HD 213240
Coordinates: 
22h 31m 00.3672s, −49° 25′ 59.773″
22h 31m 00.3672s, −49° 25′ 59.773″| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Grus |
| Right ascension | 22h 31m 00.36634s[1] |
| Declination | −49° 25′ 59.7690″[1] |
| Apparent magnitude (V) | 6.81[2] |
| Characteristics | |
| Spectral type | G0/G1V[3] + M5-5.5[4] |
| B−V color index | 0.603±0.005[2] |
| Absolute magnitude (MV) | 3.77[2] |
| Details | |
Gyr | |
LTT 9047[9] | |
| Database references | |
| SIMBAD | data |
HD 213240 is a possible
This is an ordinary
A
Planetary system
The Geneva extrasolar planet search team discovered a planet orbiting this star in 2001.[11] Since this planet was discovered by radial velocity, only its minimum mass was initially known, and there was a 5% chance of it being massive enough to be a brown dwarf.[10] In 2023, the inclination and true mass of HD 213240 b were determined via astrometry, confirming its planetary nature.[12]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (years) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 5.21+1.5 −0.49 MJ |
1.92±0.026 | 2.4071+0.008 −0.0083 |
0.4201+0.01 −0.0093 |
63+17 −20 or 117+20 −17° |
— |
See also
- HD 212301
- List of extrasolar planets
References
- ^ S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ S2CID 119257644.
- ^ Bibcode:1978mcts.book.....H.
- S2CID 118516214. A120.
- ^ S2CID 119219062. 136.
- ^ .
- ^ S2CID 53971692.
- ^ S2CID 56051637, A69
- ^ "HD 213240". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-27.
- ^ S2CID 14065040.
- S2CID 59061741.
- ^ S2CID 257663647.
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