25 Arietis

25 Arietis

Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Cetus
Right ascension	02^h 27^m 23.38951^s[1]
Declination	+10° 11′ 53.9679″[1]
Apparent magnitude (V)	6.45[2]
Characteristics
Spectral type	F5 V[3]
B−V color index	0.450±0.007[2]
Astrometry
Radial velocity (Rv)	−39.54±0.25[1] km/s
Proper motion (μ)	RA: −293.750[1] mas/yr Dec.: −203.157[1] mas/yr
Parallax (π)	27.3827 ± 0.0412 mas[1]
Distance	119.1 ± 0.2 ly (36.52 ± 0.05 pc)
Absolute magnitude (MV)	+3.60[2]
Details
Mass	1.19[4] M☉
Radius	1.44±0.05[1] R☉
Luminosity	2.892+0.006 −0.007[1] L☉
Surface gravity (log g)	4.30[4] cgs
Temperature	6,274+119 −105[1] K
Metallicity [Fe/H]	−0.19[5] dex
Age	1.598[4] Gyr
Other designations
BD+09°323, HD 15228, HIP 11427, SAO 110537[6]
Database references
SIMBAD	data

25 Arietis is a star in the equatorial constellation of Cetus, near the modern constellation boundary with Aries for which it is named. 25 Arietis is the Flamsteed designation. It has an apparent visual magnitude of 6.45,^[2] placing it near the lower limit of visibility to the naked eye. The distance to this star can be estimated from its annual parallax shift of 27.38 mas,^[1] which yields a separation of 119 light years. The star is moving closer to the Earth with a heliocentric radial velocity of −40 km/s,^[1] and is predicted to come as close as 102.8 light-years in 259,000 years.^[2] It has a relatively high proper motion, traversing the celestial sphere at the rate of 0.359″ per year.^[7]

This is an ordinary F-type main-sequence star with a stellar classification of F5 V.^[3] It is about 1.6^[4] billion years old with an estimated 1.19^[4] times the mass of the Sun and 1.44^[1] times the Sun's radius. The star is radiating 2.9^[1] times the Sun's luminosity from its photosphere at an effective temperature of around 6,274 K.^[1]

References

1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
2. 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.
3. Eggen, O. J. (1962), "Space-velocity vectors for 3483 stars with proper motion and radial velocity", Royal Observatory Bulletin, 51: 79, Bibcode:1962RGOB...51...79E.
4. 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.
5. Casagrande, L.; et al. (June 2011), "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey", Astronomy and Astrophysics, 530: A138, arXiv:1103.4651, Bibcode:2011A&A...530A.138C, doi:10.1051/0004-6361/201016276, S2CID 56118016.
6. "25 Ari". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved December 29, 2018.
7. Lépine, Sébastien; Shara, Michael M. (March 2005), "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)", The Astronomical Journal, 129 (3): 1483–1522, arXiv:astro-ph/0412070, Bibcode:2005AJ....129.1483L, doi:10.1086/427854, S2CID 2603568.