Theta Cnc
HIP 41822; Theta Cnc; 31 Cnc
DoubleStar
Cnc
Visible
Level 3
Medium telescope (6-8") - Requires steady seeing
Physical Properties
Magnitude
5.35
Spectral Type
K5III
Star Color
Red
(B-V 1.56)
Position & Identifiers
RA
08h 31m 35.7s
Dec
+18° 05' 40.0"
Constellation
Cnc
HR
3357
HIP
41822
Bayer
Theta
Flamsteed
31 Cnc
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Visibility
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Multiple Star System
Components
3
Component IDs
O
Separation
74.5″
Companion Mag
11.8
Position Angle
62°
Star Colors
A: Red
Discoverer
HJ 2452
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 74.5″ · PA: 62° · 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
Theta Cnc B is NSV 4117, 11.5v at 58", 59d.
Occultation pair 6.4, 6.4v, blended mag. and colors. Visual component 10v at 63". Suspected as double by Innes from | observation of occultation of April 28, 1898 (references: Astron. Nachr. 150, 423, 1899; MNRAS, 61, 416, 1901; | Cape Ann. 2, part 6, 1907).
Survey Image
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