Iota Piscis Austrini

Iota Piscis Austrini (ι Piscis Austrini) is a solitary,[6] blue-white hued star in the southern constellation of Piscis Austrinus. It has an apparent visual magnitude of +4.35[2] and is around 500 light years from the Sun. This is an A-type main sequence star with a stellar classification of A0 V.[3] It has a magnitude 11.4 visual companion located at an angular separation of 20 arc seconds along a position angle of 290°, as of 1910.[7]

Iota Piscis Austrini
Location of ι Piscis Austrini (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Piscis Austrinus
Right ascension  22h 14m 18.75180s[1]
Declination −27° 46′ 00.8667″[1]
Apparent magnitude (V) +4.35[2]
Characteristics
Spectral type A0 V[3] or A0 III-IV[4]
U−B color index −0.11[2]
B−V color index −0.05[2]
Astrometry
Proper motion (μ) RA: +23.60[1] mas/yr
Dec.: −6.20[1] mas/yr
Parallax (π)6.51 ± 0.33[1] mas
Distance500 ± 30 ly
(154 ± 8 pc)
Absolute magnitude (MV)+0.37[4]
Details
Luminosity87[4] L☉
Rotational velocity (v sin i)50[3] km/s
Other designations
ι PsA, 9 Piscis Austrini, CPD−33° 6184, FK5 814, HD 206742, HIP 107380, HR 8305, SAO 213258, WDS J21449-3302A[5]
Database references
SIMBADdata

Iota Piscis Austrini is moving through the Galaxy at a speed of 29.7 km/s relative to the Sun. Its projected Galactic orbit carries it between 18,400 and 24,300 light years from the center of the Galaxy.[8]

Naming

In Chinese, 天錢 (Tiān Qián), meaning Celestial Money, refers to an asterism consisting of refers to an asterism consisting of ι Piscis Austrini 13 Piscis Austrini, θ Piscis Austrini, μ Piscis Austrini and τ Piscis Austrini. Consequently, the Chinese name for ι Piscis Austrini itself is 天錢三 (Tiān Qián sān, English: the Third Star of Celestial Money.)[9]

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References
  1. van Leeuwen, F. (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.
  2. Drilling, J. S. (December 1971), "UBV photometry of early-type stars in two regions at high galactic latitudes", Astronomical Journal, 76: 1072, Bibcode:1971AJ.....76.1072D, doi:10.1086/111221.
  3. Levato, O. H. (August 1972), "Rotational Velocities and Spectral Types of Some A-Type Stars", Publications of the Astronomical Society of the Pacific, 84 (500): 584, Bibcode:1972PASP...84..584L, doi:10.1086/129336.
  4. 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.
  5. "iot PsA -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-05-18.
  6. Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
  7. Mason, B. D.; et al. (2014), The Washington Visual Double Star Catalog, Bibcode:2001AJ....122.3466M, doi:10.1086/323920, retrieved 2015-07-22
  8. Iota Piscis Austrini (HIP 107380)
  9. (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 5 日
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