Pleione
HIP 17851; 28 Tau
HIP 17851; 28 Tau
DoubleStar
Tau
Visible
Level 3
Medium telescope (6-8") - Requires steady seeing
Physical Properties
Magnitude
5.09
Range
4.83 - 5.38
Period
12630.000 days
Variable Type
Gamma Cassiopeiae (Eruptive Be Star)
Spectral Type
B8Vpe
Star Color
Blue-white
(B-V -0.08)
Position & Identifiers
RA
03h 49m 11.2s
Dec
+24° 08' 12.0"
Constellation
Tau
HR
1180
HIP
17851
Flamsteed
28 Tau
Variable ID
BU Tau
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Visibility
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Light Curve
Multiple Star System
Separation
168.1″
Companion Mag
12.0
Companion Sp
M5V
Position Angle
226°
Star Colors
A: Blue-white
B: Red
Discoverer
HL 28
Eyepiece View
32x
Dawes: 1.9″
TFOV: 1.6°
Realistic = true angular size
Sep: 168.1″ · PA: 226° · 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
Gamma Cas 4.77 - 5.50V. Var. may be clue to shell episodes. Shell ejection 1936 led to decrease in light 1937-1958. | Variable hydrogen emission. Shell spectrum shows phase changes every 17 or 34 yrs.
Suspected long period.
Pleiades cluster; Mel 22 #2181.
Shell star.
Pleione.
Survey Image
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