Alpha Cap
HIP 100027; Alpha1 Cap; 5 Cap
HIP 100027; Alpha1 Cap; 5 Cap
DoubleStar
Cap
Visible
Level 3
Medium telescope (6-8") - Requires steady seeing
Physical Properties
Magnitude
4.24
Spectral Type
G3Ib
Star Color
Orange
(B-V 1.07)
Distance
543.6 ly
Position & Identifiers
RA
20h 17m 38.9s
Dec
-12° 30' 30.0"
Constellation
Cap
HR
7747
HIP
100027
Bayer
Alpha1
Flamsteed
5 Cap
Double Cat
13632
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Visibility
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Multiple Star System
Components
9
Component IDs
*
Separation
53.2″
Companion Mag
14.1
Position Angle
212°
Star Colors
A: Orange
B: Orange
Discoverer
BU 295
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 53.2″ · PA: 212° · 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
See note for HR 7754. ADS 13632B, 14v at 44"; C, 9.6v K5III, at 45" physical, vsini =<54k/s. D, 14.3v at 29" from C.
Prima Giedi; Algiedi Prima; Algedi with HR 7754.
Survey Image
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