| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Chamaeleon |
| Right ascension | 09 46 20.63010 |
| 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: +83.279 mas/yr Dec.: −56.443 mas/yr |
| Parallax (π) | 17.2608 ± 0.0763 mas |
| Distance | 189.0 ± 0.8 ly (57.9 ± 0.3 pc) |
| Absolute magnitude (MV) | 1.59 |
| Details | |
| Mass | 1.64±0.20 M☉ |
| Radius | 6.50+0.08 −0.10 R☉ |
| Luminosity | 23.9±0.1 L☉ |
| Surface gravity (log g) | +3.07±0.15 cgs |
| Temperature | 5008+39 −30 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 |
ν Chamaeleontis, Latinized as Nu Chamaeleontis, is a single star in the southern circumpolar constellation of Chamaeleon. It is a yellow-hued star, dimly visible to the naked eye, with an apparent visual magnitude of 5.43. This object is located at a distance of 189 light-years 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 object is 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 6.5 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 5008 K. These coordinates are a source for X-ray emission, which is most likely (99.3% chance) coming from the star.
References
- ^ 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.
- ^ 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.
- ^ 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.
- ^ Johnson, H. L. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99. Bibcode:1966CoLPL...4...99J.
- ^ de Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (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.
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