Kepler-277c

Kepler-277c
Discovery
Discovery siteKepler Space Observatory
Discovery date2014
Transit
Orbital characteristics
~0.209 AU
Eccentricitynull[1]
33.006[1] d
Inclinationnull[1]
StarKepler-277
Physical characteristics
3.36 +0.83
−0.72
[1] R🜨
Mass64.2 +18.1
−15.7
[1][2] ME
Mean density
9.33+15.33
−5.69
g cm−3
5.69+6.12
−2.93
g
Temperature745 K (472 °C; 881 °F)[3]

Kepler-277c (also known by its Kepler Objects of Interest designation KOI-1215.02) is the third most massive and second-largest rocky planet ever discovered, with a mass about 64 times that of Earth. Discovered in 2014 by the Kepler Space Telescope, Kepler-277c is a Neptune-sized exoplanet with a very high mass and density for an object of its radius, suggesting a composition made mainly of rock with some amounts of water. Along with its sister planet, Kepler-277b, the planet's mass was determined using transit-timing variations (TTVs).

  1. ^ a b c d e "Kepler-277 c CONFIRMED PLANET OVERVIEW PAGE". NASA Exoplanet Archive. Retrieved 2018-01-20.
  2. ^ Xie, Ji-Wei (7 January 2014). "Transit Timing Variation of Near-Resonance Planetary Pairs. Ii. Confirmation of 30 Planets in 15 Multiple-Planet Systems". The Astrophysical Journal Supplement Series. 210 (2): 25. arXiv:1309.2329. Bibcode:2014ApJS..210...25X. doi:10.1088/0067-0049/210/2/25. S2CID 119105092.
  3. ^ "PHL's calculators". Archived from the original on 2019-06-02. Retrieved 2018-01-21.