-southeast at 6:23 am, but its brilliance is diminished by the bright twilight and its low position in the sky. It will be very low in the east-southeast at 6:45 am. Mars might be impossible to spot, being a bit to the right and above Venus. A pair of binoculars, at least, will be needed to spot it. It is about the width of the field of binoculars from Venus.

The astronomical event times given are for the Traverse City/Interlochen area of Michigan (EST, UT –5 hours). They may be different for your location.

Addendum

Jupiter seen with the bright stars of winter in the southwestern sky at 8 pm tonight, March 6th 2024
Jupiter seen with the bright stars of winter in the southwestern sky at 8 pm tonight, March 6th 2024. Currently, it is to the right of the stars of winter. But by the end of this year when it appears again in the evening sky Jupiter will be among the stars of winter, actually to the east of Aldebaran. Click or tap on the image to enlarge it. Created using Stellarium.
Venus, Mars and the Moon as they will be positioned at 6:30 am or about 40 minutes before sunrise. Tomorrow morning March 7th 2024
Venus, Mars and the Moon as they will be positioned at 6:30 am or about 40 minutes before sunrise. Tomorrow morning March 7th 2024. They will probably not be visible from our latitude of 45° north. However, the farther south one is the higher they will appear in the sky and the angle between Venus and the Moon will be steeper. Click or tap on the image to enlarge it. Created using Stellarium.
Jupiter and moons at 8 pm
We are down to one naked eye planet worth looking at in a telescope, and that is Jupiter. This is Jupiter and its moons as they would appear at 8 pm tonight, March 6th 2024. Jupiter and its moons are tilted at an angle as they would appear in the sky due to the angle of the ecliptic to the western horizon. In previous views, where I’ve looked at more than multiple planets at a time, I’ve shown them in relationship to the ecliptic or plane of the Earth’s orbit. Jupiter’s apparent diameter is 35.8 seconds of arc. Created using Cartes du Ciel (Sky Charts).
The naked-eye planets and the Moon at sunset and sunrise on a single night
The naked-eye planets and the Moon at sunset and sunrise on a single night, starting with sunset on the right on March 6, 2024. The night ends on the left with sunrise on the 6th. Click or tap on the image to enlarge it. Created using my LookingUp app and GIMP.
Categories: Ephemeris Program, Naked-eye planets, Observing, Planets Tags: , , ,

Ephemeris: 02/28/2024 – Where have the naked-eye planets wandered off to this week?

February 28, 2024 Comments off

This is Ephemeris for Wednesday, February 28th. Today the Sun will be up for 11 hours and 5 minutes, setting at 6:28, and it will rise tomorrow at 7:21. The Moon, halfway from full to last quarter, will rise at 10:52 this evening.

Let’s find out where the naked-eye planets have wandered off to this week, and see what planets are left to see. Saturn, and Mercury are gone, both actually in conjunction with the Sun today. Jupiter will be in the west-southwest at 8 this evening. It will set at 11:47 pm in the west. Jupiter will be visible in the evening for only about two more months. Venus, the morning star, will rise in the east-southeast at 6:27 am, but its brilliance is diminished by the bright twilight and its low position in the sky. It will be very low in the east-southeast at 7 am. Mars might be impossible to spot, being a bit to the right and above Venus. A pair of binoculars, at least, will be needed to spot it in the morning twilight.

The astronomical event times given are for the Traverse City/Interlochen area of Michigan (EST, UT –5 hours). They may be different for your location.

Addendum

Jupiter and the bright stars of winter as they might appear about 8 pm
Jupiter and the bright stars of winter as they might appear about 8 pm tonight, February 28th 2024. Created using Stellarium.
Annotated waning gibbous Moon
The moon is it might appear tonight at midnight a little over an hour after it rises. Selected features are labeled. Click or tap on the image to enlarge it. Created using Stellarium , LibreOffice Draw, and GIMP.
Venus and Mars as they might appear in a pair of binoculars
Venus and Mars as they might appear in a pair of binoculars low in the southeast at 7 am or a bit before, tomorrow morning, February 29th 2024. The planets are about 3° apart, which works out to be six widths of the moon or maybe half the width of the binocular field of view. Created using Stellarium.
Telescopic Jupiter and Venus
Telescopic Jupiter and Venus (north up) as they would be seen in a small telescope, with the same magnification. At 8 pm EST February 28, 2024, for Jupiter, and 7 am on the 29th for Venus. Apparent diameters: Jupiter 36.53″; and Venus 11.11″, 91.2% illuminated.
Jupiter’s moon Io will pass behind (be occulted by) the planet at 8:17 pm EST. It will reappear at 11:39 pm away from the planet because until then it’ll still be in Jupiter’s shadow.
The ” symbol means seconds of arc (1/3600th of a degree). Created using Cartes du Ciel (Sky Charts) and GIMP.
The naked-eye planets and the Moon at sunset and sunrise on a single night
The naked-eye planets and the Moon at sunset and sunrise on a single night, starting with sunset on the right on February 28, 2024. The night ends on the left with sunrise on February 29th. Saturn is not shown because, at solar conjunction it happens to be below the horizon in both views. Click or tap on the image to enlarge it. Created using my LookingUp app and GIMP.
Categories: Ephemeris Program, Naked-eye planets, Observing, Planets Tags: , , , , ,

Ephemeris: 02/26/2024 – The angle of the rising and setting planets from the Sun vary with the seasons

February 26, 2024 Comments off

This is Bob Moler with Ephemeris for Monday, February 26th. Today the Sun will be up for 10 hours and 59 minutes, setting at 6:25, and it will rise tomorrow at 7:24. The Moon, 2 days past full, will rise at 8:44 this evening.

