12 Cap
Observable Double Star
Excellent (62/100)
Sep: 22.0", Companion: mag 6.7
HIP 101123; 12 Cap
DoubleStar
Cap
Visible
Level 1
Naked eye / Binoculars - Requires steady seeing
Physical Properties
Magnitude
5.94
Spectral Type
A3Vn
Star Color
White
(B-V 0.08)
Position & Identifiers
RA
20h 29m 53.9s
Dec
-18° 34' 60.0"
Constellation
Cap
HR
7830
HIP
101123
Flamsteed
12 Cap
Double Cat
13902
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Visibility
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Multiple Star System
Separation
22.0″
Companion Mag
6.7
Companion Sp
A7V
Position Angle
238°
Star Colors
A: White
B: Yellow-white
Discoverer
SHJ 324
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 22.0″ · PA: 238° · 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
CPM with HR 7829.
Survey Image
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