81 Gem
HIP 37908; 81 Gem
DoubleStar
Gem
Visible
Level 6
Professional/Research - Requires steady seeing
Physical Properties
Magnitude
4.88
Spectral Type
K4III-IIIb
Star Color
Red
(B-V 1.45)
Distance
233.0 ly
Position & Identifiers
RA
07h 46m 07.4s
Dec
+18° 30' 36.0"
Constellation
Gem
HR
3003
HIP
37908
Flamsteed
81 Gem
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Visibility
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Multiple Star System
Separation
0.1″
Companion Mag
5.8
Position Angle
-1°
Star Colors
A: Red
Discoverer
OCC 229
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 0.1″ · PA: -1° · N up, E left
Unresolved · 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
D. W. Dunham gives 5.8, 5.8v, sep. 0.1".
61 Cyg group.
Also classified K5III.
Survey Image
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