Kepler-37b
| Exoplanet | List of exoplanets | |
|---|---|---|
 |
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| Parent star | ||
| Star | Kepler-37 | |
| Constellation | Lyra | |
| Right ascension | (α) | 18h 56m 14.32s |
| Declination | (δ) | +44° 31′ 05.3″ |
| Apparent magnitude | (mV) | 9.71 |
| Distance | 215.2 ly (66 pc) |
|
| Spectral type | G8V | |
| Mass | (m) | 0.80 (± 0.07) M☉ |
| Radius | (r) | 0.77 (± 0.03) R☉ |
| Temperature | (T) | 5417 (± 75) K |
| Metallicity | [Fe/H] | −0.32 (± 0.07) |
| Age | 5.66 Gyr | |
| Physical characteristics | ||
| Mass | (m) | 0.01+5.99 −0.01M⊕ |
| Radius | (r) | 0.354 (± 0.014) R⊕ |
| Stellar flux | (F⊙) | 45.53 ⊕ |
| Temperature | (T) | 700 K (427 °C; 800 °F) |
| Orbital elements | ||
| Semi-major axis | (a) | 0.1003AU |
| Eccentricity | (e) | 0.080+0.210 −0.080 |
| Orbital period | (P) | 13.367308d |
| Inclination | (i) | 88.63° |
| Discovery information | ||
| Discovery date | February 20, 2013 | |
| Discoverer(s) | ||
| Discovery method | Transit (Kepler Mission) | |
| Discovery site | Kepler Space Observatory | |
| Discovery status | Published | |
| Other designations | ||
|
KOI-245.01, KOI-245 b, KIC-8478994 b, TYC 3131-1199-1 b
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| Database references | ||
| Extrasolar Planets Encyclopaedia |
data | |
| SIMBAD | data | |
| Exoplanet Archive | data | |
| Open Exoplanet Catalogue | data | |
Kepler-37b is an extrasolar planet (exoplanet) orbiting Kepler-37 in the constellation Lyra. As of February 2013[update] it is the smallest planet discovered around a main-sequence star, with a radius slightly greater than that of the Moon. The measurements do not constrain its mass, but masses above a few times that of the Moon give unphysically high densities.
Kepler-37b is a sub-Earth, an exoplanet with a radius and mass smaller than Earth. Its surface temperature is 700 K (427 °C; 800 °F). Because of this, it is not expected to have an atmosphere. Its radius is approximately 0.34 R⊕ (about a diameter of 3,900 kilometres (2,400 mi)), about a little larger than the Moon. Due to its small size, it is very likely Kepler-37b is a rocky planet with a solid surface. Furthermore, it is too hot to support liquid water on its surface.
The planet orbits a (G-type) star similar to the Sun, named Kepler-37, orbited by a total of four planets. The star has a mass of 0.80 M☉ and a radius of 0.79 R☉. It has a temperature of 5417 K and is 5.66 billion years old. In comparison, the Sun is 4.6 billion years old and has a temperature of 5778 K.
The star's apparent magnitude, or how bright it appears from Earth's perspective, is 9.71. Therefore, it is too dim to be seen with the naked eye.
Kepler-37b orbits its parent star at a distance of about 15 million kilometers (9.3 million miles), with a period of roughly 13 days at a distance of 0.1 AU (compared to Mercury's distance from the Sun, which is about 0.38 AU). The outer two planets in the system have orbital periods within one percent of the 8:5 and 3:1 resonances with Kepler-37b's period.
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