HD 49878

HD 49878 (or 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]

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[1] mas
Distance184 ± 2 ly
(56.3 ± 0.7 pc)
Absolute magnitude (MV)0.80[5]
Details
Mass1.24±0.22[6] M☉
Radius18.68+0.34
−0.79[7] R☉
Luminosity94.2±1.5[7] L☉
Surface gravity (log g)2.11[2] cgs
Temperature4,160+91
−38[7] K
Metallicity [Fe/H]0.05[2] dex
Rotational velocity (v sin i)1.4[8] km/s
Age4.817±2.347 Gyr
Other designations
BD+77°266, FK5 260, GC 9073, HD 49878, HIP 33694, HR 2527, SAO 6022[9]
Database references
SIMBADdata

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. 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.
  2. 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.
  3. Eggen, O. J. (1962), "Space-velocity vectors for 3483 stars with proper motion and radial velocity", Royal Observatory Bulletin, 51, Bibcode:1962RGOB...51...79E.
  4. 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, A61.
  5. 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.
  6. Dollinger, M. P. (2008), Hunting for extrasolar planets around K giants (PDF), Ludwig-Maximilians-Universität München, retrieved 2020-01-04.
  7. 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.
  8. 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.
  9. "HD 49878". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-06-06.
  10. 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.
  11. 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.
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