Lambda Caeli

Lambda Caeli, Latinized from λ Caeli, is a star in the constellation Caelum. It is also known by its designations HD 30202 and HR 1518.[8] This star is a challenge to view with the naked eye, having an apparent visual magnitude of 6.24.[2] Based on parallax measurements, Lambda Caeli is known to be around 700 light-years distant from the Sun, but is drifting closer with a radial velocity of −4 km/s.[5]

Lambda Caeli
Observation data
Epoch J2000      Equinox J2000
Constellation Caelum
Right ascension  04h 43m 44.27211s[1]
Declination −41° 03′ 53.2340″[1]
Apparent magnitude (V) 6.24[2]
Characteristics
Spectral type K3/4III[3]
U−B color index +1.78[4]
B−V color index +1.468±0.008[2]
Astrometry
Radial velocity (Rv)−4.3±0.4[5] km/s
Proper motion (μ) RA: +10.82[6] mas/yr
Dec.: +10.93[6] mas/yr
Parallax (π)4.6342 ± 0.0664[1] mas
Distance700 ± 10 ly
(216 ± 3 pc)
Absolute magnitude (MV)−0.52[2]
Details
Radius31.43+2.36
−3.87[1] R☉
Luminosity274±5[1] L☉
Temperature4,189+284
−149[1] K
Other designations
λ Cae[7], CD−41°1549, HD 30202, HIP 21998, HR 1518, SAO 216961[8]
Database references
SIMBADdata

This object is an aging K-type giant star with a stellar classification of K3/4III.[3] Having exhausted the supply of hydrogen at its core, it has cooled and expanded; now having 31 times the radius of the Sun. It is radiating 274 times the Sun's luminosity from its swollen photosphere at an effective temperature of 4,189 K.[1]

References
  1. 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.
  2. 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.
  3. Houk, N. (1987). "Michigan catalogue of two dimensional spectral types for the HD stars". Michigan Spectral Survey. 2. Bibcode:1978mcts.book.....H.
  4. Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
  5. Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
  6. van Leeuwen, F. (November 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.
  7. Kostjuk, N. D. (2004). "VizieR Online Data Catalog: HD-DM-GC-HR-HIP-Bayer-Flamsteed Cross Index (Kostjuk, 2002)". VizieR On-line Data Catalog: IV/27A. Originally Published in: Institute of Astronomy of Russian Academy of Sciences (2002). 4027. Bibcode:2004yCat.4027....0K.
  8. "HD 30202". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-09-14.
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