HD 240210
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cassiopeia |
| Right ascension | 23h 10m 29.2303s |
| Declination | +57° 01′ 46.035″ |
| Apparent magnitude (V) | 8.33 |
| Characteristics | |
| Spectral type | K3III |
| B−V color index | 1.63 |
| Variable type | none |
| Astrometry | |
| Proper motion (μ) | RA: 21.20 mas/yr Dec.: 6.00 mas/yr |
| Parallax (π) | 6.99 ± 3.01 mas |
| Distance | 466 ± 173 ly (143 ± 53 pc) |
| Absolute magnitude (MV) | 2.55 |
| Details | |
| Mass | 1.25 ± 0.25 M☉ |
| Radius | 13 R☉ |
| Luminosity | 51.6 L☉ |
| Temperature | 4290 ± 13 K |
| Metallicity | –0.18 ± 0.12 |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| Extrasolar Planets Encyclopaedia | data |
HD 240210 is a type K3 giant star in the constellation of Cassiopeia. On June 10, 2009 a planet orbiting the star was discovered by Niedzielski et al. This exoplanet is a 6.9 Jupiter mass planet. It is also known as 10 Cassiopiae in Flamsteed numbers.[1]
Charicteristics
Its estimated absolute magnitude is 2.55.Its B-V color index tells us it is "1.63", while our eyes tell us it is orange.
Planetary System
The system consists of HD 240210, HD 240210b, and an unconfirmed HD240210c.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥6.90 MJ | 1.33 | 501.75 ± 2.33 | 0.15 ± 0.02 | — | — |
| c (unconfirmed) | 3.80 MJ | 2.1 | 994 ± 97 | 0.58 ± 0.35 | — | — |
See also
References
- ↑ Levy, Daniel H. (2002). A Guide to Skywatching. San Francisco, CA 94133 USA: Fog City Press. pp. 89, 151. ISBN 1 877019 06-2.
- ↑ Niedzielski, A.; et al. (2009). "Substellar-mass Companions to the K-dwarf BD+14 4559 and the K-giants HD 240210 and BD+20 2457". The Astrophysical Journal. 707 (1): 768–777. arXiv:0906.1804
. Bibcode:2009ApJ...707..768N. doi:10.1088/0004-637X/707/1/768.
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