Archive
06/12/2019 – Ephemeris – Let’s look at the bright planets for this week
Ephemeris for Wednesday, June 12th. Today the Sun will be up for 15 hours and 31 minutes, setting at 9:28, and it will rise tomorrow at 5:56. The Moon, 2 days past first quarter, will set at 3:53 tomorrow morning.
Let’s look at the bright planets for this week. Mars and Mercury will be low in the west-northwestern sky under the stars Castor and Pollux, which are nearly horizontally arraigned this evening. Mercury is 5 times brighter than Mars, which is a bit above and left of it. Mercury will set at 11:11 p.m. with Mars setting shortly after. Jupiter will start the evening low in the southeast. It far brighter than any star and will be visible all night, setting shortly before sunrise. It’s in Ophiuchus. In the morning sky we have Saturn which will rise at 11:06 p.m., in the east-southeast. It’s in Sagittarius. Both Jupiter and Saturn are easily visible in the predawn skies for very early risers. Venus is too close to the Sun to be seen.
The times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.
Addendum

The Moon and the evening planets at 10:30 p.m. June 12, 2019. Click on the image to enlarge. Created using Stellarium.

The gibbous Moon as it might appear in binoculars or a small telescope tonight at 10:30 p.m. June 12, 2019. Created using Stellarium.

Jupiter and Saturn at 4:30 a.m. June 13, 2019. Click on the image to enlarge. Created using Stellarium.
06/11/2019 – Ephemeris – The crater Copernicus on the Moon
Ephemeris for Tuesday, June 11th. Today the Sun will be up for 15 hours and 31 minutes, setting at 9:28, and it will rise tomorrow at 5:56. The Moon, 1 day past first quarter, will set at 3:26 tomorrow morning.
Tonight, visible on the waxing gibbous Moon in binoculars or a small telescope the terminator, the sunrise line crosses the prominent crater Copernicus. This crater is nearly half way from the top to the bottom of the Moon. It is 56 miles (93 km) in diameter and 2 miles (3.5 k m) deep. The low Sun angle accentuates the depth of the crater. As large craters goes, Copernicus is rather new, being somewhat younger than 1.1 billion years old, a quarter of the Moon’s age. A dramatic image taken by the Lunar Orbiter spacecraft in 1966, in preparation for the Apollo lunar landings of an oblique view of the crater peeking over a crater wall was, at that time, dubbed the Picture of the Century”.
The times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.
Addendum
06/14/2019 – Ephemeris – Jupiter at opposition
Ephemeris for Monday, June 10th. Today the Sun will be up for 15 hours and 30 minutes, setting at 9:27, and it will rise tomorrow at 5:56. The Moon, at first quarter today, will set at 2:59 tomorrow morning.
The planet Jupiter now rises around sunset. Today at 11:11 a.m. it will be officially in opposition from the Sun. This isn’t some conflict, but the simple fact that Jupiter will be opposite the Sun in our sky. It then becomes an evening planet and for this summer will become a dazzling fixture in our evening sky. Jupiter is the second brightest planet after Venus, which is now in the morning Sun’s twilight glare. Watch for it in Wednesday’s planet report. Though the second brightest planet Jupiter by far is the largest planet and an easy planet to view in a small telescope. It’s mass exceeds the combined masses of all the other planets times two. Currently NASA’s Juno spacecraft is orbiting it.
The times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.
Addendum
Jupiter is the largest planet. Its average distance from the Sun is 5.2 astronomical units (AU) from the Sun or 5.2 times the Earth’s distance from the Sun. Here is how its size changes from conjunction with the Sun to opposition.

The apparent size difference between Jupiter at conjunction and at opposition as seen in a telescope. The Jupiter at opposition is its appearance tonight. Click on the image to enlarge. Created using Cartes du Ciel (Sky Charts).
