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{{about-distinguish|i Scorpii|iota Scorpii{{!}}ι Scorpii}}{{Starbox begin
| name = 22 Scorpii
}}{{Starbox observe
| epoch = J2000
| constell = Scorpius
| ra = {{RA|16|30|12.47514}}[1]
| dec = {{DEC|−25|06|54.8043}}[1]
| appmag_v = 4.78[3]
}}{{Starbox character
| class = B3 V[4]
| b-v =
| u-b =
| variable =
}}{{Starbox astrometry
| radial_v =
| prop_mo_ra = −4.45[1]
| prop_mo_dec = −26.33[1]
| parallax = 7.89
| p_error = 0.24
| parallax_footnote = [1]
| absmag_v = −0.72[8]
}}{{Starbox detail
| source =
| mass = {{Val|6.1|0.1}}[9]
| radius =
| luminosity = 334.57[8]
| gravity =
| temperature = 19,600[3]
| metal_fe =
| rotational_velocity = {{Val|169|4}}[3]
| age_myr = {{Val|10.5|2.1}}[9]
}}{{Starbox catalog
| names = {{odlist | B=i Sco | F=22 Sco | CD=-24° 12695 | HD=148605 | HIP=80815 | HR=6141 | SAO=184429 }}
}}{{Starbox reference
| Simbad = 22+Sco
}}{{Starbox end}}22 Scorpii (i Scorpii) is a single[15] star in the southern zodiac constellation of Scorpius. It is faintly visible to the naked eye with an apparent visual magnitude of 4.78.[3] The distance to this star can be estimated from its annual parallax shift of {{Val|7.89|0.24|ul=mas}},[1] which yields a value of around 410 light years. The star is embedded in, or adjacent to, a diffuse nebulous cloud.[18]This is a B-type main-sequence star with a stellar classification of B3 V.[4] It is ten[9] million years old and has a high rate of spin with a projected rotational velocity of 169 km/s.[3] The star has about six[9] times the mass of the Sun and is radiating 335[8] times the Sun's luminosity from its photosphere at an effective temperature of 19,600 K.[3] References1. ^1 2 3 4 5 6 {{citation | title=Validation of the new Hipparcos reduction | last1=van Leeuwen | first1=F. | postscript=. | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | year=2007 | arxiv=0708.1752 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 }}
2. ^1 2 3 {{citation | title=XHIP: An extended hipparcos compilation | last1=Anderson | first1=E. | last2=Francis | first2=Ch. | journal=Astronomy Letters | volume=38 | issue=5 | pages=331 | year=2012 | bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015 | arxiv=1108.4971 | postscript=. }}
3. ^1 {{citation | title=The Spitzer c2d Survey of Large, Nearby, Interstellar Clouds. VII. Ophiuchus Observed with MIPS | last1=Padgett | first1=Deborah L. | last2=Rebull | first2=Luisa M. | last3=Stapelfeldt | first3=Karl R. | last4=Chapman | first4=Nicholas L. | last5=Lai | first5=Shih-Ping | last6=Mundy | first6=Lee G. | last7=Evans | first7=Neal J., II | last8=Brooke | first8=Timothy Y. | last9=Cieza | first9=Lucas A. | last10=Spiesman | first10=William J. | last11=Noriega-Crespo | first11=Alberto | last12=McCabe | first12=Caer-Eve | last13=Allen | first13=Lori E. | last14=Blake | first14=Geoffrey A. | last15=Harvey | first15=Paul M. | last16=Huard | first16=Tracy L. | last17=Jørgensen | first17=Jes K. | last18=Koerner | first18=David W. | last19=Myers | first19=Philip C. | last20=Sargent | first20=Annelia I. | last21=Teuben | first21=Peter | last22=van Dishoeck | first22=Ewine F. | last23=Wahhaj | first23=Zahed | last24=Young | first24=Kaisa E. | journal=The Astrophysical Journal | display-authors=1 | volume=672 | issue=2 | id=1013–1037 | date=January 2008 | doi=10.1086/523883 | bibcode=2008ApJ...672.1013P | arxiv=0709.3492}}
4. ^1 2 {{citation | last1=Houk | first1=Nancy | last2=Smith-Moore | first2=M. | title=Michigan catalogue of two-dimensional spectral types for the HD stars | volume=4 | publication-place=Ann Arbor | year=1978 | publisher=Dept. of Astronomy, University of Michigan | bibcode=1988mcts.book.....H | postscript=. }}
5. ^1 2 3 4 {{citation | last1=Tetzlaff | first1=N. | last2=Neuhäuser | first2=R. | last3=Hohle | first3=M. M. | title=A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun | journal=Monthly Notices of the Royal Astronomical Society | volume=410 | issue=1 | pages=190–200 | date=January 2011 | doi=10.1111/j.1365-2966.2010.17434.x | bibcode=2011MNRAS.410..190T | postscript=. |arxiv = 1007.4883 }}
6. ^1 {{citation | 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 | bibcode=2008MNRAS.389..869E | postscript=. | arxiv=0806.2878 }}
7. ^1 2 3 4 5 6 {{citation | display-authors=1 | title=Projected Rotational Velocities and Stellar Characterization of 350 B Stars in the Nearby Galactic Disk | last1=Bragança | first1=G. A. | last2=Daflon | first2=S. | last3=Cunha | first3=K. | last4=Bensby | first4=T. | last5=Oey | first5=M. S. | last6=Walth | first6=G. | journal=The Astronomical Journal | date=November 2012 | volume=144 | issue=5 | id=130 | pages=10 | doi=10.1088/0004-6256/144/5/130 | bibcode=2012AJ....144..130B | postscript=. |arxiv = 1208.1674 }}
}}External links- {{cite web|title=22 Scorpii - Wolfram Alpha|url=http://www.wolframalpha.com/input/?i=22+Scorpii|work=Wolfram Alpha}}
- {{cite web|title=22 Scorpii (HIP 80815)|url=http://www.astrostudio.org/xhip.php?hip=80815|archive-url=https://archive.is/20130414095319/http://www.astrostudio.org/xhip.php?hip=80815|dead-url=yes|archive-date=2013-04-14|work=Ashland Astronomy Studio|accessdate=2012-08-19}}
{{Stars of Scorpius}} 8 : B-type main-sequence stars|Scorpius (constellation)|Bayer objects|Durchmusterung objects|Flamsteed objects|Henry Draper Catalogue objects|Hipparcos objects|HR objects |