Nu Chamaeleontis

ν Chamaeleontis, Latinized as Nu Chamaeleontis, is a single[7] 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.[2] This object is located at a distance of 189 light-years from the Sun, based on its parallax,[1] and is drifting further away with a radial velocity of +11 km/s.[5] It has an absolute magnitude of 1.59.[2]

Nu Chamaeleontis
Observation data
Epoch J2000      Equinox J2000
Constellation Chamaeleon
Right ascension  09h 46m 20.63010s[1]
Declination −76° 46′ 34.0259″[1]
Apparent magnitude (V) 5.43[2]
Characteristics
Spectral type G8III[3]
U−B color index +0.57[4]
B−V color index +0.89[4]
Astrometry
Radial velocity (Rv)11.18±0.14[5] km/s
Proper motion (μ) RA: +83.279[1] mas/yr
Dec.: −56.443[1] mas/yr
Parallax (π)17.2608 ± 0.0763[1] mas
Distance189.0 ± 0.8 ly
(57.9 ± 0.3 pc)
Absolute magnitude (MV)1.59[2]
Details
Mass1.64±0.20[2] M☉
Radius6.50+0.08
−0.10[1] R☉
Luminosity23.9±0.1[1] L☉
Surface gravity (log g)+3.07±0.15[2] cgs
Temperature5008+39
−30[1] K
Rotational velocity (v sin i)1.2±1.0[5] km/s
Other designations
CPD−76°598, FK5 2784, HD 85396, HIP 47956, HR 3902, SAO 256658[6]
Database references
SIMBADdata

This object is an aging G-type giant star with a stellar classification of G8III.[3] Having exhausted the supply of hydrogen at its core, it has expanded and cooled off the main sequence; at present it has 6.5[1] times the girth of the Sun. The star has 1.6[2] times the mass of the Sun and is radiating 24[1] times the Sun's luminosity from its swollen photosphere at an effective temperature of 5008 K.[1] These coordinates are a source for X-ray emission, which is most likely (99.3% chance) coming from the star.[8]

References
  1. 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. 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.
  3. Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars. 1. Bibcode:1975mcts.book.....H.
  4. Johnson, H. L. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99. Bibcode:1966CoLPL...4...99J.
  5. 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.
  6. "nu. Cha". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-09-27.
  7. 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.
  8. 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.
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