HD 215497

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HD 215497
HD 215497 b SuperEarth.png
Artist's illustration of HD 215497 b, a hot "Super-Earth" planet.
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Tucana
Right ascension 22h 46m 36.755s[1]
Declination −56° 35′ 58.32″[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: -53.68 ± 0.89[1] mas/yr
Dec.: -60.49 ± 0.89[1] mas/yr
Parallax (π) 22.94 ± 1.09[1] mas
Distance 142 ± 7 ly
(44 ± 2 pc)
Absolute magnitude (MV) 5.77
Details
Mass 0.872 ± 0.023[2] M
Radius 1.01 ± 0.11 R
Luminosity 0.39[2] L
Surface gravity (log g) 4.31 ± 0.17[2] cgs
Temperature 5113 ± 93[2] K
Metallicity 0.23 ± 0.07[2]
Other designations
HIP 112441, TYC 8826-00247-1, CPD-57 10139, SAO 247578, PPM 350516, 2MASS J22463675-5635584
Database references
SIMBAD data
Exoplanet Archive data
Extrasolar Planets
Encyclopaedia
data

HD 215497 is a star located approximately 142 light-years away in the constellation of Tucana. It is a K3V star with the characteristics very similar to the Sun. In 2009, two extrasolar planets were discovered orbiting the star.[2]

Planetary system[edit]

Announced in 2009, two extrasolar planets were discovered to be orbiting the star. 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[edit]

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