Tau Cap
HIP 101923; Tau Cap; 14 Cap
DoubleStar
Cap
Visible
Level 5
Expert level - Requires steady seeing
Physical Properties
Magnitude
5.22
Spectral Type
B6III
Star Color
Blue-white
(B-V -0.12)
Distance
652.3 ly
Position & Identifiers
RA
20h 39m 16.4s
Dec
-14° 57' 17.0"
Constellation
Cap
HR
7889
HIP
101923
Bayer
Tau
Flamsteed
14 Cap
Double Cat
14099
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Visibility
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Multiple Star System
Components
4
Component IDs
AB
Separation
0.3″
Companion Mag
7.3
Position Angle
122°
Star Colors
A: Blue-white
B: Yellow-white
Discoverer
HU 200
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 0.3″ · PA: 122° · N up, E left
Unresolved · 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
AB 5.8 B6III, 6.3 B6IV, 200y, a = 0.31". Visual third component 13v at 159". Occultation fourth companion, 9.3V, sep. | 0.052".
Tau1 Fl 13 and Tau2 Fl 14 Cap are, respectively, HD 196348 (6.76V, K3III) and HR 7889, the former being | in the BS Supplement. HR 7889 is usually called simply Tau Cap.
Survey Image
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