21 Lyncis
Star in the constellation Lynx
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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]
  | |
| 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]