Sigma Andromedae — Double Star in Andromeda
Observe
1Physical Properties
Magnitude
4.52
Variable Type
Delta Scuti (Pulsating)
Spectral Type
A2V
Star Color
White
(B-V 0.05)
Distance
142 ly
2Position & Identifiers
RA
00h 18m 19.7s
Dec
+36° 47' 07.0"
Constellation
Andromeda
(And)
HR
68
HIP
1473
HD
1404
SAO
53798
Bayer
Sigma
Flamsteed
25 And
Querying VizieR catalog...
3How easy to split?
Primary
4.5 mag
Companion
11.4 mag
Separation
7.0″
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| Telescope | Bortle 3 | Bortle 4 | Bortle 5 |
|---|---|---|---|
| 80 mm refractor 80mm refr. | V. hard+ | V. hard+ | V. hard+ |
| 150 mm Newton 150mm Newt. | Hard | Hard | Hard |
| Celestron C8 (203 mm SCT) C8 203mm | Hard+ | Hard+ | Hard+ |
Easy
Medium
Hard
Very hard
Impossible
Bortle 3 = rural · 4 = outer suburbs · 5 = suburbs
To reach "Medium" at Bortle 3, you'd need at least a 230 mm reflector.
4Visibility
Set a location in User Settings to see visibility data.
Best season
Aug – Oct
(peak: Sep)
5Multiple Star System
Separation
7.0″
Companion Mag
11.4
Position Angle
146°
Star Colors
A: White
Discoverer
DRS 33
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
A: 4.5 · B: 11.4 · Sep: 7.0″ · PA: 146° · N up, E right
Resolved · Rayleigh: 2.3″ · Dawes: 1.9″ · Eff: 2.3″
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6
Size Comparison
Querying VizieR for stellar data…
7
Compare Stars
8
Spectral Classification
9
Hertzsprung-Russell Diagram
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10
Stellar Lifecycle
11
Blackbody Spectrum
12
Stellar Absorption Spectrum
Simulated absorption spectrum based on spectral type. Hover over lines to identify elements.
13
Stellar Fusion
Discover
14Stellar Notes
Delta Sct?, 4.49 - 4.55V.
Sirius group; UMa stream.
15
Light Travel Time Machine
16
Relativistic Travel
Nearby in the Sky
Other targets within a few degrees — pan your scope a little and keep exploring.
Visibility scores assume a 150 mm Newton at Bortle 4.
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