UX Orionis

UX Orionis

A visual band light curve for UX Orionis, plotted from ASAS data[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Orion
Right ascension 05h 04m 29.9879s[2]
Declination −03° 47′ 14.2867″[2]
Apparent magnitude (V) 9.48 – 12.5[3]
Characteristics
Spectral type A3ea[3]
Astrometry
Proper motion (μ) RA: 1.056±0.028 mas/yr[2]
Dec.: -3.998±0.019 mas/yr[2]
Parallax (π)3.1004 ± 0.0285 mas[2]
Distance1,052 ± 10 ly
(323 ± 3 pc)
Details
Mass1.2[4] M☉
Radius2.1[4] R☉
Luminosity5.6[4] L☉
Surface gravity (log g)3.86[4] cgs
Temperature6,136[4] K
Rotational velocity (v sin i)143[5] km/s
Age4.8[6] Myr
Other designations
HD 293782, HIP 23602, GSC 04758-00134, 2MASS J05042998-0347142, Gaia DR3 3212878018378138752[7]
Database references
SIMBADdata

UX Orionis is a variable star in the constellation of Orion. It is a Herbig Ae star, located about 1000 light years from the Earth.[8] At its brightest it is a magnitude 9.5 object, so it is too faint to be seen with the naked eye.[3] UX Orionis is the prototype of the UX Orionis class of variable stars (often called "UXors"), which are young stellar objects that exhibit large (greater than 2.8 magnitude), irregular changes in visual band brightness.[9][3] UX Orionis was discovered by Henrietta Swan Leavitt.[3]

UX Orionis is surrounded by a circumstellar disk, and the star's photometric variability appears to be caused by episodes during which the star is obscured by dusty material within the circumstellar disk.[8]

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  2. ^ a b c d Cite error: The named reference DR3 was invoked but never defined (see the help page).
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  4. ^ a b c d e Cite error: The named reference ticv8 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference glebocki2005 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference manoj2006 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Kreplin was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Herbst was invoked but never defined (see the help page).