06/07/2019 – Ephemeris – My presentation and viewing opportunities this weekend
Ephemeris for Friday, June 7th. Today the Sun will be up for 15 hours and 27 minutes, setting at 9:25, and it will rise tomorrow at 5:57. The Moon, 3 days before first quarter, will set at 1:23 tomorrow morning.
I will be giving a presentation Apollo and the race to the Moon tonight at this evening’s meeting of the Grand Traverse Astronomical Society at 8 p.m. at Northwestern Michigan College’s Rogers Observatory. The 1960’s were a heady time in the undeclared race with the Soviet Union for supremacy in space, where it seemed that the US was continually playing catch up. In 1968 spy satellites showed that the Soviets had a massive rocket ready to go. After the meeting there will be a star party starting at 9 p.m.
Tomorrow there will be weather permitting a Sun and Star Party at the Sleeping Bear Dunes Dune Climb from 4 to 6 p.m. and 9 to 11 p.m. Both nights feature the Moon and Jupiter.
The times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.
Addendum
06/06/2019 – Ephemeris – The 75th anniversary of D-Day, the astronomical connection
Ephemeris for Thursday, June 6th. Today the Sun will be up for 15 hours and 26 minutes, setting at 9:25, and it will rise tomorrow at 5:57. The Moon, 3 days past new, will set at 12:40 tomorrow morning.
Today is the 75th anniversary of the greatest battle of World War II was the invasion of Normandy on D-Day, a date governed by the position of the Moon. The full moon on June the 6th, 1944 gave light for the gliders and paratroopers to carry out their operations at midnight. Plus the high tides were near noon and midnight and the low tides near dawn. The idea was to hit the beach at low tide to enable the landing craft to operate without hitting the obstacles the Germans planted in the tidal zone. It was great for the landing craft, but the troops had a lot of open beach to cover to get to some sort of shelter. The best days for the invasion were the 5th, 6th and 7th of June. Bad weather on the 5th caused a one day postponement.
The times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.
06/05/2019 – Ephemeris – Where are the bright planets for this week?
Ephemeris for Wednesday, June 5th. Today the Sun will be up for 15 hours and 25 minutes, setting at 9:24, and it will rise tomorrow at 5:58. The Moon, 2 days past new, will set at 11:49 this evening.
Let’s look at the bright planets for this week. Mars will be low in the west-northwestern sky this evening, below and right of the crescent Moon. It will set at 11:33 p.m. In the morning sky we have Jupiter, in Ophiuchus, which will actually rise at 9:35 tonight in the east-southeast. Jupiter will reach opposition from the Sun next Monday and thereafter rise before sunset and officially become an evening planet. Saturn will be next to rise at 11:39 p.m., also in the east-southeast. It’s in Sagittarius. Both planets are easily visible in as morning twilight grows. Mercury will become visible in the evening sky below Mars in a few days. It’s greatest separation from the Sun will be on the 23rd. Venus, is too close to the Sun to be seen.
The times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.
Addendum

Mars, the Moon, and Jupiter tonight at 10:30 p.m. June 5, 2019. Click on the image to enlarge. Created using Stellarium.

The Moon as it might appear in binoculars or a small telescope tonight at 10:30 p.m. June 5, 2019. Created using Stellarium.
06/04/2019 – Ephemeris – The night sky previews summer
Ephemeris for Tuesday, June 4th. Today the Sun will be up for 15 hours and 24 minutes, setting at 9:23, and it will rise tomorrow at 5:58. The Moon, 1 day past new, will set at 10:51 this evening.
The Moon will be visible early this evening. By early I mean by 10 p.m. since the Sun sets so late now. By the time you see it it will be a day and a half old and a thin sliver. Closer inspection will reveal the the whole Moon will be visible due to Earth shine. That’s due to the nearly full Earth shining on the night side of the Moon.
