Chamukuy
HIP 20894; Theta2 Tau; 78 Tau
Observable Double Star
Excellent (63/100)
Sep: 336.9", Companion: mag 3.9
HIP 20894; Theta2 Tau; 78 Tau
DoubleStar
Tau
Visible
Level 1
Naked eye / Binoculars - Requires steady seeing
Physical Properties
Magnitude
3.40
Variable Type
Delta Scuti (Pulsating)
Spectral Type
A7III
Star Color
Yellow-white
(B-V 0.18)
Distance
150.3 ly
Position & Identifiers
RA
04h 28m 39.7s
Dec
+15° 52' 15.0"
Constellation
Tau
HR
1412
HIP
20894
Bayer
Theta2
Flamsteed
78 Tau
Variable ID
The2 Tau
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Visibility
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Multiple Star System
Components
4
Component IDs
AB
Separation
336.9″
Companion Mag
3.9
Position Angle
347°
Star Colors
A: Yellow-white
B: Orange
Discoverer
STFA 10
Eyepiece View
32x
Dawes: 1.9″
TFOV: 1.6°
Realistic = true angular size
Sep: 336.9″ · PA: 347° · 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
Delta Sct, amp. 0.03V (variable), 0.080d. Possibly also eclipsing.
CPM with HR 1411. Close occultation binary, 3.5, 5.8v, sep. 0.005".
Sep. 0.005", 140.728d, K 31.0k/s, V0 +39.6k/s, asini 39.7, e 0.75.
Member of Hyades cluster; Mel 25 #72.
Survey Image
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