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 mas[1] |
| Distance | 132.4 ± 0.2 ly (40.59 ± 0.05 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 | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
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.
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]
| 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
- ^ a b c d e 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.
- ^ a b c d e f g h i j 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.
- ^ "HD 215497". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-11-08.
- ^ 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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