51 Gem
HIP 34909; 51 Gem
DoubleStar
Gem
Visible
Level 3
Medium telescope (6-8") - Requires steady seeing
Physical Properties
Magnitude
5.00
Period
50 days
Variable Type
Semi-Regular Variable (Late-type Giant)
Spectral Type
M4IIIab
Star Color
Red
(B-V 1.66)
Distance
297 ly
Position & Identifiers
RA
07h 13m 22.3s
Dec
+16° 09' 32.0"
Constellation
Gem
HR
2717
HIP
34909
Flamsteed
51 Gem
Variable ID
BQ Gem
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Visibility
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Multiple Star System
Components
3
Component IDs
AB
Separation
152.0″
Companion Mag
12.0
Position Angle
18°
Star Colors
A: Red
Discoverer
H 6 74
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 152.0″ · PA: 18° · 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 Fusion
Stellar Notes
SRb 6.63 - 7.01B, about 50d.
Wolf 630 group.
Also classified K3V, but this is not consistent with type of light variability.
Survey Image
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