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Posts Tagged ‘Andromeda’

10/11/2018 – Ephemeris – Pegasus the aerobatic horse

October 11, 2018 Comments off

Ephemeris for International Day of the Girl, Thursday, October 11th. The Sun will rise at 7:53. It’ll be up for 11 hours and 11 minutes, setting at 7:05. The Moon, 3 days past new, will set at 8:56 this evening.

Rising ever higher in the east at as it gets dark around 9 p.m. can be found one of the great autumn constellations: Pegasus the flying horse of Greek myth. Its most visible feature is a large square of four stars, now standing on one corner. This feature, called the Great Square of Pegasus, represents the front part of the horse’s body. The horse is quite aerobatic because it is seen flying upside down. Remembering that fact, the neck and head is a bent line of stars extending from the right corner star of the square. Its front legs can be seen in a gallop extending to the upper right from the top star of the square. From the left star extend, not hind legs but the constellation of Andromeda, an important constellation in its own right.  The Anishinaabek peoples native to this region saw ab upright Moose (Mooz) here.

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

Addendum

Pegasus and the Moose
Pegasus-Moose animation. The Anishinaabek constellation moose’s antlers in this imagining use the stars of the Western constellation of Lacerta the lizard. Created using Stellarium and the GIMP.

The constellation art is part of the latest versions of Stellarium. Ojibwe (Anishinaabek) constellation art by Annette S Lee and William Wilson from Ojibwe Sky Star Map Constellation Guide, ISBN 978-0-615-98678-4.

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11/21/2017 – Ephemeris – The constellation of the fish has me looking for the fish

November 21, 2017 1 comment

Ephemeris for Tuesday, November 21st. The Sun will rise at 7:47. It’ll be up for 9 hours and 21 minutes, setting at 5:09. The Moon, 3 days past new, will set at 7:50 this evening.

High in the south at 8 or 9 p.m. are the four bright stars of the Great Square of Pegasus, the upside down flying horse. Lying along the left and bottom sides of that square is the constellation of Pisces the fish, one of the 12 constellations of the Zodiac that lie along the path of the sun, moon and planets. Even though the constellation is called the fish, the two fish themselves are not represented in the stars, at least that’s how I see it. What can be traced in the stars is the rope, that’s tied to their tails, anchored at the extreme southeastern part of the constellation. The right or western end of the Pisces is the asterism, or informal constellation, of the Circlet. It’s the loop of 5 stars, the rope around the tail of one of the two fish. The other end, without a loop, ends up under Andromeda.  Artists have always supplied the fish.

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

Addendum

Pisces finder chart

Animated Pisces finder chart base at November 21, at 9 p.m. Created using Stellarium and GIMP.

11/07/2017 – Ephemeris – The autumn constellations are all visible in the early evening

November 7, 2017 1 comment

Ephemeris for Election Day for some folks, Tuesday, November 7th. The Sun will rise at 7:28. It’ll be up for 9 hours and 54 minutes, setting at 5:23. The Moon, 3 days before last quarter, will rise at 8:49 this evening.

We’ll have about an hour and a half of reasonably dark skies between 6:30 and nearly 9 p.m. – At 8 p.m. all the autumn constellations are visible. The Zodiacal constellations from Capricornus in the southwest through Aquarius, Pisces and Aries, all relatively faint to Taurus rising in the east northeast. Pegasus the flying horse is seen in the high south-southeast. It and the connected constellation of Andromeda the chained princess are seen above Aquarius through Aries. The bright star Fomalhaut holds a lonely vigil low in the south, High in the northeast is the W shaped constellation of Cassiopeia the queen, under which is Perseus, her son-in-law and hero down to the bright star Capella.

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

Autumn constellations.

The sky at 8 p.m. November 7, 2017 showing the autumn constellations, centered on the southeastern sky. Click on the image to enlarge. The Milky Way has been brightened to show its passage through Perseus better. The red line is the ecliptic, the path of the Sun through the Zodiac. Created using Stellarium.

Addendum

 

10/30/2017 – Ephemeris – Halloween preview: The Ghoul Star

October 30, 2017 1 comment

Ephemeris for Monday, October 30th. The Sun will rise at 8:17. It’ll be up for 10 hours and 15 minutes, setting at 6:33. The Moon, 3 days past first quarter, will set at 3:50 tomorrow morning.

Tomorrow night is the spookiest night of the year, so lets preview the spookiest star of all. It’s Algol, from Ghoul Star or Demon Star. The Chinese had a name for it that meant ‘piled up corpses’. It’s the second brightest star in the constellation Perseus the hero, rising in the northeast this evening. The star is located where artists have drawn the severed head of Medusa, whom he had slain. Medusa was so ugly that she turned all who gazed upon her to stone. Algol is her still glittering eye. Astronomers finally found out what was wrong with Algol. It does a slow 6 hour wink every two days 21 hours, because it is two stars that eclipse each other. It began to dip this morning just before sunrise and it will again centered on 11:41 p.m. Friday night.

