Archive for the ‘Uncategorized’ Category

11/22/2017 – Ephemeris – A look at the bright planets for Thanksgiving week

November 22, 2017 Comments off

Ephemeris for Wednesday, November 22nd. The Sun will rise at 7:48. It’ll be up for 9 hours and 19 minutes, setting at 5:08. The Moon, half way from new to first quarter, will set at 8:39 this evening.

Let’s take our weekly look at the bright planets. Mercury is briefly visible in binoculars in the southwest in the evening, setting at 6:11 p.m., and will reach it’s greatest elongation from the Sun tomorrow evening. Saturn is sinking low in the southwestern sky. Saturn’s rings are still spectacular in telescopes, but since Saturn is so low in the sky the thick atmosphere makes Saturn fuzzy and seemingly to go in and out of focus. Saturn will set at 6:49 p.m. Tomorrow in the morning sky, Mars, heading away from the Sun will rise in the east at 4:11 a.m., Jupiter, also moving away from the Sun, will rise at in the east-southeast at 5:54 a.m., leaving Venus behind after their conjunction 9 days ago, which will rise at 6:47 a.m..

The times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.


Evening Planets

Mercury, Saturn and the Moon at 5:45 p.m., a bit more than a half hour after sunset, November 22, 2017. Click on the image to enlarge. Created using Stellarium.

Telescopic Saturn_1800-112217

Saturn as it might be seen in a telescope tonight. Created using Cartes du Ciel (Star Charts).

Binocular Moon_1845-112217

The Moon as it might be seen tonight.  Created using Stellarium.

Morning Planets_0715-112317

The morning planets Mars, Jupiter and Venus at 7:15 a.m. November 23, 2017, about a half hour before sunrise on a really flat horizon.  Created using Stellarium.


Planets at sunset and sunrise of a single night

Planets at sunset and sunrise of a single night starting with sunset on the right on November 22, 2017. The night ends on the left with sunrise on the 22nd. Click on the image to enlarge. Created using my LookingUp program.


11/10/2017 – Ephemeris – The North Taurid Meteors are reaching peak this weekend

November 10, 2017 1 comment

Ephemeris for Friday, November 10th. The Sun will rise at 7:32. It’ll be up for 9 hours and 46 minutes, setting at 5:19. The Moon, at last quarter today, will rise at 12:07 tomorrow morning.

One of the little known meteor showers for most of us are the North and South Taurid meteor showers. The shower that will reach peak this weekend is the North Taurids. They may show only 5 an hour when their radiants are overhead, but they are reported to be very bright. The radiant, the place where the meteors will appear to come from is just south of the Pleiades, will be up just about all night. Saturday night the Moon will rise at 1:15 a.m. Sunday night it will rise at 2:21 a.m. Both Taurid meteor showers are thought to be related to Encke’s Comet, the periodic comet with a period of only 3.3 years, the shortest known. A posting on about this years shower talked about the possibility that one of these meteorites might reach the ground. has an excellent article about the Taurid meteor showers:

The times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.


Northern Taurid meteor radiant

Northern Taurid meteor radiant near the Pleiades in Taurus the bull. Note the face of Taurus, the letter V or stars and Aldebaran. The stars in the face without Aldebaran is a star cluster called the Hyades. Created using Stellarium.

07/28/2017 – Ephemeris – A Sun ‘n Star party tomorrow at the Sleeping Bear Dunes National Lakeshore

July 28, 2017 1 comment

Ephemeris for Friday, July 28th. The Sun rises at 6:24. It’ll be up for 14 hours and 47 minutes, setting at 9:12. The Moon, 2 days before first quarter, will set at 12:18 tomorrow morning.

Tomorrow afternoon and evening will be what we call a Sun & Star Party at the Sleeping Bear Dunes National Lakeshore. This event will be at the Dune Climb. From 4 to 6 p.m., the Sun will be featured using two types of telescopes, one showing the sun’s photosphere in what we call white light, and another showing the chromosphere above it in the light of hydrogen giving a completely different view. At 6 p.m. Professor Jerry Dobek of Northwestern Michigan College and the college’s Rogers Observatory will be at the Visitors Center in Empire talking about dark skies and how to promote sensible lighting. Starting at 9 p.m. will be a star party, actually really a planet party, viewing the Jupiter early, plus Saturn, and the Moon.

The times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.

Categories: Uncategorized

06/19/2017 – Ephemeris – The hero Hercules in the stars

June 19, 2017 1 comment

Ephemeris for Monday, June 19th. Today the Sun will be up for 15 hours and 33 minutes, setting at 9:30, and it will rise tomorrow at 5:57. The Moon, 2 days past last quarter, will rise at 3:33 tomorrow morning.

