| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Auriga |
| Right ascension | 05 19 23.75342 |
| Declination | +33° 59′ 07.4035″ |
| Apparent magnitude (V) | 6.489 |
| Characteristics | |
| Spectral type | A7 V |
| U−B color index | +0.09 |
| B−V color index | +0.256±0.007 |
| Astrometry | |
| Radial velocity (Rv) | 7.3±2 km/s |
| Proper motion (μ) | RA: +28.497 mas/yr Dec.: −12.714 mas/yr |
| Parallax (π) | 14.0275 ± 0.0668 mas |
| Distance | 233 ± 1 ly (71.3 ± 0.3 pc) |
| Absolute magnitude (MV) | 2.31 |
| Details | |
| Mass | 1.69±0.03 M☉ |
| Radius | 1.92+0.12 −0.03 R☉ |
| Luminosity | 10.091±0.063 L☉ |
| Surface gravity (log g) | 4.26±0.14 cgs |
| Temperature | 7,432+231 −67 K |
| Rotational velocity (v sin i) | 124 km/s |
| Age | 950 Myr |
| Other designations | |
| 18 Aur, BD+33°1010, GC 6504, HD 34499, HIP 24832, HR 1734, SAO 57893, ADS 3893, WDS J05194+3359 | |
| Database references | |
| SIMBAD | data |
18 Aurigae is a star located 233 light years away from the Sun in the northern constellation of Auriga. The brightness of this object is near the limit of visibility to the naked eye under good viewing conditions, appearing as a dim, white-hued star with an apparent visual magnitude of 6.49. The star is moving away from the Sun with a heliocentric radial velocity of 7 km/s.
This is an ordinary A-type main-sequence star with a stellar classification of A7 V, which indicates it is generating energy by hydrogen fusion at its core. The object is 950 million years old with a high rate of spin, showing a projected rotational velocity of 124 km/s. It has 1.7 times the mass of the Sun and 1.9 times the Sun's radius. The star is radiating 10 times the luminosity of the Sun from its photosphere at an effective temperature of 7,432 K.
18 Aurigae has a magnitude 12.50 companion star at an angular separation of 3.90″ along a position angle of 167°, as of 2006.
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.
- ^ Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27 – L30. Bibcode:2000A&A...355L..27H.
- ^ Cowley, A.; Cowley, C.; Jaschek, M.; Jaschek, C. (1969). "A study of the bright stars. I. A catalogue of spectral classifications". The Astronomical Journal. 74: 375. Bibcode:1969AJ.....74..375C. doi:10.1086/110819.
- Deutschman, W. A.; Davis, R. J.; Schild, R. E. (1976). "The galactic distribution of interstellar absorption as determined from the Celescope catalog of ultraviolet stellar observations and a new catalog of UBV, H-beta photoelectric observations". The Astrophysical Journal Supplement Series. 30: 97. Bibcode:1976ApJS...30...97D. doi:10.1086/190359.
- ^ 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.
- ^ Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Washington. Bibcode:1953GCRV..C......0W.
- ^ 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.
- ^ 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.
- ^ "18 Aur". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-05-21.
- 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.
External links
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