56 Ursae Majoris

56 Ursae Majoris
Observation data; Epoch J2000 Equinox J2000
Constellation	Ursa Major
Right ascension	11h 22m 49.58373s
Declination	+43° 28′ 57.7267″
Apparent magnitude (V)	5.03
Characteristics
Spectral type	G7IIIBa0.3
U−B color index	+0.82
B−V color index	+1.02
Astrometry
Radial velocity (Rv)	1.01 ± 0.05 km/s
Proper motion (μ)	RA: -37.42 mas/yr ; Dec.: -14.26 mas/yr
Parallax (π)	6.12 ± 0.27 mas
Distance	530 ± 20 ly ; (163 ± 7 pc)
Orbit
Period (P)	16911+438; −401 d
Semi-major axis (a)	22.9+1.0; −1.1 au
Eccentricity (e)	0.562+0.012; −0.012
Inclination (i)	68+3.6; −3.4°
Longitude of the node (Ω)	60+3; −3°
Periastron epoch (T)	2468401+432; −385
Argument of periastron (ω); (secondary)	286+2.3; −2.3°
Details
56 UMa A
Mass	4.3 ± 0.2 M☉
Surface gravity (log g)	2.3 ± 0.6 cgs
Temperature	4917 ± 34 K
56 UMa B
Mass	1.31+0.11; −0.12 M☉
Other designations
	BD+44° 2083, FK5 2908, HD 98839, HIP 55560, HR 4392, SAO 43719
Database references
SIMBAD	data

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] The companion star is likely a heavy neutron star born by a supernova that exploded around 100,000 years ago.^[6]

References

^ ^a ^b ^c ^d ^e 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 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.
^ Lu, Phillip K. (1991). "Taxonomy of barium stars". Astronomical Journal. 101: 2229–2254. Bibcode:1991AJ....101.2229L. doi:10.1086/115845.
^ ^a ^b Fernie, J. D. (1983). "New UBVRI photometry for 900 supergiants". Astrophysical Journal Supplement Series. 52 (7–22): 7. Bibcode:1983ApJS...52....7F. doi:10.1086/190856.
^ ^a ^b Pourbaix, D.; et al. (2004). "S_B⁹: The ninth catalogue of spectroscopic binary orbits". Astronomy and Astrophysics. 424 (2): 727–732. arXiv:astro-ph/0406573. Bibcode:2004A&A...424..727P. doi:10.1051/0004-6361:20041213. S2CID 119387088.
^ ^a ^b ^c Escorza, A.; Karinkuzhi, D.; Jorissen, A.; Van Eck, S.; Schmelz, J. T.; Verschuur, G. L.; Boffin, H. M. J.; De Rosa, R. J.; Van Winckel, H. (2023). "A neutron star candidate in the long-period binary 56 UMa". Astronomy and Astrophysics. 670: L14. arXiv:2301.06531. Bibcode:2023A&A...670L..14E. doi:10.1051/0004-6361/202245796. S2CID 255941814.

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[HIP-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. S2CID 18759600.

[Ducati-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.

[Fernie-4] Fernie, J. D. (1983). "New UBVRI photometry for 900 supergiants". Astrophysical Journal Supplement Series. 52 (7–22): 7. Bibcode:1983ApJS...52....7F. doi:10.1086/190856.

[SB9-5] Pourbaix, D.; et al. (2004). "S_B⁹: The ninth catalogue of spectroscopic binary orbits". Astronomy and Astrophysics. 424 (2): 727–732. arXiv:astro-ph/0406573. Bibcode:2004A&A...424..727P. doi:10.1051/0004-6361:20041213. S2CID 119387088.

[Escorza-6] Escorza, A.; Karinkuzhi, D.; Jorissen, A.; Van Eck, S.; Schmelz, J. T.; Verschuur, G. L.; Boffin, H. M. J.; De Rosa, R. J.; Van Winckel, H. (2023). "A neutron star candidate in the long-period binary 56 UMa". Astronomy and Astrophysics. 670: L14. arXiv:2301.06531. Bibcode:2023A&A...670L..14E. doi:10.1051/0004-6361/202245796. S2CID 255941814.

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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 (R_v)	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 mas^[1]
Distance	530 ± 20 ly (163 ± 7 pc)

Orbit^[6]
Period (P)	16911+438 −401 d
Semi-major axis (a)	22.9+1.0 −1.1 au
Eccentricity (e)	0.562+0.012 −0.012
Inclination (i)	68+3.6 −3.4°
Longitude of the node (Ω)	60+3 −3°
Periastron epoch (T)	2468401+432 −385
Argument of periastron (ω) (secondary)	286+2.3 −2.3°
Details^[6]
56 UMa A
Mass	4.3 ± 0.2 `M`_☉
Surface gravity (log g)	2.3 ± 0.6 cgs
Temperature	4917 ± 34 K
56 UMa B
Mass	1.31+0.11 −0.12 `M`_☉
Other designations
BD+44° 2083, FK5 2908, HD 98839, HIP 55560, HR 4392, SAO 43719
Database references
SIMBAD	data