The greatest Greek hero of all, Hercules, gets a dim group of stars on the border between the spring and summer stars. At 11 p.m. Hercules is high in the eastern sky. It is located above and right of the bright star, Vega, also in the east. Hercules’ central feature is a keystone shaped box of stars, called the Keystone, which represents the old boy’s shorts. From each top corner extend lines of stars that are his legs, from the bottom stars, the rest of his torso and arms extend. So in one final indignity he’s upside down in our sky. Just below and right of the topmost star of the keystone is what looks like a fuzzy star in binoculars or small telescope. It is the Great Hercules Globular Star Cluster, also known as M13, home to a million stars.

The times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.



Hercules animation showing neighboring stars, constellation outlines, deep sky objects, and constellation art for Hercules. Created using Stellarium. Click on image to enlarge.


M13, the Great Globular Star Cluster in Hercules. Credit: Scott Anttila

Categories: Uncategorized

04/11/2017 – Ephemeris – What’s under Jupiter’s cloud tops?

April 11, 2017 Comments off

Ephemeris for Tuesday, April 11th.  The Sun will rise at 7:04.  It’ll be up for 13 hours and 17 minutes, setting at 8:22.  The Moon, at full today, will rise at 8:54 this evening.

I made an error in yesterday’s on-air program which I fixed before posting this blog version.  The moon Io will be over the face of Jupiter from when it rises tonight until 8:58 p.m.*, thereafter it will be seen just to the west of the planet.  What we see of Jupiter are its cloud tops.  Planetary astronomers have some very educated guesses as to what lies beneath them.  An atmosphere of mainly hydrogen and helium, ending in a hot liquid ocean of hydrogen.  Beneath that a core of metallic hydrogen that generates the planet’s huge magnetic field.  Below that maybe a core of solid iron and other metals.  NASA’s Juno spacecraft now orbiting Jupiter is tasked with finding out the interior structure by measuring the velocity of the spacecraft as it flies just above the cloud tops of this giant planet.

The times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.

* Observers in other locations around the world can check out the table from yesterday’s post of other Jovian satellite events after this entry is posted at 4:01 UT, April 11, 2017.


Jupiter on two nights

Jupiter and its moons in a telescope at 10 p.m. both April 10th & 11th, 2017. Created using Cartes du Ciel (Sky Charts).

For a year’s worth of Jovian satellite events and when the Great Red Spot crosses Jupiter’s central meridian, go to:

Juno Spacecraft

The Juno spacecraft. Credit: NASA.

Jupiter's south pole

A February 2, 2017 Juno image of Jupiter’s south pole and its chaotic storm clouds. I think I have a paisley tie that looks like that. Credit NASA/JPL-Caltech/SwRI/MSSS/John Landino.

01/01/2017 – Happy Ephemeris New Year

January 1, 2017 Comments off

Since the month and year starts on a Sunday, and the Ephemeris program is not broadcast on the weekend I will give you some information that will be part of the January preview program that will run on Monday.

NASA Calendar of Planetary Events

Credit:  Sky Events Calendar by Fred Espenak and Sumit Dutta (NASA’s GSFC)

To generate your own calendar go to

Times are Eastern Time and follow the time change dates.

    Date   Time  Event
Jan 01  Su       Venus: 46.8° E
    02  Mo 04:20 Moon-Venus: 2° S
    02  Mo 13:14 Moon Descending Node
    03  Tu 01:47 Moon-Mars: 0.3° S
    03  Tu 09:10 Quadrantid Meteor Shower: ZHR = 120
    04  We 05:59 Perihelion: 0.9833 AU
    05  Th 14:47 First Quarter
    09  Mo 04:03 Mercury-Saturn: 6.7° N
    09  Mo 09:07 Moon-Aldebaran: 0.4° S
    10  Tu 01:07 Moon Perigee: 363200 km
    11  We 04:32 Moon North Dec.: 18.9° N
    12  Th 06:34 Full Moon
    12  Th 07:59 Venus Greatest Elongation: 47.1° East
    14  Sa 23:07 Moon-Regulus: 0.9° N
    15  Su 05:45 Moon Ascending Node
    19  Th 00:26 Moon-Jupiter: 3° S
    19  Th 04:59 Mercury Greatest Elongation: 24.1° West
    19  Th 17:14 Last Quarter
    21  Sa 19:14 Moon Apogee: 404900 km
    24  Tu 05:37 Moon-Saturn: 4° S
    25  We 06:59 Moon South Dec.: 18.9° S
    25  We 19:46 Moon-Mercury: 4° S
    27  Fr 19:07 New Moon
    29  Su 17:21 Moon Descending Node
    31  Tu 01:12 Jupiter-Spica: 3.5° N
    31  Tu 09:34 Moon-Venus: 4.2° N
    31  Tu 20:09 Moon-Mars: 2.4° N
Feb 01  We       Venus: 45.5° E

