HIP 116454 b
| Exoplanet | List of exoplanets | |
|---|---|---|
| Parent star | ||
| Star | HIP 116454 | |
| Constellation | Pisces | |
| Right ascension | (α) | 23h 35m 49.28138s |
| Declination | (δ) | +00° 26′ 43.8578″ |
| Distance | 180.04±17.61 ly (55.2±5.4 pc) | |
| Spectral type | K0 | |
| Mass | (m) | 0.775±0.027 M☉ |
| Radius | (r) | 0.716±0.024 R☉ |
| Temperature | (T) | 5089±50 K |
| Metallicity | [Fe/H] | −0.16±0.08 |
| Age | ≈2 Gyr | |
| Orbital elements Epoch 2456907.89 (J2000) | ||
| Semi-major axis | (a) | 0.0906±0.0049 AU |
| Eccentricity | (e) | 0.205±0.072 |
| Orbital period | (P) | 9.1205±0.0005 d |
| Inclination | (i) | 88.43±0.40° |
| Argument of periastron |
(ω) | −59.1±16.7° |
| Physical characteristics | ||
| Mass | (m) | 11.82±1.33 M⊕ |
| Radius | (r) | 2.53±0.18 R⊕ |
| Density | (ρ) | 4.17±1.08 g cm−3 |
| Temperature | (T) | 690 ± 14 K (416.9 ± 14.0 °C; 782.3 ± 25.2 °F) |
| Discovery information | ||
| Discovery date | February 2014[1] | |
| Discoverer(s) | Vanderburg, et al. | |
| Discovery method | Transit | |
| Discovery site | Kepler | |
| Discovery status | Published | |
| Other designations | ||
| 2MASS J23354927+0026436 b, WDS J23358+0027 A b, EPIC 60021410 b, TYC 0585-00774-1 b, BD-00 4534 b, K2-2 b, WISE J233549.11+002641.9 b, PPM 174245 b, UCAC2 31966721 b, USNO-B1.0 0904-00582461 b | ||
| Database references | ||
| Extrasolar Planets Encyclopaedia | data | |
| SIMBAD | data | |
| Exoplanet Archive | data | |
| Open Exoplanet Catalogue | data | |
HIP 116454 b, or K2-2 b,[2] is an exoplanet orbiting the star HIP 116454, 55 parsecs (180 ly) from Earth toward the constellation Pisces. It is 32,000 kilometres (20,000 mi) in diameter and 12 times as massive as Earth.[3][4] It was discovered by the NASA Kepler spacecraft, and is the first exoplanet discovered during Kepler's K2 mission.[5] The discovery was announced on December 18, 2014. HIP 116454 b does not have a normal Kepler designation due to not being located in the original Kepler field.[5]
HIP 116454 b was discovered in a Kepler engineering data set which was collected in preparation of the first full K2 campaign. Unlike most other Kepler planets, only a single transit event of HIP 116454 b was detected, requiring follow-up radial velocity measurements by the HARPS-N spectrograph and photometric measurements by the Canadian MOST satellite.[1][6]
Physical characteristics of HIP 116454 b are expected to be similar to Kepler-68b, being somewhere between super-Earth and mini-Neptune.[1]
References
- 1 2 3 Vanderburg, Andrew; Montet, Benjamin T.; Johnson, John Asher; Buchhave, Lars A.; Zeng, Li; et al. (February 2015). "Characterizing K2 Planet Discoveries: A super-Earth transiting the bright K-dwarf HIP 116454". The Astrophysical Journal. 800 (1). 59. Bibcode:2015ApJ...800...59V. arXiv:1412.5674
. doi:10.1088/0004-637X/800/1/59. - ↑ "HIP 116454 b". NASA Exoplanet Archive. Retrieved February 7, 2015.
- ↑ Overbye, Dennis (December 19, 2014). "Kepler Spacecraft Finds New 'Super-Earth' 180 Light-Years Away". The New York Times. Retrieved December 19, 2014.
- ↑ Wall, Mike (December 18, 2014). "NASA's Kepler Spacecraft Finds 1st Alien Planet of New Mission". Yahoo! News. Retrieved December 19, 2014.
- 1 2 Chou, Felicia; Johnson, Michele (December 18, 2014). "NASA's Kepler Reborn, Makes First Exoplanet Find of New Mission". NASA. Release 14-335. Retrieved December 19, 2014.
- ↑ Shore, Randy (December 18, 2014). "UBC astronomers help spot new 'waterworld' planet in our (galactic) neighbourhood". The Province. Retrieved December 18, 2014.