Eta Orionis

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Double star
η Orionis
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation Orion
Right ascension 05 h 24 m 28.62 s
declination -02 ° 23 ′ 49.7 ″
Apparent brightness 3.35 mag
Typing
B − V color index −0.17 
U − B color index −0.92 
R − I index −0.23 
Spectral class B1 V + B2
Variable star type Beta Lyrae Star 
Astrometry
parallax (3.34 ± 1.07)  mas
distance (980 ± 310)  ly
(299 ± 96)  pc  
Visual absolute brightness M vis −4.03 mag
Proper movement 
Rec. Share: (−0.71 ± 1.13)  mas / a
Dec. portion: (−3.46 ± 0.85)  mas / a
Physical Properties
Luminosity

6200  L ☉

Other names
and catalog entries
Bayer name η Orionis
Flamsteed name 28 Orionis
Bonn survey BD −2 ° 1235
Bright Star Catalog HR 1788 [1]
Henry Draper Catalog HD 35411 [2]
Hipparcos catalog HIP 25281 [3]
SAO catalog SAO 132071 [4]
Tycho catalog TYC 4757-1588-1 [5]Template: Infobox star / maintenance / specification of the TYC catalog
annotation
  1. ↑ Calculated from apparent brightness and distance.

Eta Orionis (η Orionis / η Ori, also Saiph , Algjebbah or Ensis ( Latin "double-edged long sword"; since the star represents Orion's bare weapon )) is a double star in the constellation Orion , slightly west of the Orion belt between Delta Orionis and Rigel . Eta Orionis is part of the Orion arm .

Web links

References and footnotes

  1. ↑ a b c Hipparcos catalog (ESA 1997)
  2. ↑ a b c Bright Star Catalog
  3. ↑ a b c Hipparcos, the New Reduction (van Leeuwen, 2007)
  4. ↑ Allen, RH (1899) Star-Names and Their Meanings , GE Stechert, New York, p.316.
    Saiph , however, also refers to Kappa Orionis .
  5. ↑ Moore, P. (1983) The Guinness Book of Astronomy: Facts and Feats , (2nd ed.), Guinness Superlatives Limited, Middlesex, p.230.