Iota Virginis

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ι Virginis
Virgo IAU.svg
Cercle rouge 100%.svg

Location of ι Virginis.
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Virgo
Right ascension 14h 16m 00.9s
Declination −6° 00′ 02″
Apparent magnitude (V) +4.07[1]
Absolute magnitude (V) +2.44[2]
Distance 69.8 ± 1.3 ly
(21.4 ± 0.4 pc)
Spectral type F7 III[3]
Other designations
Syrma, 99 Virginis, BD-05 3843, FK5 525, HD 124850, HIP 69701, HR 5338, SAO 139824, Wo 9473.
Database references

Iota Virginis (ι Vir, ι Virginis) is a star in the constellation Virgo. It has the traditional name Syrma.[4]

Syrma is a yellow star of apparent magnitude 4.08 and spectral class F7 III about 70 light years from Earth. This star has 1.52 times the mass of the Sun,[5] with a projected rotational velocity of 14.8 km s−1.[2] It is radiating 8.6 times the luminosity of the Sun from its outer atmosphere at an effective temperature of 6,282 K.[1] The radius is about 2.5 times that of the Sun.[6]

In culture[edit]

  • The name Syrma is from the Arabic (سرما (تطريز sirmā "train" (of a garment).
  • In China, 亢宿 (Kàng Xiù), meaning Neck, refers to an asterism consisting of this star, κ Virginis, κ Virginis and λ Virginis.[7] Consequently, ι Virginis itself is known as 亢宿二 (Kàngsuèr, English: the Second Star of Neck.)


  1. ^ a b Mallik, Sushma V. (December 1999), "Lithium abundance and mass", Astronomy and Astrophysics, 352: 495–507, Bibcode:1999A&A...352..495M 
  2. ^ a b Pizzolato, N.; Maggio, A.; Sciortino, S. (September 2000), "Evolution of X-ray activity of 1-3 Msun late-type stars in early post-main-sequence phases", Astronomy and Astrophysics, 361: 614–628, Bibcode:2000A&A...361..614P 
  3. ^ Gray, R. O.; Napier, M. G.; Winkler, L. I. (2001). "The Physical Basis of Luminosity Classification in the Late A-, F-, and Early G-Type Stars. I. Precise Spectral Types for 372 Stars". The Astronomical Journal. 121 (4): 2148. Bibcode:2001AJ....121.2148G. doi:10.1086/319956. 
  4. ^ Allen, R. H., (1963). Star Names: Their Lore and Meaning (Reprint ed.). New York, NY: Dover Publications Inc. p. 472. ISBN 0-486-21079-0. 
  5. ^ Shaya, Ed J.; Olling, Rob P. (January 2011), "Very Wide Binaries and Other Comoving Stellar Companions: A Bayesian Analysis of the Hipparcos Catalogue", The Astrophysical Journal Supplement, 192 (1): 2, arXiv:1007.0425free to read, Bibcode:2011ApJS..192....2S, doi:10.1088/0067-0049/192/1/2 
  6. ^ 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 
  7. ^ (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 28 日

External links[edit]