Astronomy:Kappa Serpentis

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Short description: Red giant star in the constellation Serpens
Kappa Serpentis
Observation data
Equinox J2000.0]] (ICRS)
Constellation Serpens
Right ascension  15h 48m 44.37720s[1]
Declination +18° 08′ 29.6337″[1]
Apparent magnitude (V) 4.09[2]
Characteristics
Evolutionary stage red giant branch[3]
Spectral type M0.5III[4]
U−B color index +1.95[2]
B−V color index +1.62[2]
Astrometry
Radial velocity (Rv)−38.48[5] km/s
Proper motion (μ) RA: −52.407[1] mas/yr
Dec.: −88.419[1] mas/yr
Parallax (π)8.5231 ± 0.1657[1] mas
Distance383 ± 7 ly
(117 ± 2 pc)
Absolute magnitude (MV)−1.25[6]
Details
Mass2.7[7] M☉
Radius71.31+1.42
−1.48[8] R☉
Luminosity1,021±57[8] L☉
Surface gravity (log g)1.96[7] cgs
Temperature3,863±39[8] K
Metallicity [Fe/H]−0.30[7] dex
Other designations
Gudja, κ Ser, 35 Ser, NSV 7269, BD+18 3074, FK5 584, HD 141477, HIP 77450, HR 5879, SAO 101752[9]
Database references
SIMBADdata

Kappa Serpentis, Latinised from κ Serpentis, is a single,[10] red-hued star in the constellation Serpens, in its head (Serpens Caput). It has the proper name Gudja /ˈɡuːdʒə/[11] and the Flamsteed designation 35 Serpentis.[9] This star is visible to the naked eye with an apparent visual magnitude of +4.09.[2] It is located approximately 383 light years from the Sun, based on parallax,[1] and is drifting closer with a radial velocity of −38 km/s.[5]

This object is an aging red giant star with a stellar classification of M0.5III.[4] After exhausting the supply of hydrogen at its core, the star cooled and expanded off the main sequence, and now has around 71 times the Sun's radius. It is radiating nearly 1,000 times the luminosity of the Sun from its photosphere at an effective temperature of 3,863 K.[8] This is a suspected variable star.[12] Although simple grading based on its colour and luminosity mark this star as possibly being on the asymptotic giant branch,[13] a closer study places it as being towards the most luminous part of the red giant branch, before starting core helium fusion.[3]

Nomenclature

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

The star bore the traditional name Gudja (or Judja[14]) in the culture of the Wardaman people of the Northern territory of Australia, meaning 'water goanna'.[15] In 2016, the IAU organized a Working Group on Star Names (WGSN)[16] 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.[11]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 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. ↑ 3.0 3.1 Eggen, Olin J.; Iben, ((Icko, Jr.)) (1991). "First Giant Branch and Asymptotic Giant Branch Stars in Nearby Aggregates". The Astronomical Journal 101: 1377. doi:10.1086/115773. Bibcode: 1991AJ....101.1377E. 
  4. ↑ 4.0 4.1 Keenan, Philip C.; McNeil, Raymond C. (October 1989). "The Perkins Catalog of Revised MK Types for the Cooler Stars". Astrophysical Journal Supplement Series 71: 245–266. doi:10.1086/191373. Bibcode: 1989ApJS...71..245K. 
  5. ↑ 5.0 5.1 Famaey, B. et al. (18 February 2009). "Spectroscopic binaries among Hipparcos M giants – I. Data, orbits, and intrinsic variations". Astronomy and Astrophysics 498 (2): 627–640. doi:10.1051/0004-6361/200810698. Bibcode: 2009A&A...498..627F. 
  6. ↑ Anderson, E.; Francis, Ch. (25 May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. 
  7. ↑ 7.0 7.1 7.2 Khalatyan, A.; Anders, F.; Chiappini, C.; Queiroz, A. B. A.; Nepal, S.; Dal Ponte, M.; Jordi, C.; Guiglion, G. et al. (2024). "Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost". Astronomy and Astrophysics 691: A98. doi:10.1051/0004-6361/202451427. Bibcode: 2024A&A...691A..98K. 
  8. ↑ 8.0 8.1 8.2 8.3 Baines, Ellyn K.; Thomas Armstrong, J.; Clark, James H.; Gorney, Jim; Hutter, Donald J.; Jorgensen, Anders M.; Kyte, Casey; Mozurkewich, David et al. (2021). "Angular Diameters and Fundamental Parameters of Forty-four Stars from the Navy Precision Optical Interferometer". The Astronomical Journal 162 (5): 198. doi:10.3847/1538-3881/ac2431. Bibcode: 2021AJ....162..198B. 
  9. ↑ 9.0 9.1 "kap Ser". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=kap+Ser. 
  10. ↑ Eggleton, P. P.; Tokovinin, A. A. (2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society 389 (2): 869–879. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E. 
  11. ↑ 11.0 11.1 "IAU Catalog of Star Names (IAU-CSN)" (TXT). International Astronomical Union. 17 September 2018. http://www.pas.rochester.edu/~emamajek/WGSN/IAU-CSN.txt. 
  12. ↑ Samus, N. N. et al. (28 September 2017). "General Catalogue of Variable Stars". Astronomy Reports. GCVS 5.1 61 (1): 80–88. doi:10.1134/S1063772917010085. Bibcode: 2017ARep...61...80S. 
  13. ↑ Eggen, Olin J. (1992). "Asymptotic Giant Branch Stars Near the Sun". The Astronomical Journal 104: 275. doi:10.1086/116239. Bibcode: 1992AJ....104..275E. 
  14. ↑ IAU Working Group on Star Names. Annual Report WGSN 2023 (Report). https://exopla.net/wp-content/uploads/2025/04/2023_Annual-Report-WGSN_for2023.pdf. 
  15. ↑ "IAU Working Group on Star Names (WGSN)" (Press release). International Astronomical Union. Archived from the original on 2020-10-04.
  16. ↑ "Division C WG Star Names". International Astronomical Union. https://www.iau.org/science/scientific_bodies/working_groups/280/. 

Coordinates: Sky map 15h 48m 44.4s, +18° 08′ 29.6″



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