HD 196885
HD 196885 is a 6th magnitude binary star in the constellation Delphinus. According to its parallax of 29.83 milliarcseconds,[1] it is located at a distance of 109 light years from Earth. In 2004, a planet was announced to be orbiting the star in a 386-day orbit.[2] Follow-up work published in 2008 did not confirm the original candidate but instead found evidence of a planet in a 1349-day orbit.[3]
The star BD+10 4351B, located 192 arcseconds away from HD 196885 is located at the same distance and may be a physically bound companion star, in which case HD 196885 is a triple system.[4] If it is bound, then the separation is at least 6600 AU (the separation along the line-of-sight is unknown, so this value represents a lower limit on the true separation).
HD 196885 A
Observation data Epoch 2000 Equinox 2000 | |
---|---|
Constellation | Delphinus |
Right ascension | 20h 39m 51.8756s |
Declination | +11° 14′ 58.737″ |
Apparent magnitude (V) | 6.39 |
Distance | 112 ly (34.3 pc) |
Spectral type | F8IV |
Other designations | |
Database references | |
SIMBAD | data |
Extrasolar Planets Encyclopaedia | data |
HD 196885 A is an F6IV star. It has a mass of 1.33 solar masses and a radius of 1.79 times that of our Sun.[5]
Planetary system
Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | >2.96 MJ | 2.60[6] | 1349 | 0.48 ± 0.02 | — | — |
HD 196885 B
Observation data Epoch 2000 Equinox 2000 | |
---|---|
Constellation | Delphinus |
Right ascension | 20h 39m 51s |
Declination | +11° 14′ 58″ |
Distance | 112 ly (34.3 pc) |
Spectral type | M1V |
HD 196885 B is a red dwarf star separated by 0.7 arcseconds from the primary star.[4] At a distance of 112 light years, this corresponds to a separation of 24 AU between the stars.[7] Since the separation along the line-of-sight is unknown, this represents a lower limit on the true separation.
See also
References
- ↑ 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
- ↑ "The Planet Around HD 196885". California & Carnegie Planet Search Team (Internet Archive link). Archived from the original on 2004-12-27. Retrieved 2008-08-19.
- ↑ Correia, A. C. M.; Udry, S.; Mayor, M.; Eggenberger, A.; Naef, D.; Beuzit, J.-L.; Perrier, C.; Queloz, D.; Sivan, J.-P.; Pepe, F.; Santos, N. C.; Ségransan, D. (2008). "The ELODIE survey for northern extra-solar planets. IV. HD 196885, a close binary star with a 3.7-year planet". Astronomy and Astrophysics. 479 (1): 271–275. Bibcode:2008A&A...479..271C. doi:10.1051/0004-6361:20078908.
- 1 2 "HD 196885 A page". Geneva Observatory. Retrieved 2008-08-19.
- ↑ Schneider, J. "Notes for star HD 196885". The Extrasolar Planets Encyclopaedia. Retrieved 2008-08-19.
- ↑ Chauvin; et al. (2011). "Planetary systems in close binary stars: the case of HD 196885" (abstract). Astronomy and Astrophysics. 528: A8. Bibcode:2011A&A...528A...8C. doi:10.1051/0004-6361/201015433. (web preprint)
- ↑ Chauvin, G.; et al. (2007). "Characterization of the long-period companions of the exoplanet host stars: HD 196885, HD 1237 and HD 27442". Astronomy and Astrophysics. 475 (2): 723–727. arXiv:0710.5918. Bibcode:2007A&A...475..723C. doi:10.1051/0004-6361:20067046.
External links
Coordinates: 20h 39m 51.8756s, +11° 14′ 58.737″