Astronomy:Theta Pyxidis
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Short description: Star in the constellation Pyxis
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Pyxis |
| Right ascension | 09h 21m 29.60s[1] |
| Declination | −25° 57′ 55.5″[1] |
| Apparent magnitude (V) | 4.718[2] |
| Characteristics | |
| Evolutionary stage | AGB[3] |
| Spectral type | M0.5 III Ba0.5[4] |
| U−B color index | +1.984[2] |
| B−V color index | +1.651[2] |
| Variable type | semiregular variable[5] |
| Astrometry | |
| Radial velocity (Rv) | +20.0±2.8[6] km/s |
| Proper motion (μ) | RA: −12.24±0.40[1] mas/yr Dec.: −9.29±0.37[1] mas/yr |
| Parallax (π) | 6.49 ± 0.45[1] mas |
| Distance | 500 ± 30 ly (150 ± 10 pc) |
| Absolute magnitude (MV) | −1.22[7] |
| Details | |
| Radius | 54[8] R☉ |
| Luminosity | 970[9] L☉ |
| Temperature | 3,825[9] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
Theta Pyxidis, Latinized from θ Pyxidis, is a red M-type giant in the constellation Pyxis. It is approximately 500 ± 30 light years from Earth.[1] It is of spectral type M1III and semi-regular variable with two measured periods of 13 and 98.3 days, and an average visual magnitude of 4.71,[5] It shines with a luminosity approximately 970 times that of the Sun and has a surface temperature of 3825 K.[9] It has a diameter around 54 times that of the Sun.[8]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V
- ↑ 2.0 2.1 2.2 Gutierrez-Moreno, Adelina et al. (1966), "A System of photometric standards", Publications of the Department of Astronomy University of Chile (Publicaciones Universidad de Chile, Department de Astronomy) 1: 1–17, Bibcode: 1966PDAUC...1....1G.
- ↑ Eggen, Olin J. (1992). "Asymptotic Giant Branch Stars Near the Sun". The Astronomical Journal 104: 275. doi:10.1086/116239. Bibcode: 1992AJ....104..275E.
- ↑ Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series 71: 245. doi:10.1086/191373. Bibcode: 1989ApJS...71..245K.
- ↑ 5.0 5.1 Tabur, V.; Bedding, T.R. (2009). "Long-term photometry and periods for 261 nearby pulsating M giants". Monthly Notices of the Royal Astronomical Society 400 (4): 1945–61. doi:10.1111/j.1365-2966.2009.15588.x. Bibcode: 2009MNRAS.400.1945T.
- ↑ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics 546: 14, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D.
- ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 8.0 8.1 Pasinetti Fracassini, L. E.; Pastori, L.; Covino, S.; Pozzi, A. (2001). "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics". Astronomy & Astrophysics 367 (2): 521–24. doi:10.1051/0004-6361:20000451. Bibcode: 2001A&A...367..521P.
- ↑ 9.0 9.1 9.2 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. doi:10.1111/j.1365-2966.2012.21873.x. Bibcode: 2012MNRAS.427..343M.
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