The Winter Skies
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Transcript of The Winter Skies
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The Winter Skies
An (indoor) stargaze by Dan Roth
Jupiter
Venus
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Orion
Rigel
Orion Nebula1500 ly away12 million yrs old
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Canis Major
Sirius
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Gemini
Pollux
Castor
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Taurus and the Pleiades
400 ly away100 million yrs old
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Taurus
Aldebran50 ly away4 solar masses40 solar radii
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M45—The Pleiades
Alcyone
N
E
Atlas
Merope
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Big Dipper
Not to scale
Mizar
Alcor
Mizar itself is in fact a double star, and each of those components are doubles. The 2 stars in Mizar A orbit each other every 20 days at half the distance from the sun to Mercury.
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Leo
Not to scale
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Star Trails...
Orion, 4 min exposure. The dotted line in the upper right is probably an airplane, and the long trail in the lower left is probably a meteor.
Canis major, 8 min exposure. The bright trail on the left is Sirius
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...and some calculations
S = 206265”/Fmm S = 206265/50 S =4125.3”/mm
So, measuring the length of a trail on the picture, one can calculate how far the star moved across the sky
For Sirius (8 min exp): Trail length is 9mm (4125.3”/mm)*(9mm) = 37127.7” or
about 10 degrees
We can check ourselves by doing the same for Orion, whose exposure was 4 minutes—half that of the Sirius picture. We expect the distance to be half.
Trail length is about 5 mm (we're doing well already!)
(4125.3”/mm)*(5mm) = 20626.5” Multiply this by 2 and we get 4125.3” or
about 11 degrees. This is a bit more than what we were
expecting, but it is only a 1% error, which can be attributed to human errors such as inexact measurements, inexact exposure times and out-of-focus images.
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Photo Technical Info.
Jupiter and Venus Rite Aid Color Film (ASA 200), Pentax
Spotmatic, f/1.8, 5 sec exp, tripod w/55mm lens
Orion Kodak TX 400, Pentax K1000, f/2, 60 sec exp,
piggypack w/ 75-205mm zoom lens Canis Major
Kodak TX 400, Pentax K1000, f/2, 60 sec exp, piggypack w/ 75-205mm zoom lens
Gemini Kodak TX 400, Pentax K1000, f/2, 20 sec exp,
tripod w/ 50mm lens Taurus/Pleiades
Kodak TX 400, Pentax K1000, f/2, 30 sec exp, tripod w/ 50mm lens
Taurus Kodak TX 400, Pentax K1000, f/3.8, 5 sec exp,
tripod w/ 75-205mm zoom lens The Pleiades
Kodak TX 400, Pentax K1000, 120 sec exp, prime focus
The Big Dipper (handle) Kodak TX 400, Pentax K1000, f/2, 10 sec exp,
tripod w/ 50mm lens The Big Dipper (bowl)
Kodak TX 400, Pentax K1000, f/2, 20 sec exp, tripod w/ 50mm lens
Leo (body) Kodak TX 400, Pentax K1000, f/2, 20 sec exp,
tripod w/ 75-205mm zoom lens Leo (head)
Kodak TX 400, Pentax K1000, f/2, 20 sec exp, tripod w/ 75-205mm zoom lens
Orion Trails Kodak TX 400, Pentax K1000, f/4, 4 min exp,
tripod w/ 50mm lens Sirius Trails
Kodak TX 400, Pentax K1000, f//22, 8 min exp, tripod w/ 50mm lens