Eta Chamaeleontis

Eta Chamaeleontis
Location of η Chamaeleontis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Chamaeleon
Right ascension 08h 41m 19.51442s[1]
Declination −78° 57′ 48.1023″[1]
Apparent magnitude (V) 5.453[2]
Characteristics
Spectral type B8V[3]
U−B color index –0.34[4]
B−V color index –0.10[4]
Astrometry
Radial velocity (Rv)14.00[5] km/s
Proper motion (μ) RA: −29.776[1] mas/yr
Dec.: 26.600[1] mas/yr
Parallax (π)10.0442 ± 0.0912 mas[1]
Distance325 ± 3 ly
(99.6 ± 0.9 pc)
Absolute magnitude (MV)+0.57[6]
Details
Mass3.20+0.06
−0.07[7] M☉
Radius3.3[8] R☉
Luminosity99.81±52.10[7] L☉
Temperature12,487±98[9] K
Rotational velocity (v sin i)390[9] km/s
Age8–14[7] Myr
Other designations
η Cha, CPD–78° 372, GC 12063, HD 75416, HIP 42637, HR 3502, SAO 256543[3]
Database references
SIMBADdata

Eta Chamaeleontis, Latinized from η Chamaeleontis, is a star in the constellation Chamaeleon. It has an apparent magnitude of about 5.5, meaning that it is just barely visible to the naked eye. Based upon parallax measurements, this star is located some 325 light-years (100 parsecs) light years (95 parsecs) away from the Sun.[1]

Eta Chamaeleontis has a spectral type of B8V, meaning it is a B-type main sequence star.[3] Stars of this type are typically a few times more massive than the Sun and have effective temperatures of about 10,000 to 30,000 K. Eta Chamaeleontis is just over 3 times more massive than the Sun[7] and has a temperature of about 12,000 K.[9]

  1. ^ a b c d e f 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. ^ 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.
  3. ^ a b c "eta Del". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 15 January 2016.
  4. ^ a b Cousins, A. W. J.; Stoy, R. H. (1962). "Photoelectric magnitudes and colours of Southern stars". Royal Observatory Bulletin. 64: 103. Bibcode:1962RGOB...64..103C. (Accessed using SIMBAD)
  5. ^ Kharchenko, N. V.; et al. (2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ~55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten. 328 (9): 889. arXiv:0705.0878. Bibcode:2007AN....328..889K. doi:10.1002/asna.200710776. S2CID 119323941.
  6. ^ 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, S2CID 119257644.
  7. ^ a b c d Esposito, Thomas M.; et al. (July 2020). "Debris Disk Results from the Gemini Planet Imager Exoplanet Survey's Polarimetric Imaging Campaign". The Astronomical Journal. 160 (1): 44. arXiv:2004.13722. Bibcode:2020AJ....160...24E. doi:10.3847/1538-3881/ab9199. S2CID 216641889. 24.
  8. ^ Pasinetti Fracassini, L. E.; et al. (2001). "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics". Astronomy & Astrophysics. 367 (2): 521–24. arXiv:astro-ph/0012289. Bibcode:2001A&A...367..521P. doi:10.1051/0004-6361:20000451. S2CID 425754.
  9. ^ a b c Paunzen, E.; Schnell, A.; Maitzen, H. M. (2005). "An empirical temperature calibration for the Δ a photometric system . I. The B-type stars". Astronomy and Astrophysics. 444 (3): 941–946. arXiv:astro-ph/0509049. Bibcode:2005A&A...444..941P. doi:10.1051/0004-6361:20053546. S2CID 119436374.