31 Camelopardalis

31 Camelopardalis
	File:TUCamLightCurve.png; A visual band light curve for TU Camelopardalis, adapted from West (1968)
Observation data; Epoch J2000 Equinox J2000
Constellation	Camelopardalis
Right ascension	Template:RA
Declination	Template:DEC
Apparent magnitude (V)	5.20
Characteristics
Spectral type	A2V (A0IV + F0)
U−B Template:Engvar	+0.03
B−V Template:Engvar	+0.010
Variable type	β Lyr
Astrometry
Radial velocity (Rv)	Template:Val km/s
Proper motion (μ)	RA: +1.488 mas/yr ; Dec.: −17.928 mas/yr
Parallax (π)	7.1562±0.2336 mas
Distance	Template:Rnd ± Template:Rnd ly ; (Template:Rnd ± Template:Rnd pc)
Orbit
Period (P)	2.9333 d
Eccentricity (e)	0.00
Longitude of the node (Ω)	0.00°
Periastron epoch (T)	Template:Val
Semi-amplitude (K1); (primary)	78.0 km/s
Details
31 Cam A
Mass	Template:Val Template:Solar mass
Luminosity	Template:Val Template:Solar luminosity
Temperature	Template:Val K
Rotational velocity (v sin i)	75 km/s
Metallicity [Fe/H]	{{{metal_fe2}}} dex
Other designations
	Template:Odlist
Database references
SIMBAD	data

Template:Short description

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31 Camelopardalis is a binary star system in the northern circumpolar constellation of Camelopardalis. It is visible to the naked eye as a dim point of light with a peak apparent visual magnitude of +5.12.^[7] Parallax measurements provide a distance estimate of approximately 460 light years away from the Sun,^[2] and the system is drifting closer to the Earth with a radial velocity of −3 km/s.^[8]

This is a single-lined spectroscopic binary in a circular orbit with an orbital period of 2.93 days.^[9] It is a detached binary with two main sequence components that do not fill their Roche lobes.

Joel Stebbins observed the star for more than thirty nights from 1924 through 1927, and discovered that it is a variable star.^[11] It was given its variable star designation, TU Cameleopardis, in 1936.^[12] The orbital plane is oriented near the line of sight from the Earth, making this a Beta Lyrae–type eclipsing binary variable star. The primary eclipse lowers the visual magnitude to 5.29, while the secondary eclipse lowers it to 5.22.^[7]

References

Template:Reflist

Template:Stars of Camelopardalis

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Observation data Epoch J2000 Equinox J2000
File:TUCamLightCurve.png A visual band light curve for TU Camelopardalis, adapted from West (1968)^[1]
Constellation	Camelopardalis
Right ascension	Template:RA^[2]
Declination	Template:DEC^[2]
Apparent magnitude (V)	5.20^[3]
Characteristics
Spectral type	A2V^[4] (A0IV + F0)^[5]
U−B Template:Engvar	+0.03^[6]
B−V Template:Engvar	+0.010^[3]
Variable type	β Lyr^[7]
Astrometry

Radial velocity (R_v)	Template:Val^[8] km/s
Proper motion (μ)	RA: +1.488^[2] mas/yr Dec.: −17.928^[2] mas/yr
Parallax (π)	7.1562±0.2336 mas^[2]
Distance	Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc)

Orbit^[9]
Period (P)	2.9333 d
Eccentricity (e)	0.00
Longitude of the node (Ω)	0.00°
Periastron epoch (T)	Template:Val
Semi-amplitude (K₁) (primary)	78.0 km/s
Details
31 Cam A
Mass	Template:Val^[10] Template:Solar mass
Luminosity	Template:Val Template:Solar luminosity
Temperature	Template:Val K
Rotational velocity (v sin i)	75^[10] km/s

Metallicity [Fe/H]	{{{metal_fe2}}} dex
Other designations
Template:Odlist^[4]
Database references
SIMBAD	data

31 Camelopardalis

References

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