21 Lyncis

21 Lyncis is a single^[6] star in the northern constellation of Lynx. It is visible to the naked eye as a faint, white-hued star with an apparent visual magnitude of 4.61.^[2] The star is located at a distance of about 274 light years away from the Sun, based on parallax.^[1] It is moving further away from the Earth with a heliocentric radial velocity of around +27 km/s.^[2]

21 Lyncis

21 Lyncis (center) in optical light
Observation data Epoch J2000      Equinox J2000
Constellation	Lynx
Right ascension	07h 26m 42.85187s[1]
Declination	+49° 12′ 41.4907″[1]
Apparent magnitude (V)	4.61[2]
Characteristics
Evolutionary stage	main sequence
Spectral type	A0.5Vs[3]
B−V color index	−0.001±0.002[2]
Astrometry
Radial velocity (Rv)	+26.8±0.1[2] km/s
Proper motion (μ)	RA: −10.22[1] mas/yr Dec.: −49.29[1] mas/yr
Parallax (π)	11.92±0.24 mas[1]
Distance	274 ± 6 ly (84 ± 2 pc)
Absolute magnitude (MV)	−0.01[2]
Details
Mass	2.22[4] M☉
Luminosity	102.01[2] L☉
Temperature	9,692±330[4] K
Rotational velocity (v sin i)	18[4] km/s
Age	272[4] Myr
Other designations
21 Lyn, BD+49° 1623, FK5 2572, HD 58142, HIP 36145, HR 2818, SAO 41764[5]
Database references
SIMBAD	data

This object is an ordinary A-type main-sequence star with a stellar classification of A0.5Vs,^[3] where the 's' suffix indicates "sharp" lines in the spectrum, usually due to slow rotation. It is about 272^[4] million years old with a projected rotational velocity of 18 km/s.^[4] The star has 2.22^[4] times the mass of the Sun and is radiating 102^[2] times the luminosity of the Sun from its photosphere at an effective temperature of 9,692 K.^[4]