Iota Leonis

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ι 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
78 Leonis, BD+11 2348, HD 99028, HIP 55642, HR 4399, SAO 99587.[2]
Database references

ι Leonis, Latinised as Iota Leonis, is a star in the constellation Leo.

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]


In Chinese, 太微右垣 (Tài Wēi Yòu Yuán), meaning Right Wall of Supreme Palace Enclosure, refers to an asterism consisting of ι Leonis, β Virginis, σ Leonis, θ Leonis and δ Leonis.[10] Consequently, ι Leonis itself is known as 太微右垣三 (Tài Wēi Zuǒ Yuán sān, English: the Third Star of Right Wall of Supreme Palace Enclosure.),[11] representing 西次將 (Xīcìjiāng), meaning The Second Western General.[12] 西次將 (Xīcìjiāng), spelled Tsze Tseang by R.H. Allen, means "the Second General" [13]

See also[edit]


  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:0708.1752v1Freely accessible, 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), "MK Classifications of Spectroscopic Binaries", The Astrophysical Journal Supplement, The Astrophysical Journal Supplement Series, 180 (1): 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. ^ (Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.
  11. ^ (Chinese) 香港太空館 - 研究資源 - 亮星中英對照表 Archived 2010-08-19 at the Wayback Machine., Hong Kong Space Museum. Accessed on line November 23, 2010.
  12. ^ (Chinese) English-Chinese Glossary of Chinese Star Regions, Asterisms and Star Name Archived 2008-09-24 at the Wayback Machine., Hong Kong Space Museum. Accessed on line November 23, 2010.
  13. ^ Richard Hinckley Allen (1963). "LacusCurtius • Allen's Star Names — Leo". Star Names.