Lambda Chamaeleontis
  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Musca[1] |
| Right ascension | 12h 07m 49.87572s[2] |
| Declination | −75° 22′ 01.2650″[2] |
| Apparent magnitude (V) | 5.165[3] |
| Characteristics | |
| Evolutionary stage | red giant branch[2] |
| Spectral type | K2II/III[4] |
| U−B color index | +1.37[5] |
| B−V color index | +1.30[5] |
| Astrometry | |
| Radial velocity (Rv) | −45.30±0.8[6] km/s |
| Proper motion (μ) | RA: −92.609[2] mas/yr Dec.: +19.332[2] mas/yr |
| Parallax (π) | 6.6166±0.0819 mas[2] |
| Distance | 493 ± 6 ly (151 ± 2 pc) |
| Absolute magnitude (MV) | −0.40[1] |
| Details | |
| Mass | 1.6[7] M☉ |
| Radius | 28[8] R☉ |
| Luminosity | 295[8] L☉ |
| Surface gravity (log g) | 1.92[7] cgs |
| Temperature | 4,544[8] K |
| Metallicity [Fe/H] | −0.26[7] dex |
| Other designations | |
| λ Cha, CPD−74°880, FK5 2971, HD 105340, HIP 59151, HR 4617, SAO 256905[9] | |
| Database references | |
| SIMBAD | data |
Lambda Chamaeleontis, Latinized from λ Chamaeleontis, is a star located in the constellation Musca. Lambda Chamaeleontis is also known as HR 4617, and HD 105340. This star is visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of 5.165. It is located 493 light-years (151 parsecs) from the Sun, based on its parallax, but is drifting closer with a radial velocity of −45 km/s.
This is an aging K-type giant/bright giant with a stellar classification of K2II/III.[4] With the supply of hydrogen at its core exhausted, the star expanded and cooled. It now has 28 times the radius of the Sun[7] and is radiating 295 times the Sun's luminosity[7] from its enlarged photosphere at an effective temperature of 4,544 K.[8]
The star was first designated Lambda Chamaeleontis by French astronomer Lacaille, in his Coelum Australe Stelliferum. He listed it close to Pi Chamaeleontis in both brightness and location. The IAU redefinition of the constellation borders in 1930, has placed Lambda Chamaeleontis slightly over the border in Musca, rather than Chamaeleon.[10]
References
[edit]- ^ 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.
- ^ a b c d e f 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.
- ^ Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27 – L30. Bibcode:2000A&A...355L..27H.
- ^ a b Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Vol. 1. Bibcode:1975mcts.book.....H.
- ^ a b Johnson, H. L. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99. Bibcode:1966CoLPL...4...99J.
- ^ 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 c d e Khalatyan, A.; Anders, F.; Chiappini, C.; Queiroz, A. B. A.; Nepal, S.; Dal Ponte, M.; Jordi, C.; Guiglion, G.; Valentini, M.; Torralba Elipe, G.; Steinmetz, M.; Pantaleoni-González, M.; Malhotra, S.; Jiménez-Arranz, Ó.; Enke, H.; Casamiquela, L.; Ardèvol, J. (2024). "Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost". Astronomy and Astrophysics. 691: A98. arXiv:2407.06963. Bibcode:2024A&A...691A..98K. doi:10.1051/0004-6361/202451427.
- ^ a b c d Fetherolf, Tara; Pepper, Joshua; Simpson, Emilie; Kane, Stephen R.; Močnik, Teo; English, John Edward; Antoci, Victoria; Huber, Daniel; Jenkins, Jon M.; Stassun, Keivan; Twicken, Joseph D.; Vanderspek, Roland; Winn, Joshua N. (2023). "Variability Catalog of Stars Observed during the TESS Prime Mission". The Astrophysical Journal Supplement Series. 268 (1): 4. arXiv:2208.11721. Bibcode:2023ApJS..268....4F. doi:10.3847/1538-4365/acdee5.
- ^ "HD 105340". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-08-27.
- ^ "Musca Constellation". Constellation Guide; Constellations: A Guide to the Night Sky. Retrieved 25 January 2018.
Further reading
[edit]- Coelum australe stelliferum, p. 20, at Google Books
