HD 102956 b
 Artist's impression HD 102956 b | |
| Discovery[1] | |
|---|---|
| Discovered by | Johnson et al. |
| Discovery site | Keck Observatory |
| Discovery date | 2010 |
| Doppler spectroscopy | |
| Orbital characteristics[2] | |
| 0.0807±0.0073 AU | |
| Eccentricity | 0.037±0.019 |
| 6.49470±0.00019 d | |
| 2455351.45±0.64 JD | |
| 301±33 º | |
| Semi-amplitude | 74.6±1.8 m/s |
| Star | HD 102956 |
| Physical characteristics[2] | |
| Mass | ≥0.960±0.023 MJ |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ursa Major |
| Right ascension | 11h 51m 22.5111s[3] |
| Declination | +57° 38′ 26.6427″[3] |
| Characteristics | |
| Evolutionary stage | Main sequence |
| Spectral type | A |
| Astrometry | |
| Radial velocity (Rv) | −25±83 km/s |
| Proper motion (μ) | RA: −11.24±0.049[3] mas/yr Dec.: −17.578±0.049[3] mas/yr |
| Parallax (π) | 8.1753 ± 0.0290 mas[3] |
| Distance | 399 ± 1 ly (122.3 ± 0.4 pc) |
| Absolute magnitude (MV) | 2.5 |
| Details | |
| Mass | 1.68±0.11 M☉ |
| Radius | 4.4±0.1 R☉ |
| Luminosity (visual, LV) | 11.6±0.5 L☉ |
| Temperature | 5054±44 K |
| Metallicity [Fe/H] | +0.19±0.04 dex |
| Rotational velocity (v sin i) | 0.30 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
HD 102956 b or Isagel is an extrasolar planet discovered in 2010 by a team of American astronomers led by John Johnson using Doppler spectroscopy and the Keck Observatory in Hawaii. HD 102956 b is in the orbit of host star HD 102956. The planet is at most the mass of Jupiter, orbiting every 6.5 days at a distance of 12 million km. HD 202956 b has a very circular orbit.[1] The system is roughly 399 light years from us.
Discovery and nomenclature
[edit]
The name HD 102956 derives directly from the fact that the star is the 102,956th star catalogued in the Henry Draper catalog. The designation of b is given to the first planet orbiting a given star.
The star is one of the 2.5 million brightest stars in the sky and is part of the Tycho-2 Catalogue. It is not visible to the naked eye with an apparent magnitude of 8.
NameExoWorlds
[edit]In 2019 this planet was announced as part of the IAU NameExoWorlds project[5] where it was designated as the planet that will be named by Sweden. The winning proposal was Isagel, from Nobel laureate Harry Martinson's space poem Aniara.[6]
Host star
[edit]HD 102956 (Aniara) is an orange subgiant with a mass and radius of 1.68 M☉ and 4.4 R☉, respectively. The surface temperature is about 5,054 K (4,781 °C). The star is 11.6 times brighter than the Sun. The star's age is estimated at 2.3 billion years.
References
[edit]- ^ a b Johnson, John Asher; et al. (2010). "A Hot Jupiter Orbiting the 1.7 M☉ Subgiant HD 102956". The Astrophysical Journal Letters. 721 (2): L153–L157. arXiv:1007.4555. Bibcode:2010ApJ...721L.153J. doi:10.1088/2041-8205/721/2/L153.
- ^ a b Luhn, Jacob K.; et al. (2019). "Retired A Stars and Their Companions. VIII. 15 New Planetary Signals around Subgiants and Transit Parameters for California Planet Search Planets with Subgiant Hosts". The Astronomical Journal. 157 (4). 149. arXiv:1811.03043. Bibcode:2019AJ....157..149L. doi:10.3847/1538-3881/aaf5d0. S2CID 102486961.
- ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ "HD 102956". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-09-21.
- ^ "Name an exoplanet (press release)". 2019-06-06. Archived from the original on 2019-06-08. Retrieved 2019-06-13.
- ^ "Rymddikt gav namn åt Sveriges exoplanet" (in Swedish). 2019-12-17. Archived from the original on 2020-01-12. Retrieved 2021-08-10.