Nu Chamaeleontis
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Chamaeleon |
| Right ascension | 09h 46m 20.63010s |
| Declination | −76° 46′ 34.0259″ |
| Apparent magnitude (V) | 5.43 |
| Characteristics | |
| Spectral type | G8III |
| U−B color index | +0.57 |
| B−V color index | +0.89 |
| Astrometry | |
| Radial velocity (Rv) | 11.18±0.14 km/s |
| Proper motion (μ) | RA: +83.013 mas/yr Dec.: −56.328 mas/yr |
| Parallax (π) | 17.1643±0.048 mas |
| Distance | 190.0 ± 0.5 ly (58.3 ± 0.2 pc) |
| Absolute magnitude (MV) | 1.59 |
| Details | |
| Mass | 1.64±0.20 M☉ |
| Radius | 6.72±0.02 R☉ |
| Luminosity | 23.63±0.12 L☉ |
| Surface gravity (log g) | +3.07±0.15 cgs |
| Temperature | 4,985+5 −4 K |
| Rotational velocity (v sin i) | 1.2±1.0 km/s |
| Other designations | |
| CPD−76°598, FK5 2784, HD 85396, HIP 47956, HR 3902, SAO 256658 | |
| Database references | |
| SIMBAD | data |
Nu Chamaeleontis is a single star in the southern circumpolar constellation of Chamaeleon. Its name is a Bayer designation that is Latinized from ν Chamaeleontis, and abbreviated Nu Cha or ν Cha. This is a yellow-hued star, dimly visible to the naked eye, with an apparent visual magnitude of 5.43. It is located at a distance of 190 light-years (58 pc) from the Sun, based on its parallax, and is drifting further away with a radial velocity of +11 km/s. It has an absolute magnitude of 1.59.
This an aging G-type giant star with a stellar classification of G8III. Having exhausted the supply of hydrogen at its core, it has expanded and cooled off the main sequence; at present it has 6.7 times the girth of the Sun. The star has 1.6 times the mass of the Sun and is radiating 24 times the Sun's luminosity from its swollen photosphere at an effective temperature of 4,985 K. These coordinates are a source for X-ray emission, which is most likely (99.3% chance) coming from the star.
References
- 1 2 3 4 5 6 7 8 9 10 11 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.
- 1 2 3 4 5 6 7 Allende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: masses, radii and effective temperatures". Astronomy and Astrophysics. 352: 555–562. arXiv:astro-ph/9911002. Bibcode:1999A&A...352..555A.
- 1 2 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.
- 1 2 Johnson, H. L. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99. Bibcode:1966CoLPL...4...99J.
- 1 2 3 de Medeiros, J. R.; et al. (2014). "A catalog of rotational and radial velocities for evolved stars. V. Southern stars". Astronomy & Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. S2CID 54046583.
- ↑ "nu. Cha". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-09-27.
- ↑ 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.
- ↑ Haakonsen, Christian Bernt; Rutledge, Robert E. (September 2009). "XID II: Statistical Cross-Association of ROSAT Bright Source Catalog X-ray Sources with 2MASS Point Source Catalog Near-Infrared Sources". The Astrophysical Journal Supplement. 184 (1): 138–151. arXiv:0910.3229. Bibcode:2009ApJS..184..138H. doi:10.1088/0067-0049/184/1/138. S2CID 119267456.
