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M-type star in the constellation Cygnus From Wikipedia, the free encyclopedia
Kepler-45, formerly known as KOI-254, is a star in the northern constellation of Cygnus. It is located at the celestial coordinates: right ascension 19h 31m 29.495s, declination +41° 03′ 51.37″.[6] With an apparent visual magnitude of 16.88,[4] this star is too faint to be seen with the naked eye.
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Cygnus[1] |
Right ascension | 19h 31m 29.4966s[2] |
Declination | +41° 03′ 51.356″[2] |
Apparent magnitude (V) | 16.88[3] |
Characteristics | |
Spectral type | M1 V[4] |
Astrometry | |
Proper motion (μ) | RA: 4.646(36) mas/yr[2] Dec.: −21.589(36) mas/yr[2] |
Parallax (π) | 2.5984 ± 0.0331 mas[2] |
Distance | 1,260 ± 20 ly (385 ± 5 pc) |
Details | |
Mass | 0.59 ± 0.06[5] M☉ |
Radius | 0.55 ± 0.11[5] R☉ |
Temperature | 3820 ± 90[5] K |
Metallicity [Fe/H] | 0.13 ± 0.13[5] dex |
Other designations | |
Database references | |
SIMBAD | data |
KIC | data |
The star is exhibiting strong starspot activity, with 4.1±2.5% of its surface covered by starspots.[7]
Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | 0.5505 MJ | 0.030 | 2.455239 | — | — | 11 R🜨 |
The "Hot Jupiter" class planet Kepler-45b,[9] discovered in February 2011,[10] is unusually massive for the M-class parent star.[11] Its orbit is aligned within 11 degrees of rotational axis of the star.[12]
The planet is strongly suspected to have optically thick rings, because its planetary shadow appears to be elongated.[13]
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