1 Lyncis

1 Lyncis is a single^[5] star in the northern constellation of Lynx. It is also known by its variable star designation of UW Lyncis; 1 Lyncis is the Flamsteed designation. This object is visible to the naked eye as a faint, reddish-hued star with an apparent visual magnitude of 4.95.^[3] It is moving further from the Earth with a heliocentric radial velocity of 12 km/s.^[7]

1 Lyncis

A light curve for UW Lyncis, plotted from Hipparcos data[1]
Observation data Epoch J2000      Equinox J2000
Constellation	Lynx
Right ascension	06h 17m 54.81907s[2]
Declination	+61° 30′ 55.0251″[2]
Apparent magnitude (V)	4.95[3]
Characteristics
Evolutionary stage	asymptotic giant branch[4]
Spectral type	M3IIIab[5]
U−B color index	+1.96[3]
B−V color index	+1.83[3]
Variable type	Lb?[6]
Astrometry
Radial velocity (Rv)	+11.56±0.44[7] km/s
Proper motion (μ)	RA: −10.59±0.36[2] mas/yr Dec.: −3.11±0.29[2] mas/yr
Parallax (π)	5.11±0.33 mas[2]
Distance	640 ± 40 ly (200 ± 10 pc)
Absolute magnitude (MV)	−1.44[8]
Details
Radius	156[9] R☉
Luminosity	2,848[10] L☉
Temperature	3,485[10] K
Other designations
1 Lyn, UW Lyn, BD+61°869, FK5 2479, HD 42973, HIP 29919, HR 2215, SAO 13787[11]
Database references
SIMBAD	data

The star is an aging red giant of spectral type M3IIIab,^[5] currently on the asymptotic giant branch,^[4] having exhausted the hydrogen at its core and evolved away from the main sequence. It has been classified as a possible slow irregular variable,^[6] after being found to be slightly variable in 1969 by Olin J. Eggen.^[12] Its changes in brightness are complex, with two shorter changeable periods of 35–40 and 47–50 days due to the star's pulsations, and a longer period of 1,500 days possibly due to the star's rotation or convectively induced oscillatory thermal (COT) mode.^[13] The star has expanded to 156^[9] times the Sun's radius and it is radiating 2,848^[10] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 3,485 K.^[10]