HD 49878
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| 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 mas[1] |
| Distance | 184 ± 2 ly (56.3 ± 0.7 pc) |
| Absolute magnitude (MV) | 0.80[5] |
| Details | |
| Mass | 1.239±0.217[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[6] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 49878 (M Camelopardalis) 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 times the Sun's radius.[7] It is roughly 5 billion years old with 1.24 times the mass of the Sun.[6] The star is radiating 94 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[edit]
- ^ a b c d e f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
- ^ a b c d e Soubiran, C.; et al. (June 2010), "The PASTEL catalogue of stellar parameters", Astronomy and Astrophysics, 515: A111, arXiv:1004.1069, Bibcode:2010A&A...515A.111S, doi:10.1051/0004-6361/201014247, S2CID 118362423.
- ^ a b 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.
- ^ a b 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, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
- ^ 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.
- ^ a b c Dollinger, M. P. (2008), Hunting for extrasolar planets around K giants (PDF), Ludwig-Maximilians-Universität München, Bibcode:2008PhDT.......232D, retrieved 2020-01-04.
- ^ a b c d e 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.
- ^ a b De Medeiros, J. R.; et al. (November 2000), "Rotation and lithium in single giant stars", Astronomy and Astrophysics, 363: 239–243, arXiv:astro-ph/0010273, Bibcode:2000A&A...363..239D.
- ^ "HD 49878". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-06-06.
- ^ 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, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
- ^ 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, Bibcode:1983MNRAS.204..841M, doi:10.1093/mnras/204.3.841.
