Lambda Capricorni

Lambda Capricorni
Location of λ Capricorni (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Capricornus[1]
Right ascension 21h 46m 32.097s[2]
Declination −11° 21′ 57.44″[2]
Apparent magnitude (V) +5.56[3]
Characteristics
Evolutionary stage main sequence
Spectral type A1 V[4]
B−V color index −0.01[3]
Astrometry
Radial velocity (Rv)−2.32±0.51[2] km/s
Proper motion (μ) RA: +29.007 mas/yr[2]
Dec.: −9.420 mas/yr[2]
Parallax (π)12.0253±0.0711 mas[2]
Distance271 ± 2 ly
(83.2 ± 0.5 pc)
Absolute magnitude (MV)+0.89[1]
Details
Mass2.50±0.04[2] M☉
Radius2.21±0.05[2] R☉
Luminosity48.89+0.8
−0.7[2] L☉
Surface gravity (log g)3.99+0.02
−0.01[2] cgs
Temperature10,247+51
−42[2] K
Rotational velocity (v sin i)192.5±5.7[5] km/s
Age271±64[2] Myr
Other designations
λ Cap, 48 Cap, BD−12°6087, FK5 818, HD 207052, HIP 107517, HR 8319, SAO 164639[6]
Database references
SIMBADdata

Lambda Capricorni is a solitary[7] star in the southern constellation of Capricornus. Its name is a Bayer designation that is Latinized from λ Capricorni, and abbreviated Lambda Cap or λ Cap. This star is faintly visible to the naked eye with an apparent visual magnitude of +5.56.[3] Based upon an annual parallax shift of 11.58 mas as seen from the Earth,[2] the star is located 271 light-years (83 pc) from the Sun. At that distance, the visual magnitude is diminished by an extinction factor of 0.11 due to interstellar dust.[8] It is drifting closer with a line of sight velocity of −2 km/s.[2] This star is subject to lunar occultations because of its position near the ecliptic.[9]

This is a white-hued A-type main sequence star with a stellar classification of A1 V.[4] It has been listed as a magnetic Ap star, indicating the spectrum displays chemically peculiar features.[5] However, its status as a true Ap star is disputed.[10] The star has an estimated 2.50 times the mass of the Sun and about 2.21 times the Sun's radius.[2] It is 271[2] million years old and is spinning rapidly with a projected rotational velocity of 192.5 km/s.[5] Lambda Capricorni is radiating 49 times the Sun's luminosity from its photosphere at an effective temperature of 10,247 K.[2]

This star is a member of the HSC 396 cluster of stars, which was discovered in 2023.[10]

References

  1. ^ a b 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. XHIP record for this object at VizieR.
  2. ^ a b c d e f g h i j k l m n o p Vallenari, A.; et al. (Gaia collaboration) (2023), "Gaia Data Release 3. Summary of the content and survey properties", Astronomy and Astrophysics, 674: A1, arXiv:2208.00211, Bibcode:2023A&A...674A...1G, doi:10.1051/0004-6361/202243940, S2CID 244398875. Gaia DR3 record for this source at VizieR.
  3. ^ a b c Corben, P. M.; Stoy, R. H. (1968), "Photoelectric Magnitudes and Colours for Bright Southern Stars", Monthly Notes of the Astronomical Society of Southern Africa, 27: 11, Bibcode:1968MNSSA..27...11C.
  4. ^ a b Royer, F.; et al. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics, 463 (2): 671–682, arXiv:astro-ph/0610785, Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224, S2CID 18475298.
  5. ^ a b c Wraight, K. T.; et al. (February 2012), "A photometric study of chemically peculiar stars with the STEREO satellites - I. Magnetic chemically peculiar stars", Monthly Notices of the Royal Astronomical Society, 420 (1): 757–772, arXiv:1110.6283, Bibcode:2012MNRAS.420..757W, doi:10.1111/j.1365-2966.2011.20090.x, S2CID 14811051.
  6. ^ "lam Cap", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2017-05-13.
  7. ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
  8. ^ Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars", Astronomy Letters, 38 (11): 694–706, arXiv:1606.09028, Bibcode:2012AstL...38..694G, doi:10.1134/S1063773712110035, S2CID 119108982.
  9. ^ Edwards, D. A.; et al. (April 1980), "Photoelectric observations of lunar occultations. XI", Astronomical Journal, 85: 478–489, Bibcode:1980AJ.....85..478E, doi:10.1086/112700.
  10. ^ a b Faltová, N.; et al. (January 2025), "Chemically peculiar stars as members of open clusters", Monthly Notices of the Royal Astronomical Society, 536 (1): 72–78, Bibcode:2025MNRAS.536...72F, doi:10.1093/mnras/stae2563.
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