56 Ursae Majoris

{{short description|Star in the constellation Ursa Major}}

{{Starbox begin|name=56 Ursae Majoris}}

{{Starbox observe

|epoch=J2000

|constell=Ursa Major

|ra={{RA|11|22|49.58373}}{{cite journal|title=Validation of the new Hipparcos reduction|url=http://www.aanda.org/index.php?option=com_article&access=bibcode&Itemid=129&bibcode=2007A%2526A...474..653VFUL|author=van Leeuwen, F. |journal=Astronomy and Astrophysics|volume=474|issue=2|pages=653–664|date=2007|arxiv=0708.1752|bibcode=2007A&A...474..653V|doi=10.1051/0004-6361:20078357|s2cid = 18759600}}

|dec={{DEC|+43|28|57.7267}}

|appmag_v=5.03{{cite journal|bibcode=2002yCat.2237....0D|title=VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system|journal=CDS/ADC Collection of Electronic Catalogues|volume=2237|author1=Ducati, J. R.|year=2002}}

}}

{{Starbox character

|class=G7IIIBa0.3{{cite journal|bibcode=1991AJ....101.2229L|title=Taxonomy of barium stars|author=Lu, Phillip K.|journal=Astronomical Journal|volume=101|pages=2229–2254|date=1991|doi=10.1086/115845|doi-access=free}}

|b-v=+1.02{{cite journal|bibcode=1983ApJS...52....7F|doi=10.1086/190856|title=New UBVRI photometry for 900 supergiants|author=Fernie, J. D.|journal=Astrophysical Journal Supplement Series|volume=52|issue=7–22|date=1983|page=7|doi-access=free}}

|u-b=+0.82

}}

{{Starbox astrometry

|radial_v=1.01 ± 0.05{{cite journal|title=S_B⁹: The ninth catalogue of spectroscopic binary orbits|display-authors=1|author1=Pourbaix, D.|author2=Tokovinin, A. A.|author3=Batten, A. H.|author4=Fekel, F. C.|author5=Hartkopf, W. I.|author6=Levato, H.|author7=Morrell, N. I.|author8=Torres, G.|author9=Udry, S.|journal=Astronomy and Astrophysics|volume=424|issue=2|pages=727–732|year=2004|doi=10.1051/0004-6361:20041213|arxiv=astro-ph/0406573|bibcode=2004A&A...424..727P|s2cid=119387088}}

|prop_mo_ra=-37.42

|prop_mo_dec=-14.26

|parallax=6.12

|p_error=0.27

|parallax_footnote=

}}

{{Starbox orbit

|reference=

|period_unitless={{val|16911|438|401}} d

|periastron={{val|2468401|432|385}}

|eccentricity={{val|0.562|0.012|0.012}}

|axis_unitless={{val|22.9|1.0|1.1}} au

|periarg={{val|286|2.3|2.3}}

|node={{val|60|3|3}}

|inclination={{val|68|3.6|3.4}}

}}

{{Starbox detail

|source=

|component1=56 UMa A

|mass=4.3 ± 0.2

|temperature=4917 ± 34

|gravity=2.3 ± 0.6

|metal_fe−0.05

|component2=56 UMa B

|mass2={{val|1.31|0.11|0.12}}

}}

{{Starbox catalog

|names={{odlist|BD=+44° 2083|FK5=2908|HD=98839|HIP=55560|HR=4392|SAO=43719}}

}}

{{Starbox reference

|Simbad=56+UMa

}}

{{Starbox end}}

56 Ursae Majoris (56 UMa) is a star in the constellation Ursa Major. Its apparent magnitude is 5.03. It is a single-lined spectroscopic binary with an orbital period of about 45 years. The companion star is likely a heavy neutron star born by a supernova that exploded around 100,000 years ago.{{cite journal| arxiv=2301.06531 |title = A neutron star candidate in the long-period binary 56 UMa| bibcode=2023A&A...670L..14E | last1=Escorza | first1=A. | last2=Karinkuzhi | first2=D. | last3=Jorissen | first3=A. | last4=Van Eck | first4=S. | last5=Schmelz | first5=J. T. | last6=Verschuur | first6=G. L. | last7=Boffin | first7=H. M. J. | last8=De Rosa | first8=R. J. | last9=Van Winckel | first9=H. | journal=Astronomy and Astrophysics | year=2023 | volume=670 | pages=L14 | doi=10.1051/0004-6361/202245796 | s2cid=255941814 }}