18 Delphini b
| Extrasolar planet | List of extrasolar planets | |
|---|---|---|
 | ||
| Parent star | ||
| Star | 18 Delphini | |
| Constellation | Delphinus | |
| Right ascension | (α) | 20h 58m 26s |
| Declination | (δ) | +10° 50′ 21″ |
| Apparent magnitude | (mV) | 5.52 |
| Distance | 238 ± 11 ly (73.1 ± 3.5 pc) | |
| Spectral type | G6III | |
| Orbital elements | ||
| Semimajor axis | (a) | 2.6 AU (390 Gm) |
| 35 mas | ||
| Periastron | (q) | 2.4 AU (360 Gm) |
| Apastron | (Q) | 2.8 AU (420 Gm) |
| Eccentricity | (e) | 0.08 ± 0.01 |
| Orbital period | (P) | 993.3 ± 3.2 d (2.719 y) |
| Argument of periastron |
(ω) | 166.1 ± 6.5° |
| Time of periastron | (T0) | 2451672 ± 18 JD |
| Physical characteristics | ||
| Minimum mass | (m sin i) | 10.3 MJ |
| Discovery information | ||
| Discovery date | 19 February 2008 | |
| Discoverer(s) | Sato et al.[1] | |
| Discovery method | radial velocity | |
| Discovery site | Okayama Planet Search Program  Japan | |
| Discovery status | Published[1] | |
| Other designations | ||
| HD 199665 b, HIP 103527 b, HR 8030 b | ||
| Database references | ||
| Extrasolar Planets Encyclopaedia | data | |
| SIMBAD | data | |
| Exoplanet Archive | data | |
| Open Exoplanet Catalogue | data | |
18 Delphini b or 18 Del b is a very massive and dense planet approximately 238 light-years away in the constellation of Delphinus. The planet orbits the yellow giant star 18 Delphini. The planet has a minimum mass of 10.3 MJ and a period of 993 days. This planet was discovered on February 19, 2008 by Sato.[1]
Radial velocity changes over time of 18 Delphini caused by the orbit of 18 Delphini b.
See also
References
- ↑ 1.0 1.1 1.2 Sato, Bun'ei et al. (2008). "Planetary Companions around Three Intermediate-Mass G and K Giants: 18 Delphini, ξ Aquilae and HD 81688". Publications of the Astronomical Society of Japan 60 (3): 539–550. arXiv:0802.2590. Bibcode:2008PASJ...60..539S. doi:10.1093/pasj/60.3.539.
- Jean Schneider (2011). "Notes for Planet 18 Del b". Extrasolar Planets Encyclopaedia. Retrieved 30 September 2011.
External links
- da Silva, L. et al. (November 2006), "Basic physical parameters of a selected sample of evolved stars", Astronomy and Astrophysics 458 (2): 609–623, arXiv:astro-ph/0608160, Bibcode:2006A&A...458..609D, doi:10.1051/0004-6361:20065105 – lists data about the star.