Even though Summer is 17 days away the three bright stars of the Summer Triangle are visible in the eastern sky at 11 p.m. The three stars are Vega highest in the east. Deneb is lower in the northeast. Altair is lower close to the horizon in east. They will rise higher throughout the summer season. Looking close to the horizon in the southeast that bright star at that hour is the planet Jupiter.
The times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.
Addendum
06/03/2019 – Ephemeris – We’re starting Ephemeris’ 45th journey around the Sun
Ephemeris for Monday, June 3rd. Today the Sun will be up for 15 hours and 23 minutes, setting at 9:22, and it will rise tomorrow at 5:59. The Moon is new today, and won’t be visible.
With this program Ephemeris begins its 45th journey around the Sun. While this short program mostly covers the wonders visible in the heavens with the naked eye, binoculars or small telescope, as last week has shown we also cover news developments, hopefully whetting your appetite to dig deeper. Over the last 44 years we’ve seen the rise and demise of the Space Shuttle program, the fantastic images and data brought back by the Hubble Space Telescope, the planetary probes Viking, Voyager, Galileo, Cassini, MESSENGER, New Horizons, Rosetta, Dawn and others to visit all the planets in the solar system plus asteroids, dwarf planets, and comets. Discoveries beyond the solar system boggle the mind. Let’s go for another orbit around the Sun on spaceship Earth.
The times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.
05/31/2019 – Ephemeris – Previewing June skies
Ephemeris for Friday, May 31st. Today the Sun will be up for 15 hours and 19 minutes, setting at 9:20, and it will rise tomorrow at 6:00. The Moon, 3 days before new, will rise at 5:13 tomorrow morning.
Let’s preview the skies of June. There’ will be a lot of Sun in June and very little night. The daylight hours will increase a bit from 15 hours and 20 minutes tomorrow to 15 hours and 34 minutes on the 21st, retreating back to 15 hours 31 minutes at month’s end. At this time of the year the sunset times for Ludington, Interlochen, Petoskey and Mackinaw City are very nearly the same. However the sunrise times are at their most divergent. With Ludington’s sunrise being 14 minutes later than Mackinaw City’s. The altitude of the sun above the southern horizon at local noon around 1:43 p.m. will hover around 68 to 69 degrees. Summer will start on the 21st at 11:54 a.m. The planet Mercury will grace our evening skies this month.
The times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.
Addendum
June Evening Star Chart

Star Chart for June 2019 (11 p.m. EDT June 15, 2019). Created using my LookingUp program. Click on image to enlarge.
The planets and stars are plotted for the 15th at 11 p.m. EDT in the evening and 4 a.m. for the morning chart. These are the chart times. Note that Traverse City is located approximately 45 minutes behind our time meridian, West 75° longitude. (An hour 45 minutes behind our daylight saving time meridian during EDT). To duplicate the star positions on a planisphere you may have to set it to 1 hour 45 minutes earlier than the current time.
Note the chart times of 10 p.m. and 5 a.m. are for the 15th. For each week before the 15th add ½ hour (28 minutes if you’re picky). For each week after the 15th subtract ½ hour. The planet positions are updated each Wednesday on this blog. For planet positions on dates other than the 15th, check the Wednesday planet posts on this blog.
June Morning Star Chart

Star Chart for June mornings 2019 (4 a.m. EDT June 15, 2019). Created using my LookingUp program. Click on image to enlarge.
For a list of constellation names to go with the abbreviations click here.
- Pointer stars at the front of the bowl of the Big Dipper point to Polaris the North Star.
- Leaky dipper drips on Leo.
- Follow the arc of the handle of the Big Dipper to the star Arcturus, and
- Extend like a spike to Spica.
- The Summer Triangle is in red.
