Eta Reticuli

Eta Reticuli
Location of η Reticuli (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Reticulum
Right ascension 04h 21m 53.32714s[1]
Declination −63° 23′ 11.0072″[1]
Apparent magnitude (V) 5.22[2]
Characteristics
Spectral type G7 III[3]
U−B color index +0.62[2]
B−V color index +0.945[2]
Astrometry
Radial velocity (Rv)+45.0±0.8[4] km/s
Proper motion (μ) RA: +85.56[1] mas/yr
Dec.: +174.62[1] mas/yr
Parallax (π)8.48 ± 0.18 mas[1]
Distance385 ± 8 ly
(118 ± 3 pc)
Absolute magnitude (MV)+1.28[5]
Details[6]
Mass2.54 M☉
Radius12[7] R☉
Luminosity120 L☉
Surface gravity (log g)2.49 cgs
Temperature4,951±48 K
Metallicity [Fe/H]−0.15±0.03[8] dex
Age1.17 Gyr
Other designations
Eta Ret, η Ret, CPD−63 324, FK5 163, HD 28093, HIP 20384, HR 1395, SAO 249009[9]
Database references
SIMBADdata

Eta Reticuli, Latinized from η Reticuli, is a solitary[10] star in the southern constellation of Reticulum. With an apparent visual magnitude of 5.22,[2] it is faintly visible to the naked eye on a dark night. Based upon an annual parallax shift of 8.48 mas,[1] it is located at a distance of roughly 385 light years from the Sun. It may be a member of the high-velocity Zeta Herculis Moving Group of stars that share a common motion through space.[5]

This is an evolved G-type giant star with a stellar classification of G7 III.[3] Based upon stellar models, it has an estimated 2.54[6] times the mass of the Sun and 13.24[7] times the Sun's radius. With an age of around 1.17 billion years, it is radiating 120 times the solar luminosity from its outer atmosphere at an effective temperature of 4,948 K.[6]

Eta Reticuli is moving through the Galaxy at a speed of 117.6 km/s relative to the Sun. Its projected Galactic orbit carries it between 11,700 and 31,600 light years from the center of the Galaxy.[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 Cite error: The named reference houk1979 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Eggen1958 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference Luck2015 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference cadars was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Alves2015 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. ^ "Eta Reticuli (HIP 20384)". Archived from the original on 2014-05-04. Retrieved 2012-08-17.