Alpha Chamaeleontis

α Chamaeleontis
Location of α Chamaeleontis (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Chamaeleon
Right ascension 08h 18m 31.55319s[1]
Declination −76° 55′ 10.9964″[1]
Apparent magnitude (V) 4.06[2]
Characteristics
Spectral type F5 V Fe-0.8[3]
U−B color index −0.04[2]
B−V color index +0.40[2]
Astrometry
Radial velocity (Rv)−13.4±0.5[4] km/s
Proper motion (μ) RA: 111.12[1] mas/yr
Dec.: 107.49[1] mas/yr
Parallax (π)51.12 ± 0.12 mas[1]
Distance63.8 ± 0.1 ly
(19.56 ± 0.05 pc)
Absolute magnitude (MV)+2.59[5]
Details
Mass1.42[6] M☉
Radius2.11+0.14
−0.05[7] R☉
Luminosity7.542±0.062[7] L☉
Surface gravity (log g)4.28±0.14[6] cgs
Temperature6,580+91
−209[7] K
Metallicity [Fe/H]−0.26[3] dex
Rotational velocity (v sin i)0[8] km/s
Age1.8[6] Gyr
Other designations
α Cha, Alf Cha, CPD−76° 507, GJ 305, HD 71243, HIP 40702, HR 3318, SAO 256496[9]
Database references
SIMBADdata

Alpha Chamaeleontis, Latinized from α Chamaeleontis, is a solitary[10] star in the southern circumpolar constellation of Chamaeleon. It has an apparent visual magnitude of 4.06[2] and thus is bright enough to be seen with the naked eye. With an annual parallax shift of 51.12 mas,[1] it is located 63.8 light years from the Sun. The star is drifting closer with a radial velocity of −13 km/s,[4] and is predicted to come to within 47 light-years in 666,000 years.[5]

This is an F-type main sequence star with a stellar classification of F5 V Fe−0.8,[3] where the 'Fe−0.8' notation indicates an anomalously low abundance of iron. It has an estimated 1.4 times the mass of the Sun,[6] 2.1 times the Sun's radius,[7] and radiates 7.5 times the solar luminosity from its outer atmosphere at an effective temperature of 6,580 K.[7] The star is around 1.8[6] billion years old with a projected rotational velocity that is too low to be measured.[8] The star has been examined for an infrared excess that would suggest the presence of an orbiting debris disk, but none was found.[11]

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Mermilliod1986 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference Gray2006 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  6. ^ a b c d e Cite error: The named reference David2015 was invoked but never defined (see the help page).
  7. ^ a b c d e Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference uesugi_fukuda70 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Andras2013 was invoked but never defined (see the help page).