HD 240237
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cassiopeia |
| Right ascension | 23h 15m 42.22361s[1] |
| Declination | +58° 02′ 35.6654″[1] |
| Apparent magnitude (V) | 8.19 |
| Characteristics | |
| Spectral type | K2III[2] |
| Details | |
| Mass | 1.69 ± 0.42[2] M☉ |
| Radius | 32 ± 1[2] R☉ |
| Luminosity | 331[3] L☉ |
| Temperature | 4361 ± 10[2] K |
| Metallicity [Fe/H] | -0.26 ± 0.07[2] dex |
| Rotation | ≥1010 d[2] |
| Age | ~0.27 Gyr |
HD 240237 is a red giant approximately 4,900 light-years away in the constellation Cassiopeia.[1] The star has an exoplanet orbiting around it every 745 days.
Nomenclature and history
The designation b, derives from the order of discovery. The designation of b is given to the first planet orbiting a given star, followed by the other lowercase letters of the alphabet.[4] In the case of HD 240237, there was only one planet, so only the letter b is used.
Planetary system
The star is known to host one planet, with a mass around 5 times that of Jupiter, roughly every 2 years with mild eccentricity.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 5.3 MJ | 1.9 | 745.7 ± 13.8 | 0.4 ± 0.1 | — | — |
References
- 1 2 3 "HD 240237". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 7 June 2014.
- 1 2 3 4 5 6 7 Gettel, S.; Wolszczan, A.; Niedzielski, A.; Nowak, G.; Adamów, M.; Zieliński, P.; Maciejewski, G. (2011). "Substellar-Mass Companions to the K-Giants HD 240237, BD +48 738 and HD 96127". The Astrophysical Journal. 745: 28. arXiv:1110.1641
. doi:10.1088/0004-637X/745/1/28. - ↑ http://www.hpcf.upr.edu/~abel/phl/hec_plots/hec_orbit/hec_orbit_HD_240237_b.png
- ↑ Hessman, F. V.; Dhillon, V. S.; Winget, D. E.; Schreiber, M. R.; Horne, K.; Marsh, T. R.; Guenther, E.; Schwope, A.; Heber, U. (2010). "On the naming convention used for multiple star systems and extrasolar planets". arXiv:1012.0707 [astro-ph.SR].
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