Eta Eridani

η Eridani
Location of η Eridani (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Eridanus
Right ascension 02h 56m 25.64948s[1]
Declination −08° 53′ 53.3221″[1]
Apparent magnitude (V) +3.87[2]
Characteristics
Spectral type K1+ IIIb[3]
U−B color index _0.98[2]
B−V color index +1.12[2]
Variable type suspected[4]
Astrometry
Radial velocity (Rv)−20.32 km/s
Proper motion (μ) RA: +77.36 ± 0.19[1] mas/yr
Dec.: −220.16 ± 0.20[1] mas/yr
Parallax (π)23.89 ± 0.19 mas[1]
Distance137 ± 1 ly
(41.9 ± 0.3 pc)
Absolute magnitude (MV)+0.83[5]
Details
Mass1.43[6] M☉
Radius10.48[6] R☉
Luminosity57.5[6] L☉
Surface gravity (log g)+2.79[6] cgs
Temperature4,742[6] K
Rotational velocity (v sin i)2.34[6] km/s
Age2.66[6] Gyr
Other designations
Azha,[7] η Eri, 3 Eridani, NSV 988, HR 874, HD 18322, BD−09°533, HIP 13701
Database references
SIMBADdata

Eta Eridani (η Eridani, abbreviated Eta Eri, η Eri), officially named Azha (with a silent 'h', possibly /ˈeɪzə/),[8][7] is a giant star in the constellation of Eridanus. Based on parallax measurements taken during the Hipparcos mission, it is approximately 137 light-years from the Sun.

  1. ^ a b c d e Cite error: The named reference hipparcos was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference ducati was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference perkins was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference gcvs was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference dasilva was invoked but never defined (see the help page).
  6. ^ a b c d e f g Cite error: The named reference jofre was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference IAU-LSN was invoked but never defined (see the help page).
  8. ^ Davis, George A. (1944). "The pronunciations, derivations, and meanings of a selected list of star names". Popular Astronomy. 52: 8–30. Bibcode:1944PA.....52....8D.