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Posts Tagged ‘Lyra’

07/13/2017 – Ephemeris – Constellations of the Summer Triangle I: Lyra the harp

July 13, 2017 1 comment

Ephemeris for Thursday, July 13th. Today the Sun will be up for 15 hours and 16 minutes, setting at 9:26, and it will rise tomorrow at 6:10. The Moon, 3 days before last quarter, will rise at 12:02 tomorrow morning.

Very high up in the eastern sky at 11 p.m. can be found a bright star just above a small, narrow, but very distinctive parallelogram of stars. They are the stars of the constellation Lyra the harp. The bright star is Vega, member of the Summer Triangle and one of the twenty one brightest first magnitude stars. Vega is actually the 5th brightest night-time star. The harp, according to Greek mythology, was invented by the Greek god Hermes. The form of the harp in the sky, is as he had invented it: by stretching strings across a tortoise-shell. Hermes gave it to his half-brother Apollo, who in turn gave it to the great musician Orpheus. The Sun’s motion with respect to most stars around it is towards the vicinity of Lyra.

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

Addendum

The Summer Triangle July 5, 2012 at 11 p.m. Created using Stellaruim and The Gimp.

The Summer Triangle. Created using Stellarium.

Annimated Lyra finder chart

Animated Lyra finder chart. The lyre image not supplied by Stellarium but is from The World’s Earliest Music by Hermann Smith, a Project Gutenberg E book, figure 60, captioned “The Chelys or Greek Tortoiseshell Lyre”. Image created using Stellarium and GIMP.

06/29/2017 – Ephemeris – A closer look at the star Vega

June 29, 2017 1 comment

Ephemeris for Thursday, June 29th. Today the Sun will be up for 15 hours and 31 minutes, setting at 9:31, and it will rise tomorrow at 6:00. The Moon, 1 day before first quarter, will set at 1:21 tomorrow morning.

The bright star high in the east is Vega, one of the stars of the Summer Triangle an informal constellation called an asterism. Vega belongs to the official constellation Lyra the harp, which includes a narrow parallelogram of stars to its south. Vega is regarded by astronomers as a standard calibration star. Though a first magnitude star, its actual magnitude is 0.03. It is a type A0 pure white star, and is 27 light years away. Astronomers however got a shock in 1983 when calibrating the Infrared Astronomy Satellite (IRAS) on it: Vega showed an excess of Infrared radiation that means the star is orbited by a disk of dust, perhaps a Kuiper belt of its own. Due to the slow wobble of the earth’s axis Vega will be our pole star in 14 thousand years.

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

Addendum

Lyra

Magnified view of Lyra. Created using Stellarium.

Vega

Vega in the mid-infrared from the Spitzer Infrared Satellite. Credit: NASA/JPL-Caltech/University of Arizona.

Categories: Ephemeris Program, stars Tags: ,

06/22/2017 – Ephemeris – Now that it’s summer, lets check out the Summer Triangle

June 22, 2017 1 comment

Ephemeris for Thursday, June 22nd. Today the Sun will be up for 15 hours and 33 minutes, setting at 9:31, and it will rise tomorrow at 5:57. The Moon, 1 day before new, will rise at 5:45 tomorrow morning.

We’re a day into summer, and the asterism or informal constellation called the Summer Triangle can be seen rising in the east as it gets dark. Highest of the three bright stars is Vega in the constellation Lyra the harp, whose body is seen in a narrow parallelogram nearby. The second star of the triangle is Deneb lower and left of Vega, It appears dimmer than Vega because it is by far the most distant of the three. The third star of the Summer Triangle is seen farther below and a right of Vega. It is Altair in Aquila the eagle, and the closest. Altair is 16.5 light years away, Vega is 27 light years while Deneb may be a whopping 2600 light years away. One light year is 6 trillion miles (9 trillion km).

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

Addendum

The Summer Triangle July 5, 2012 at 11 p.m. Created using Stellaruim and The Gimp.

The Summer Triangle. Created using Stellarium and The Gimp.

07/25/2016 – Ephemeris – Hermes’ Harp

July 25, 2016 Comments off

Ephemeris for Monday, July 25th.  The Sun rises at 6:21.  It’ll be up for 14 hours and 54 minutes, setting at 9:16.  The Moon, 1 day before last quarter, will rise at 12:34 tomorrow morning.

