K2-3c

Short description: Extrasolar planet

K2-3cDiscovery[1]

Discovery site| Kepler Space Observatory
Discovery date| 2015

Detection method

| Transit
Orbital characteristics

Semi-major axis

| 0.1413+0.0044
−0.0047 AU
Eccentricity| 0.04±0.04[2]
Orbital period| 24.64638±0.00017[3] d
Inclination| 89.70±0.20[2]
Semi-amplitude| 0.95±0.37[3]
Star| K2-3
Physical characteristics
Mean radius| 1.77±0.18[3] R⊕
Mass| 3.1+1.3
−1.2[3] M⊕
Mean density| 3.1+1.9
−1.3 g cm−3
Physics| 374 K (101 °C; 214 °F)

K2-3c also known as EPIC 201367065 c is an exoplanet orbiting K2-3, a red dwarf every 24 days. It is 144 ly away.[4] It has a density of 1.82g/cm3, indicating that it could be a Gas dwarf or a mini-Neptune. It is one of the smallest gas planets ever discovered. Despite not being the smallest planet in the system by radius,[5] by mass it is by far the least massive, with a mass only double that of Earth.[5]

## 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 "K2-3 c CONFIRMED PLANET OVERVIEW PAGE". NASA Exoplanet Archive. http://exoplanetarchive.ipac.caltech.edu/cgi-bin/DisplayOverview/nph-DisplayOverview?objname=K2-3+c&type=CONFIRMED_PLANET. Retrieved 2015-10-17.
3. ↑ 3.0 3.1 3.2 3.3 Damasso, Mario et al. (2018). "Eyes on K2-3: A system of three likely sub-Neptunes characterized with HARPS-N and HARPS". Astronomy and Astrophysics 615: A69. doi:10.1051/0004-6361/201732459. Bibcode: 2018A&A...615A..69D.
4. ↑ Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
5. ↑ 5.0 5.1 "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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