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Posts Tagged ‘Dog Star’

02/25/2022 – Ephemeris – The star that’s called the Pup

February 25, 2022 Comments off

This is Ephemeris for Friday, February 25th. Today the Sun will be up for 10 hours and 58 minutes, setting at 6:25, and it will rise tomorrow at 7:25. The Moon, 2 days past last quarter, will rise at 5:04 tomorrow morning.

Sirius is the brightest nighttime star and is located in the south at 9 p.m. below and a bit left of Orion the Hunter. We’ve visited Sirius last Friday. But there is another star in the Sirius system that is practically invisible due to Sirius’ dazzling glare. Its name is Sirius B, nicknamed the Pup, alluding to Sirius’ Dog Star title as the heart of Canis Major, Orion’s larger hunting dog. The tiny star was suspected as far back as 1834 due to Sirius’ wavy path in the sky against the more distant stars. Sirius and the Pup have 50-year orbits of each other. The Pup was first seen by famed 19th century telescope maker Alvan Clark in 1862 while testing a new telescope. The Pup was the first of a new class of stars to be discovered, white dwarfs. The Pup, with the mass of the Sun, is packed into the volume of the Earth.

The astronomical event times given are for the Traverse City/Interlochen area of Michigan (EST, UT – 5 hours). They may be different for your location.

Addendum

Sirius finder

A Sirius finder animation for late January/early February at around 8 pm. Even in bright moonlight, the seven bright stars of Orion can be seen. The three stars of Orion’s belt make a great pointer to Sirius. Created using Stellarium, GIMP and Libreoffice (for the arrow).

Sirius' path

Sirius A & B’s path in the sky, showing the wobble that betrayed the Pup’s presence. Credit Mike Guidry, University of Tennessee.

Two views of Sirius and the Pup

Sirius A and B imaged by two different space telescopes, revealing dramatically different views! Hubble’s image (left) shows Sirius A shining brightly in visible light, with diminutive Sirius B a tiny dot. However, in Chandra’s image (right) tiny Sirius B is dramatically brighter in X-rays! The “Universe in a Different Light” activity highlights more surprising views of some familiar objects: http://bit.ly/different-light-nsn NASA, ESA, H. Bond (STScI), and M. Barstow (University of Leicester) (left); NASA/SAO/CXC (right)

02/18/2022 – Ephemeris – Sirius, the brightest nighttime star

February 18, 2022 Comments off

This is Ephemeris for Friday, February 18th. Today the Sun will be up for 10 hours and 37 minutes, setting at 6:15, and it will rise tomorrow at 7:36. The Moon, 2 days past full, will rise at 8:32 this evening.

In the evening, the great constellation of Orion the hunter can be seen in the south. Its large rectangle of bright stars is easily visible, even with a full moon. The three stars in a straight line, his belt, tilt downward to the left to a very bright star merrily twinkling lower in the sky. This star is called Sirius, also known as the Dog Star because it’s in the heart of Orion’s larger hunting dog, Canis Major. It is an arc light white star as seen in binoculars or telescope. It is the brightest star in the night sky, and a neighboring star, just twice the distance of the closest star to the Sun at 8.6 light years. It’s name, Sirius, has nothing to do with a dog, but is from the Greek meaning scorching for its brightness or sparkling, due to its intense twinkling.

The astronomical event times given are for the Traverse City/Interlochen area of Michigan (EST, UT – 5 hours). They may be different for your location.

Addendum

Orion's belt points to Sirius

In the southern sky, Orion’s belt points to Sirius. Created using Stellarium, Libreoffice and GIMP.

02/07/2019 – Ephemeris – Siriusly, folks.

February 7, 2019 Comments off

Ephemeris for Friday, February 8th. Today the Sun will be up for 10 hours and 7 minutes, setting at 6:01, and it will rise tomorrow at 7:52. The Moon, half way from new to first quarter, will set at 9:48 this evening.

At 9 in the evening the great constellation of Orion the hunter can be seen in the south. Its large rectangle of bright stars is now upright, while in the center is a row of three stars, his belt. These stars tilt downward to the left to a very bright star merrily twinkling in the south-southeast. This star is called Sirius, also known as the Dog Star because it’s in the heart of Orion’s larger hunting dog, Canis Major. It is an arc light white star as seen in binoculars or telescope. It’s a neighboring star, just twice the distance of the closest star to the sun at 8.6 light years. It’s name, Sirius, has nothing to do with a dog, but is from the Greek meaning scorching for its brightness or sparkling, due to its intense twinkling.

