Iota Chamaeleontis

Iota Chamaeleontis
Location of ι Chamaeleontis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Chamaeleon
Right ascension 09h 24m 09.22580s[1]
Declination −80° 47′ 12.7597″[1]
Apparent magnitude (V) 5.34[2]
Characteristics
Spectral type F3/5 III/V[3]
U−B color index +0.01[4]
B−V color index +0.454±0.003[2]
Astrometry
Radial velocity (Rv)−3.57±0.66[1] km/s
Proper motion (μ) RA: -138.690[1] mas/yr
Dec.: +134.928[1] mas/yr
Parallax (π)17.3878 ± 0.0925 mas[1]
Distance187.6 ± 1.0 ly
(57.5 ± 0.3 pc)
Absolute magnitude (MV)+1.52[2]
Details
Radius3.63+0.10
−0.13[1] R☉
Luminosity20.244±0.136[1] L☉
Temperature6,429+63
−90[1] K
Metallicity [Fe/H]−0.04[5] dex
Rotational velocity (v sin i)129.7[6] km/s
Age1.2±0.1[2] Gyr
Other designations
ι Cha, CD−80°329, FK5 2753, GC 13066, HD 82554, HIP 46107, HR 3795, SAO 258530[7]
Database references
SIMBADdata

ι Chamaeleontis, Latinized as Iota Chamaeleontis, is a single[8] star in the southern circumpolar constellation of Chamaeleon. It is visible to the naked eye as a dim, yellow-white hued point of light, having an apparent magnitude of about 5.3.[2] Based upon parallax measurements,[1] this star is around 188 light years away from the Sun, but it is drifting closer with a radial velocity of −4 km/s.[1]

Spectra of the star taken in different years have been given types of F3IV/V and F5III, leading to a mean published type of F3/5 III/V, with the suspicion that the spectrum is variable. It is an F-type star, likely an evolving subgiant.[9] It is 1.2[2] billion years old with 3.6[1] times the Sun's radius. The star has a high rate of spin with a projected rotational velocity of 130 km/s,[6] which is giving it an oblate shape with an equatorial bulge some 9% larger than the polar radius.[10] It is radiating over 20[1] times the Sun's luminosity from its photosphere at an effective temperature of 6,429 K.[1] An infrared excess suggests a circumstellar disk of dust is orbiting at a distance of 8.3 AU from the star with a mean temperature of 200 K.[11]

  1. ^ a b c d e f g h i j k l m n Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference houk1975 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference UBV was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Nordström2004 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Reiners was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Allen was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference vanBelle2012 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Cotten2016 was invoked but never defined (see the help page).