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/
05/29/2019 – Ephemeris – Looking at the bright planets tonight
Ephemeris for Wednesday, May 29th. Today the Sun will be up for 15 hours and 16 minutes, setting at 9:18, and it will rise tomorrow at 6:01. The Moon, 3 days past last quarter, will rise at 4:21 tomorrow morning.
Let’s look at the planets for this week. Mars will be low in the west-northwestern sky this evening, in Gemini crawling up Castor’s leg. It will set at 11:42 p.m. In the morning sky we have Jupiter, in Ophiuchus, which will actually rise at 10:02 tonight in the east-southeast. Jupiter won’t be considered an evening planet until it rises before sunset, which will occur after June 10th. Saturn will be next to rise at 12:11 a.m., also in the east-southeast. It’s in Sagittarius. Both planets are easily visible in as morning twilight grows. Venus will rise 53 minutes before the Sun in the east northeast. It will remain in our morning sky, though too close to the rising Sun to be easily glimpsed. In August it will pass behind the Sun to enter the evening sky.
The times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.
Addendum

Mars in the evening in Gemini tonight at 10:30 p.m. May 29, 2019. Click on the image to enlarge. Created using Stellarium.

The Moon, enlarged 3 times, is only 6 degrees above the eastern horizon at 5 a.m. on May 30, 2019. The inset is the binocular view. Created using Stellarium.
05/28/2019 – Ephemeris – A new satellite phenomenon was visible last Saturday night.
Ephemeris for Tuesday, May 28th. Today the Sun will be up for 15 hours and 14 minutes, setting at 9:17, and it will rise tomorrow at 6:02. The Moon, 2 days past last quarter, will rise at 3:57 tomorrow morning.
Last Saturday night at the star party at the Sleeping Bear Dunes National Lake shore we saw an amazing sight. After 10 p.m. we saw a ghostly line in the sky. It looked like a jet contrail at first, but there was no jet making it, and besides at that altitude the Sun wouldn’t be shining on it. It reminded me of the tail of Comet Hale-Bopp that graced our skies 22 years ago, But the ghostly line was moving to the northward. It dawned on us that these were the 60 Starlink satellites SpaceX launched two days before. It was the first 60 of a planned 12,000 satellites that will launch in Elon Musk’s Internet satellite venture. The satellites, each too faint to be seen with the naked eye will soon spread out along their orbit.
The times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.
Addendum

The train of Starlink satellites the night after launch from the Netherlands by Marco Langbroek from his video on EarthSky.com.
I went out during the writing of this week’s Ephemeris programs at 11:45 p.m. and saw three of them. This time they went almost overhead. There were three satellites close together in line. According to Heavens-Above the train is really getting spread out, so I may have been seeing only some of them. I didn’t see any fainter ones in between. Overhead the three were quite bright.
Links:
An article about the Starlink satellite train: https://earthsky.org/space/wow-photo-video-spacex-starlink-satellite-train
Here’s a place (Heavens Above) to get predictions of the passage of the satellite train for your location: https://heavens-above.com/main.aspx. They also have predictions for the International Space Station.
Scott Manley’s YouTube video – Will Starlink & Other Satellite Networks Ruin The Night Sky For Astronomers?: https://www.youtube.com/watch?v=GEuMFJSZmpc
YouTube video of the Starlink launch: https://www.youtube.com/watch?time_continue=3&v=riBaVeDTEWI
05/27/2019 – Ephemeris – The bright star Spica
Ephemeris for Memorial Day, Monday, May 27th. Today the Sun will be up for 15 hours and 13 minutes, setting at 9:16, and it will rise tomorrow at 6:03. The Moon, 1 day past last quarter, will rise at 3:34 tomorrow morning.
Just about due south at 10:30 p.m. is the bright star Spica which can be found from all the way back overhead to the Big Dipper. Follow the arc of the handle of the Big Dipper to the bright star Arcturus high in the south-southeast. Then straighten the curve of the arc to a straight spike which points to Spica the brightest star in the zodiacal constellation of Virgo the virgin. Arcturus is much brighter than Spica and has an orange tint to Spica’s bluish hue. In fact Spica is the bluest of the 21 first magnitude stars. That means that it is hot. Actually Spica is really two blue stars orbiting each other every 4 days. Spica is 250 light years away, which is reasonably close. Spica was an important star to the ancient Greeks. One temple was built, and aligned to its setting point.
The times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.
Addendum
05/24/2019 – Ephemeris – Star party at the Sleeping Bear Dunes National Lake Shore tomorrow night
Ephemeris for Friday, May 24th. Today the Sun will be up for 15 hours and 7 minutes, setting at 9:13, and it will rise tomorrow at 6:05. The Moon, 2 days before last quarter, will rise at 2:13 tomorrow morning.
Tomorrow evening the Grand Traverse Astronomical Society will be at the Sleeping Bear Dunes National Lakeshore for observations of the heavens in what we call a star party. The location on Saturday will be the Dune Climb. Hazy or partly cloudy skies are acceptable. The night will start at 9 p.m. with an introduction by the rangers and a twilight talk by a member of the society of what will be visible and why the Sun sets so late now. As the stars appear in the twilight telescopes will be pointed to them to see their colors and what they mean. By 10:30 the constellations will be visible enough to view the wonders they contain and the ancient stories they represent.
The times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.
Addendum
05/23/2019 – Ephemeris – A look at the constellation of Corona Borealis
Ephemeris for Thursday, May 23rd. Today the Sun will be up for 15 hours and 5 minutes, setting at 9:12, and it will rise tomorrow at 6:06. The Moon, 3 days before last quarter, will rise at 1:37 tomorrow morning.
High in the east-southeast at 11 this evening can be seen a small nearly circular constellation of Corona Borealis, the Northern Crown. It is just below Boötes, the kite shaped constellation off the handle of the Big Dipper. According to Greek myth the crown was given by the gods to the princess Ariadne, daughter of King Minos of Crete. The crown is more like a tiara with the bright star Alphecca at the front. To the Anishinaabe people, who are natives of our region it is the Sweat Lodge. Part of what we call Hercules next to it is the Exhausted Bather, who is lying on the ground after the ceremony. The seven stones that are heated for the Sweat Lodge are the Pleiades, now 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
05/22/2019 – Ephemeris – Where are the bright planets for this week
Ephemeris for Wednesday, May 22nd. Today the Sun will be up for 15 hours and 3 minutes, setting at 9:11, and it will rise tomorrow at 6:06. The Moon, half way from full to last quarter, will rise at 12:56 tomorrow morning.
Let’s look at the planets for this week. Mars will be low in the west-northwestern sky this evening, entering Gemini near Castor’s foot. It will set at 11:52 p.m. In the morning sky we have Jupiter, in Ophiuchus, which will actually rise at 10:38 tonight in the east-southeast. Jupiter won’t be considered an evening planet until it rises before sunset, which will occur after June 10th. Saturn will be next to rise at 12:40 a.m., also in the east-southeast. It’s in Sagittarius. Both planets are easily visible in as morning twilight grows. Venus will rise 53 minutes before the Sun in the east northeast. It will remain in our morning sky, though too close to the rising Sun to be easily glimpsed. In August it will pass behind the Sun to enter the evening sky.
The times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.
Addendum

Mars and the setting winter stars tonight at 10 p.m. May 22, 2019. Click on the image to enlarge. Created using Stellarium.

Jupiter, Saturn and the Moon at 5 a.m. May23, 2019. Click on the image to enlarge. Created using Stellarium.










