78 Ursae Majoris
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Ursa Major |
Right ascension | 13h 00m 43.69949s[1] |
Declination | +56° 21′ 58.8102″[1] |
Apparent magnitude (V) | 4.93[2] (5.02 / 7.88)[3] |
Characteristics | |
Evolutionary stage | F2V[4] |
U−B color index | +0.00[5] |
B−V color index | +0.34[5] |
Astrometry | |
Radial velocity (Rv) | ±0.9 −9.8[6] km/s |
Proper motion (μ) | RA: 107.94[1] mas/yr Dec.: 2.05[1] mas/yr |
Parallax (π) | 39.30 ± 0.38[1] mas |
Distance | 83.0 ± 0.8 ly (25.4 ± 0.2 pc) |
Absolute magnitude (MV) | +2.84[7] |
Orbit[8] | |
Period (P) | ±0.6 104.9yr |
Semi-major axis (a) | ±0.010″ 1.208 |
Eccentricity (e) | ±0.009 0.388 |
Inclination (i) | ±0.9 46.9° |
Longitude of the node (Ω) | ±1.1 88.0° |
Periastron epoch (T) | B 921.224±0.403 1 |
Argument of periastron (ω) (secondary) | ±1.5 119.2° |
Other designations | |
Database references | |
SIMBAD | The system |
A | |
B |
78 Ursae Majoris (78 UMa) is a binary star in the constellation Ursa Major. Its combined apparent magnitude is 4.93.[2] Parallax estimates by Hipparcos put it at 83 light-years, or 25.4 parsecs, away.[1]
References
- 1 2 3 4 5 6 van Leeuwen, F.; et al. (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.
- 1 2 3 "* 78 UMa". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 19 August 2017.
- ↑ Fabricius, C.; Høg, E.; Makarov, V. V.; Mason, B. D.; Wycoff, G. L.; Urban, S. E. (2002). "The Tycho double star catalogue". Astronomy and Astrophysics. 384: 180–189. Bibcode:2002A&A...384..180F. doi:10.1051/0004-6361:20011822.
- ↑ Gray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Robinson, P. E. (2003). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 Parsecs: The Northern Sample. I". The Astronomical Journal. 126 (4): 2048. arXiv:astro-ph/0308182. Bibcode:2003AJ....126.2048G. doi:10.1086/378365.
- 1 2 Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Bibcode:1986EgUBV........0M.
- ↑ Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Bibcode:1953GCRV..C......0W.
- ↑ Eggen, Olin J. (August 1998), "The Sirius Supercluster and Missing Mass near the Sun", The Astronomical Journal, 116 (2): 782–788, Bibcode:1998AJ....116..782E, doi:10.1086/300465.
- ↑ "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Retrieved 19 August 2017.
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