Alfirk
HIP 106032; Beta Cep; 8 Cep
Observable Variable Star
Range: 3.2 - 3.3, Period: 4.6h, Type: Beta C
HIP 106032; Beta Cep; 8 Cep
DoubleStar
Cep
Visible
Level 3
Medium telescope (6-8") - Requires steady seeing
Physical Properties
Magnitude
3.23
Variable Type
Beta Cephei (Pulsating)
Spectral Type
B1V
Star Color
Blue
(B-V -0.22)
Distance
682.0 ly
Position & Identifiers
RA
21h 28m 39.6s
Dec
+70° 33' 39.0"
Constellation
Cep
HR
8238
HIP
106032
Bayer
Beta
Flamsteed
8 Cep
Variable ID
Bet Cep
Double Cat
15032
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Visibility
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Comparison Stars for Alfirk (3.2–3.3)
Nearby stable stars for estimating brightness (AAVSO)
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Multiple Star System
Components
3
Component IDs
AB
Separation
13.5″
Companion Mag
8.6
Position Angle
248°
Star Colors
A: Blue
Discoverer
STF2806
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 13.5″ · PA: 248° · 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
ADS 15032A, Beta C 3.16 - 3.27V, 0.1904881d, modulation period 10.893d. SiIV and CIV vary. Satellite UV obs. | indicate temp. varies 1340d, max./min. radius 1.038.
ADS 15032AB, 50y. B, 7.84V, +0.18(B-V), +0.06(U-B), A2.5V, vsini 60:k/s. Third component discovered by speckle | interferometry, mag. diff about 4v. Sep. 0.025". Possible circumstellar material.
ADS 15032A, 10.893d, K 3.1k/s, V0 -3.1k/s, asini 0.397. Resolved by speckle interferometry 1986.45, sep. 0.11".
Cep OB1.
0.004".
Alfirk; Alphirk.
Survey Image
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