Lambda Caeli
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Caelum[1] |
| Right ascension | 04h 43m 44.272s[2] |
| Declination | −41° 03′ 53.23″[2] |
| Apparent magnitude (V) | 6.24[1] |
| Characteristics | |
| Spectral type | K3/4III[3] |
| U−B color index | +1.78[4] |
| B−V color index | +1.468±0.008[1] |
| Astrometry | |
| Radial velocity (Rv) | −4.3±0.4[5] km/s |
| Proper motion (μ) | RA: +10.950 mas/yr[2] Dec.: +11.040 mas/yr[2] |
| Parallax (π) | 4.4581±0.0265 mas[2] |
| Distance | 732 ± 4 ly (224 ± 1 pc) |
| Absolute magnitude (MV) | −0.52[1] |
| Details | |
| Mass | 4.20+0.11 −0.39[2] M☉ |
| Radius | 33.0±0.7[2] R☉ |
| Luminosity | 408.6+5.5 −4.5[2] L☉ |
| Surface gravity (log g) | 4.47+0.10 −0.04[2] cgs |
| Temperature | 4,118+128 −71[2] K |
| Other designations | |
| λ Cae[6], CD−41°1549, GC 5775, HD 30202, HIP 21998, HR 1518, SAO 216961[7] | |
| Database references | |
| SIMBAD | data |
Lambda Caeli is a star in the southern constellation of Caelum. Its name is a Bayer designation that is Latinized from λ Caeli, and abbreviated Lambda Cae or λ Cae;[6] it is also known by its designations HD 30202 and HR 1518.[7] This star is a challenge to view with the naked eye, having an apparent visual magnitude of 6.24.[1] Based on parallax measurements, Lambda Caeli is known to be around 700 light-years (210 pc) distant from the Sun, but it 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 expanded and cooled; now having 31 times the radius of the Sun. With 4.2 times the mass of the Sun, it is radiating 409 times the Sun's luminosity from its swollen photosphere at an effective temperature of 4,118 K.[2]
References
[edit]- ^ a b c d e 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.
- ^ a b c d e f g h i j 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.
- ^ a b Houk, N. (1987). "Michigan catalogue of two dimensional spectral types for the HD stars". Michigan Spectral Survey. 2. Bibcode:1978mcts.book.....H.
- ^ Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
- ^ a b 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. S2CID 119231169.
- ^ a b 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.
- ^ a b "HD 30202". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-09-14.
