HD 215497

HD 215497 is a star located approximately 132 light-years away in the constellation of Tucana. It is a K3V star with the characteristics very similar to the Sun.

HD 215497
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Tucana
Right ascension  22h 46m 36.7540s[1]
Declination −56° 35′ 58.3285″[1]
Apparent magnitude (V) 8.96[2]
Characteristics
Spectral type K3V[2]
Apparent magnitude (B) 9.92
Apparent magnitude (J) 7.339
Apparent magnitude (H) 6.917
Apparent magnitude (K) 6.784
B−V color index 0.95
Variable type none
Astrometry
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
Details
Mass0.872 ± 0.023[2] M☉
Radius1.01 ± 0.11 R☉
Luminosity0.39[2] L☉
Surface gravity (log g)4.31 ± 0.17[2] cgs
Temperature5113 ± 93[2] K
Metallicity0.23 ± 0.07[2]
Other designations
CPD−57°10139, HIP 112441, SAO 247578, TYC 8826-00247-1, 2MASS J22463675-5635584[3]
Database references
SIMBADdata
Exoplanet Archivedata

The survey in 2015 have ruled out the existence of any additional stellar companions at projected distances from 26 to 300 astronomical units.[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 planet HD 215497 b orbits very close to the star and is termed a “hot super-Earth”. The outer planet HD 215497 c is Saturn-sized and orbits a little bit further from the star as the Earth, at around 1.282 AU.[2]

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. 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. Lo Curto, G.; et al. (2010). "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. "HD 215497". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-11-08.
  4. 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). doi:10.1093/mnras/stv771. Retrieved 19 June 2020.


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