The Star| Name | GJ 436 | | Distance | 10.2 pc | | Spectral Type | M2.5 | | Apparent Magnitude V | 10.68 | | Mass | 0.452 (−0.012+0.014) Msun | | Age | 6 (−5+4) Gyr | | Effective Temperature | 3684 (−55+87) K | | Radius | 0.464 (−0.011+0.009) Rsun | | Metallicity [Fe/H] | -0.32 (± 0.12) | | Right Asc. Coord. | 11 42 11 | | Decl. Coord. | +26 42 23 |
Its PlanetsA possible terrestrial-type planet orbiting a star in the constellation of Leo. The new planet, which lies at a distance of 30 light years from the Earth, has a mass five times that of our planet but is the smallest found to date. One full day on the new planet would be equivalent to three weeks on Earth.
Dubbed GJ 436c, orbits its host star (GJ 436) in only 5.2 Earth days, and is thought to complete a revolution in 4.2 Earth days, compared to the Earth’s revolution of 24 hours and full orbit of 365 days. On Earth, a full day (sunset to sunset) coincides quite closely with the rotation period. On the new planet these two periods do not coincide, since the orbital translation period and the rotation period are very similar. For this reason, a full day on the new planet would take four planetary years, or roughly 22 Earth days. Right ascension 11h 42m 11.0941s[1]
Declination +26° 42′ 23.652″[1]
Apparent magnitude (V) 10.67[2]
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