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] |
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 | |
Database references | |
SIMBAD | data |
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]
Nu Caeli is a yellow-white hued star in the constellation Caelum. It has an apparent visual magnitude of 6.07, which indicates it is near the lower limit on brightness that is visible to the naked eye. According to the Bortle scale, the star can be viewed from dark suburban skies. Based upon an annual parallax shift of 20.3 mas as seen from Earth, this star is located 161 light years from the Sun.
13 Vulpeculae is a blue giant with a stellar classification of class B9.5III in the northern constellation Vulpecula. It is visible to the naked eye as a faint, blue-white hued star with an apparent visual magnitude of 4.57 and it is approximately 339 light years away from the Sun based on parallax. The star is radiating 180 times the luminosity of the Sun from its photosphere at an effective temperature of 8,801 K.
15 Vulpeculae is a variable star in the northern constellation of Vulpecula, located approximately 243 light years away based on parallax. It has the variable star designation NT Vulpeculae; 15 Vulpeculae is the Flamsteed designation. It is visible to the naked eye as a faint, white-hued star with a typical apparent visual magnitude of 4.66. This object is moving closer to the Earth with a heliocentric radial velocity of −26 km/s.
49 Cassiopeiae is a binary star system in the northern circumpolar constellation of Cassiopeia. It is visible to the naked eye as a faint, yellow-hued point of light with an apparent visual magnitude of 5.22. The system is located about 412 light years away from the Sun, based on parallax. The pair had an angular separation of 5.40″ along a position angle of 244°, as of 2008, with the brighter component being of magnitude 5.32 and its faint companion having magnitude 12.30.
Xi Leonis is a solitary star in the zodiac constellation of Leo. It has an apparent visual magnitude of 5.0 and is faintly visible to the naked eye. The distance to this star, as determined by parallax measurements, is roughly 229 light years.
HD 204521 is a star in the northern constellation of Cepheus. In the sky it positioned just to the west of the magnitude 3.2 star Beta Cephei. This object has a yellow hue similar to the Sun but is too faint to be visible to the naked eye with an apparent visual magnitude of 7.26. It is located at a distance of 86 light years from the Sun based on parallax, and has an absolute magnitude of 5.15. The star is drifting closer with a radial velocity of −77 km/s, and is predicted to come to within 7.96 light-years in 334,000 years. At that distance the star can have a relatively small perturbing effect on comets in the Oort cloud.
V381 Cephei is a triple star system in the northern constellation of Cepheus. Its apparent magnitude is slightly variable between 5.5 and 5.7.
Zeta Chamaeleontis, Latinized from ζ Chamaeleontis, is a star located in the constellation Chamaeleon. Located around 540 light-years distant, it shines with a luminosity approximately 522 times that of the Sun and has a surface temperature of 15,655 K.
HD 102839 is a class G6Ib star in the constellation Musca. Its apparent magnitude is 4.98 and it is approximately 1,550 light years away from Earth based on parallax.
π Pavonis, Latinized as Pi Pavonis, is a candidate astrometric binary star system in the constellation Pavo. It is a white-hued star that is visible to the naked eye as a faint point of light with an apparent visual magnitude of 4.33. The distance to this object is 130 light years based on parallax, but it is drifting closer to the Sun with a radial velocity of −15.6 km/s.
Phi1 Pavonis, latinized from φ1 Pavonis, is a single star in the southern constellation of Pavo. It has a yellow-white hue and is faintly visible to the naked eye with an apparent visual magnitude of 4.75. The star is located at a distance of approximately 92 light years away based on parallax. It is drifting closer to the Sun with a radial velocity of −20 km/s.
Rho Pavonis, Latinized from ρ Pavonis, is a single, variable star in the southern constellation of Pavo. It is yellow-white in hue and faintly visible to the naked eye with an apparent visual magnitude that fluctuates around 4.86. The star is located at a distance of approximately 190 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +8 km/s. It is a candidate outlying member of the Tucana Association of co-moving stars.
V Puppis is a star system in the constellation Puppis. Its apparent magnitude is 4.41. There is a binary star system at the center with a B1 dwarf orbiting a B3 subgiant star. They have an orbital period of 1.45 days and a distance of only 15 solar radii apart. However, the system moves back and forth, indicating that there is a massive object orbiting them with a period around 5.47 years. Based on the mass of the object, its lack of a visible spectrum, and circumstellar matter in the system with many heavy elements, it is probably a black hole. However, a follow-up study could not confirm this object, but found signs that there may be a third object which is fainter than the other components.
QZ Puppis is a class B2.5V star in the constellation Puppis. Its apparent magnitude is 4.5 and it is approximately 650 light years away based on parallax.
1 Puppis is a single star in the southern constellation of Puppis. It lies in the northern part of the constellation at a distance of about 790 ly, east of Aludra in Canis Major and just north of the white supergiant, 3 Puppis. This object is visible to the naked eye as a faint, red-hued star with an apparent visual magnitude of 4.59. It is moving further from the Earth with a heliocentric radial velocity of +32.4 km/s.
HD 59890 is a class G3Ib yellow supergiant star in the constellation Puppis. Its apparent magnitude is 4.65 and it is approximately 1,360 light years away based on parallax.
HD 54893, often called A Puppis is a suspected variable star in the constellation Puppis. Its apparent magnitude is 4.83 and is approximately 860 light years away based on parallax.
36 Camelopardalis is a single star in the northern circumpolar constellation of Camelopardalis. It is visible to the naked eye as a dim point of light with an apparent visual magnitude of +5.3. Parallax measurements provide a distance estimate of approximately 710 light years away from the Sun, and it is drifting away from the Earth with a radial velocity of −1.15 km/s.
50 Camelopardalis is a double star in the northern constellation of Lynx. This object is visible to the naked eye as a faint white star with an apparent visual magnitude of 5.4. It is 430 light years away and moving further from the Earth with a heliocentric radial velocity of 20 km/s.
57 Geminorum is a yellow giant star in the constellation Gemini, with an apparent magnitude of 5.0. At a distance of about 179 light years, it has a luminosity about 29 times the Sun's. With an age of about 1.2 billion years, it has evolved away from the main sequence and expanded to seven times the width of the Sun.