 Size comparison of Kepler-11f (gray) with Neptune and Earth. | |
| Discovery | |
|---|---|
| Discovery date | 2 February 2011[1] |
| Transit (Kepler Mission)[1] | |
| Orbital characteristics | |
| 0.25 AU (37,000,000 km) | |
| 46.68876[2] d | |
| Inclination | 89.4[2] |
| Star | Kepler-11 (KOI-157) |
| Physical characteristics | |
| 2.61 ± 0.25[3] R🜨 | |
| Mass | 2.3 +2.2 −1.2[3] ME |
Mean density | 0.7 +0.7 −0.4[3] g cm−3 |
| Temperature | 544 K (271 °C; 520 °F)[2] |
Kepler-11f is an exoplanet (extrasolar planet) discovered in the orbit of the Sun-like star Kepler-11 by NASA's Kepler space telescope, which searches for planets that transit (cross in front of) their host stars. Kepler-11f is the fifth planet from its star, orbiting one quarter of the distance (.25 AU) of the Earth from the Sun every 47 days. It is the furthest of the first five planets in the system. Kepler-11f is the least massive of Kepler-11's six planets, at nearly twice the mass of Earth; it is about 2.6 times the radius of Earth. Along with planets d and e and unlike the two inner planets in the system, Kepler-11f has a density lower than that of water and comparable to that of Saturn. This suggests that Kepler-11f has a significant hydrogen–helium atmosphere.[1] The Kepler-11 planets constitute the first system discovered with more than three transiting planets.[1] Kepler-11f was announced to the public on February 2, 2011, after follow-up investigations at several observatories.[4] Analysis of the planets and study results were published the next day in the journal Nature.[1]
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