25 Orionis

25 Orionis, ψ¹ Orionis
	; 25 Orionis is located roughly between δ Ori and γ Ori.
Observation data; Epoch J2000 Equinox J2000
Constellation	Orion
Right ascension	05h 24m 44.82738s
Declination	01° 50′ 47.2019″
Apparent magnitude (V)	4.92 - 4.96
Characteristics
Spectral type	B1Vn
U−B color index	−0.92
B−V color index	−0.20
Variable type	γ Cas
Astrometry
Radial velocity (Rv)	19.3 ± 2 km/s
Proper motion (μ)	RA: +1.047 mas/yr ; Dec.: +0.433 mas/yr
Parallax (π)	2.9321±0.1219 mas
Distance	1,110 ± 50 ly ; (340 ± 10 pc)
Details
Mass	10.5 M☉
Radius	6.4 R☉
Luminosity	10,500 L☉
Surface gravity (log g)	4.0 cgs
Temperature	24,661 ± 339 K
Rotational velocity (v sin i)	316 km/s
Age	~100 Myr
Other designations
	ψ1 Ori, 25 Ori, V1086 Ori, BD+01 1005, FK5 2406, HD 35439, HIP 25302, HR 1789, SAO 112734, CCDM J05247+0150A
Database references
SIMBAD	data

25 Orionis, less commonly known by its Bayer designation Psi¹ Orionis (ψ¹ Orionis, ψ¹ Ori) is a fifth-magnitude star in the constellation Orion. It lies among a dense cluster of low-mass pre-main-sequence stars in the Orion OB1a.

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Observation data Epoch J2000 Equinox J2000
25 Orionis is located roughly between δ Ori and γ Ori.
Constellation	Orion
Right ascension	05^h 24^m 44.82738^s^[1]
Declination	01° 50′ 47.2019″^[1]
Apparent magnitude (V)	4.92 - 4.96^[2]
Characteristics
Spectral type	B1Vn^[3]
U−B color index	−0.92^[4]
B−V color index	−0.20^[4]
Variable type	γ Cas^[2]
Astrometry

Radial velocity (R_v)	19.3 ± 2^[5] km/s
Proper motion (μ)	RA: +1.047^[1] mas/yr Dec.: +0.433^[1] mas/yr
Parallax (π)	2.9321±0.1219 mas^[1]
Distance	1,110 ± 50 ly (340 ± 10 pc)

Details

Mass	10.5^[6] `M`_☉
Radius	6.4^[7] `R`_☉
Luminosity	10,500^[6] `L`_☉
Surface gravity (log g)	4.0^[7] cgs
Temperature	24,661 ± 339^[7] K
Rotational velocity (v sin i)	316^[8] km/s
Age	~100^[6] Myr

Other designations
ψ¹ Ori, 25 Ori, V1086 Ori, BD+01 1005, FK5 2406, HD 35439, HIP 25302, HR 1789, SAO 112734, CCDM J05247+0150A^[3]
Database references
SIMBAD	data

25 Orionis

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