25 Orionis

For other stars with this Bayer designation, see ψ 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[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 (Rv)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]
Distance1,110 ± 50 ly
(340 ± 10 pc)
Details
Mass10.5[6] M☉
Radius6.4[7] R☉
Luminosity10,500[6] L☉
Surface gravity (log g)4.0[7] cgs
Temperature24,661 ± 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
SIMBADdata

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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  7. ^ a b c Cite error: The named reference mnras189_601 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference HR25ORI was invoked but never defined (see the help page).