24 Lyncis

24 Lyncis
Observation data; Epoch J2000 Equinox J2000
Constellation	Lynx
Right ascension	07h 43m 00.41551s
Declination	+58° 42′ 37.2950″
Apparent magnitude (V)	4.93
Characteristics
Spectral type	A3 IVn
B−V color index	+0.104±0.015
Astrometry
Radial velocity (Rv)	+9.4±2.3 km/s
Proper motion (μ)	RA: −37.50 mas/yr ; Dec.: −52.29 mas/yr
Parallax (π)	12.22±0.20 mas
Distance	267 ± 4 ly ; (82 ± 1 pc)
Absolute magnitude (MV)	0.37
Details
Mass	1.89 M☉
Radius	1.7 R☉
Luminosity	60.81 L☉
Surface gravity (log g)	3.25 cgs
Temperature	8,786±299 K
Rotational velocity (v sin i)	233 km/s
Age	262 Myr
Other designations
	24 Lyn, BD+59° 1103, FK5 292, HD 61497, HIP 37609, HR 2946, SAO 26474, WDS J07430+5843A
Database references
SIMBAD	data

24 Lyncis is a single^[8] star in the northern constellation of Lynx. It is visible to the naked eye as a dim, white-hued star with an apparent visual magnitude of 4.96.^[1] The distance to this star, as determined from its parallax measurements, is around 274 light years.^[1] It is moving further away from the Earth with a heliocentric radial velocity of about +9 km/s.^[2]

This object has a stellar classification of A3 IVn,^[3] matching an A-type star with a subgiant luminosity class. The 'n' suffix indicates "nebulous" absorption lines due to rapid rotation. The star is spinning with a projected rotational velocity of 233 km/s,^[6] giving it an equatorial bulge that is 17% larger than the polar radius.^[9] Zorec et al. (2012) estimate the star is actually 88% of the way through its main sequence lifetime.^[6] It is 262^[4] million years old with 1.89^[4] times the mass of the Sun. 24 Lyncis is radiating 61^[2] times the luminosity of the Sun from its photosphere at an effective temperature of 8,786 K.^[4]

There is a magnitude 11.15 visual companion at an angular separation of 55″ along a position angle of 324°, as of 2010.^[10]

References

^ ^a ^b ^c ^d ^e ^f ^g 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 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 Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819
^ ^a ^b ^c ^d ^e ^f ^g 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.
^ Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics, 367 (2) (Third ed.): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
^ ^a ^b ^c Zorec, J.; et al. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy and Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.
^ "24 Lyn". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-06-06.
^ 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.
^ van Belle, Gerard T. (March 2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review, 20 (1): 51, arXiv:1204.2572, Bibcode:2012A&ARv..20...51V, doi:10.1007/s00159-012-0051-2, S2CID 119273474.
^ Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466, Bibcode:2001AJ....122.3466M, doi:10.1086/323920.

[vanLeeuwen2007-1] ^ ^a ^b ^c ^d ^e ^f ^g 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.

[Anderson2012-2] ^ ^a ^b ^c ^d ^e ^f ^g 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.

[Cowley1969-3] Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819

[David2015-4] ^ ^a ^b ^c ^d ^e ^f ^g 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.

[cadars-5] Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics, 367 (2) (Third ed.): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.

[Zorec2012-6] Zorec, J.; et al. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy and Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.

[SIMBAD-7] "24 Lyn". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-06-06.

[Eggleton2008-8] 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.

[vanBelle2012-9] van Belle, Gerard T. (March 2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review, 20 (1): 51, arXiv:1204.2572, Bibcode:2012A&ARv..20...51V, doi:10.1007/s00159-012-0051-2, S2CID 119273474.

[WDSC2014-10] Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466, Bibcode:2001AJ....122.3466M, doi:10.1086/323920.

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Observation data Epoch J2000 Equinox J2000
Constellation	Lynx
Right ascension	07^h 43^m 00.41551^s^[1]
Declination	+58° 42′ 37.2950″^[1]
Apparent magnitude (V)	4.93^[2]
Characteristics
Spectral type	A3 IVn^[3]
B−V color index	+0.104±0.015^[2]
Astrometry

Radial velocity (R_v)	+9.4±2.3^[2] km/s
Proper motion (μ)	RA: −37.50^[1] mas/yr Dec.: −52.29^[1] mas/yr
Parallax (π)	12.22±0.20 mas^[1]
Distance	267 ± 4 ly (82 ± 1 pc)
Absolute magnitude (M_V)	0.37^[2]

Details

Mass	1.89^[4] `M`_☉
Radius	1.7^[5] `R`_☉
Luminosity	60.81^[2] `L`_☉
Surface gravity (log g)	3.25^[4] cgs
Temperature	8,786±299^[4] K
Rotational velocity (v sin i)	233^[6] km/s
Age	262^[4] Myr

Other designations
24 Lyn, BD+59° 1103, FK5 292, HD 61497, HIP 37609, HR 2946, SAO 26474, WDS J07430+5843A^[7]
Database references
SIMBAD	data

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