Sigma Gem
HIP 37629; Sigma Gem; 75 Gem
DoubleStar
Gem
Visible
Level 3
Medium telescope (6-8") - Requires steady seeing
Physical Properties
Magnitude
4.28
Range
4.13 - 4.29
Period
19.423 days
Variable Type
RS CVn (Chromospherically Active)
Spectral Type
K1III
Star Color
Orange
(B-V 1.12)
Distance
181.2 ly
Position & Identifiers
RA
07h 43m 18.7s
Dec
+28° 53' 01.0"
Constellation
Gem
HR
2973
HIP
37629
Bayer
Sigma
Flamsteed
75 Gem
Variable ID
Sig Gem
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Visibility
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Light Curve
Multiple Star System
Separation
195.5″
Companion Mag
10.8
Position Angle
319°
Star Colors
A: Orange
Discoverer
BLL 23
Eyepiece View
32x
Dawes: 1.9″
TFOV: 1.6°
Realistic = true angular size
Sep: 195.5″ · PA: 319° · N up, E left
Resolved · Rayleigh: 2.3″ · Dawes: 1.9″ · Eff: 3.1″
Size Comparison
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Stellar Lifecycle
Spectral Classification
Hertzsprung-Russell Diagram
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Blackbody Spectrum
Stellar Absorption Spectrum
Simulated absorption spectrum based on spectral type. Hover over lines to identify elements.
Stellar Notes
RS 4.13 - 4.29V, 19.423d.
19.605d, K 34.2k/s, V0 +45.8k/s, asini 9.22. Possible radio binary.
Eta Cep group.
H alpha emission.
Survey Image
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