HD_215497 Latitude and Longitude:
Sky map 22h 46m 36.7543s, −56° 35′ 58.322″
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HD 215497
Observation data
Epoch J2000.0       Equinox J2000.0
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  mas [1]
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
SIMBAD data
Exoplanet Archive data

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  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. ^ a b c d e f 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.
  2. ^ a b c d e f g h i j 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. arXiv: 1411.7048. Bibcode: 2010A&A...512A..48L. doi: 10.1051/0004-6361/200913523.
  3. ^ a b c d e f g h i Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv: 1108.4971. Bibcode: 2012AstL...38..331A. doi: 10.1134/S1063773712050015. S2CID  119257644.
  4. ^ a b c d e Bonfanti, A.; et al. (2016). "Age consistency between exoplanet hosts and field stars". Astronomy & Astrophysics. 585: 14. arXiv: 1511.01744. Bibcode: 2016A&A...585A...5B. doi: 10.1051/0004-6361/201527297. S2CID  53971692. A5.
  5. ^ "HD 215497". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-11-08.
  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. Bibcode: 2015MNRAS.450.3127M. doi: 10.1093/mnras/stv771. hdl: 1887/49340. 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. arXiv: 1701.01303. Bibcode: 2017A&A...601A.117G. doi: 10.1051/0004-6361/201629270. S2CID  86862862. A117.


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