Categories
  • Tucana (constellation)
  • Durchmusterung objects
  • Henry Draper Catalogue objects
  • Hipparcos objects
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    HD 215497

    Topic: Astronomy

     From Handwiki - Reading time: 3 min
    Short description: Star in the constellation Tucana
    HD 215497
    Observation data
    Equinox J2000.0]] (ICRS)
    Constellation Tucana
    Right ascension  22h 46m 36.75396s[1]
    Declination −56° 35′ 58.3285″[1]
    Apparent magnitude (V) 8.96[2]
    Characteristics
    Spectral type K3V[2]
    Apparent magnitude (B) 9.913[3]
    Apparent magnitude (J) 7.339±0.024[3]
    Apparent magnitude (H) 6.917±0.053[3]
    Apparent magnitude (K) 6.784±0.024[3]
    B−V color index 0.953±0.025[3]
    Astrometry
    Radial velocity (Rv)+49.31[3] km/s
    Proper motion (μ) RA: −54.660±0.041[1] mas/yr
    Dec.: −61.028±0.045[1] mas/yr
    Parallax (π)24.6339 ± 0.0324[1] mas
    Distance132.4 ± 0.2 ly
    (40.59 ± 0.05 pc)
    Absolute magnitude (MV)5.77[3]
    Details[4]
    Mass0.86±0.02 M☉
    Radius0.87±0.02 R☉
    Luminosity0.47±0.02 L☉
    Surface gravity (log g)4.49±0.03 cgs
    Temperature5,128±12 K
    Metallicity [Fe/H]0.23±0.07[2] dex
    Rotational velocity (v sin i)1.67[2] km/s
    Age9.9±2.8 Gyr
    Other designations
    CPD−57°10139, HD 215497, HIP 112441, SAO 247578, PPM 350516, TYC 8826-00247-1, 2MASS J22463675-5635584[5]
    Database references
    SIMBADdata
    Exoplanet Archivedata

    HD 215497 is a single[4] star in the southern constellation of Tucana. It has an orange hue with an apparent visual magnitude of 8.96,[2] which is too dim to be viewed with the naked eye. A 2015 survey ruled out the existence of any stellar companions at projected distances from 26 to 300 astronomical units.[6] Based on parallax measurements,[1] it is located at a distance of 132 light years from the Sun. The star is drifting further away with a radial velocity of +49 km/s, having come as close as 45 light-years some 774,000 years ago.[3] The absolute magnitude of this star is 5.77.[3]

    The stellar classification of HD 215497 is K3V,[2] indicating this is a K-type main-sequence star that is generating energy through core hydrogen fusion. The star is about ten[4] billion years old with a low magnetic activity level and is spinning with a projected rotational velocity of 1.67 km/s.[2] It is smaller than the Sun, with 86% of the Sun's mass and 87% of the radius.[4] This is a metal-rich star, which means the abundance of heavier elements in the atmosphere is significantly higher than in the Sun.[2] It is radiating 47% of the luminosity of the Sun from its photosphere at an effective temperature of 5,128 K.[4]

    Planetary system

    Announced in 2009, two extrasolar planets were discovered to be orbiting the star.[2] Both planets are less massive than Jupiter. The inner exoplanet HD 215497 b orbits very close to the star and is termed a "hot super-Earth". The outer exoplanet HD 215497 c is a giant planet that orbits a little bit further from the star than the Earth, at around 1.282 astronomical unit|AU, with a high eccentricity. A check for transits of the inner planet did not reveal any passages.[7]

    The HD 215497 planetary system[2]
    Companion
    (in order from star)     		Mass Semimajor axis
    (AU)     		Orbital period
    (days)     		Eccentricity Inclination Radius
    b ≥6.6 M⊕ 0.047 3.93404 ± 0.00066 0.16 ± 0.09 — —
    c ≥0.33 MJ 1.282 567.94 ± 2.70 0.49 ± 0.04 — —

    References

    1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
    2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 Lo Curto, G. et al. (2015). "The HARPS search for southern extra-solar planets. XXII. Multiple planet systems from the HARPS volume limited sample". Astronomy and Astrophysics 512: A48. doi:10.1051/0004-6361/200913523. Bibcode: 2010A&A...512A..48L. https://www.aanda.org/articles/aa/full_html/2010/04/aa13523-09/aa13523-09.html. 
    3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. 
    4. ↑ 4.0 4.1 4.2 4.3 4.4 Bonfanti, A. et al. (2016). "Age consistency between exoplanet hosts and field stars". Astronomy & Astrophysics 585: 14. doi:10.1051/0004-6361/201527297. A5. Bibcode: 2016A&A...585A...5B. 
    5. ↑ "HD 215497". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+215497. 
    6. ↑ Mugrauer, M.; Ginski, C. (12 May 2015). "High-contrast imaging search for stellar and substellar companions of exoplanet host stars". Monthly Notices of the Royal Astronomical Society 450 (3): 3127–3136. doi:10.1093/mnras/stv771. Bibcode: 2015MNRAS.450.3127M. https://academic.oup.com/mnras/article/450/3/3127/1063872. Retrieved 19 June 2020. 
    7. ↑ Gillon, M. et al. (May 2017). "The Spitzer search for the transits of HARPS low-mass planets. II. Null results for 19 planets". Astronomy & Astrophysics 601: 23. doi:10.1051/0004-6361/201629270. A117. Bibcode: 2017A&A...601A.117G. 

    Coordinates: Sky map 22h 46m 36.7543s, −56° 35′ 58.322″



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