Kepler-37d

Kepler-37d
Discovery
Discovery site	Kepler space telescope
Discovery date	2013
Detection method	Transit
Orbital characteristics
Semi-major axis	0.2109±0.0030 AU
Eccentricity	<0.10
Orbital period (sidereal)	39.7922622(65) d
Inclination	89.335°+0.043°; −0.047°
Star	Kepler-37
Physical characteristics
Mean radius	2.030+0.030; −0.039 R🜨
Mass	5.4±1.4 M🜨 or <2.0 M🜨
Mean density	4.29+0.52; −0.74 g/cm3 or <1.3 g/cm3
Temperature	499±7 K (226 °C; 439 °F, equilibrium)

Kepler-37d is an exoplanet discovered by the Kepler space telescope in February 2013.^[4] It is located 209 light years away,^[5] in the constellation Lyra.^[4] With an orbital period of 39.8 days,^[3] it is the largest of the three known planets orbiting its parent star Kepler-37.^[6]

A 2021 study detected Kepler-37d via radial velocity, finding a mass of about 5.4 M_E,^[3] but a 2023 study instead found an upper limit on its mass of only 2 M_E.^[2] In either case, it is not a rocky planet, but a low-density planet rich in volatiles.

In 2015, a grant was approved to further expand the Sagan Planet Walk by installing a Kepler-37d station on the Moon 384,500 kilometers (238,900 mi) away.^[7]^[8]

^ Cite error: The named reference Barclay2013 was invoked but never defined (see the help page).
^ ^a ^b ^c ^d ^e Cite error: The named reference Bonomo2023 was invoked but never defined (see the help page).
^ ^a ^b ^c ^d Cite error: The named reference Rajpaul2021 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference Black was invoked but never defined (see the help page).
^ Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
^ Cite error: The named reference Harwood was invoked but never defined (see the help page).
^ "Tompkins County Strategic Tourism Planning Board" (PDF). Tompkins County NY. April 15, 2015. Archived from the original (PDF) on December 27, 2016. Retrieved March 5, 2016.
^ "Kepler-37d".

[Barclay2013-1] Cite error: The named reference Barclay2013 was invoked but never defined (see the help page).

[Bonomo2023-2] Cite error: The named reference Bonomo2023 was invoked but never defined (see the help page).

[Rajpaul2021-3] Cite error: The named reference Rajpaul2021 was invoked but never defined (see the help page).

[Black-4] Cite error: The named reference Black was invoked but never defined (see the help page).

[GaiaDR3-5] Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).

[Harwood-6] Cite error: The named reference Harwood was invoked but never defined (see the help page).

[:0-7] "Tompkins County Strategic Tourism Planning Board" (PDF). Tompkins County NY. April 15, 2015. Archived from the original (PDF) on December 27, 2016. Retrieved March 5, 2016.

[8] "Kepler-37d".

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Kepler-37d

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