K2-28
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquarius[1] |
| Right ascension | 22h 22m 29.8611s[2] |
| Declination | −07° 57′ 19.853″[2] |
| Apparent magnitude (V) | 16.06[3] |
| Characteristics | |
| Spectral type | M4V[4][5] |
| Apparent magnitude (J) | 11.695±0.030[6] |
| Apparent magnitude (H) | 11.028±0.023[6] |
| Apparent magnitude (K) | 10.746±0.023[6] |
| Variable type | Planetary transit variable[4] |
| Details dex | |
| Database references | |
| SIMBAD | data |
K2-28 is a
transiting exoplanet is known to orbit this star. There is another star 5.2 arcseconds to the north–east of K2-28 however this star has a different proper motion and is therefore physically unrelated and probably a background star.[4]
Planetary system
Discovery
K2-28b was first noticed as a candidate extrasolar planet by Vanderburg et al. in 2016, who, in a search of 59,174 stars from the Kepler space telescope's first year of K2 observations, found 234 planetary candidates.[8] Shortly thereafter the K2-ESPRINT Project confirmed that the candidate was a super-Earth sized planet in a close orbit around a red dwarf star.[4]
Characteristics
K2-28b is a sub-Neptune sized planet orbiting its star in only 2.26 days. Despite its short orbital period the
Gliese 1214 b.[3]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| K2-28b | 7.18+5.92 −3.08 (estimate) M🜨 |
0.0191+0.0037 −0.0029 |
2.2604455±0.0000010 | 0 | 87.1+0.90 −0.74° |
2.56+0.27 −0.26 R🜨 |
References
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- ^ "K2-28". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-08-12.
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- ^ .
External links
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