HD 93905

HD 93905

Location of HD 93905 (circled)
Observation data Epoch J2000      Equinox J2000
Constellation	Antlia
Right ascension	10^h 49^m 57.0188^s[1]
Declination	−34° 03′ 29.4506″[1]
Apparent magnitude (V)	5.61[2]
Characteristics
Evolutionary stage	main sequence[3]
Spectral type	A1 V[4]
U−B color index	+0.05[5]
B−V color index	+0.04[5]
Astrometry
Radial velocity (Rv)	−9.5±1.3[6] km/s
Proper motion (μ)	RA: −41.069[1] mas/yr Dec.: +5.845[1] mas/yr
Parallax (π)	8.7989 ± 0.1617 mas[1]
Distance	371 ± 7 ly (114 ± 2 pc)
Absolute magnitude (MV)	0.00[2]
Details[3]
Mass	2.78±0.05 M☉
Radius	3.89[7] R☉
Luminosity	101±9 L☉
Surface gravity (log g)	3.77[8] cgs
Temperature	8995+125 −123 K
Rotational velocity (v sin i)	85[9] km/s
Age	256±6 Myr
Other designations
80 G. Antliae, CD−33° 7288, CPD−33° 2973, HD 93905, HIP 52965, HR 4238, SAO 201805
Database references
SIMBAD	data

HD 93905 (HR 4238) is a solitary star located in the southern constellation Antlia. The star has an absolute magnitude of 0^[2] and an apparent magnitude of 5.61,^[2] making it faintly visible to the naked eye under ideal conditions. The star is located 371 light years^[1] away based on its parallax shift and is drifting closer with a helocentric radial velocity of −9.6 km/s.^[6]

This star has a classification of A1 V,^[4] which indicates that it is an ordinary A-type main-sequence star that is fusing hydrogen at its core. At present it has 2.78^[3] times the mass of the Sun but is large and over luminous for its class with 3.89^[7] times and 101^[3] times the radius and luminosity of the Sun respectively. This is because HD 93905 has already completed most of its main sequence lifetime at an age of 256 million years.^[3] HD 93905 has a surface temperature of 8,895 K^[3] and spins quickly with a projected rotational velocity of 85 km/s.^[9]

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. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. ISSN 1063-7737. S2CID 119257644.
3. Zorec, J.; Royer, F. (January 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. ISSN 0004-6361.
4. Houk, N. (1982). Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Volume_3. Declinations -40_ƒ0 to -26_ƒ0. Bibcode:1982mcts.book.....H.
5. Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.
6. Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. ISSN 1063-7737. S2CID 119231169.
7. McDonald, I.; Zijlstra, A. A.; Watson, R. A. (11 October 2017). "Fundamental parameters and infrared excesses of Tycho–Gaia stars". Monthly Notices of the Royal Astronomical Society. 471 (1): 770–791. arXiv:1706.02208. Bibcode:2017MNRAS.471..770M. doi:10.1093/mnras/stx1433. ISSN 0035-8711.
8. Anders, F.; et al. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy & Astrophysics. 628: A94. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. ISSN 0004-6361.
9. Royer, F.; Zorec, J.; Gómez, A. E. (February 2007). "Rotational velocities of A-type stars: III. Velocity distributions". Astronomy & Astrophysics. 463 (2): 671–682. arXiv:astro-ph/0610785. Bibcode:2007A&A...463..671R. doi:10.1051/0004-6361:20065224. ISSN 0004-6361.