Sigma Tau
HIP 21673; Sigma1 Tau; 91 Tau
HIP 21673; Sigma1 Tau; 91 Tau
Star
Tau
Visible
Level 2
Small telescope (4")
Physical Properties
Magnitude
5.07
Spectral Type
A4m
Star Color
Yellow-white
(B-V 0.15)
Distance
155 ly
Position & Identifiers
RA
04h 39m 09.2s
Dec
+15° 47' 59.0"
Constellation
Tau
HR
1478
HIP
21673
Bayer
Sigma1
Flamsteed
91 Tau
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Visibility
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Multiple Star System
Components
3
Component IDs
AB
Separation
431.2″
Star Colors
A: Yellow-white
B: Yellow-white
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 Fusion
Stellar Notes
Binary with HR 1479 at 431" and with fainter SB companion, 7.4v at 0.0015".
251.205d, K 5.0k/s, V0 +17.0k/s, asini 16.3. Unresolved by speckle interferometry.
Hyades?
Survey Image
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