11h51m23.0s, +57° 38′27″
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 | 11h51m 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 | |
BD+58 1340, HIP 57820, SAO 28161, TYC 3839-00846-1, 2MASS J11512253+5738267[4] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
HD 102956 borIsagel is an extrasolar planet discovered in 2010 by a team of American astronomers led by John Johnson using Doppler spectroscopy and the Keck ObservatoryinHawaii. 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.
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.
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]
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.
