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Star in the constellation Scorpius
Iota1 Scorpii ,
Latinized from ι1 Scorpii, is a
star in the southern
constellation of
Scorpius . With an
apparent visual magnitude of 3.03,
[2] this star can be seen with the naked eye. It is sometimes called by the proper name
Apollyon .
[9]
Parallax measurements place it at a distance of roughly 1,930
light-years (590
parsecs ) from
Earth , with a 9%
margin of error .
[1]
This star has a
stellar classification of F2 Ia,
[3] with the 'Ia'
luminosity class indicating this is a
supergiant more luminous than typical supergiants. It has about 12 times the
Sun's mass
[10] and is radiating about 18,000 times the
Sun's luminosity .
[7] The radius of the star is 122 that of the Sun.
[7]
[a] The
effective temperature of the outer envelope is 6,074 K,
[7] which gives it a yellow-white hue typical of an F-type star.
[11]
Iota1 Scorpii has a 10th magnitude companion at an
angular separation of 37.5
arcseconds , which, at the distance of this star, gives it a
projected separation of 20,000
Astronomical Units (AU). As the relative separation of the two stars along the line of sight to the Earth is not known, however, this distance represents only a minimum value for their separation.
[12]
Notes
^
a
b Radius calculated with temperature and luminosity
References
^
a
b
c
d
e
f van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics , 474 (2): 653–664,
arXiv :
0708.1752 ,
Bibcode :
2007A&A...474..653V ,
doi :
10.1051/0004-6361:20078357 ,
S2CID
18759600
^
a
b
c
d Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory , 4 (99): 99,
Bibcode :
1966CoLPL...4...99J
^
a
b Houk, Nancy (1978), "Michigan catalogue of two-dimensional spectral types for the HD stars", Ann Arbor: Dept. Of Astronomy , 2 , Ann Arbor: Dept. of Astronomy, University of Michigan,
Bibcode :
1978mcts.book.....H
^ De Bruijne, J. H. J.; Eilers, A.-C. (2012). "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project". Astronomy & Astrophysics . 546 : A61.
arXiv :
1208.3048 .
Bibcode :
2012A&A...546A..61D .
doi :
10.1051/0004-6361/201219219 .
S2CID
59451347 .
^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters , 38 (5): 331,
arXiv :
1108.4971 ,
Bibcode :
2012AstL...38..331A ,
doi :
10.1134/S1063773712050015 ,
S2CID
119257644 .
^
a
b Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun",
Monthly Notices of the Royal Astronomical Society , 410 (1): 190–200,
arXiv :
1007.4883 ,
Bibcode :
2011MNRAS.410..190T ,
doi :
10.1111/j.1365-2966.2010.17434.x ,
S2CID
118629873
^
a
b
c
d
e
f McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (2012-11-01).
"Fundamental parameters and infrared excesses of Hipparcos stars" . Monthly Notices of the Royal Astronomical Society . 427 : 343–357.
arXiv :
1208.2037 .
doi :
10.1111/j.1365-2966.2012.21873.x .
ISSN
0035-8711 . Data is available
here at VizieR.
^
a
b Luck, R. Earle (2014).
"Parameters and Abundances in Luminous Stars" . The Astronomical Journal . 147 (6): 137.
Bibcode :
2014AJ....147..137L .
doi :
10.1088/0004-6256/147/6/137 .
^ Moore, Patrick (2010),
The Sky at Night , Patrick Moore's Practical Astronomy, Springer, p. 97,
ISBN
978-1-4419-6408-3
^ Hohle, M. M.; Neuhäuser, R.; Schutz, B. F. (April 2010), "Masses and luminosities of O- and B-type stars and red supergiants", Astronomische Nachrichten , 331 (4): 349,
arXiv :
1003.2335 ,
Bibcode :
2010AN....331..349H ,
doi :
10.1002/asna.200911355 ,
S2CID
111387483
^
"The Colour of Stars" , Australia Telescope, Outreach and Education ,
Commonwealth Scientific and Industrial Research Organisation , December 21, 2004, archived from
the original on March 18, 2012, retrieved 2012-01-16
^ Kaler, James B.,
"Iota-1 Scorpii" , Stars , University of Illinois, retrieved 2012-01-12