HD 215497
| 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 | |
| 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
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]
| 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 2 3 4 5 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. Bibcode:2007A&A...474..653V. arXiv:0708.1752
. doi:10.1051/0004-6361:20078357. Vizier catalog entry - 1 2 3 4 5 6 7 8 9 10 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. Bibcode:2010A&A...512A..48L. doi:10.1051/0004-6361/200913523.
Coordinates: 
22h 46m 36.7543s, −56° 35′ 58.322″
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