Saiph information

Saiph
	Location of Saiph (circled)
Observation data; Epoch J2000 Equinox J2000
Constellation	Orion
Right ascension	05h 47m 45.38884s
Declination	−09° 40′ 10.5777″
Apparent magnitude (V)	2.09
Characteristics
Spectral type	B0.5 Ia
U−B color index	−1.02
B−V color index	−0.18
Variable type	Suspected
Astrometry
Radial velocity (Rv)	+20.5 km/s
Proper motion (μ)	RA: +1.46 mas/yr ; Dec.: −1.28 mas/yr
Parallax (π)	5.04 ± 0.22 mas
Distance	650 ± 30 ly ; (198 ± 9 pc)
Absolute magnitude (MV)	−6.1
Details
Mass	15.50±1.25 M☉
Radius	22.2 R☉
Luminosity	56,881 L☉
Surface gravity (log g)	2.9 cgs
Temperature	26,500 K
Rotational velocity (v sin i)	83 km/s
Age	11.1±0.5 Myr
Other designations
	κ Orionis, 53 Orionis, 141 G. Orionis, BD−09 1235, FK5 220, HD 38771, HIP 27366, HR 2004, SAO 132542.
Database references
SIMBAD	data

Saiph /ˈseɪf/, designation Kappa Orionis (κ Orionis, abbreviated Kappa Ori, κ Ori) and 53 Orionis (53 Ori), is the sixth-brightest star in the constellation of Orion. Of the four bright stars that compose Orion's main quadrangle, it is the star at the south-eastern corner. A northern-hemisphere observer facing south would see it at the lower left of Orion, and a southern-hemisphere observer facing north would see it at the upper right. Parallax measurements yield an estimated distance of 650 light-years (200 parsecs) from the Sun, which is about the same as Betelgeuse.^[1] It is smaller, less luminous but hotter at its surface than Rigel with an apparent visual magnitude of 2.1.^[2] The luminosity of this star changes slightly, varying by 0.04 magnitudes.^[4]

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Observation data Epoch J2000 Equinox J2000
Location of Saiph (circled)
Constellation	Orion
Right ascension	05^h 47^m 45.38884^s^[1]
Declination	−09° 40′ 10.5777″^[1]
Apparent magnitude (V)	2.09^[2]
Characteristics
Spectral type	B0.5 Ia^[3]
U−B color index	−1.02^[2]
B−V color index	−0.18^[2]
Variable type	Suspected^[4]
Astrometry

Radial velocity (R_v)	+20.5^[5] km/s
Proper motion (μ)	RA: +1.46^[1] mas/yr Dec.: −1.28^[1] mas/yr
Parallax (π)	5.04 ± 0.22 mas^[1]
Distance	650 ± 30 ly (198 ± 9 pc)
Absolute magnitude (M_V)	−6.1^[6]

Details

Mass	15.50±1.25^[7] `M`_☉
Radius	22.2^[6] `R`_☉
Luminosity	56,881^[7] `L`_☉
Surface gravity (log g)	2.9^[6] cgs
Temperature	26,500^[6] K
Rotational velocity (v sin i)	83^[6] km/s
Age	11.1±0.5^[8] Myr

Other designations
κ Orionis, 53 Orionis, 141 G. Orionis, BD−09 1235, FK5 220, HD 38771, HIP 27366, HR 2004, SAO 132542.^[9]
Database references
SIMBAD	data

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