Tau CMa
HIP 35415; Tau CMa; 30 CMa
DoubleStar
CMa
Visible
Level 4
Large telescope (10"+) - Requires steady seeing
Physical Properties
Magnitude
4.40
Spectral Type
O9Ib
Star Color
Blue-white
(B-V -0.15)
Position & Identifiers
RA
07h 18m 42.4s
Dec
-24° 57' 15.0"
Constellation
CMa
HR
2782
HIP
35415
Bayer
Tau
Flamsteed
30 CMa
Double Cat
5977
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Visibility
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Multiple Star System
Components
5
Component IDs
AP
Separation
8.3″
Companion Mag
10.2
Companion Sp
B2V
Position Angle
90°
Star Colors
A: Blue-white
B: Blue
Discoverer
HJ 3948
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 8.3″ · PA: 90° · 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
3.90 - 3.96p. Possibly same period as SB.
B, 10v at 8" fixed. D, 8.22V, -0.19(B-V), -0.93(U-B), B2V at 85".
ADS 5977A, 154.90d, K 49.5k/s, V0 +43k/s, asini 101.
Color excess E(B-V) = +0.15.
In cluster NGC 2362 #23; in HII reg. S310. Although a neutral hydrogen cloud about 0.5d in diameter is in the region, it | is at a much greater distance and not associated with the cluster.
uv1548 absorption strong, emission weak.
Survey Image
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