Iota Leonis

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Iota Leonis
Diagram showing star positions and boundaries of the Leo constellation and its surroundings
Cercle rouge 100%.svg

Location of ι Leonis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Leo
Right ascension 11h 23m 55.45273s[1]
Declination +10° 31′ 46.2195″[1]
Apparent magnitude (V) 4.00[2]
Spectral type F3 V[3]
U−B color index +1.420[4]
B−V color index +0.456[4]
Variable type Suspected[5]
Radial velocity (Rv) −10.3[6] km/s
Proper motion (μ) RA: +141.45[1] mas/yr
Dec.: −79.14[1] mas/yr
Parallax (π) 41.26 ± 1.16[1] mas
Distance 79 ± 2 ly
(24.2 ± 0.7 pc)
Mass 1.62−1.70[7] M
Radius 2.1[8] R
Luminosity 11.5[7] L
Surface gravity (log g) 3.98[9] cgs
Temperature 6,739[9] K
Metallicity [Fe/H] 0.06[9] dex
Rotational velocity (v sin i) 16[7] km/s
Age 1.7[7] Gyr
Other designations
BD+11 2348, HD 99028, HIP 55642, HR 4399, SAO 99587.[2]

Iota Leonis is a star in the constellation Leo.

It was known as 太微右垣三, "the Third (Star) of the Right Wall of the Supreme Palace Enclosure" or 次將 (Tsze Tseang, Mandarin cìjiàng), "the Vice-General", in traditional Chinese astronomy[10]

Iota Leonis is of stellar classification F3 V and apparent visual magnitude +3.94. It is a spectroscopic binary, which means it is a binary star with components that are too close together to be able to resolve individually through a telescope.[7]


  1. ^ a b c d e van Leeuwen, Floor (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, arXiv:0708.1752v1, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357  Note: see VizieR catalogue I/311.
  2. ^ a b "iot Leo -- Spectroscopic binary". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2010-04-07. 
  3. ^ Abt, Helmut A. (January 2009), The Astrophysical Journal Supplement 180 (1), pp. 117–118, Bibcode:2009ApJS..180..117A, doi:10.1088/0067-0049/180/1/117 
  4. ^ a b Rufener, F. (October 1976). "Second catalogue of stars measured in the Geneva Observatory photometric system". Astronomy & Astrophysics Supplement Series 26: 275–351. Bibcode:1976A&AS...26..275R. 
  5. ^ Kukarkin, B. V.; et al. (1981). Nachrichtenblatt der Vereinigung der Sternfreunde e.V. (Catalogue of suspected variable stars). Moscow, Academy of Sciences USSR Shternberg. Bibcode:1981NVS...C......0K. 
  6. ^ Wilson, R. E. (1953). "General Catalogue of Stellar Radial Velocities". Washington D.C.: Carnegie Institute. Bibcode:1953GCRV..C......0W. Retrieved 2009-10-24. 
  7. ^ a b c d e Bi, S.-L.; Basu, Sarbani; Li, L.-H. (February 2008). "Seismological Analysis of the Stars γ Serpentis and ι Leonis: Stellar Parameters and Evolution". The Astrophysical Journal 673 (2): 1093–1105. Bibcode:2008ApJ...673.1093B. doi:10.1086/521575. 
  8. ^ Malagnini, M. L.; Morossi, C. (November 1990), "Accurate absolute luminosities, effective temperatures, radii, masses and surface gravities for a selected sample of field stars", Astronomy and Astrophysics Supplement Series 85 (3): 1015–1019, Bibcode:1990A&AS...85.1015M 
  9. ^ a b c Balachandran, Suchitra (May 1, 1990). "Lithium depletion and rotation in main-sequence stars". Astrophysical Journal, Part 1 354: 310–332. Bibcode:1990ApJ...354..310B. doi:10.1086/168691. 
  10. ^ Richard Hinckley Allen: Star Names — Their Lore and Meaning: Leo

See also[edit]