Sigma Pegasi — Double Star in Pegasus
Observe
1Physical Properties
Magnitude
5.16
Spectral Type
F7IV
subgiant
Star Color
Yellow
(B-V 0.48)
Distance
76 ly
2Position & Identifiers
RA
22h 52m 24.1s
Dec
+09° 50' 08.0"
Constellation
Pegasus
(Peg)
HR
8697
HIP
112935
HD
216385
SAO
127810
Bayer
Sigma
Flamsteed
49 Peg
Querying VizieR catalog...
3How easy to split?
Primary
5.2 mag
Companion
10.2 mag
Separation
16.0″
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| Telescope | Bortle 3 | Bortle 4 | Bortle 5 |
|---|---|---|---|
| 80 mm refractor 80mm refr. | Medium+ | Medium | Hard+ |
| 150 mm Newton 150mm Newt. | Easy | Medium+ | Medium+ |
| Celestron C8 (203 mm SCT) C8 203mm | Easy | Easy | Easy |
Easy
Medium
Hard
Very hard
Impossible
Bortle 3 = rural · 4 = outer suburbs · 5 = suburbs
4Visibility
Set a location in User Settings to see visibility data.
Best season
Jul – Sep
(peak: Aug)
5Multiple Star System B,C: optical
Separation
16.0″
Companion Mag
10.2
Companion Sp
M4
Position Angle
83°
Star Colors
A: Yellow
B: Red
Discoverer
EHR 19
CPM companion M4.
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
A: 5.2 · B: 10.2 · Sep: 16.0″ · PA: 83° · N up, E right
Resolved · Rayleigh: 2.3″ · Dawes: 1.9″ · Eff: 2.3″
Explore
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
14
Light Travel Time Machine
15
Relativistic Travel
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Visibility scores assume a 150 mm Newton at Bortle 4.
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