HIP 21819
HIP 21819
DoubleStar
Tau
Visible
Level 2
Small telescope (4") - Requires steady seeing
Physical Properties
Magnitude
5.78
Spectral Type
A2V
Star Color
Blue-white
(B-V -0.03)
Position & Identifiers
RA
04h 41m 19.8s
Dec
+28° 36' 54.0"
Constellation
Tau
HR
1490
HIP
21819
Double Cat
3379
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Visibility
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Multiple Star System
Components
3
Component IDs
AB
Separation
43.2″
Companion Mag
10.7
Position Angle
55°
Star Colors
A: Blue-white
B: Orange
Discoverer
HJ 346
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 43.2″ · PA: 55° · 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
AB, CPM. Third component by Wallenquist, mag. diff 6.42, sep. 90".
Survey Image
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