Kappa Serpentis

Kappa Serpentis, Latinised from κ Serpentis, is a single,[8] red-hued star in the constellation Serpens, in its head (Serpens Caput). It has the proper name Gudja /ˈɡuːdʒə/[9] and the Flamsteed designation 35 Serpentis.[7] This star is visible to the naked eye with an apparent visual magnitude of +4.09.[2] It is located approximately 382 light years from the Sun, based on parallax,[1] and is drifting closer with a radial velocity of −38 km/s.[4]

Kappa Serpentis
Observation data
Epoch J2000      Equinox J2000
Constellation Serpens
Right ascension  15h 48m 44.37676s[1]
Declination 18° 08′ 29.6342″[1]
Apparent magnitude (V) 4.09[2]
Characteristics
Spectral type M0.5III[3]
U−B color index +1.95 [2]
B−V color index +1.62 [2]
Astrometry
Radial velocity (Rv)−38.48[4] km/s
Proper motion (μ) RA: −51.88[1] mas/yr
Dec.: −88.10[1] mas/yr
Parallax (π)8.54 ± 0.23[1] mas
Distance380 ± 10 ly
(117 ± 3 pc)
Absolute magnitude (MV)−1.25[5]
Details
Radius51.3+5.1
−4.9[6] R☉
Luminosity628.0±33.8}[6] L☉
Temperature4,033+206
−185}[6] K
Other designations
Gudja, κ Ser, 35 Ser, NSV 7269, FK5 584, HD 141477, HIP 77450, HR 5879, SAO 101752[7]
Database references
SIMBADdata

This object is an aging red giant star with a stellar classification of M0.5III.[3] After exhausting the supply of hydrogen at its core, the star cooled and expanded off the main sequence, and now has around 51 times the Sun's radius. It is radiating 628 times the luminosity of the Sun from its photosphere at an effective temperature of 4,033 K.[6] This is a suspected variable star.[10]

Nomenclature

κ Serpentis (Latinised to Kappa Serpentis) is the star's Bayer designation.

The star bore the traditional name Gudja in the culture of the Wardaman people of the Northern territory of Australia, meaning water goanna.[11] In 2016, the IAU organized a Working Group on Star Names (WGSN)[12] to catalog and standardize proper names for stars. The WGSN approved the name Gudja for this star on 10 August 2018 and it is now so included in the List of IAU-approved Star Names.[9]

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. Vizier catalog entry
  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. Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series. 71: 245. Bibcode:1989ApJS...71..245K. doi:10.1086/191373.
  4. Famaey, B.; et al. (2009). "Spectroscopic binaries among Hipparcos M giants,. I. Data, orbits, and intrinsic variations". Astronomy and Astrophysics. 498 (2): 627–640. arXiv:0901.0934. Bibcode:2009A&A...498..627F. doi:10.1051/0004-6361/200810698.
  5. 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.
  6. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  7. "kap Ser". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-09-14.
  8. Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
  9. "IAU Catalog of Star Names". International Astronomical Union. Retrieved 2018-09-17.
  10. Samus, N. N.; et al. (2017). "General Catalogue of Variable Stars". Astronomy Reports. 5.1. 61 (1): 80–88. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085.
  11. "IAU Working Group on Star Names (WGSN)" (Press release). IAU.org.
  12. "IAU Working Group on Star Names (WGSN)". International Astronomical Union. Retrieved 17 September 2018.
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