Lambda Caeli

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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
Distance 700 ± 10  ly
(216 ± 3  pc)
Absolute magnitude  (MV)−0.52 [2]
Details
Radius 31.43+2.36
−3.87
[1]   R
Luminosity 274±5 [1]   L
Temperature 4,189+284
−149
[1]   K
Other designations
λ Cae [7] , CD−41°1549, HD  30202, HIP  21998, HR  1518, SAO  216961 [8]
Database references
SIMBAD data

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]

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]

Related Research Articles

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59 Aurigae, often abbreviated as 59 Aur, is a star in the constellation Auriga. Its baseline apparent magnitude is 6.1, meaning it can just barely be seen with the naked eye as a dim, yellow-white hued star. Based on parallax measurements, it is located about 483 light-years away from the Sun.

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Lambda Coronae Borealis star in the constellation Corona Borealis

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Mu Muscae, Latinized from μ Muscae, is a solitary star in the southern constellation of Musca. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of around 4.75. Based upon an annual parallax shift of 7.21 mas as seen from Earth, it is located about 450 light years from the Sun. The star is drifting further away with a radial velocity of +37 km/s.

47 Capricorni is a variable star located around 1,170 light years from the Sun in the southern constellation Capricornus, near the northern border with Aquarius. It has the variable star designation of AG Capricorni and a Bayer designation of c2 Capricorni; 47 Capricorni is the Flamsteed designation. This object is visible to the naked eye as a dim, red-hued point of light with an apparent visual magnitude that varies between 5.90 and 6.14. The star is receding from the Earth with a heliocentric radial velocity of +20 km/s.

77 Ceti is a single, orange-hued star located 489 light years away in the equatorial constellation of Cetus. It is faintly visible to the naked eye, having an apparent visual magnitude of 5.7. This is an evolved giant star with a stellar classification of K2 III. It is radiating 187 times the Sun's luminosity from its photosphere at an effective temperature of 4,206 K.

References

  1. 1 2 3 4 5 6 7 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. 1 2 3 4 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. 1 2 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. 1 2 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. 1 2 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. 1 2 "HD 30202". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2019-09-14.