Theta Antliae
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 Location of θ Antliae (circled) |
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| Observation data Epoch J2000 Equinox J2000 |
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|---|---|
| Constellation | Antlia |
| Right ascension | 09h 44m 12.09512s[1] |
| Declination | -27° 46′ 10.1011″[1] |
| Apparent magnitude (V) | 4.79[2] |
| Characteristics | |
| Spectral type | A8 Vm + G7 III[3] |
| U−B color index | +0.35[2] |
| B−V color index | +0.50[2] |
| Astrometry | |
| Radial velocity (Rv) | +24.0[4] km/s |
| Proper motion (μ) | RA: -53.23[1] mas/yr Dec.: +37.24[1] mas/yr |
| Parallax (π) | 9.61 ± 0.46[1] mas |
| Distance | 340 ± 20 ly (104 ± 5 pc) |
| Details | |
| Mass | 3.1 M☉ |
| Radius | 2.1 R☉ |
| Luminosity | 40 L☉ |
| Temperature | 7,500–10,000 K |
| Orbit[5] | |
| Companion | θ Antliae B |
| Period (P) | 18.32 yr |
| Semimajor axis (a) | 0.134" |
| Eccentricity (e) | 0.445 |
| Inclination (i) | 124° |
| Longitude of the node (Ω) | 176.8° |
| Periastron epoch (T) | 1965.75 |
| Other designations | |
| Database references | |
| SIMBAD | data |
Theta Antliae (θ Ant, θ Antliae) or IDS 09397-2719 B is a binary star in the constellation Antlia. It is approximately 384 light years from Earth and has a combined apparent magnitude of +4.78.
The primary component, θ Antliae A, is a white A-type main sequence dwarf with an apparent magnitude of +5.6. The companion, θ Antliae B, is a yellow-white F-type bright giant with an apparent magnitude of +5.7. The binary has an orbital period of 18.3 years and the components are separated by 0.1 arcseconds.
[edit] References
- ^ a b c d e van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, Bibcode 2007A&A...474..653V, doi:10.1051/0004-6361:20078357
- ^ a b c Johnson, H. L. et al (1966). "UBVRIJKL photometry of the bright stars". Communications of the Lunar and Planetary Laboratory 4 (99). Bibcode 1966CoLPL...4...99J.
- ^ Ginestet, N.; Carquillat, J. M. (December 2002), "Spectral Classification of the Hot Components of a Large Sample of Stars with Composite Spectra, and Implication for the Absolute Magnitudes of the Cool Supergiant Components", The Astrophysical Journal Supplement Series 143 (2): 513–537, Bibcode 2002ApJS..143..513G, doi:10.1086/342942
- ^ Wilson, Ralph Elmer (1953). General catalogue of stellar radial velocities. Carnegie Institution of Washington. Bibcode 1953QB901.W495......
- ^ Heintz, W. D. (March 1982), "Orbits of 16 visual binaries", Astronomy and Astrophysics Supplement Series 47: 569–573, Bibcode 1982A&AS...47..569H
[edit] External links
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