HD 82741

HD 82741
Location of HD 82741 (circled in red)
Observation data
Epoch J2000      Equinox ICRS
Constellation Lynx
Right ascension 09h 35m 03.83005s
Declination +39° 37′ 17.3743″
Apparent magnitude (V) 4.81
Characteristics
Evolutionary stage red clump
Spectral type G9.5 IIIb Fe-1
B−V color index 0.980
Astrometry
Radial velocity (Rv)0.992±0.002 km/s
Proper motion (μ) RA: −30.124 mas/yr
Dec.: +20.155 mas/yr
Parallax (π)14.6281±0.2230 mas
Distance223 ± 3 ly
(68 ± 1 pc)
Absolute magnitude (MV)0.573
Details
Mass1.62 M☉
Radius8.78±0.61 R☉
Luminosity58.9 L☉
Surface gravity (log g)2.6 cgs
Temperature4,809±51 K
Metallicity [Fe/H]−0.18 dex
Rotational velocity (v sin i)1.0 km/s
Age2.74 Gyr
Other designations
BD+40°2224, FK5 2762, HD 82741, HIP 47029, HR 3809, SAO 61578
Database references
SIMBADdata

HD 82741 is a single star in the northern constellation of Lynx. It is visible to the naked eye with an apparent visual magnitude of 4.81. The distance to HD 82741 is 223 light years, as determined from its annual parallax shift of 14.6 mas. It is moving further from the Earth with a heliocentric radial velocity of 1 km/s.

At the age of 2.74 billion years, this is an evolved giant star with a stellar classification of G9.5 IIIb Fe-1, where the suffix notation indicates an underabundance of iron in its atmosphere. It belongs to a sub-category of giants called the red clump, indicating that it is on the horizontal branch and is generating energy through the fusion of helium at its core. With 1.62 times the mass of the Sun, it has expanded to 9 times the Sun's radius. It is radiating 58.9 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,809 K.

References

  1. 1 2 3 4 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, S2CID 119257644.
  2. 1 2 3 4 5 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.
  3. 1 2 Alves, David R. (August 2000), "K-Band Calibration of the Red Clump Luminosity", The Astrophysical Journal, 539 (2): 732–741, arXiv:astro-ph/0003329, Bibcode:2000ApJ...539..732A, doi:10.1086/309278, S2CID 16673121.
  4. 1 2 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.
  5. 1 2 3 Soubiran, C.; et al. (2008), "Vertical distribution of Galactic disk stars. IV. AMR and AVR from clump giants", Astronomy and Astrophysics, 480 (1): 91–101, arXiv:0712.1370, Bibcode:2008A&A...480...91S, doi:10.1051/0004-6361:20078788, S2CID 16602121.
  6. 1 2 3 4 5 6 7 8 Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal, 150 (3), 88, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, S2CID 118505114.
  7. 1 2 Baines, Ellyn K.; Clark, James H.; Kingsley, Bradley I.; Schmitt, Henrique R.; Stone, Jordan M. (2025-05-07), "Vintage NPOI: New and Updated Angular Diameters for 145 Stars", The Astronomical Journal, 169 (6): 293, arXiv:2506.02912, Bibcode:2025AJ....169..293B, doi:10.3847/1538-3881/adc930, ISSN 1538-3881.
  8. 1 2 Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209, S2CID 121883397.
  9. ↑ "HD 82741". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-08-01.
  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, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.