63 Ophiuchi

{{short description|Star in the constellation Sagittarius}}

{{Starbox begin}}

{{Starbox observe

| epoch = J2000.0 (ICRS)

| constell = Sagittarius

| ra = {{RA|17|54|54.04315}}{{Cite Gaia DR2|4067435566661212672}}

| dec = {{DEC|−24|53|13.5444}}

| appmag_v = 6.20{{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|last1=Ducati|first1=J. R.|year=2002}}

}}

{{Starbox character

| class = O8II((f)){{cite journal|bibcode=2014ApJS..211...10S|arxiv=1312.6222|title=The Galactic O-Star Spectroscopic Survey (GOSSS). II. Bright Southern Stars|journal=The Astrophysical Journal Supplement|volume=211|pages=10|last1=Sota|first1=A.|last2=Maíz Apellániz|first2=J.|last3=Morrell|first3=N. I.|author-link3=Nidia Morrell|last4=Barbá|first4=R. H.|last5=Walborn|first5=N. R.|last6=Gamen|first6=R. C.|last7=Arias|first7=J. I.|last8=Alfaro|first8=E. J.|year=2014|issue=1|doi=10.1088/0067-0049/211/1/10|s2cid=118847528}}

| b-v = +0.04

| u-b = –0.89

| variable =

}}

{{Starbox astrometry

| radial_v = –11

| prop_mo_ra = +0.704

| prop_mo_dec = –2.194

| parallax = 0.9071

| p_error = 0.0882

| parallax_footnote =

| dist_ly =

| dist_pc =

| absmag_v = −6.0{{cite journal|bibcode= 2004A&A...428..149S|title= On the Hipparcos parallaxes of O stars|journal= Astronomy and Astrophysics|volume= 428|pages= 149–157|last1= Schröder|first1= S. E.|last2= Kaper|first2= L.|last3= Lamers|first3= H. J. G. L. M.|last4= Brown|first4= A. G. A.|year= 2004|doi= 10.1051/0004-6361:20047185|arxiv = astro-ph/0408370 |s2cid= 55115943}}

}}

{{Starbox detail

| temperature=34,000{{cite journal|bibcode=2015A&A...575A..34M|arxiv=1411.4420|title=The MiMeS survey of magnetism in massive stars: CNO surface abundances of Galactic O stars|journal=Astronomy & Astrophysics|volume=575|pages=A34|last1=Martins|first1=F.|last2=Hervé|first2=A.|last3=Bouret|first3=J.-C.|last4=Marcolino|first4=W.|last5=Wade|first5=G. A.|last6=Neiner|first6=C.|last7=Alecian|first7=E.|last8=Grunhut|first8=J.|last9=Petit|first9=V.|year=2015|doi=10.1051/0004-6361/201425173|s2cid=119258285}}

| gravity=3.5

| rotational_velocity=35-86

}}

{{Starbox catalog

|names={{odlist|F=63 Oph|CD=-24° 13615|HD=162978|HIP=87706|HR=6672|SAO=185928}}

}}

{{Starbox reference

|Simbad=63+Oph

}}

{{Starbox end}}

63 Ophiuchi is an O-type giant star in the constellation Sagittarius, despite its name. During a 2009 survey for companions of massive stars, it was observed using speckle interferometry but no companion was found. The small parallax measurement of {{val|0.91|0.09|ul=mas}} suggest that this extremely luminous star may be located about 3,600 light-years away. An estimate of the distance based on the strength of the Ca II line yields a more modest value of {{Convert|2605|ly|pc|abbr=on}}. The star lies only 0.3° north of the galactic plane.

In 1983, astronomers from the Sternberg Astronomical Institute in Moscow, Russia identified a faint, shell-shaped nebula surrounding the star that was being excited by the star's energy. Named Sharpless 22, this ring-shaped nebula has a double-shell structure with an inner envelope spanning 45–50′ (9–18 pc), surrounded by a diffuse envelope some 65–80′ (14–29 pc) across. At an estimated mass loss rate of {{nowrap|(6–8) × 10⁻⁶ {{Solar mass|link=y}}/yr}}, it would take the star about {{nowrap|(1–5) × 10⁵ years}} to produce such a nebula from the outflow of its stellar wind.