Alpheratz
HIP 677; Alpha And; 21 And
HIP 677; Alpha And; 21 And
DoubleStar
And
Visible
Level 3
Medium telescope (6-8") - Requires steady seeing
Physical Properties
Magnitude
2.06
Variable Type
Alpha2 CVn (Magnetic Rotating)
Spectral Type
B5.5V
Star Color
Blue-white
(B-V -0.11)
Distance
101.9 ly
Position & Identifiers
RA
00h 08m 23.3s
Dec
+29° 05' 26.0"
Constellation
And
HR
15
HIP
677
Bayer
Alpha
Flamsteed
21 And
Variable ID
Alp And
Double Cat
94
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Visibility
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Multiple Star System
Separation
92.8″
Companion Mag
11.1
Position Angle
286°
Star Colors
A: Blue-white
B: Yellow-white
Discoverer
H 5 32
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 92.8″ · PA: 286° · 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
Alpha CV 2.02 - 2.06V, 0.9636 or 0.966222d. Some spectral lines vary same period, others half period, some nonvariable.
ADS 94A, 96.6960d, K 30.8k/s, V0 -11.6k/s, asini 34.2.
Pleiades group.
Gallium II lines strong. HgMn star. Spectrum appears earlier at shorter wavelengths.
ALPHERATZ; Alpherat; Sirrah; Sirah. Also formerly called Delta Peg.
Radius 5 solar.
Survey Image
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