Eta Circini

η Circini
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Circinus
Right ascension 15h 04m 48.18600s[1]
Declination −64° 01′ 52.8611″[1]
Apparent magnitude (V) 5.17[2]
Characteristics
Spectral type G8 III[3]
B−V color index +0.93[2]
Astrometry
Radial velocity (Rv)44.8±0.8[4] km/s
Proper motion (μ) RA: +102.65[1] mas/yr
Dec.: +9.35[1] mas/yr
Parallax (π)11.82 ± 0.30 mas[1]
Distance276 ± 7 ly
(85 ± 2 pc)
Absolute magnitude (MV)+0.52[5]
Details
Luminosity64[6] L☉
Surface gravity (log g)2.69±0.05[7] cgs
Temperature4,954±22[7] K
Metallicity [Fe/H]−0.37±0.02[7] dex
Other designations
η Cir, CPD−63° 3493, HD 132905, HIP 73776, HR 5593, SAO 253005.[8]
Database references
SIMBADdata

Eta Circini, Latinized from η Circini, is the Bayer designation for a solitary[9] star located in the southern constellation of Circinus. It is faintly visible to the naked eye with an apparent visual magnitude of 5.17.[2] The distance to this star, as determined from an annual parallax shift of 11.82 mas,[1] is around 276 light years.

This is an evolved G-type giant star with a stellar classification of G8 III.[3] It is radiating an estimated 64[6] times the solar luminosity from its outer atmosphere at an effective temperature of 4,954 K.[7]

  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 Cite error: The named reference Corben1968 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference houk1979 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Mcdonald2012 was invoked but never defined (see the help page).
  7. ^ a b c d Cite error: The named reference Alves2015 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).