K2-3

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K2-3
Observation data
Epoch J2000      Equinox J2000
Constellation Leo[1]
Right ascension 11h 29m 20.39171s[2]
Declination −01° 27′ 17.2817″[2]
Apparent magnitude (V) 12.168±0.009[3]
Characteristics
Evolutionary stage Main sequence[4]
Spectral type M0±0.5[4]
Apparent magnitude (J) 9.421±0.027[5]
Apparent magnitude (H) 8.805±0.044[5]
Apparent magnitude (K) 8.561±0.021[5]
Variable type Planetary transit[4]
Astrometry
Radial velocity (Rv)30.24±0.46[2] km/s
Proper motion (μ) RA: 94.116 mas/yr[2]
Dec.: −78.003 mas/yr[2]
Parallax (π)22.7374±0.0220 mas[2]
Distance143.4 ± 0.1 ly
(43.98 ± 0.04 pc)
Details[6]
Mass0.549+0.029
−0.027 M☉
Radius0.546+0.018
−0.016 R☉
Luminosity (bolometric)0.0587+0.0018
−0.0019 L☉
Surface gravity (log g)4.704+0.023
−0.026 cgs
Temperature3844+61
−63 K
Metallicity [Fe/H]−0.157+0.075
−0.080 dex
Rotation40±2 d[7]
Age6.9±4.7 Gyr
Other designations
Gaia DR3 3796690380302214272, EPIC 201367065, 2MASS J11292037-0127173, WISE J112920.45-012718.0[8]
Database references
SIMBADdata

K2-3, also known as EPIC 201367065,[8] is a red dwarf star with three known planets. It is on the borderline of being a late orange dwarf/K-type star, but because of its temperature, it is classified as a red dwarf (4,000 K is typically the division line between spectral class M and K).

At a distance of 143 light-years (44 parsecs),[2] 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

[edit | edit source]

K2-3 has three confirmed exoplanets, discovered in 2015.[4] All are low-density super-Earths or sub-Neptunes, with the outermost orbiting near the inner edge of the habitable zone.[9][6]

The K2-3 planetary system[6][10]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b 5.11+0.65
−0.64 M🜨 		0.0778±0.0026 10.054626(0) <0.094 89.588+0.12
−0.100° 		2.078+0.076
−0.067 R🜨
c 2.68±0.85 M🜨 0.1414±0.0047 24.646582(39) <0.095 89.905+0.066
−0.088° 		1.582+0.057
−0.051 R🜨
d <1.6 M🜨 0.2097±0.0070 44.556456(97) <0.097 89.788+0.033
−0.029° 		1.458+0.056
−0.051 R🜨

References

[edit | edit source]
  1. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). Constellation record for this object at VizieR.
  2. ^ a b c d e f Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). Gaia DR3 record for this source at VizieR.
  3. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).Vizier catalog entry
  4. ^ a b c d Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  5. ^ a b c Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). Vizier catalog entry
  6. ^ a b c Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  7. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  8. ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  9. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  10. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
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