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

Addendum

Orion's Belt points to Sirius

Orion’s Belt points to Sirius. Created using Stellarium.

01/25/2016 – Ephemeris – Sirius the Dog Star

January 25, 2016 Comments off

Ephemeris for Monday, January 25th.  The Sun will rise at 8:09.  It’ll be up for 9 hours and 31 minutes, setting at 5:41.   The Moon, 2 days past full, will rise at 7:43 this evening.

While we’re waiting for the bright Moon to leave the evening sky, let’s look at another bright star.  This one is the brightest of all, Sirius the Dog Star.  The Dog Star name comes from its position at the heart of the constellation Canis Major, the great dog of Orion the hunter.  The three stars of Orion’s belt tilt to the southeast and point to Sirius.  The name Sirius means ‘Dazzling One’, a reference to its great brilliance and twinkling.  The Romans thought Sirius added its heat to that of the Sun in summer to bring on the scorching Dog Days of July and August.  Its ancient Egyptian name was Sothis, and its first appearance in the morning twilight in late June signaled the flooding of the Nile, and the beginning of the Egyptian agricultural year.

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

Addendum

Orion's Belt points to Sirius

Orion’s Belt points to Sirius. Created using Stellarium.

01/22/2013 – Ephemeris – Sirius the Dog Star

January 22, 2013 1 comment

Ephemeris for Tuesday, January 22nd.  The sun will rise at 8:10.  It’ll be up for 9 hours and 27 minutes, setting at 5:37.   The moon, half way from first quarter to full, will set at 5:23 tomorrow morning.

The brightest star-like object in the evening sky is Jupiter high in the sky now.  The second brightest star-like object is Sirius, also known as the Dog Star.  It also is the brightest night-time star in our skies period.  Tonight at 9 p.m. it’s located low in the southeastern sky.  The Dog Star name comes from its position at the heart of the constellation Canis Major, the great dog of Orion the hunter.  The three stars of Orion’s belt tilt to the southeast and point to Sirius.  The name Sirius means ‘Dazzling One’ or ‘Scorcher’, a reference to its great brilliance and twinkling.  Its Egyptian name was Sothis, and its appearance in the dawn skies in late June signaled the flooding of the Nile, and the beginning of the Egyptian agricultural year.

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

Addendum

Winter Circle and Jupiter with Sirius

Winter Circle and Jupiter with Sirius at the bottom. Created using Stellarium.

12/20/11 – Ephemeris – Procyon, the “Little Dog Star”

December 20, 2011 2 comments

Tuesday, December 20th.  The sun will rise at 8:15.  It’ll be up for 8 hours and 48 minutes, setting at 5:04.   The moon, 3 days past last quarter, will rise at 4:45 tomorrow morning.

Visible low in the east at 9 p.m. appears the star Procyon  to its lower left is Sirius the brightest night time star.  Procyon is the bright star in the constellation Canis Minor, or lesser dog.  I can find only one other star in Canis Minor.  Perhaps it’s a hot dog.  If Sirius, in Canis major is the Dog Star then Procyon should be the Little Dog Star.  However Procyon is an interesting name.  It means “Before the dog”, which is an allusion to the fact that Procyon, though east of Sirius actually rises before it.  This is due to Procyon’s more northerly position.  This effect doesn’t work south of the equator, however.  Procyon is a star much like Sirius but farther away.  [It’s 11.41 to Sirius’ 8.6 light years away.  And like Sirius it even has a small white dwarf star in its system.]

* Times, as always are for the Traverse City/Interlochen area of Michigan.  Text in brackets was omitted in the audio program due to time constraints.

Addendum

Procyon, Sirius and the stars of winter. Created using Stellarium

Procyon, Sirius and the stars of winter. Created using Stellarium

The grid lines are right ascension and declination, analogous to longitude and latitude on the earth.  Looking eastward the right ascension lined run from the upper left to the lower right.  Thus Procyon is definitely farther east than Sirius.