Kepler-444

Kepler-444
	; Adaptive optics image of the Kepler-444 system from Zhang et al.
Observation data; Epoch J2000 Equinox 2000
Constellation	Lyra
	Kepler-444 A
Right ascension	19h 19m 00.5489s
Declination	+41° 38′ 04.582″
Apparent magnitude (V)	8.86
	Kepler-444 B/C
Right ascension	19h 19m 00.3922s
Declination	+41° 38′ 04.013″
Characteristics
Spectral type	K0V
Astrometry
Kepler-444 A
Radial velocity (Rv)	−123.05±0.17 km/s
Proper motion (μ)	RA: 94.639(13) mas/yr ; Dec.: −632.269(14) mas/yr
Parallax (π)	27.3578 ± 0.0125 mas
Distance	119.22 ± 0.05 ly ; (36.55 ± 0.02 pc)
Kepler-444 B/C
Proper motion (μ)	RA: 94.508(55) mas/yr ; Dec.: −630.781(78) mas/yr
Parallax (π)	27.6079 ± 0.0545 mas
Distance	118.1 ± 0.2 ly ; (36.22 ± 0.07 pc)
Orbit
Primary	A
Companion	BC
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
Mass	0.754±0.030 M☉
Radius	0.753±0.010 R☉
Surface gravity (log g)	4.595±0.060 cgs
Temperature	5046±74.0 K
Metallicity [Fe/H]	−0.55±0.07 dex
Rotation	49.40±6.04 d
Age	11.00±0.8 Gyr
B
Mass	0.307+0.009; −0.008 M☉
Surface gravity (log g)	5.0±0.2 cgs
Temperature	3,464±200 K
C
Mass	0.296±0.008 M☉
Surface gravity (log g)	~5 cgs
Temperature	3,500 - 4,000 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
	Kepler-444BC: Gaia DR2 2101486923382009472
Database references
SIMBAD	data
	B/C

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]^[16] All of the planets are far too close to their star to harbour life forms.^[13]

^ ^a ^b ^c ^d Cite error: The named reference Zhang2023 was invoked but never defined (see the help page).
^ ^a ^b ^c ^d ^e ^f ^g ^h Cite error: The named reference Campante2015 was invoked but never defined (see the help page).
^ ^a ^b ^c ^d Cite error: The named reference Gaia DR3 for A was invoked but never defined (see the help page).
^ Cite error: The named reference ducati2002 was invoked but never defined (see the help page).
^ ^a ^b ^c ^d Cite error: The named reference Gaia DR3 for B/C was invoked but never defined (see the help page).
^ Cite error: The named reference wilson1962 was invoked but never defined (see the help page).
^ Cite error: The named reference Dupuy2016 was invoked but never defined (see the help page).
^ ^a ^b ^c Cite error: The named reference Buldgen2019 was invoked but never defined (see the help page).
^ Cite error: The named reference Mazeh2015 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference Simbad for A was invoked but never defined (see the help page).
^ Cite error: The named reference Simbad for B was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference SP-20150127 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference NASA-20150128 was invoked but never defined (see the help page).
^ Cite error: The named reference AP-20150127 was invoked but never defined (see the help page).
^ Cite error: The named reference UT-20150127 was invoked but never defined (see the help page).
^ Cite error: The named reference EX-20150127 was invoked but never defined (see the help page).

[Zhang2023-1] Cite error: The named reference Zhang2023 was invoked but never defined (see the help page).

[Campante2015-2] ^ ^a ^b ^c ^d ^e ^f ^g ^h Cite error: The named reference Campante2015 was invoked but never defined (see the help page).

[Gaia_DR3_for_A-3] Cite error: The named reference Gaia DR3 for A was invoked but never defined (see the help page).

[ducati2002-4] Cite error: The named reference ducati2002 was invoked but never defined (see the help page).

[Gaia_DR3_for_B/C-5] Cite error: The named reference Gaia DR3 for B/C was invoked but never defined (see the help page).

[wilson1962-6] Cite error: The named reference wilson1962 was invoked but never defined (see the help page).

[Dupuy2016-7] Cite error: The named reference Dupuy2016 was invoked but never defined (see the help page).

[Buldgen2019-8] Cite error: The named reference Buldgen2019 was invoked but never defined (see the help page).

[Mazeh2015-9] Cite error: The named reference Mazeh2015 was invoked but never defined (see the help page).

[Simbad_for_A-10] Cite error: The named reference Simbad for A was invoked but never defined (see the help page).

[Simbad_for_B-11] Cite error: The named reference Simbad for B was invoked but never defined (see the help page).

[SP-20150127-12] Cite error: The named reference SP-20150127 was invoked but never defined (see the help page).

[NASA-20150128-13] Cite error: The named reference NASA-20150128 was invoked but never defined (see the help page).

[AP-20150127-14] Cite error: The named reference AP-20150127 was invoked but never defined (see the help page).

[UT-20150127-15] Cite error: The named reference UT-20150127 was invoked but never defined (see the help page).

[EX-20150127-16] Cite error: The named reference EX-20150127 was invoked but never defined (see the help page).

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Observation data Epoch J2000 Equinox 2000
Adaptive optics image of the Kepler-444 system from Zhang et al.^[1]
Constellation	Lyra^[2]
Kepler-444 A
Right ascension	19^h 19^m 00.5489^s^[3]
Declination	+41° 38′ 04.582″^[3]
Apparent magnitude (V)	8.86^[4]
Kepler-444 B/C
Right ascension	19^h 19^m 00.3922^s^[5]
Declination	+41° 38′ 04.013″^[5]
Characteristics
Spectral type	K0V^[6]
Astrometry
Kepler-444 A
Radial velocity (R_v)	−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]
Distance	119.22 ± 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]
Distance	118.1 ± 0.2 ly (36.22 ± 0.07 pc)
Orbit^[1]
Primary	A
Companion	BC
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
Mass	0.754±0.030^[8] `M`_☉
Radius	0.753±0.010^[8] `R`_☉
Surface gravity (log g)	4.595±0.060^[2] cgs
Temperature	5046±74.0^[2] K
Metallicity [Fe/H]	−0.55±0.07^[2] dex
Rotation	49.40±6.04 d^[9]
Age	11.00±0.8^[8] Gyr


B
Mass	0.307+0.009 −0.008^[1] `M`_☉
Surface gravity (log g)	5.0±0.2^[2] cgs
Temperature	3,464±200^[2] K
C
Mass	0.296±0.008^[1] `M`_☉
Surface gravity (log g)	~5^[2] cgs
Temperature	3,500 - 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
SIMBAD	data
	B/C