Sigma Aur
HIP 25292; Sigma Aur; 21 Aur
DoubleStar
Aur
Visible
Level 4
Large telescope (10"+) - Requires steady seeing
Physical Properties
Magnitude
4.99
Spectral Type
K4III
Star Color
Red
(B-V 1.42)
Distance
1087.2 ly
Position & Identifiers
RA
05h 24m 39.2s
Dec
+37° 23' 08.0"
Constellation
Aur
HR
1773
HIP
25292
Bayer
Sigma
Flamsteed
21 Aur
Double Cat
3984
Querying VizieR catalog...
Visibility
Set a location in User Settings to see visibility data.
Multiple Star System
Components
4
Component IDs
AB
Separation
7.5″
Companion Mag
12.0
Position Angle
163°
Star Colors
A: Red
Discoverer
BU 888
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 7.5″ · PA: 163° · 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
AB fixed.
Survey Image
Loading survey image…