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Gamma (γ) Andromedae
Contrast Multiple Star
Right Ascension | 2h 03m 54s | Best Seen | 9/15 - 3/1 |
Declination | 42° 19' 51" | Combined Magnitude | 2.10 |
Apparent Separation | 9.8" | Constellation | Andromeda |
Actual |
Compared to Sun |
|
Distance | 355 ly | -- |
Separation | 60 billion miles | 645 au |
Orbital Period | -- | -- |
Actual Brightness | -- | 1092 / 91 |
Magnitude | 2.33 / 5.02 | |
Mass | -- | -- |
Surface Gravity | -- | -- |
Surface Composition (by mass) | 74% hydrogen 24% helium 2% everything else |
same |
Spectral Type | K3 IIb / (B9V, A0V) | G2 V |
Density (gram/cubic cm) | -- | -- |
What To Look For Through The Telescope
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Recommended eyepiece: 24mm or 40 mm.
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When people look through the telescope they should see two stars next to each other. The brighter star should appear yellow and the dimmer star blue.
Gamma Andromedae Information:
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This star is actually a quadruple star system.
a. Star A is the yellow star (K3IIb).
b. Star B is the blue star (B9V), and orbits Star A.
Star B is about 60 billion miles from Star A (600 Earth/Sun).
Star B is actually triple star system:Star C
(A0V)orbits Star B, and is about 3 billion miles from Star B (the distance from Sun to Neptune).
B and C take 60 years to orbit each other.Star D is only about 1 million miles away from Star B (Earth is 93 million from Sun).
B and D only take about 2.7 days to orbit each other.
Star D is so close to Star B they almost touch.
Star D can’t be seen, but it does make a wobble in the movement of Star B around Star A. -
Note that the colors of these stars may be more striking if they are slightly out of focus.
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References
Item | Updated | Notes |
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