Astronomy:HD 49878
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Camelopardalis |
| Right ascension | 07h 00m 04.03561s[1] |
| Declination | +76° 58′ 38.6618″[1] |
| Apparent magnitude (V) | +4.551[2] |
| Characteristics | |
| Spectral type | K4 III[3] |
| B−V color index | 1.399[2] |
| Astrometry | |
| Radial velocity (Rv) | −29.47±0.19[4] km/s |
| Proper motion (μ) | RA: +72.48[1] mas/yr Dec.: −14.54[1] mas/yr |
| Parallax (π) | 17.75 ± 0.23[1] mas |
| Distance | 184 ± 2 ly (56.3 ± 0.7 pc) |
| Absolute magnitude (MV) | 0.80[5] |
| Details | |
| Mass | 1.24±0.22[6] M☉ |
| Radius | 18.68+0.34 −0.79[7] R☉ |
| Luminosity | 94.2±1.5[7] L☉ |
| Surface gravity (log g) | 2.11[2] cgs |
| Temperature | 4,160+91 −38[7] K |
| Metallicity [Fe/H] | 0.05[2] dex |
| Rotational velocity (v sin i) | 1.4[8] km/s |
| Age | 4.817±2.347 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 49878 is a single[10] star in the northern circumpolar constellation of Camelopardalis. It has an orange hue and is faintly visible to the naked eye with an apparent visual magnitude of +4.55.[2] The star is located at a distance of approximately 184 light years from the Sun, as determined from its parallax.[1] It is drifting closer with a radial velocity of −29.5 km/s.[4] The star has been listed as a candidate member of the Wolf 630 moving group, but is most likely a field star.[11]
This is an aging giant star with a stellar classification of K4 III,[3] having exhausted the supply of hydrogen at its core and expanded to 19[7] times the Sun's radius. It is roughly 5[6] billion years old with 1.2[6] times the mass of the Sun. The star is radiating 94[7] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,160 K.[7] It is spinning slowly with a projected rotational velocity of 1.4 km/s.[8]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
- ↑ 2.0 2.1 2.2 2.3 2.4 Soubiran, C. et al. (June 2010), "The PASTEL catalogue of stellar parameters", Astronomy and Astrophysics 515: A111, doi:10.1051/0004-6361/201014247, Bibcode: 2010A&A...515A.111S.
- ↑ 3.0 3.1 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.
- ↑ 4.0 4.1 de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics 546: 14, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D.
- ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 6.0 6.1 6.2 Dollinger, M. P. (2008), Hunting for extrasolar planets around K giants, Ludwig-Maximilians-Universität München, Bibcode: 2008PhDT.......232D, https://edoc.ub.uni-muenchen.de/9970/1/Doellinger_Michaela.pdf, retrieved 2020-01-04.
- ↑ 7.0 7.1 7.2 7.3 7.4 7.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 8.0 8.1 De Medeiros, J. R. et al. (November 2000), "Rotation and lithium in single giant stars", Astronomy and Astrophysics 363: 239–243, Bibcode: 2000A&A...363..239D.
- ↑ "HD 49878". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+49878.
- ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ McDonald, A. R. E.; Hearnshaw, J. B. (August 1983), "The Wolf 630 moving group of stars", Monthly Notices of the Royal Astronomical Society 204 (3): 841–852, doi:10.1093/mnras/204.3.841, Bibcode: 1983MNRAS.204..841M.
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