| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus[note 1] |
| Right ascension | 19h 45m 25.47457s[1] |
| Declination | +41° 05′ 33.8822″[1] |
| Apparent magnitude (V) | 14.87[2] |
| Characteristics | |
| Spectral type | sdB[3] |
| Apparent magnitude (U) | 13.80[2] |
| Apparent magnitude (B) | 14.71[2] |
| Apparent magnitude (R) | 15.43[2] |
| Apparent magnitude (I) | 15.72[2] |
| Apparent magnitude (J) | 15.36[2] |
| Apparent magnitude (H) | 15.59[2] |
| Astrometry | |
| Proper motion (μ) | RA: 7.217(29) mas/yr[1] Dec.: −3.148(30) mas/yr[1] |
| Parallax (π) | 0.9086 ± 0.0247 mas[1] |
| Distance | 3,590 ± 100 ly (1,100 ± 30 pc) |
| Details | |
| Mass | 0.496 ± 0.002[3] M☉ |
| Radius | 0.203 ± 0.007[3] R☉ |
| Luminosity (bolometric) | 22.9 ± 3.1 L☉ |
| Temperature | 27,730 ± 260[3] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
| KIC | data |
Kepler-70, also known as KIC 5807616 and KOI-55, is a star about 3,600 light-years (1,100 parsecs) away in the constellation Cygnus, with an apparent visual magnitude of 14.87.[2] This is too faint to be seen with the naked eye; viewing it requires a telescope with an aperture of 40 cm (20 in) or more.[4] A subdwarf B star, Kepler-70 passed through the red giant stage some 18.4 million years ago. In its present-day state, it is fusing helium in its core. Once it runs out of helium it will contract to form a white dwarf. It has a relatively small radius of about 0.2 times the Sun's radius; white dwarfs are generally much smaller.[5] The star may be host to a planetary system with two planets,[6] although later research[7][8] indicates that this is not in fact the case.
The star's apparent magnitude, or how bright it appears from Earth's perspective, is 14.87. Therefore, Kepler-70 is too dim to be seen with the naked eye.
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