Location of HD 93905 (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Antlia |
| Right ascension | 10 49 57.0188 |
| Declination | −34° 03′ 29.4506″ |
| Apparent magnitude (V) | 5.61 |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | A1 V |
| U−B color index | +0.05 |
| B−V color index | +0.04 |
| Astrometry | |
| Radial velocity (Rv) | −9.5±1.3 km/s |
| Proper motion (μ) | RA: −41.069 mas/yr Dec.: +5.845 mas/yr |
| Parallax (π) | 8.7989 ± 0.1617 mas |
| Distance | 371 ± 7 ly (114 ± 2 pc) |
| Absolute magnitude (MV) | 0.00 |
| Details | |
| Mass | 2.78±0.05 M☉ |
| Radius | 3.89 R☉ |
| Luminosity | 101±9 L☉ |
| Surface gravity (log g) | 3.77 cgs |
| Temperature | 8995+125 −123 K |
| Rotational velocity (v sin i) | 85 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 and an apparent magnitude of 5.61, making it faintly visible to the naked eye under ideal conditions. The star is located 371 light years away based on its parallax shift and is drifting closer with a helocentric radial velocity of −9.6 km/s.
This star has a classification of A1 V, 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 times the mass of the Sun but is large and over luminous for its class with 3.89 times and 101 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. HD 93905 has a surface temperature of 8,895 K and spins quickly with a projected rotational velocity of 85 km/s.
References
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- 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.
- ^ 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.
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