Beta Mon
HIP 30867; Beta Mon; 11 Mon
Observable Double Star
Showpiece (76/100)
Sep: 7.3", Companion: mag 5.0
HIP 30867; Beta Mon; 11 Mon
DoubleStar
Mon
Visible
Level 2
Small telescope (4") - Requires steady seeing
Physical Properties
Magnitude
4.60
Variable Type
Ellipsoidal Variable
Spectral Type
B3Ve
Star Color
Blue-white
(B-V -0.10)
Distance
155.3 ly
Position & Identifiers
RA
06h 28m 49.0s
Dec
-07° 01' 58.0"
Constellation
Mon
HR
2356
HIP
30867
Bayer
Beta
Flamsteed
11 Mon
Double Cat
5107
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Visibility
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Multiple Star System
Components
4
Component IDs
AB
Separation
7.3″
Companion Mag
5.0
Companion Sp
B2V
Position Angle
132°
Star Colors
A: Blue-white
B: Blue
Discoverer
STF 919
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 7.3″ · PA: 132° · 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
Hydrogen lines var. K 30k/s. Shell line velocities do not correspond to orbital elements; may be due to gaseous ring.
Triple system with HR 2357 and 2358. Combined mag., color 3.74V, -0.15(B-V), all Be stars. AB, 17000y; AC, sep. 10", | 29000y. Component D, 12.2v at 26" from A. Uncertain which of components A,B,C, HR 2356,7,8 is the light variable | NSV 2977, for which the mag. 3.75V is a blend of all three.
12.5y, K 30k/s, asini 1900. Shell oscillations. Spectrum var. 12.5y for 3.5 cycles, then ceased.
Shell star with variable H alpha emission.
Survey Image
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