H Scorpii
{{Short description|Star in the constellation Scorpius}}
{{Starbox begin}}
{{Starbox image
| image = 250px
| caption = H Scorpii and the dark clouds Barnard 231
| credit = DECaPS DR2
}}
{{Starbox observe
| epoch = J2000.0
| constell = Scorpius
| dec = {{DEC|-35|15|19.1803}}
}}
{{Starbox character
| variable =
}}
{{Starbox astrometry
| prop_mo_ra = 15.61{{±|0.17}}
| prop_mo_dec = 11.33{{±|0.14}}
| parallax = 9.52
| p_error = 0.16
}}
{{Starbox detail
| mass = {{val|1.06|0.74|0.28|ul=Solar mass}}
1.81
| luminosity = {{val|389|u=Solar luminosity}}
{{val|562|u=Solar luminosity}}
582{{±|147}}
| temperature = {{val|3875|21|fmt=commas}}
| metal_fe = {{val|0.00|0.20|u=dex}}
−0.30
| rotation =
}}
{{Starbox catalog
| names = {{odlist | B=H Sco | HR=6166 | CD=-34° 11112 | HD=149447 | HIP=81304 | SAO=207814 | NSV=7844 | PPM=295235 | GC=22311 }}
}}
{{Starbox reference
| Simbad = H+Sco
}}
{{Starbox end}}
H Scorpii (H Sco) is a single star in the southern constellation Scorpius. It is faintly visible to the naked eye with an apparent visual magnitude of 4.18. The star is located at a distance of approximately 343 light-years from the Sun based on parallax measurements, but is drifting closer with a radial velocity of −2 km/s. This star was initially given the Bayer designation Beta Normae by Lacaille but it was later reassigned from Norma to Scorpius.
This is an aging giant star with a stellar classification of K6III. After exhausting the supply of hydrogen at its core, this star cooled and expanded off the main sequence. It now has around 53 times the radius of the Sun. The star is about 2.2 billion years old with only a mild level of magnetic activity, and is spinning with a projected rotational velocity of 3.1 km/s. It is radiating 4–600 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,875 K.
References
{{reflist|refs=
| title=H Sco | access-date=2021-11-12 }}
| last1=Anderson | first1=E. | last2=Francis | first2=Ch.
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| bibcode=2013AJ....146...73P | s2cid=119187733 }}
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}}
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| doi=10.1051/0004-6361/201936360| arxiv=1910.12732
| bibcode=2020A&A...633A..34C | s2cid=204907220
| issn=0004-6361 }}
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| bibcode=2015AJ....150...88L | doi=10.1088/0004-6256/150/3/88
| arxiv=1507.01466 | s2cid=118505114 }}
| title=ISO-SWS calibration and the accurate modelling of cool-star atmospheres. IV. G9 to M2 stars
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| display-authors=1 | journal=Astronomy and Astrophysics
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| issue=2 | doi=10.1051/0004-6361:20021786 | arxiv=astro-ph/0207653
| bibcode=2003A&A...400..709D | s2cid=55244849 }}
| title=Michigan catalogue of two-dimensional spectral types for the HD stars
| volume=3 | year=1979 | last1=Houk | first1=Nancy
| location=Ann Arbor, Michigan
| publisher=Dept. of Astronomy, University of Michigan
| bibcode=1982mcts.book.....H }}
| last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A.
| title=A catalogue of multiplicity among bright stellar systems
| journal=Monthly Notices of the Royal Astronomical Society
| volume=389 | issue=2 | pages=869–879 | date=September 2008
| doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | s2cid=14878976
| bibcode=2008MNRAS.389..869E | arxiv=0806.2878 }}
| last=Gontcharov | first=G. A.
| title=Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system
| journal=Astronomy Letters
| volume=32| issue=11| pages=759–771| date=November 2006
| doi=10.1134/S1063773706110065 | arxiv=1606.08053
| bibcode=2006AstL...32..759G | s2cid=119231169 }}
| title=The non-active stellar chromosphere: Ca II basal flux
| display-authors=1 | last1=Pérez Martínez | first1=M. I.
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| journal=Monthly Notices of the Royal Astronomical Society
| volume=445 | issue=1 | pages=270–279 | date=November 2014
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| title=Norma, the Set Square
| website=Ian Ridpath's Star Tales
| first=Ian | last=Ridpath | date=June 28, 2018
| url=http://www.ianridpath.com/startales/norma.html
| access-date=2021-11-13 }}
}}
{{Stars of Scorpius}}