Kepler-90g

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Kepler-90g
Discovery
Transit
Designations
KOI-351 g, KOI-351.02
Orbital characteristics
0.71±0.08 AU[1]
Eccentricity0.049+0.011
−0.007[2]
210.48+0.05
−0.05 d[2]
Inclination89.92°+0.03°
−0.01°[2]
90°+20°
−20°[2]
StarKepler-90
Physical characteristics
Mean radius
8.1±0.8 R🜨[1]
Mass15.0+0.9
−0.8 M🜨[2]
Mean density
0.15±0.05 g/cm3[2]
Temperature349 K (76 °C)

Kepler-90g (also known by its

transit method, in which the dimming effect that a planet causes as it crosses in front of its star is measured. It orbits its parent star about every 210.5 days at a distance of 0.71 astronomical units.[1]

Kepler-90g's orbital period changes by 25.7 hours between two consecutive transits, caused by gravitational perturbations from other planets in the system. Additionally, changes in the depth and duration of transit events led to an exomoon being hypothesized to orbit this planet.[1] However, this candidate moon was later found to be a false positive.[4]

A 2020 analysis of transit-timing variations of Kepler-90g and

puffy planet with a dusty atmosphere or a smaller planet surrounded by a tilted wide ring system (albeit the latter option is less likely due to the lack of evidence for rings in transit data).[2]

Artist's impression of the planets of the Kepler-90 exoplanetary system compared to the eight planets of the Solar System.

Host star

Main article: Kepler-90

The planet orbits a G-type star named Kepler-90, its host star. The star is 1.2 times as massive as the Sun and is 1.2 times as large as the Sun. It is estimated to be 2 billion years old, with a surface temperature of 6080 K. In comparison, the Sun is about 4.6 billion years old[5] and has a surface temperature of 5778 K.[6]

See also

References

  1. ^
    S2CID 118875825
    .
  2. ^
    S2CID 226975548
    .
  3. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR
    .
  4. S2CID 119118726
    .
  5. ^ Fraser Cain (16 September 2008). "How Old is the Sun?". Universe Today. Retrieved 19 February 2011.
  6. ^ Fraser Cain (15 September 2008). "Temperature of the Sun". Universe Today. Retrieved 19 February 2011.
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