Kepler-62d
Coordinates: 18h 52m 51.06019s, +45° 20′ 59.507″
Discovery | |
---|---|
Kepler Mission)[1] | |
Orbital characteristics | |
0.120 ± 0.001[1] AU | |
Eccentricity | ~0[1] |
18.16406 ± 0.00002[1] d | |
Inclination | 89.7 ± 0.3[1] |
Star | Kepler-62 (KOI-701) |
Physical characteristics | |
Mean radius | 1.95 ± 0.07[1] R🜨 |
Mass | 5.5+8.5 −5.5[2] ME |
Temperature | Teq: 510 K (237 °C; 458 °F) |
Kepler-62d (also known by its Kepler Object of Interest designation KOI-701.01) is the third innermost and the largest exoplanet discovered orbiting the star
transit method, in which the dimming that a planet causes as it crosses in front of its star is measured.[1] Its stellar flux is 15 ± 2 times Earth's.[1] Due to its closer orbit to its star, it is a super-Venus or, if it has a volatile composition, a hot Neptune
, with an estimated equilibrium temperature of 510 K (237 °C; 458 °F), too hot to sustain life on its surface.
Physical characteristics
Mass, radius and temperature
Kepler-62d is a
equilibrium temperature of 510 K (237 °C; 458 °F). It has a radius of 1.95 R🜨.[1] Because of its radius (and temperature), it is likely to be either a "super-Venus", or a hot mini-Neptune, with no solid surface. However, the mass is currently not known, estimates place an upper limit of 14 ME, the real mass is expected to be lower than this.[1] The true value is likely around 5.5 ME, based on its composition.[2]
Host star
The planet orbits a (
K and is 7 billion years old.[1] In comparison, the Sun is 4.6 billion years old[3] and has a temperature of 5778 K.[4] The star is somewhat metal-poor, with a metallicity ([Fe/H]) of −0.37, or 42% of the solar amount.[1] Its luminosity (L☉) is 21% that of the Sun.[1]
The star's apparent magnitude, or how bright it appears from Earth's perspective, is 13.65. Therefore, it is too dim to be seen with the naked eye.
Orbit
Kepler-62d orbits its host star with an orbital period of 18 days at a distance of about 0.12
sunlight than Earth does from the Sun.[1]
Discovery
In 2009,
transit events, in which a planet crosses in front of and dims its host star for a brief and roughly regular period of time. In this last test, Kepler observed 50000 stars in the Kepler Input Catalog, including Kepler-62; the preliminary light curves were sent to the Kepler science team for analysis, who chose obvious planetary companions from the bunch for follow-up at observatories. Observations for the potential exoplanet candidates took place between 13 May 2009 and 17 March 2012. After observing the respective transits, which for Kepler-62d occurred roughly every 18 days (its orbital period), it was eventually concluded that a planetary body was responsible for the periodic 18-day transits. The discovery, along with the planetary system of the star Kepler-69 were announced on April 18, 2013.[1]
References
- ^ S2CID 21029755.
- ^ a b NASA Kepler Discovers New Potentially Habitable Exoplanets Archived 2019-10-21 at the Wayback Machine Abel Mendez. April 18, 2013. Retrieved August 10, 2016.
- ^ Fraser Cain (16 September 2008). "How Old is the Sun?". Universe Today. Retrieved 19 February 2011.
- ^ Fraser Cain (15 September 2008). "Temperature of the Sun". Universe Today. Retrieved 19 February 2011.