Eta Eridani
Star η Eridani |
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AladinLite | |||||||||||||||||
Observation dates equinox : J2000.0 , epoch : J2000.0 |
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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 |
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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 |
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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
- ↑ a b c Hipparcos catalog (ESA 1997)
- ↑ a b c Bright Star Catalog
- ↑ Pulkovo radial velocities for 35493 HIP stars
- ↑ a b c Hipparcos, the New Reduction (van Leeuwen, 2007)
- ↑ calculated from apparent brightness and distance
- ↑ Bulletin of the IAU Working Group on Star Names, No. October 2, 2016. (PDF) Retrieved November 10, 2016 (English, 151 KiB).