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Pi4 Orionis

This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. (December 2009) p4 Orionis The location of Pi4 Orionis (p4) in the constellation of Orion. Observation data Epoch J2000      Equinox J2000 Constellation Orion Right ascension 04h 51m 12.4s Declination 05° 36' 18.4? Apparent magnitude (V) 3.67 Characteristics Spectral type B2 III U-B color index -0.81 B-V color index -0.16 Astrometry Radial velocity (Rv) 23.3 km/s Proper motion (µ) RA: -3.62 mas/yr Dec.: 1.03 mas/yr Parallax (p) 2.59 ± 0.80 mas Distance approx. 1,300 ly (approx. 400 pc) Details Radius 9.1 R? Surface gravity (log g) 3.5 cgs Temperature 21,874 ± 126 K Other designations Database references SIMBAD data Pi4 Orionis (p4 Ori, p4 Orionis) is a spectroscopic binary star in the constellation Orion. It is about 1,300 light years away and is one of the most luminous stars known. It is one of a series of stars that share the Bayer designation Pi Orionis. ^ a b c Cite error: The named reference mnras189_601 was invoked but never defined (see the help page).
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