Twilight Limits, Nautical and Astronomical
| EDT | |||||||
| Traverse City |
Morning twilight | Evening twilight | Dark night | Moon | |||
| Date | Astro. | Nautical | Nautical | Astro. | Start | End | Illum. |
| 2019-06-01 | 3h43m | 4h42m | 22h46m | 23h45m | 23h45m | 3h43m | 0.04 |
| 2019-06-02 | 3h42m | 4h41m | 22h47m | 23h47m | 23h47m | 3h42m | 0.01 |
| 2019-06-03 | 3h41m | 4h40m | 22h49m | 23h48m | 23h48m | 3h41m | 0 |
| 2019-06-04 | 3h39m | 4h40m | 22h50m | 23h50m | 23h50m | 3h39m | 0.02 |
| 2019-06-05 | 3h38m | 4h39m | 22h51m | 23h51m | 23h51m | 3h38m | 0.07 |
| 2019-06-06 | 3h37m | 4h38m | 22h52m | 23h53m | – | 3h37m | 0.15 |
| 2019-06-07 | 3h36m | 4h38m | 22h53m | 23h54m | 0h41m | 3h36m | 0.24 |
| 2019-06-08 | 3h35m | 4h37m | 22h53m | 23h55m | 1h23m | 3h35m | 0.35 |
| 2019-06-09 | 3h34m | 4h37m | 22h54m | 23h57m | 1h59m | 3h34m | 0.47 |
| 2019-06-10 | 3h34m | 4h36m | 22h55m | 23h58m | 2h31m | 3h34m | 0.59 |
| 2019-06-11 | 3h33m | 4h36m | 22h56m | 23h59m | 2h59m | 3h33m | 0.7 |
| 2019-06-12 | 3h32m | 4h36m | 22h57m | 0h00m | 3h26m | 3h32m | 0.8 |
| 2019-06-13 | 3h32m | 4h36m | 22h57m | 0h01m | – | – | 0.88 |
| 2019-06-14 | 3h32m | 4h35m | 22h58m | 0h02m | – | – | 0.95 |
| 2019-06-15 | 3h31m | 4h35m | 22h58m | 0h02m | – | – | 0.95 |
| 2019-06-16 | 3h31m | 4h35m | 22h59m | 0h03m | – | – | 0.98 |
| 2019-06-17 | 3h31m | 4h35m | 22h59m | 0h04m | – | – | 1 |
| 2019-06-18 | 3h31m | 4h35m | 23h00m | 0h04m | – | – | 0.99 |
| 2019-06-19 | 3h31m | 4h35m | 23h00m | 0h05m | – | – | 0.96 |
| 2019-06-20 | 3h31m | 4h35m | 23h00m | 0h05m | – | – | 0.91 |
| 2019-06-21 | 3h31m | 4h36m | 23h01m | 0h05m | 0h05m | 0h12m | 0.85 |
| 2019-06-22 | 3h31m | 4h36m | 23h01m | 0h05m | 0h05m | 0h44m | 0.77 |
| 2019-06-23 | 3h32m | 4h36m | 23h01m | 0h06m | 0h06m | 1h12m | 0.68 |
| 2019-06-24 | 3h32m | 4h36m | 23h01m | 0h06m | 0h06m | 1h37m | 0.59 |
| 2019-06-25 | 3h32m | 4h37m | 23h01m | 0h05m | 0h05m | 2h01m | 0.49 |
| 2019-06-26 | 3h33m | 4h37m | 23h01m | 0h05m | 0h05m | 2h23m | 0.39 |
| 2019-06-27 | 3h34m | 4h38m | 23h01m | 0h05m | 0h05m | 2h47m | 0.3 |
| 2019-06-28 | 3h35m | 4h38m | 23h01m | 0h05m | 0h05m | 3h13m | 0.21 |
| 2019-06-29 | 3h35m | 4h39m | 23h01m | 0h04m | 0h04m | 3h35m | 0.12 |
| 2019-06-30 | 3h36m | 4h40m | 23h00m | 0h04m | 0h04m | 3h36m | 0.06 |
Twilight calendar was generated using Cartes du Ciel (Sky Charts).
