13 Scorpii

{{Short description|Star in the constellation Scorpius}}

{{about|c² Scorpii|other stars with this Bayer designation|c Scorpii}}

{{Starbox begin

|name=13 Scorpii}}

{{Starbox observe

|constell=Scorpius

|epoch=J2000

|ra={{RA|16|12|18.20490}}{{cite journal|title=Validation of the new Hipparcos reduction|author1=van Leeuwen, F.|display-authors=etal|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|-27|55|34.9457}}

|appmag_v=+4.568{{cite journal|title=The Tycho-2 catalogue of the 2.5 million brightest stars|author=Høg, E.|display-authors=etal|date=2000|journal=Astronomy and Astrophysics|volume=355|pages=L27–L30|bibcode=2000A&A...355L..27H}}

}}

{{Starbox character

|class=B2V{{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}}

|b-v=−0.16{{cite journal|title=UBVRIJKL Photometry of the Bright Stars|author1=Johnson, H. L.|journal=Communications of the Lunar and Planetary Laboratory|volume=4|pages=99|date=1966|bibcode=1966CoLPL...4...99J}}

|u-b=−0.74

|variable=

}}

{{Starbox astrometry

|radial_v=0 ± 5{{cite conference|title=The Revision of the General Catalogue of Radial Velocities|last=Evans|first=D. S.|date=1967|book-title=Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30 held at the University of Toronto 20-24 June, 1966|editor=Alan Henry Batten|editor2=John Frederick Heard|series= International Astronomical Union|volume=30|publisher=Academic Press|publication-place=London|page=57|bibcode=1967IAUS...30...57E}}

|prop_mo_ra=−10.38

|prop_mo_dec=−23.94

|parallax=6.81

|p_error=0.16

|parallax_footnote=

|absmag_v=−1.25{{cite journal | last1 = Anderson | first1 = E. | last2 = Francis | first2 = Ch. | title = XHIP: An extended hipparcos compilation | journal = Astronomy Letters | date = May 2012 | volume = 38 | issue = 5 | pages = 331–346 | issn = 1063-7737 | eissn = 1562-6873 | doi = 10.1134/S1063773712050015 | bibcode = 2012AstL...38..331A | arxiv = 1108.4971| s2cid = 119257644 }}

}}

{{Starbox orbit

|reference=

|period_unitless=5.7805 d

|periastron=JD 2443298.40

|eccentricity=0.19

|periarg=115

|k1=31.5

}}

{{Starbox detail

|component1=13 Sco A

|rotational_velocity=165{{cite journal|title=B Star Rotational Velocities in h and χ Persei: A Probe of Initial Conditions during the Star Formation Epoch?|author1=Strom, S. E.|author2=Wolff, S. C.|author3=Dror, D. H. A.|journal=The Astronomical Journal|volume=129|issue=2|pages=809–828|date=2005|bibcode=2005AJ....129..809S|doi=10.1086/426748|arxiv=astro-ph/0410337|s2cid=15059129}}

|mass=7.80{{cite journal|title=SPOTS: The Search for Planets Orbiting Two Stars. II. First constraints on the frequency of sub-stellar companions on wide circumbinary orbits|author=Bonavita, M.|display-authors=etal|journal=Astronomy & Astrophysics|volume=593|pages=A38|date=2016|bibcode=2016A&A...593A..38B|doi=10.1051/0004-6361/201628231|arxiv=1605.03962|s2cid=55950739}}

|age_myr=11

|temperature=24000{{cite journal|title=Herbig Ae/Be Stars in nearby OB Associations|author1=Hernández, J.|author2=Calvet, N.|author2-link=Nuria Calvet|author3=Hartmann, L.|author4=Briceño, C.|author5=Sicilia-Aguilar, A.|author6=Berlind, P.|journal=The Astronomical Journal|volume=129|issue=2|pages=856–871|date=2005|bibcode=2005AJ....129..856H|doi=10.1086/426918|arxiv=astro-ph/0410494|s2cid=17672346}}

|luminosity=3020

|component2=13 Sco B

|mass2=1.12

}}

{{Starbox catalog

|names={{odlist|B=c² Sco|F=13 Sco|CD=−27° 10841|HD=145482|HIP=79404|HR=6028|SAO=184221}}{{cite simbad|title=* c02 Sco|access-date=10 April 2017}}

}}

{{Starbox reference

|Simbad=13+Sco

}}

{{Starbox end}}

13 Scorpii, also known by its Bayer designation c² Scorpii, is a binary star in the constellation Scorpius. Its apparent magnitude is 4.57, meaning it can be faintly seen with the naked eye. Based on parallax estimates made by the Hipparcos spacecraft, the system is located about 480 light-years (147 parsecs) away. It is located within the Upper Scorpius subgroup of the Scorpius–Centaurus association.

13 Scorpii is a spectroscopic binary, meaning the two stars are too close to be individually resolved, but periodic Doppler shifts in the star's spectrum indicate there must be orbital motion. In this case, light from only one of its stars can be detected and it is a double-lined spectroscopic binary. The two have an orbital period of 5.7805 days and an eccentricity of 0.19. The primary star, at 11 million years old, is a B-type main-sequence star with a spectral type of B2V. While the primary's mass is estimated to be about {{solar mass|7.8}}, its companion is thought to have a mass of {{solar mass|1.12}}.