31 Lyncis

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31 Lyncis
Observation data
Epoch J2000      Equinox J2000
Constellation Lynx
Right ascension 08h 22m 50.13s[1]
Declination +43° 11′ 18.1″[1]
Apparent magnitude (V) +4.25[2]
Spectral type K4.5 III
Radial velocity (Rv)24.56 ± 0.22 km/s
Proper motion (μ) RA: –25.16 ± 0.36[1] mas/yr
Dec.: –99.23 ± 0.21[1] mas/yr
Parallax (π)8.53 ± 0.25[1] mas
Distance380 ± 10 ly
(117 ± 3 pc)
Surface gravity (log g)1.46 ± 0.12[3] cgs
Temperature3921 ± 19[3] K
Metallicity [Fe/H]-0.06 ± 0.05[3] dex
Other designations
Alsciaukat, BD +43 1815, FK5 314, HR 3275, HD 70272, HIP 41075, SAO 42319, NSV 4030, GC 11401.
Database references

31 Lyncis, also named Alsciaukat,[4] is the fourth-brightest star in the constellation of Lynx. It is an orange giant star located about 390 light-years from the Sun. Its apparent magnitude is +4.25 and it belongs to the spectral class K4.5III-IIIb.

A 1993 study found that it varied in brightness by 0.05 magnitude over 25 to 30 days.[5]

Analysis of HIPPARCOS data showed that it was slightly variable by 0.0055 magnitude.[6]


31 Lyncis is the star's Flamsteed designation.

It bore the traditional names Alsciaukat, from Arabic الشوكة aš-šawkat "the thorn", and Mabsuthat, from Arabic المبسوطة al-mabsūtah "the outstretched (paw)".[7] In 2016, the International Astronomical Union (IAU) organized a Working Group on Star Names (WGSN)[8] to catalog and standardize proper names for stars. The WGSN approved the name Alsciaukat for this star on 30 June 2017 and it is now so included in the List of IAU-approved Star Names.[4]


  1. ^ a b c d e 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. ^ Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
  3. ^ a b c Sharma, Kaushal; Prugniel, Philippe; Singh, Harinder P. (2016). "New atmospheric parameters and spectral interpolator for the MILES cool stars". Astronomy & Astrophysics. 585: 27. arXiv:1512.04882. Bibcode:2016A&A...585A..64S. doi:10.1051/0004-6361/201526111. A64.
  4. ^ a b "Naming Stars". IAU.org. Retrieved 16 December 2017.
  5. ^ Percy, John R. (1993). "The photometric variability of K giants". Publications of the Astronomical Society of the Pacific. 105 (694): 1422–26. Bibcode:1993PASP..105.1422P. doi:10.1086/133324.
  6. ^ Koen, Chris; Eyer, Laurent (2002). "New periodic variables from the Hipparcos epoch photometry". Monthly Notices of the Royal Astronomical Society. 331: 45. arXiv:astro-ph/0112194. Bibcode:2002MNRAS.331...45K. doi:10.1046/j.1365-8711.2002.05150.x.
  7. ^ Allen, Richard Hinckley (1963) [1899]. Star Names: Their Lore and Meaning (Reprint ed.). New York, NY: Dover Publications Inc. p. 280. ISBN 0-486-21079-0.
  8. ^ "IAU Working Group on Star Names (WGSN)". Retrieved 22 May 2016.

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