| Observation data EpochJ2000 EquinoxJ2000 | |
|---|---|
| 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±0.028mas/yr[2] Dec.: -3.998±0.019mas/yr[2] |
| Parallax (π) | 3.1004±0.0285 mas[2] |
| Distance | 1,052 ± 10 ly (323 ± 3 pc) |
| Details | |
| Mass | 1.2[4] M☉ |
| Radius | 2.1[4] R☉ |
| Luminosity | 5.6[4] L☉ |
| Surface gravity (log g) | 3.86[4] cgs |
| Temperature | 6,136[4] K |
| Rotational velocity (v sin i) | 143[5] km/s |
| Age | 4.8[6] Myr |
| Other designations | |
| HD 293782,HIP 23602, GSC 04758-00134,2MASS J05042998-0347142, Gaia DR3 3212878018378138752[7] | |
| Database references | |
| SIMBAD | data |
UX Orionis is avariable star in the constellation ofOrion. It is aHerbig Ae star, located about 1000light 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 invisual band brightness.[9][3] UX Orionis was discovered byHenrietta Swan Leavitt.[3]
UX Orionis is surrounded by acircumstellar 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]
