HD 196885
HD 196885 is a 6th magnitude binary star in the constellation Delphinus. According to its parallax of 29.15 milliarcseconds,[1] it is located at a distance of 112 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).
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[edit] 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]
[edit] Planetary system
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity |
|---|---|---|---|---|
| b | >2.96 MJ | 2.60[6] | 1349 | 0.48 ± 0.02 |
[edit] 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.
[edit] See also
[edit] References
- ^ van Leeuwen, F. (2007). "HIP 101966". Hipparcos, the New Reduction. http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/311/hip2&recno=101615. Retrieved 2008-08-19.
- ^ "The Planet Around HD 196885". California & Carnegie Planet Search Team (Internet Archive link). Archived from the original on 2004-12-27. http://web.archive.org/web/20041227061730/http://exoplanets.org/esp/hd196885/hd196885.shtml. 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.
- ^ a b "HD 196885 A page". Geneva Observatory. http://obswww.unige.ch/exoplanets/hd196885A.html. Retrieved 2008-08-19.
- ^ Schneider, J.. "Notes for star HD 196885". The Extrasolar Planets Encyclopaedia. http://exoplanet.eu/star.php?st=HD+196885. 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. http://www.aanda.org/articles/aa/abs/2011/04/aa15433-10/aa15433-10.html. (web preprint)
- ^ Chauvin et al (2007). "Characterization of the long-period companions of the exoplanet host stars: HD 196885, HD 1237 and HD 27442" (abstract). Astronomy and Astrophysics 475 (2): 723–727. Bibcode 2007A&A...475..723C. doi:10.1051/0004-6361:20067046. http://www.aanda.org/articles/aa/abs/2007/44/aa7046-06/aa7046-06.html. (web preprint)
[edit] External links
- "HD 196885". Extrasolar Visions. http://www.extrasolar.net/planettour.asp?StarCatId=normal&StarId=262.
Coordinates: 
20h 39m 51.8756s, +11° 14′ 58.737″
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