K2-3c

Short description: Extrasolar planet

K2-3cDiscovery[1]

Discovery site| Kepler Space Observatory
Discovery date| 2015

Detection method

| Transit
Orbital characteristics[2]

Semi-major axis

| 0.1357+0.0023
−0.0022 astronomical unit|AU
Eccentricity| 0.048+0.073
−0.035
Orbital period| 24.646729+0.000044
−0.000042 d
Inclination| 89.84°+0.11°
−0.14°

astron|astron|helion}}

| −180°+100°
−110°
Semi-amplitude| 0.88±0.28 m/s
Star| K2-3
Physical characteristics[2]
Mean radius| 1.582+0.057
−0.051 R🜨
Mass| 2.68±0.85 M🜨
Mean density| 3.7±1.2 g/cm3
Physics| 371.8+3.8
−3.9 K (98.7 °C; 209.6 °F, equilibrium)

K2-3c, also known as EPIC 201367065 c, is an exoplanet orbiting the red dwarf star K2-3 every 24 days. It is 143 light-years away.[3] It has a density of about 3.7 g/cm3, indicating that it could be an ocean world or a mini-Neptune. It is the second-smallest planet in the system by both radius and mass, with a mass almost three times that of Earth.[4]

## References

1. ↑ Crossfield, Ian J. M. et al. (2015). "A Nearby M Star with Three Transiting Super-Earths Discovered by K2". The Astrophysical Journal 804 (1): 10. doi:10.1088/0004-637X/804/1/10. Bibcode: 2015ApJ...804...10C.
2. ↑ 2.0 2.1 Diamond-Lowe, Hannah; Kreidberg, Laura; Harman, C. E.; Kempton, Eliza M.-R.; Rogers, Leslie A.; Joyce, Simon R. G.; Eastman, Jason D.; King, George W. et al. (2022), "The K2-3 System Revisited: Testing Photoevaporation and Core-powered Mass Loss with Three Small Planets Spanning the Radius Valley", The Astronomical Journal 164 (5): 172, doi:10.3847/1538-3881/ac7807, Bibcode: 2022AJ....164..172D
3. ↑ Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
4. ↑ "K2-3 PLANET HOST PAGE". NASA Exoplanet Archive. http://exoplanetarchive.ipac.caltech.edu/cgi-bin/DisplayOverview/nph-DisplayOverview?objname=K2-3&type=PLANET_HOST. Retrieved 2015-10-17.

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K2-3 system

Stars|

* K2-3

Planets|

* K2-3b
* K2-3c
* K2-3d

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* t
* e

2015 in space

* « 2014

2016 »

Launches|

| Space probes|

* LISA Pathfinder
* SMAP

|

Space observatories|

* Astrosat
* DSCOVR

Impact events|

* 2015 Kerala meteorite
* 2015 Thailand bolide
* WT1190F impact

Selected comets|

* 15P/Finlay
* C/2014 Q2 (Lovejoy)
* 88P/Howell
* 22P/Kopff
* 10P/Tempel
* C/2013 US10

Selected NEOs|

* Closest asteroid approaches in 2015
* 2015 BP513
* (357439) 2004 BL86
* 2015 AZ43
* 1566 Icarus
* 2015 TB145
* 2007 VE191
* (33342) 1998 WT24
* (85989) 1999 JD6
* 2015 SO2

Exoplanets|

* Aldebaran b
* β Circini b
* EPIC 2037 b
* EPIC 2037 c
* Gliese 1132 b
* HD 155233 b
* HD 164595 b
* HD 219134 b
* HD 219134 c
* HD 219134 d
* HD 219134 e
* HD 219134 f
* HD 219134 g
* HD 219134 h
* HIP 11915 b
* KELT-4Ab
* Kepler-438b
* Kepler-440b
* Kepler-442b
* Kepler-444
* Kepler-451b
* Kepler-452b
* Kepler-453b
* K2-3d
* K2-18b
* K2-22b
* WASP-121b
* Wolf 1061c

Discoveries|

* GW150914 (first observation of gravitational waves, announced in 2016)
* GW151226 (announced in 2016)
* 2015 TH367 (TNO)
* WISE J224607.57−052635.0 (galaxy)

Space
exploration|

* Dawn (Ceres orbit injection)
* Rosetta (orbiting comet 67P)
* MESSENGER (end of mission)
* New Horizons (flyby of Pluto)
* Akatsuki (Venus orbit injection)

* Category:2014 in space — Category:2015 in space — Category:2016 in space

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