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10 Serpentis
Observation data; Epoch J2000 Equinox J2000
Constellation	Serpens
Right ascension	15h 28m 38.23670s
Declination	+01° 50′ 31.4852″
Apparent magnitude (V)	5.15
Characteristics
Spectral type	A6 III or A7 IV
B−V color index	0.245±0.005
Astrometry
Radial velocity (Rv)	−10.2±2.8 km/s
Proper motion (μ)	RA: −85.35 mas/yr ; Dec.: −34.31 mas/yr
Parallax (π)	25.16 ± 0.31 mas
Distance	130 ± 2 ly ; (39.7 ± 0.5 pc)
Absolute magnitude (MV)	2.15
Details
Mass	1.64 M☉
Luminosity	11.9±0.4 L☉
Surface gravity (log g)	4.24±0.14 cgs
Temperature	7,872±268 K
Rotational velocity (v sin i)	110 km/s
Age	424 Myr
Other designations
	10 Ser, BD+02° 2965, FK5 3221, HD 137898, HIP 75761, HR 5746, SAO 121020
Database references
SIMBAD	data

10 Serpentis is a single,^[8] white-hued star in Serpens Caput, the western section of the equatorial constellation of Serpens. It is faintly visible to the naked eye with an apparent visual magnitude of 5.15.^[2] Located around 129 ly (39.7 pc) distant, it is moving closer to the Sun with a heliocentric radial velocity of −10 km/s and will make its closest approach in around 983,000 years at a separation of about 112 ly (34.2 pc).^[2]

Abt and Morrell (1995) gave this star a stellar classification of A6 III,^[3] matching an evolved red giant star that has used up its core hydrogen. In contrast, Houk and Swift (1999) classed it A7 IV,^[4] which is more in line with an evolving subgiant star that is on its way to becoming a giant. It has a high rate of spin with a projected rotational velocity of 115 km/s, giving it an oblate shape with an equatorial bulge that is an estimated 7% larger than the polar radius.^[9] The star is about 424 million years old with 1.64^[5] times the mass of the Sun and is radiating 12^[6] times the Sun's luminosity from its photosphere at an effective temperature of roughly 7,872 K.^[5]

References

^ ^a ^b ^c ^d ^e 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 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 Series, 99: 135, Bibcode:1995ApJS...99..135A, doi:10.1086/192182.
^ ^a ^b Houk, N.; Swift, C. (1999), "Michigan catalogue of two-dimensional spectral types for the HD Stars", Michigan Spectral Survey, 5, Bibcode:1999MSS...C05....0H.
^ ^a ^b ^c ^d ^e ^f 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.
^ ^a ^b ^c Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.
^ "10 Ser". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-03-19.
^ 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.