U Antliae

U Antliae

Observation data Epoch J2000      Equinox J2000
Constellation	Antlia
Right ascension	10^h 35^m 12.852^s[1]
Declination	−39° 33′ 45.32″[1]
Apparent magnitude (V)	5.505
Characteristics
Spectral type	N:v
U−B color index	7.1
B−V color index	2.88
Variable type	LB
Astrometry
Radial velocity (Rv)	37 km/s
Proper motion (μ)	RA: −31.02 ± 0.56[1] mas/yr Dec.: 3.50 ± 0.53[1] mas/yr
Parallax (π)	3.73 ± 0.54[1] mas
Distance	approx. 900 ly (approx. 270 pc)
Absolute magnitude (MV)	−5.22[2]
Details
Mass	1.04 M☉
Radius	350 R☉
Luminosity	5819[3] L☉
Temperature	3317[3] K
Age	? years
Other designations
HR 4153, CD-38 6579, 2MASS J10351285-3933453, HD 91793, PPM 287864, AAVSO 1030-39, HIP 51821, SAO 201533.
Database references
SIMBAD	data

Coordinates: 10^h 35^m 12.8507^s, −39° 33′ 45.319″

U Antliae (U Ant) is a star in the constellation Antlia.

U Antliae is a red C-type carbon star and is an irregular variable star that varies between magnitudes 5.27 and 6.04.^[4] Approximately 900 light years from Earth, it shines with a luminosity approximately 5819 times that of the Sun and has a surface temperature of 3317 K.^[3] It is surrounded by two shells of dust, thought to have been ejected 14,000 and 10,000 years ago.^[5]

References

1. van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.Vizier catalog entry
2. Guandalini, R.; Cristallo, S. (2013). "Luminosities of carbon-rich asymptotic giant branch stars in the Milky Way". Astronomy & Astrophysics 555: 7. arXiv:1305.4203. Bibcode:2013A&A...555A.120G. doi:10.1051/0004-6361/201321225. A120.
3. McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (2012). "Fundamental Parameters and Infrared Excesses of Hipparcos Stars". Monthly Notices of the Royal Astronomical Society 427 (1): 343–57. arXiv:1208.2037. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x.
4. Otero, Sebastian (3 November 2011). "U Antliae". AAVSO Website. American Association of Variable Star Observers. Retrieved 25 July 2014.
5. Izumiura, H.; Waters, L. B. F. M.; de Jong, T.; Loup, C.; Bontekoe, Tj. R.; Kester, D. J. M. (1997). "A double dust shell surrounding the carbon star U Antliae". Astronomy and Astrophysics 323: 449–60. Bibcode:1997A&A...323..449I.