56 Ursae Majoris

56 Ursae Majoris (56 UMa) is a star in the constellation Ursa Major. Its apparent magnitude is 5.03.[2] It is a single-lined spectroscopic binary with an orbital period of about 45 years.[5]

56 Ursae Majoris

Observation data Epoch J2000      Equinox J2000
Constellation	Ursa Major
Right ascension	11^h 22^m 49.58373^s[1]
Declination	+43° 28′ 57.7267″[1]
Apparent magnitude (V)	5.03[2]
Characteristics
Spectral type	G7IIIBa0.3[3]
U−B color index	+0.82[4]
B−V color index	+1.02[4]
Astrometry
Radial velocity (Rv)	1.01 ± 0.05[5] km/s
Proper motion (μ)	RA: -37.42[1] mas/yr Dec.: -14.26[1] mas/yr
Parallax (π)	6.12 ± 0.27[1] mas
Distance	530 ± 20 ly (163 ± 7 pc)
Orbit[5]
Period (P)	16460 ± 631 d
Eccentricity (e)	0.555 ± 0.016
Periastron epoch (T)	2451521 ± 35
Argument of periastron (ω) (secondary)	286.8 ± 2.0°
Semi-amplitude (K1) (primary)	3.84 ± 0.04 km/s
Other designations
BD+44° 2083, FK5 2908, HD 98839, HIP 55560, HR 4392, SAO 43719
Database references
SIMBAD	data

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. Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
3. Lu, Phillip K. (1991). "Taxonomy of barium stars". Astronomical Journal. 101: 2229–2254. Bibcode:1991AJ....101.2229L. doi:10.1086/115845.
4. Fernie, J. D. (1983). "New UBVRI photometry for 900 supergiants". Astrophysical Journal Supplement Series. 52 (7–22). Bibcode:1983ApJS...52....7F. doi:10.1086/190856.
5. Pourbaix, D.; et al. (2004). "S_B⁹: The ninth catalogue of spectroscopic binary orbits". Astronomy and Astrophysics. 424 (2): 727. arXiv:astro-ph/0406573. Bibcode:2004A&A...424..727P. doi:10.1051/0004-6361:20041213.