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

Addendum

Algol Finder

Perseus, Cassiopeia, Andromeda with Algol finder animation for Autumn evenings. Created using Stellarium and GIMP.

Eclipsing Binary Star

Animation of an eclipsing binary star like Algol. Credit: Wikimedia Commons h/t Earth and Sky

 

10/16/2017 – Ephemeris – Andromeda, the chained princess

October 16, 2017 1 comment

Ephemeris for Monday, October 16th. The Sun will rise at 7:59. It’ll be up for 10 hours and 56 minutes, setting at 6:55. The Moon, 3 days before new, will rise at 5:29 tomorrow morning.

The stars of the constellations Andromeda the chained princess look like they’re supposed to be the hind legs of Pegasus the flying horse which is high in the southeast at 9 p.m. Andromeda is high in the east She is seen in the sky as two diverging curved strings of stars that curve to the left and up from the leftmost star of the Great Square of Pegasus. Her predicament was caused by her boastful mother Cassiopeia, and the wrath of the god Poseidon. She was rescued by the hero Perseus, a nearby constellation, riding his steed Pegasus. Andromeda’s claim to astronomical fame is the large galaxy barely visible to the unaided eye just above the upper line of stars, the Great Andromeda Galaxy 2.5 million light years away.

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

Addendum

Andromeda and friends

Andromeda and neighboring constellations that are related to her story. Created using Stellarium and GIMP.

Andromeda at 9 p.m. with the Great Andromeda Galaxy. Created using Stellarium.

Andromeda at 9 p.m. with the Great Andromeda Galaxy. Created using Stellarium.

The Great Andromeda Galaxy (M31). Image taken by Scott Anttila.

The Great Andromeda Galaxy (M31). Image taken by Scott Anttila.  It appears here more extensive than it appears visually to the naked eye or in telescopes.

11/24/2016 – Ephemeris – The little constellation that used to start the seasonal year

November 24, 2016 Comments off

Ephemeris for Thanksgiving Day, Thursday, November 24th.  The Sun will rise at 7:52.  It’ll be up for 9 hours and 14 minutes, setting at 5:06.  The Moon, 3 days past last quarter, will rise at 3:54 tomorrow morning.

From antiquity, the first constellation of the Zodiac has been Aries the ram.  That’s the constellation the Sun entered on the first day of spring, or the vernal equinox.  Well that was a couple of thousand years ago.  Currently the vernal equinox point is in western Pisces.  This is due to the wobbling of the Earth’s axis called precession.  The spinning Earth like and top or gyroscope wobbles when force is applied to it.  In this case the Sun and Moon.  One wobble takes 26,000 years to complete.  Anyway, Aries is a small constellation of four stars in a bent line, below the triangular constellation of Triangulum, which is itself below Andromeda.  It’s a bit west or right of the Pleiades or Seven Sisters star cluster.

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

Addendum

Aries the ram

Aries the ram animated finder chart for 9 p.m. November 24, 2016. Created using Stellarium and GIMP.

The vernal equinox today

The vernal equinox today, where the blue line, the celestial equator and the orange line, the ecliptic or path of the Sun cross. The Sun is where these lines cross on the first day of spring (March 20th around here). Note that the vernal equinox is now in western Pisces. Created using Stellarium.

The vernal equinox in AD 100

The vernal equinox back in AD 100, where the blue line, the celestial equator and the orange line, the ecliptic or path of the Sun cross. The Sun is where these lines cross on the first day of spring. Note that the vernal equinox was at the east edge of Pisces. Created using Stellarium.

10/27/2016 – Ephemeris – Finding the Great Andromeda Galaxy

October 27, 2016 Comments off

Ephemeris for Thursday, October 27th.  The Sun will rise at 8:14.  It’ll be up for 10 hours and 23 minutes, setting at 6:37.  The Moon, 3 days before new, will rise at 6:02 tomorrow morning.

The closest large galaxy to our Milky Way galaxy is the Great Andromeda Galaxy seen in the eastern sky when it gets dark.  It is barely visible to the naked eye.  To locate it first find the Great Square of Pegasus high in the east, standing on one corner.  The left star of the square is the head of the constellation Andromeda.  Follow two stars to the left and a bit downward, then two stars straight up.  The galaxy is near that last star as a small smudge of light.  Binoculars are the best way to see it as a thin spindle of light.  A telescope can see only the bright nucleus of the galaxy, that spans 6 Moon diameters in photographs.  M31 is its first catalog designation and it is two and a half million light years away.

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

Addendum

Andromeda at 9 p.m. with the Great Andromeda Galaxy. Created using Stellarium.

Andromeda in the evening with the Great Andromeda Galaxy. Astronomers called it a nebula before the discovered it was a galaxy like the Milky Way.  Created using Stellarium.

Great Andromeda Galaxy

The Great Andromeda Galaxy (M31) as seen in binoculars. Visually even in a telescope the hub of this galaxy is all that is seen. However it also can be seen with the naked eye. My photograph.

The Great Andromeda Galaxy (M31). Image taken by Scott Anttila.

The Great Andromeda Galaxy (M31). Image taken by Scott Anttila.