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'''K2-3''', also known as '''EPIC 201367065''',<ref name="nasa" /> is a ] with three known planets. All are ], and the outermost is in the ].<ref></ref> It is on the borderline of being a late ]/] star, but because of its temperature, it is classified as a ] (4,000 K is typically the division line between spectral class M and K). '''K2-3''', also known as '''EPIC 201367065''',<ref name="nasa" /> is a ] with three known planets. All are ], and the outermost is in the ].<ref></ref> It is on the borderline of being a late ]/] star, but because of its temperature (3835 K), it is M0V rather than K9V. (4,000 K is typically the division line between spectral class M and K). It is in the constellation Leo.


At a distance of about 144 light-years,<ref name="Gaia DR2"/> the star ranks among the top 10 nearest stars known to have transiting planets. The star's proximity means it is bright enough to make it feasible for astronomers to study the planets' atmospheres to determine whether they are like Earth's atmosphere and possibly conducive to life. At a distance of about 144 light-years,<ref name="Gaia DR2"/> the star ranks among the top 10 nearest stars known to have transiting planets. The star's proximity means it is bright enough to make it feasible for astronomers to study the planets' atmospheres to determine whether they are like Earth's atmosphere and possibly conducive to life.
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==Planetary system== ==Planetary system==
K2-3 has at least three confirmed ]s:<ref name="Crossfield2015"/> K2-3 has at least three confirmed ]s:<ref name="Crossfield2015"/>


{{OrbitboxPlanet begin {{OrbitboxPlanet begin

Revision as of 22:39, 15 November 2020

K2-3
Observation data
Epoch J2000      Equinox J2000
Constellation Leo
Right ascension 11 29 20.3918
Declination −01° 27′ 17.280″
Apparent magnitude (V) 12.168±0.009
Characteristics
Spectral type M0V
B−V color index 1.35 ± 0.06
Astrometry
Radial velocity (Rv)32.6±1 km/s
Proper motion (μ) RA: 94.034±0.094 mas/yr
Dec.: −78.139±0.057 mas/yr
Parallax (π)22.6610 ± 0.0553 mas
Distance143.9 ± 0.4 ly
(44.1 ± 0.1 pc)
Details
Mass0.601 ± 0.089 M☉
Radius0.561 ± 0.068 R☉
Temperature3835±70 K
Metallicity −0.01±0.09 dex
Rotation40±2 d
Age≥1 Gyr
Other designations
EPIC 201367065, 2MASS J11292037-0127173, WISE J112920.45-012718.0
Database references
SIMBADdata

K2-3, also known as EPIC 201367065, is a red dwarf with three known planets. All are Super-Earths, and the outermost is in the hab zone. It is on the borderline of being a late orange dwarf/K-type star, but because of its temperature (3835 K), it is M0V rather than K9V. (4,000 K is typically the division line between spectral class M and K). It is in the constellation Leo.

At a distance of about 144 light-years, the star ranks among the top 10 nearest stars known to have transiting planets. The star's proximity means it is bright enough to make it feasible for astronomers to study the planets' atmospheres to determine whether they are like Earth's atmosphere and possibly conducive to life.

Planetary system

K2-3 has at least three confirmed exoplanets:

The K2-3 planetary system
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b 6.6±1.1 M🜨 0.0777+0.0024
−0.0026 		10.05454±0.00003 0.06 ± 0.06 89.59+0.24
−0.40° 		2.29±0.23 R🜨
c 3.1+1.3
−1.2 M🜨 		0.1413+0.0044
−0.0047 		24.64638±0.00017 0.04 ± 0.04 89.70 ± 0.20° 1.77±0.18 R🜨
d 2.7+1.2
−0.8 M🜨 		0.2097+0.0065
−0.0070 		44.55764±0.00042 0.045 ± 0.045 89.79 ± 0.15° 1.65±0.17 R🜨

References

  1. Roman, Nancy G. (1987). "Identification of a Constellation From a Position". Publications of the Astronomical Society of the Pacific. 99 (617): 695–699. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Vizier query form
  2. ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  3. Henden, A. A.; et al. (2016). "VizieR Online Data Catalog: AAVSO Photometric All Sky Survey (APASS) DR9 (Henden+, 2016)". VizieR On-line Data Catalog: II/336. Originally Published in: 2015AAS...22533616H. 2336. Bibcode:2016yCat.2336....0H.Vizier catalog entry
  4. ^ "K2-3 PLANET HOST OVERVIEW PAGE". NASA Exoplanet Archive. Retrieved 2015-10-17.
  5. ^ 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. arXiv:1501.03798. Bibcode:2015ApJ...804...10C. doi:10.1088/0004-637X/804/1/10.
  6. ^ Damasso, M.; 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. arXiv:1802.08320. Bibcode:2018A&A...615A..69D. doi:10.1051/0004-6361/201732459. S2CID 58923147.
  7. Kosiarek, Molly R.; et al. (2019). "Bright Opportunities for Atmospheric Characterization of Small Planets: Masses and Radii of K2-3 b, c, and d and GJ3470 b from Radial Velocity Measurements and Spitzer Transits". The Astronomical Journal. 157 (3). 97. arXiv:1812.08241. Bibcode:2019AJ....157...97K. doi:10.3847/1538-3881/aaf79c.
  8. Three Super-Earths Found Circling Nearby Red Dwarf
K2-3 system
Stars
Planets
2015 in space
Space probe launches Space probes launched in 2015
Space probes
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  • DSCOVR (weather satellite; Feb 2015)
  • Astrosat (space telescope; Sep 2015)


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Exoplanets Exoplanets discovered in 2015
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Constellation of Leo
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