K2-32
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ophiuchus[1] |
| Right ascension | 16h 49m 42.2602s[2] |
| Declination | −19° 32′ 34.151″[2] |
| Apparent magnitude (V) | 12.31±0.02[3] |
| Characteristics | |
| Spectral type | G9V[4] |
| Apparent magnitude (J) | 10.404±0.024[5] |
| Apparent magnitude (H) | 9.993±0.025[5] |
| Apparent magnitude (K) | 9.821±0.019[5] |
| Variable type | Planetary transit variable[6] |
| Details Gyr | |
| Other designations | |
| Database references | |
| SIMBAD | data |
K2-32 is a
transiting exoplanets are known to orbit this star.[9] A study of atmospheric escape from the planet K2-32b caused by high-energy stellar irradiation indicates that the star has always been a very slow rotator.[10]
Planetary system
Discovery
The star K2-32 was initially found to have three transiting planet candidates by Andrew Vanderburg and collaborators in 2016.false positives.[6]
The Earth-sized planet K2-32e was discovered and validated by René Heller and team in 2019.[9][11]
Characteristics
With periods of 4.34, 8.99, 20.66 and 31.71 days the four planets
habitable zone located at 0.58 astronomical units.[12]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| K2-32e | 2.1+1.3 −1.1 M🜨 |
0.04899+0.00041 −0.00038 |
4.34934±0.00039 | 0.043+0.048 −0.030 |
89.0±0.7° | 1.212+0.052 −0.046 R🜨 |
| K2-32b | 15.0+1.8 −1.7 M🜨 |
0.07950+0.00066 −0.00062 |
8.992±0.00008 | 0.03+0.032 −0.02 |
89.0+0.5 −0.3° |
5.299±0.191 R🜨 |
| K2-32c | 8.1±2.4 M🜨 | 0.13843+0.00115 −0.00108 |
20.66093+0.00080 −0.00079 |
0.049+0.046 −0.035 |
89.4+0.3 −0.2° |
2.134+0.123 −0.102 R🜨 |
| K2-32d | 6.7±2.5 M🜨 | 0.18422+0.00152 −0.00144 |
31.71701+0.00101 −0.00096 |
0.05+0.053 −0.035 |
89.4±0.1° | 3.484+0.112 −0.129 R🜨 |
References
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- ^ .
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- ^ .
- ^ "K2-32". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-09-01.
- ^ .
- .
- ^ "Astronomers Discover 18 New Small Exoplanets in Kepler Data" (Press release). Sci-News.com. 2019-05-28. Retrieved 2019-09-27.
- .
- .
External links
- The Extrasolar Planets Encyclopaedia entry for K2-32b
- The Extrasolar Planets Encyclopaedia entry for K2-32c
- The Extrasolar Planets Encyclopaedia entry for K2-32d
- The Extrasolar Planets Encyclopaedia entry for K2-32e