In late winter and early spring dark skies return within a few days after the full Moon. Indeed, this is the first day after the full moon, which was on Saturday morning, that we have dark skies. Well for 40 minutes before the Moon rises. This is because the ecliptic which is the Sun’s path in the sky is as close to vertical as it can get for us. It shows planets near the Sun and the area of the full moon as steeply inclined to the horizon as possible. Twelve years ago this month when my wife and I were on a Hawaiian cruise, I was aboard ship looking at the sky after sunset and was amazed to see Jupiter and Venus* vertically aligned in the west. It was because we were located around the Tropic of Cancer and near the equinox, so the ecliptic was actually vertical after sunset. It was quite a jolt to see that. So this time of year we can see planets close to the sun at sunset and the moon to go away after full rapidly.

The astronomical event times given are for the Traverse City/Interlochen area of Michigan (EST, UT –5 hours). They may be different for your location.

* On the broadcast I said Jupiter and Saturn, relying on my memory. As can be seen below, it was Jupiter and Venus.

Addendum

Looking West after sunset
This view is looking West after sunset when the Sun is approximately 10° below the horizon. For us, it’s about 7:17 pm, or about 52 minutes after sunset. The orange line intersecting the horizon near the western compass point is the ecliptic, the apparent path of the Sun in the sky over the year. It is also the plane of the Earth’s orbit. The solar system is essentially flat, so this is also near where all the planets can be found. On late winter and early spring evenings the ecliptic intercepts the western horizon at a very high angle so we can see planets relatively close to the Sun. This evening Jupiter is at an angle of 63° from the Sun. However, the situation is different in the morning. Created using Stellarium.
Looking east-southeast before sunrise
Tomorrow morning at 6:32 am, again the Sun is 10° below the horizon at 52 minutes before sunrise. The angle of the ecliptic is much lower to the horizon than it is in the evening. That’s why Venus, whose angular distance from the Sun of 25°, a bit less than half Jupiter’s angular distance from the Sun, is just rising. Created using Stellarium.
Venus and Jupiter arranged vertically after sunset as they were seen in Hawaii back in 2012
Venus and Jupiter arranged vertically after sunset as they were seen in Hawaii back in 2012, 12 years ago this month. Since Jupiter’s orbit of the Sun is around 12 years, Jupiter was in the same position it is now. The vertical arrangement of these planets reminded me of one of the views in 2001 a Space Odyssey where the moons of Jupiter were arranged vertically over the planet. Created using Stellarium.
Categories: Concepts, Ephemeris Program, Observing, Planets Tags: , , ,

Ephemeris: 02/21/2024 – Where have the naked-eye planets wandered off to this week?

February 21, 2024 Comments off

This is Ephemeris for Wednesday, February 21st. Today the Sun will be up for 10 hours and 44 minutes, setting at 6:19, and it will rise tomorrow at 7:32. The Moon, 3 days before full, will set at 7:09 tomorrow morning.

Let’s find out where the naked-eye planets have wandered off to this week, and see what planets are left. Saturn, and Mercury are gone, being too close to the Sun to be visible. Jupiter will be in the west-southwest at 8 this evening. It will set at 12:11 am in the west. Jupiter will be visible in the evening for only about two more months. Venus, the morning star, will rise in the east-southeast at 6:33 am, but its brilliance is diminished by the bright twilight and its low position in the sky. It will be very low in the southeast at 7 am. This might be our first chance to spot Mars in the morning sky because tomorrow morning it will be just below Venus by about 1 1/2 moon diameters. A pair of binoculars may be needed to spot it.

The astronomical event times given are for the Traverse City/Interlochen area of Michigan (EST, UT –5 hours). They may be different for your location.

Addendum

Jupiter, the Moon and the bright stars of winter as they might appear about 8:00 pm tonight
Jupiter, the Moon and the bright stars of winter as they might appear about 8:00 pm tonight, February 21st 2024. Created using Stellarium.
The moon is it might appear at 8:00 pm tonight
The moon is it might appear at 8:00 pm tonight February 21st 2024. Selected features are labeled. Created using Stellarium, LibreOffice Draw, and GIMP.
Venus and Mars as they might appear in a pair of binoculars low in the southeast at about 7 a
Venus and Mars as they might appear in a pair of binoculars low in the southeast at about 7 am, or about a half hour before sunrise, tomorrow morning, February 22nd 2024. The planets are about the width of the Moon apart and Mars will be very difficult to spot. In fact both will be very low in the sky and any amount of obscured horizon may prevent them from being visible. Created using Stellarium.
Telescopic Jupiter and Venus
(north up) as they would be seen in a small telescope, with the same magnification. At 8 pm EST February 21, 2024, for Jupiter, and 7 am on the 22nd, for Venus. Apparent diameters: Jupiter 37.23″; and Venus 11.35″, 99.0% illuminated.
Jupiter’s missing moon is Io, which is behind the planet. It will reappear at 9:43 pm away from the planet because until then it’ll still be in Jupiter’s shadow. At 10:02 pm Europa will begin to transit across the face of the planet.
The ” symbol means seconds of arc (1/3600th of a degree). Created using Cartes du Ciel (Sky Charts) and GIMP.
The naked-eye planets and the Moon at sunset and sunrise on a single night
The naked-eye planets and the Moon at sunset and sunrise on a single night, starting with sunset on the right on February 21, 2024. The night ends on the left with sunrise on February 22nd. The label for Mars overlays the image of Venus. Click or tap on the image to enlarge it. Created using my LookingUp app and GIMP.
Categories: Ephemeris Program, Naked-eye planets, Observing, Planets Tags: , , , , ,