Secunda Hyadum
HIP 20455; Delta1 Tau; 61 Tau
HIP 20455; Delta1 Tau; 61 Tau
DoubleStar
Tau
Visible
Level 3
Medium telescope (6-8") - Requires steady seeing
Physical Properties
Magnitude
3.76
Spectral Type
G9.5III CN0.5
Star Color
Orange
(B-V 0.98)
Distance
155.3 ly
Position & Identifiers
RA
04h 22m 56.1s
Dec
+17° 32' 33.0"
Constellation
Tau
HR
1373
HIP
20455
Bayer
Delta1
Flamsteed
61 Tau
Querying VizieR catalog...
Visibility
Set a location in User Settings to see visibility data.
Multiple Star System
Components
3
Component IDs
AB
Separation
112.6″
Companion Mag
13.2
Position Angle
336°
Star Colors
A: Orange
Discoverer
BUP 55
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 112.6″ · PA: 336° · N up, E left
Resolved · Rayleigh: 2.3″ · Dawes: 1.9″ · Eff: 3.1″
Size Comparison
Querying VizieR for stellar data…
Stellar Lifecycle
Spectral Classification
Hertzsprung-Russell Diagram
Loading HR diagram…
Blackbody Spectrum
Stellar Absorption Spectrum
Simulated absorption spectrum based on spectral type. Hover over lines to identify elements.
Stellar Notes
Amp. 0.1V.
529.8d, K 3.0k/s, V0 +39.5k/s, asini 19.8. D. W. Dunham indicates 3.9, 13.0v, sep. 0.04".
In Taurus cluster; Mel 25 #41; the Hyades.
Hyadum II.
Survey Image
Loading survey image…