HD 102956 b

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.

HD 102956 b / Isagel
Artist's impression HD 102956 b
Discovery[1]
Discovered byJohnson et al.
Discovery siteKeck Observatory
Discovery date2010
Doppler spectroscopy
Orbital characteristics[2]
0.0807±0.0073 AU
Eccentricity0.037±0.019
6.49470±0.00019 d
2455351.45±0.64 JD
301±33 º
Semi-amplitude74.6±1.8 m/s
StarHD 102956
Physical characteristics[2]
Mass≥0.960±0.023 MJ
    HD 102956
    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]
    Distance399 ± 1 ly
    (122.3 ± 0.4 pc)
    Absolute magnitude (MV)2.5
    Details
    Mass1.68±0.11 M☉
    Radius4.4±0.1 R☉
    Luminosity (visual, LV)11.6±0.5 L☉
    Temperature5054±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
    SIMBADdata
    Exoplanet Archivedata

    Discovery and nomenclature

    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

    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

    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
    1. 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.
    2. 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.
    3. 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.
    4. "HD 102956". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-09-21.
    5. "Name an exoplanet (press release)". 2019-06-06. Archived from the original on 2019-06-08. Retrieved 2019-06-13.
    6. "Rymddikt gav namn åt Sveriges exoplanet" (in Swedish). 2019-12-17. Archived from the original on 2020-01-12. Retrieved 2021-08-10.
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