Eta Eridani

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Star
η Eridani
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation Eridanus
Right ascension 02 h 56 m 25.65 s
declination -08 ° 53 ′ 53.3 ″
Apparent brightness 3.89 likes
Typing
B − V color index +1.11 
U − B color index +1.00 
R − I index +0.58 
Spectral class K1 III-IV
Astrometry
Radial velocity (−20.3 ± 0.7) km / s
parallax (23.89 ± 0.19)  mas
distance (136.5 ± 1.1)  Lj
(41.86 ± 0.33)  pc  
Visual absolute brightness M vis +0.78 mag
Proper movement 
Rec. Share: (+77.36 ± 0.19)  mas / a
Dec. portion: (−220.16 ± 0.20)  mas / a
Physical Properties
Other names
and catalog entries
Bayer name η Eridani
Flamsteed name 3 Eridani
Bonn survey BD −9 ° 553
Bright Star Catalog HR 874 [1]
Henry Draper Catalog HD 18322 [2]
Hipparcos catalog HIP 13701 [3]
SAO catalog SAO 130197 [4]
Tycho catalog TYC 5287-1076-1 [5]

η Eridani ( Eta Eridani , short η Eri ) is a star of the spectral class K1 III-IV in the constellation Eridanus and has an apparent magnitude of 3.9 mag. It is just under 140 light years from the sun .

A historical proper name is Azha ("the breeding ground"). On September 12, 2016, the IAU defined this historical proper name as the standardized proper name for this star.

Individual evidence

  1. ↑ a b c Hipparcos catalog (ESA 1997)
  2. ↑ a b c Bright Star Catalog
  3. ↑ Pulkovo radial velocities for 35493 HIP stars
  4. ↑ a b c Hipparcos, the New Reduction (van Leeuwen, 2007)
  5. ↑ calculated from apparent brightness and distance
  6. ↑ Bulletin of the IAU Working Group on Star Names, No. October 2, 2016. (PDF) Retrieved November 10, 2016 (English, 151 KiB).