 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 | |
| Database references | |
| SIMBAD | data |
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]
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]
References
- ^ a b c d e f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv: 0708.1752, Bibcode: 2007A&A...474..653V, doi: 10.1051/0004-6361:20078357, S2CID 18759600.
- ^ a b c d e f g h Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv: 1108.4971, Bibcode: 2012AstL...38..331A, doi: 10.1134/S1063773712050015, S2CID 119257644.
- ^ a b Abt, Helmut A.; Morrell, Nidia I. (1995), "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars", Astrophysical Journal Supplement, 99: 135, Bibcode: 1995ApJS...99..135A, doi: 10.1086/192182
- ^ a b c d e f g h David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv: 1501.03154, Bibcode: 2015ApJ...804..146D, doi: 10.1088/0004-637X/804/2/146, S2CID 33401607.
-
^
"21 Lyn".
SIMBAD.
Centre de données astronomiques de Strasbourg. Retrieved 2019-06-05.
{{ cite web}}: CS1 maint: postscript ( link) - ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv: 0806.2878, Bibcode: 2008MNRAS.389..869E, doi: 10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
