Kepler-444

Kepler-444

Adaptive optics image of the Kepler-444 system from Zhang et al.[1]
Observation data
Epoch J2000      Equinox 2000
Constellation Lyra[2]
Kepler-444 A
Right ascension 19h 19m 00.5489s[3]
Declination +41° 38′ 04.582″[3]
Apparent magnitude (V) 8.86[4]
Kepler-444 B/C
Right ascension 19h 19m 00.3922s[5]
Declination +41° 38′ 04.013″[5]
Characteristics
Spectral type K0V[6]
Astrometry
Kepler-444 A
Radial velocity (Rv)−123.05±0.17[7] km/s
Proper motion (μ) RA: 94.639(13) mas/yr[3]
Dec.: −632.269(14) mas/yr[3]
Parallax (π)27.3578 ± 0.0125 mas[3]
Distance119.22 ± 0.05 ly
(36.55 ± 0.02 pc)
Kepler-444 B/C
Proper motion (μ) RA: 94.508(55) mas/yr[5]
Dec.: −630.781(78) mas/yr[5]
Parallax (π)27.6079 ± 0.0545 mas[5]
Distance118.1 ± 0.2 ly
(36.22 ± 0.07 pc)
Orbit[1]
PrimaryA
CompanionBC
Period (P)324+31
−25 yr
Semi-major axis (a)52.2+3.3
−2.7 AU
Eccentricity (e)0.55+0.05
−0.05
Inclination (i)85.4+0.3
−0.4°
Longitude of the node (Ω)250.7+0.2
−0.2°
Periastron epoch (T)JD 2537060+10881
−8533
Argument of periastron (ω)
(secondary)		227.3+6.5
−5.2°
Details
A
Mass0.754±0.030[8] M☉
Radius0.753±0.010[8] R☉
Surface gravity (log g)4.595±0.060[2] cgs
Temperature5046±74.0[2] K
Metallicity [Fe/H]−0.55±0.07[2] dex
Rotation49.40±6.04 d[9]
Age11.00±0.8[8] Gyr
B
Mass0.307+0.009
−0.008[1] M☉
Surface gravity (log g)5.0±0.2[2] cgs
Temperature3,464±200[2] K
C
Mass0.296±0.008[1] M☉
Surface gravity (log g)~5[2] cgs
Temperature3,500 - 4,000[2] K
Other designations
BD+41°3306, WDS J19190+4138, KOI-3158, KIC 6278762, 2MASS J19190052+4138043
Kepler-444A: Gaia DR2 2101486923385239808, HIP 94931, LHS 3450, TYC 3129-00329-1, 2MASS J19190052+4138043[10]
Kepler-444BC: Gaia DR2 2101486923382009472[11]
Database references
SIMBADdata
B/C
Exoplanet Archivedata

Kepler-444 (or KOI-3158, KIC 6278762, 2MASS J19190052+4138043, BD+41°3306)[10] is a triple star system, estimated to be 11.2 billion years old (more than 80% of the age of the universe),[12] approximately 119 light-years (36 pc) away from Earth in the constellation Lyra. On 27 January 2015, the Kepler spacecraft is reported to have confirmed the detection of five sub-Earth-sized rocky exoplanets orbiting the main star. The star is a K-type main sequence star.[13][14][15][12] All of the planets are far too close to their star to harbour life forms.[13]

  1. ^ a b c d Cite error: The named reference Zhang2023 was invoked but never defined (see the help page).
  2. ^ a b c d e f g h Cite error: The named reference Campante2015 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference Gaia DR3 for A was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference ducati2002 was invoked but never defined (see the help page).
  5. ^ a b c d Cite error: The named reference Gaia DR3 for B/C was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference wilson1962 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Dupuy2016 was invoked but never defined (see the help page).
  8. ^ a b c Cite error: The named reference Buldgen2019 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Mazeh2015 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Simbad for A was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Simbad for B was invoked but never defined (see the help page).
  12. ^ a b Cite error: The named reference SP-20150127 was invoked but never defined (see the help page).
  13. ^ a b Cite error: The named reference NASA-20150128 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference AP-20150127 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference UT-20150127 was invoked but never defined (see the help page).