See my blog post: Twilight Zone for the definitions of the different periods of twilight here: https://bobmoler.wordpress.com/2018/09/27/.
NASA Calendar of Planetary Events
Date Time Event
Jun 1 Sa Venus: 20° W
1 Sa 2:15 pm Moon-Venus: 3.4° N
3 Mo 6:02 am New Moon
5 We 8:58 am Moon North Dec.: 22.4° N
5 We 11:05 am Moon-Mars: 1.6° N
5 We 6:46 pm Moon Ascending Node
7 Fr 3:19 am Moon-Beehive: 0.2° S
7 Fr 7:21 pm Moon Perigee: 368500 km
8 Sa 9:54 pm Venus-Pleiades: 5.1° S
10 Mo 1:59 am First Quarter
10 Mo 11:11 am Jupiter Opposition
16 Su 2:50 pm Moon-Jupiter: 2.1° S
16 Su 7:09 pm Venus-Aldebaran: 4.7° N
17 Mo 4:31 am Full Moon
18 Tu 11:33 am Moon South Dec.: 22.4° S
18 Tu 1:41 pm Mercury-Mars: 0.2° N
18 Tu 9:49 pm Moon Descending Node
18 Tu 11:58 pm Moon-Saturn: 0.5° N
19 We 9:06 am Mercury-Pollux: 5.4° S
21 Fr 3:56 am Mars-Pollux: 5.5° S
21 Fr 11:54 am Summer Solstice
23 Su 3:50 am Moon Apogee: 404500 km
23 Su 6:59 pm Mercury Greatest Elongation: 25.2° E
25 Tu 5:46 am Last Quarter
30 Su 11:06 am Moon-Aldebaran: 2.3° S
Jul 1 Mo Venus: 12° W
All event times are given for UTC-4 hr: Eastern Daylight Saving Time.
Sky Events Calendar by Fred Espenak and Sumit Dutta (NASA’s GSFC),
http://eclipse.gsfc.nasa.gov/SKYCAL/SKYCAL.html.
If you go to the above site you can print out a list like the above for the entire year or calendar pages for your time zone.
Sun and Moon Rising and Setting Events
LU Ephemeris of Sky Events for Interlochen/TC
June, 2019 Local time zone: EDT
+-----------------------------------------------------------------------+
| DATE | SUN SUN DAYLIGHT| TWILIGHT* |MOON RISE OR ILLUM |
| | RISE SET HOURS | END START |PHASE SET** TIME FRACTN|
+=======================================================================+
|Sat 1| 06:00a 09:21p 15:20 | 10:44p 04:37a | Rise 05:45a 3%|
+------+-----------------------+----------------+-----------------------+
|Sun 2| 05:59a 09:22p 15:22 | 10:45p 04:36a | Rise 06:22a 0%|
|Mon 3| 05:59a 09:22p 15:23 | 10:46p 04:35a |New Set 09:45p 0%|
|Tue 4| 05:59a 09:23p 15:24 | 10:47p 04:35a | Set 10:51p 3%|
|Wed 5| 05:58a 09:24p 15:25 | 10:48p 04:34a | Set 11:49p 8%|
|Thu 6| 05:58a 09:25p 15:26 | 10:49p 04:33a | Set 12:40a 16%|
|Fri 7| 05:57a 09:25p 15:27 | 10:50p 04:33a | Set 01:23a 25%|
|Sat 8| 05:57a 09:26p 15:28 | 10:51p 04:32a | Set 01:59a 36%|
+------+-----------------------+----------------+-----------------------+
|Sun 9| 05:57a 09:27p 15:29 | 10:52p 04:32a | Set 02:30a 47%|
|Mon 10| 05:57a 09:27p 15:30 | 10:53p 04:31a |F Qtr Set 02:59a 59%|
|Tue 11| 05:56a 09:28p 15:31 | 10:53p 04:31a | Set 03:26a 69%|
|Wed 12| 05:56a 09:28p 15:31 | 10:54p 04:31a | Set 03:53a 79%|
|Thu 13| 05:56a 09:29p 15:32 | 10:55p 04:30a | Set 04:23a 87%|
|Fri 14| 05:56a 09:29p 15:33 | 10:55p 04:30a | Set 04:55a 94%|
|Sat 15| 05:56a 09:30p 15:33 | 10:56p 04:30a | Set 05:32a 98%|