High up in the eastern sky at 11 p.m. can be found a bright star just north of a small, narrow, but very distinctive parallelogram of stars.  They are the stars of the constellation Lyra the harp.  The bright star is Vega, one of the twenty-one brightest stars, first magnitude stars.  Vega is actually the 5th brightest night-time star. The harp, according to Greek mythology, was invented by the Greek god Hermes.  The form of the harp in the sky, is as he had invented it: by stretching strings across a tortoise shell.  Hermes gave it to his half-brother Apollo, who in turn gave it to the great musician Orpheus.  In binoculars, near Vega, two stars appear together.  They barely appear to the unaided eye as one star, called Epsilon Lyrae.

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

Addendum

Lyra

Lyra as a tortoise shell harp. Created using Stellarium and free clip art.

Closeup on Vega and Epsilon Lyrae. Created using Stellarium.

Closeup on Vega and Epsilon Lyrae. Created using Stellarium.

06/23/2016 – Ephemeris – Tis the season to view the Summer Triangle

June 23, 2016 Comments off

Ephemeris for Thursday, June 23rd.  Today the Sun will be up for 15 hours and 34 minutes, setting at 9:32, and it will rise tomorrow at 5:58.  The Moon, 3 days past full, will rise at 11:43 this evening.

Now that summer is here, the asterism or informal constellation called the Summer Triangle can be seen in the east as it gets dark.  Highest of the three bright stars is Vega in the constellation Lyra the harp, whose body is seen in a narrow parallelogram nearby.  The second star of the triangle is Deneb lower and left of Vega, It appears dimmer than Vega because its is by far the most distant of the three.  The third star of the Summer Triangle is seen farther below and right of Vega.  It is Altair in Aquila the eagle, and the closest.  Altair is 16.7 light years away, Vega is 25 light years while Deneb may be a whopping 2600 light years away.   With a light year at 6 trillion miles.  That’s mind boggling to think in miles at least.

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

Addendum

The Summer Triangle July 5, 2012 at 11 p.m. Created using Stellaruim and The Gimp.

The Summer Triangle. Created using Stellarium and The Gimp.

07/21/2015 – Ephemeris – Vega, the brightest star of the Summer Triangle

July 21, 2015 Comments off

Ephemeris for Tuesday, July 21st.  Today the Sun will be up for 15 hours and 3 minutes, setting at 9:20.   The Moon, 3 days before first quarter, will set at 12:01 tomorrow morning.  Tomorrow the Sun will rise at 6:17.

The bright star high in the east is Vega, one of the stars of the Summer Triangle an informal constellation called an asterism. Vega belongs to the official constellation Lyra the harp, which includes a narrow parallelogram of stars to its south. Vega was regarded by astronomers as a standard calibration star. Though a first magnitude star, its actual magnitude is 0.03 and slightly variable. It is a type A0  (A-zero) pure white star, and is 25 light years away. Astronomers however got a shock in 1983 when calibrating the Infrared Astronomy Satellite (IRAS) on it: Vega showed an excess of Infrared radiation that means the star is orbited by a disk of dust, perhaps the beginnings of a planetary system.  Due to the slow wobble of the earth’s axis Vega will be our pole star in 14 thousand years.

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

Addendum

The Summer Triangle July 5, 2012 at 11 p.m. Created using Stellaruim and The Gimp.

The Summer Triangle. Created using Stellarium and The Gimp.

Lyra

Magnified view of Lyra. Created using Stellarium.

Vega

Vega in the mid-infrared from the Spitzer Infrared Satellite. Credit: NASA/JPL-Caltech/University of Arizona

07/16/2015 – Ephemeris – The Summer Triangle is the sign of the season

July 16, 2015 Comments off

Ephemeris for Thursday, July 16th.  Today the Sun will be up for 15 hours and 12 minutes, setting at 9:25.   The Moon, 1 day past new, will set at 9:32 this evening, and tomorrow the Sun will rise at 6:13.

We’re almost a month into summer, and the asterism or informal constellation called the Summer Triangle can be seen midway up the sky in the east as it gets dark.  Highest of the three bright stars is Vega in the constellation Lyra the harp, whose body is seen in a narrow parallelogram nearby.  The second star of the triangle is Deneb lower and left of Vega, It appears dimmer than Vega because it is by far the most distant of the three.  The third star of the Summer Triangle is seen farther below and a right of Vega.  It is Altair in Aquila the eagle, and the closest.  Altair is 16.5 light years away, Vega is 27 light years while Deneb is so far away that it’s distance is in some doubt and may be 2,600 light years away.

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

Addendum

Summer Triangle. Created using Stellarium.

Summer Triangle. Created using Stellarium.