| 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−Vcolor 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] |
| Distance | 132.4 ± 0.2 ly (40.59 ± 0.05 pc) |
| Absolute magnitude (MV) | 5.77[3] |
| Details[4] | |
| Mass | 0.86±0.02 M☉ |
| Radius | 0.87±0.02 R☉ |
| Luminosity | 0.47±0.02 L☉ |
| Surface gravity (log g) | 4.49±0.03 cgs |
| Temperature | 5,128±12 K |
| Metallicity [Fe/H] | 0.23±0.07[2] dex |
| Rotational velocity (v sin i) | 1.67[2] km/s |
| Age | 9.9±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 southernconstellation ofTucana. It has an orange hue with anapparent 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 300astronomical units.[6] Based onparallax measurements,[1] it is located at a distance of 132 light years from theSun. The star is drifting further away with aradial velocity of +49 km/s, having come as close as 45 light-years some 774,000 years ago.[3] Theabsolute magnitude of this star is 5.77.[3]
Thestellar classification of HD 215497 is K3V,[2] indicating this is aK-type main-sequence star that is generating energy throughcorehydrogen fusion. The star is about ten[4] billion years old with a lowmagnetic activity level and is spinning with aprojected rotational velocity of 1.67 km/s.[2] It is smaller than the Sun, with 86% of theSun's mass and 87% of theradius.[4] This is ametal-rich star, which means the abundance of heavier elements in theatmosphere is significantly higher than in the Sun.[2] It is radiating 47% of theluminosity of the Sun from itsphotosphere at aneffective temperature of 5,128 K.[4]
Announced in 2009, twoextrasolar planets were discovered to be orbiting the star.[2] Both planets are less massive thanJupiter. The inner exoplanetHD 215497 b orbits very close to the star and is termed a "hot super-Earth". Theouter exoplanetHD 215497 c is agiant planet that orbits a little bit further from the star than theEarth, at around1.282 AU, with a high eccentricity. A check fortransits of the inner planet did not reveal any passages.[7]
| 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 | — | — |
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