25 Orionis

Coordinates: Sky map 05h 24m 44.80s, +01° 50′ 47.0″
Source: Wikipedia, the free encyclopedia.
For other stars with this Bayer designation, see ψ Orionis.
25 Orionis, ψ1 Orionis
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]
Distance
1,110 ± 50 ly
(340 ± 10 pc)
Details
Myr
HR 1789, SAO 112734, CCDM J05247+0150A[3]
Database references
SIMBADdata

25 Orionis, less commonly known by its

Orion OB1a
.

Stellar group

25 Orionis is the dominant member of a rich low-mass star region,

eruptive variable V346 Tauri.[11]
This region is known as Briceño 1.

Properties

A light curve for V1086 Orionis, plotted from Hipparcos data[12]

Like the star

circumstellar disk. The SIMBAD astronomical database lists its spectral class as B1Vn.[3]

25 Orionis is a fast rotator, clocking a rotational velocity of 316 km/s, significantly faster than Achernar's speed of 251 km/s in the constellation Eridanus.[8][13] Having a radius of 6 R☉, the star rotates on its axis roughly once every 23 hours. With a mass in excess of 10 M☉, the star is expected to explode as a supernova.[6]

25 Orionis is a

General Catalog of Variable Stars lists its magnitude as varying between magnitude 4.92 and 4.96 in the visual (V) band - an amplitude only 0.04 magnitudes.[2] However photometry by the Hipparcos satellite, which had a passband broader than the V band, showed a 0.145 magnitude range in brightness.[14][15]

See also

References

  1. ^
    S2CID 244398875
    . Gaia DR3 record for this source at VizieR.
  2. ^
    Bibcode:2009yCat....102025S
    .
  3. ^ a b c "* 25 Ori". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2010-11-07.
  4. ^
    Bibcode:1966CoLPL...4...99J
    .
  5. Bibcode:1953GCRV..C......0W
    .
  6. ^
    University of Illinois
    . Retrieved 2010-11-07.
  7. ^
    doi:10.1093/mnras/189.3.601
    .
  8. ^
    Centre de Données astronomiques de Strasbourg. Retrieved 2010-11-07. {{cite book}}: |work= ignored (help
    )
  9. S2CID 118950935
    .
  10. S2CID 56292154
    .
  11. S2CID 119087968
    .
  12. ^ "/ftp/cats/more/HIP/cdroms/cats". Centre de Données astronomiques de Strasbourg. Strasbourg astronomical Data Center. Retrieved 15 October 2022.
  13. Centre de Données astronomiques de Strasbourg
    . Retrieved 2010-11-08.
  14. doi:10.1051/0004-6361/200912304
    .
  15. doi:10.1051/0004-6361/200912304
    .

External links


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