+------+-----------------------+----------------+-----------------------+
|Sun 16| 05:56a 09:30p 15:33 | 10:56p 04:30a | Set 06:14a 100%|
|Mon 17| 05:56a 09:30p 15:34 | 10:57p 04:30a |Full Rise 09:56p 100%|
|Tue 18| 05:56a 09:31p 15:34 | 10:57p 04:30a | Rise 10:49p 97%|
|Wed 19| 05:56a 09:31p 15:34 | 10:57p 04:30a | Rise 11:34p 93%|
|Thu 20| 05:56a 09:31p 15:34 | 10:58p 04:30a | Rise 12:12a 87%|
|Fri 21| 05:57a 09:32p 15:34 | 10:58p 04:30a | Rise 12:44a 80%|
|Sat 22| 05:57a 09:32p 15:34 | 10:58p 04:31a | Rise 01:12a 72%|
+------+-----------------------+----------------+-----------------------+
|Sun 23| 05:57a 09:32p 15:34 | 10:58p 04:31a | Rise 01:37a 63%|
|Mon 24| 05:57a 09:32p 15:34 | 10:58p 04:31a | Rise 02:00a 54%|
|Tue 25| 05:58a 09:32p 15:34 | 10:58p 04:32a |L Qtr Rise 02:23a 44%|
|Wed 26| 05:58a 09:32p 15:33 | 10:58p 04:32a | Rise 02:47a 35%|
|Thu 27| 05:59a 09:32p 15:33 | 10:58p 04:32a | Rise 03:13a 26%|
|Fri 28| 05:59a 09:32p 15:33 | 10:58p 04:33a | Rise 03:42a 17%|
|Sat 29| 05:59a 09:32p 15:32 | 10:58p 04:34a | Rise 04:16a 10%|
+------+-----------------------+----------------+-----------------------+
|Sun 30| 06:00a 09:32p 15:31 | 10:57p 04:34a | Rise 04:58a 4%|
+-----------------------------------------------------------------------+
* Nautical Twilight
** Moonrise or moonset, whichever occurs between sunrise and sunset
05/30/2019 – Ephemeris – Is the Beta Taurid meteor swarm hiding bigger space rocks?
Ephemeris for Thursday, May 30th. Today the Sun will be up for 15 hours and 17 minutes, setting at 9:19, and it will rise tomorrow at 6:01. The Moon, half way from last quarter to new, will rise at 4:46 tomorrow morning.
A rather interesting piece of news popped up in astronomical circles last Friday. A paper accepted for publication by David Clark, Paul Wiegert and Peter Brown all of the University of Western Ontario, Canada talked about the prospects of observing the meteoroid swarm out in space that may have contained the famous Tunguska object that hit Siberia in 1908. The swarm has been shed by Encke’s Comet over time. The Earth is due to pass close to the center of the swarm this year in June, something that last happened in 1975. They cause the daytime outbound Beta Taurid shower in June and July and the inbound North and South Taurid showers in autumn.
The times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.
The times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.
Addendum
Links:
Bad Astronomy’s take on all this: https://www.syfy.com/syfywire/could-larger-space-rocks-be-hiding-in-the-beta-taurid-meteor-stream-we-may-find-out-this
The original paper: https://arxiv.org/pdf/1905.01260.pdf
The article at Spaceweathe.com: https://spaceweatherarchive.com/2019/05/24/close-encounters-with-the-taurid-swarm/