January 2017 Calendar

LU                  Ephemeris of Sky Events for Interlochen/TC
January, 2017    Local time zone: EST
|Sun  1| 08:20a  05:13p  08:53 | 06:23p  07:09a |      Set  08:55p   13%|
|Mon  2| 08:20a  05:14p  08:54 | 06:24p  07:09a |      Set  10:00p   21%|
|Tue  3| 08:20a  05:15p  08:55 | 06:25p  07:10a |      Set  11:06p   31%|
|Wed  4| 08:20a  05:16p  08:56 | 06:26p  07:10a |      Set  12:14a   41%|
|Thu  5| 08:19a  05:17p  08:57 | 06:27p  07:10a |F Qtr Set  01:24a   52%|
|Fri  6| 08:19a  05:18p  08:58 | 06:28p  07:09a |      Set  02:35a   63%|
|Sat  7| 08:19a  05:19p  08:59 | 06:29p  07:09a |      Set  03:47a   74%|
|Sun  8| 08:19a  05:20p  09:01 | 06:30p  07:09a |      Set  04:58a   83%|
|Mon  9| 08:19a  05:21p  09:02 | 06:31p  07:09a |      Set  06:07a   91%|
|Tue 10| 08:18a  05:22p  09:04 | 06:32p  07:09a |      Set  07:11a   97%|
|Wed 11| 08:18a  05:23p  09:05 | 06:33p  07:09a |      Set  08:07a  100%|
|Thu 12| 08:17a  05:25p  09:07 | 06:34p  07:08a |Full  Rise 06:04p  100%|
|Fri 13| 08:17a  05:26p  09:08 | 06:35p  07:08a |      Rise 07:12p   97%|
|Sat 14| 08:16a  05:27p  09:10 | 06:36p  07:08a |      Rise 08:20p   92%|
|Sun 15| 08:16a  05:28p  09:12 | 06:37p  07:07a |      Rise 09:26p   85%|
|Mon 16| 08:15a  05:30p  09:14 | 06:38p  07:07a |      Rise 10:31p   77%|
|Tue 17| 08:15a  05:31p  09:16 | 06:39p  07:06a |      Rise 11:33p   68%|
|Wed 18| 08:14a  05:32p  09:18 | 06:40p  07:06a |      Rise 12:33a   59%|
|Thu 19| 08:13a  05:33p  09:20 | 06:42p  07:05a |L Qtr Rise 01:32a   49%|
|Fri 20| 08:13a  05:35p  09:22 | 06:43p  07:05a |      Rise 02:30a   40%|
|Sat 21| 08:12a  05:36p  09:24 | 06:44p  07:04a |      Rise 03:27a   31%|
|Sun 22| 08:11a  05:37p  09:26 | 06:45p  07:03a |      Rise 04:23a   23%|
|Mon 23| 08:10a  05:39p  09:28 | 06:46p  07:03a |      Rise 05:18a   15%|
|Tue 24| 08:09a  05:40p  09:30 | 06:47p  07:02a |      Rise 06:09a    9%|
|Wed 25| 08:08a  05:42p  09:33 | 06:49p  07:01a |      Rise 06:57a    4%|
|Thu 26| 08:07a  05:43p  09:35 | 06:50p  07:00a |      Rise 07:41a    1%|
|Fri 27| 08:06a  05:44p  09:37 | 06:51p  07:00a |New   Set  05:43p    0%|
|Sat 28| 08:05a  05:46p  09:40 | 06:52p  06:59a |      Set  06:45p    1%|
|Sun 29| 08:04a  05:47p  09:42 | 06:54p  06:58a |      Set  07:51p    4%|
|Mon 30| 08:03a  05:49p  09:45 | 06:55p  06:57a |      Set  08:58p   10%|
|Tue 31| 08:02a  05:50p  09:47 | 06:56p  06:56a |      Set  10:06p   17%|
* Nautical Twilight
** Moonrise or moonset, whichever occurs between sunset and sunrise

08/02/2016 – Ephemeris – Two events for the Grand Traverse Astronomical Society this weekend

September 2, 2016 Comments off

Ephemeris for Friday, September 2nd.  The Sun will rise at 7:06.  It’ll be up for 13 hours and 9 minutes, setting at 8:16.  The Moon, 1 day past new, will set at 9:00 this evening.

This is another busy weekend for the Grand Traverse Astronomical Society.  Tonight there will be a general meeting of the society at 8 p.m. followed by a star party at 9 p.m. at Northwestern Michigan College’s Rogers Observatory, located on Birmley Road south of Traverse City, to which all are welcome.  The featured speaker for the meeting will be Dr. David Penney who will talk about Late Pleistocene Fauna and Extinction and its possible astronomical cause.  Saturday there will be a star party at Sleeping Bear Dunes National Lakeshore’s Dune Climb starting at 9 p.m.  Both star parties will feature the star clusters and nebulae found in the Milky Way, and views of Saturn and Mars.  The dunes are the darkest spot around.

Times are for the Traverse City/Interlochen area of Michigan. They may be different for your location.