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51 Gem

Observable Variable Star Good (47/100)

Range: 6.6 - 7.0, Period: 50.0d, Type: SRB

HIP 34909; 51 Gem VariableStar Gem Visible Level 3 Medium telescope (6-8") - Monitor brightness changes
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Physical Properties

Magnitude 5.00
Period 50.000 days
Variable Type Semi-Regular Variable (Late-type Giant)
Spectral Type M4IIIab
Star Color Red (B-V 1.66)
Distance 296.5 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

Visibility

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Light Curve

Comparison Stars

Nearby stable stars for estimating brightness (AAVSO)

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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
N E 18° A (5.0) B (12.0)

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 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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