31 Ori
HIP 25737; 31 Ori
DoubleStar
Ori
Visible
Level 2
Small telescope (4") - Requires steady seeing
Physical Properties
Magnitude
4.71
Range
4.68 - 4.72
Period
141 days
Variable Type
Semi-Regular Variable
Spectral Type
K5III
Star Color
Red
(B-V 1.57)
Distance
544 ly
Position & Identifiers
RA
05h 29m 44.0s
Dec
-01° 05' 32.0"
Constellation
Ori
HR
1834
HIP
25737
Flamsteed
31 Ori
Variable ID
CI Ori
Double Cat
4097
Querying VizieR catalog...
Visibility
Set a location in User Settings to see visibility data.
Light Curve
Multiple Star System
Separation
12.7″
Companion Mag
9.7
Position Angle
87°
Star Colors
A: Red
Discoverer
STF 725
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 12.7″ · PA: 87° · 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 Fusion
Stellar Notes
ADS 4097, cst? 4.67: -4.71V.
CPM. Companion 9.70V, +0.71(B-V), +0.15(U-B), F7V.
Survey Image
Loading survey image…