Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Cygnus [1] |
Right ascension | 19h 41m 55.76712s [2] |
Declination | +48° 31′ 27.9998″ [2] |
Apparent magnitude (V) | 14.769±0.206 [3] |
Characteristics | |
Evolutionary stage | main sequence star |
Spectral type | G4V[ citation needed] |
Apparent magnitude (J) | 13.550±0.023 [4] |
Apparent magnitude (H) | 13.204±0.024 [4] |
Apparent magnitude (K) | 13.138±0.035 [4] |
Variable type | Planetary transit, [3] rotationally variable [4] |
Astrometry | |
Proper motion (μ) |
RA: −5.092
mas/
yr
[2] Dec.: +5.839 mas/ yr [2] |
Parallax (π) | 0.6462 ± 0.0165 mas [2] |
Distance | 5,000 ± 100
ly (1,550 ± 40 pc) |
Details [3] | |
Mass | 0.9700+0.0490 −0.0590 M☉ |
Radius | 0.9500+0.1660 −0.0790 R☉ |
Temperature | 5710.0+96.696 −111.431 K |
Metallicity [Fe/H] | −0.0100+0.1410 −0.1880 dex |
Age | 4.37+4.19 −2.59 Gyr |
Other designations | |
KOI-5856, KIC 11037818, 2MASS J19415577+4831280
[4] | |
Database references | |
SIMBAD | data |
Kepler-1638 is a G-type main-sequence star located about 5,000 light years away in the constellation of Cygnus. [1] One known exoplanet has been found orbiting the star: Kepler-1638b. [5] [6] [7] [8]As of January 2021, Kepler-1638 is the farthest star with a known exoplanet orbiting in the habitable zone. [9]
Companion (in order from star) |
Mass |
Semimajor axis ( AU) |
Orbital period ( days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | ~4.16 M🜨 | 0.745+0.021 −0.020 |
259.33683±0.01303 | — | 89.9954+0.0021 −0.0844 ° |
1.87+0.33 −0.22 R🜨 |
Kepler-1638 b is an
exoplanet in orbit of its star, Kepler-1638, located in the constellation
Cygnus. It was confirmed in 2016 as part of a study statistically validating hundreds of Kepler planets. Based on the parameters in the discovery paper, the planet is a super-Earth, with a radius of 1.87+0.33
−0.22
R🜨, and a predicted mass of 4.16 Earths. It has an orbit of 259.337±0.013 days in its system's
habitable zone and orbits 0.745 AU from its star. It is the most distant known exoplanet that is considered potentially habitable.
[3]
[8]
[5]
[6]
[7]
However, these parameters were estimated before the first measurement of the host star's
parallax was published as part of
Gaia DR2 in 2018. The Gaia parallax suggests a distance of about 1,548
parsecs (5,050
light-years),
[2] much farther than the pre-Gaia estimate of about 764 parsecs (2,490 light-years).
[10] This revised distance results in a significantly larger estimate of the radius of the star, and thus of the planet, with a 2018 study finding a planetary radius of 3.226+0.201
−0.315
R🜨. This would make the planet an
ice giant like Neptune, and thus not potentially habitable in an Earth-like sense.
[11]
[3]
{{
cite web}}
: CS1 maint: numeric names: authors list (
link)
Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Cygnus [1] |
Right ascension | 19h 41m 55.76712s [2] |
Declination | +48° 31′ 27.9998″ [2] |
Apparent magnitude (V) | 14.769±0.206 [3] |
Characteristics | |
Evolutionary stage | main sequence star |
Spectral type | G4V[ citation needed] |
Apparent magnitude (J) | 13.550±0.023 [4] |
Apparent magnitude (H) | 13.204±0.024 [4] |
Apparent magnitude (K) | 13.138±0.035 [4] |
Variable type | Planetary transit, [3] rotationally variable [4] |
Astrometry | |
Proper motion (μ) |
RA: −5.092
mas/
yr
[2] Dec.: +5.839 mas/ yr [2] |
Parallax (π) | 0.6462 ± 0.0165 mas [2] |
Distance | 5,000 ± 100
ly (1,550 ± 40 pc) |
Details [3] | |
Mass | 0.9700+0.0490 −0.0590 M☉ |
Radius | 0.9500+0.1660 −0.0790 R☉ |
Temperature | 5710.0+96.696 −111.431 K |
Metallicity [Fe/H] | −0.0100+0.1410 −0.1880 dex |
Age | 4.37+4.19 −2.59 Gyr |
Other designations | |
KOI-5856, KIC 11037818, 2MASS J19415577+4831280
[4] | |
Database references | |
SIMBAD | data |
Kepler-1638 is a G-type main-sequence star located about 5,000 light years away in the constellation of Cygnus. [1] One known exoplanet has been found orbiting the star: Kepler-1638b. [5] [6] [7] [8]As of January 2021, Kepler-1638 is the farthest star with a known exoplanet orbiting in the habitable zone. [9]
Companion (in order from star) |
Mass |
Semimajor axis ( AU) |
Orbital period ( days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | ~4.16 M🜨 | 0.745+0.021 −0.020 |
259.33683±0.01303 | — | 89.9954+0.0021 −0.0844 ° |
1.87+0.33 −0.22 R🜨 |
Kepler-1638 b is an
exoplanet in orbit of its star, Kepler-1638, located in the constellation
Cygnus. It was confirmed in 2016 as part of a study statistically validating hundreds of Kepler planets. Based on the parameters in the discovery paper, the planet is a super-Earth, with a radius of 1.87+0.33
−0.22
R🜨, and a predicted mass of 4.16 Earths. It has an orbit of 259.337±0.013 days in its system's
habitable zone and orbits 0.745 AU from its star. It is the most distant known exoplanet that is considered potentially habitable.
[3]
[8]
[5]
[6]
[7]
However, these parameters were estimated before the first measurement of the host star's
parallax was published as part of
Gaia DR2 in 2018. The Gaia parallax suggests a distance of about 1,548
parsecs (5,050
light-years),
[2] much farther than the pre-Gaia estimate of about 764 parsecs (2,490 light-years).
[10] This revised distance results in a significantly larger estimate of the radius of the star, and thus of the planet, with a 2018 study finding a planetary radius of 3.226+0.201
−0.315
R🜨. This would make the planet an
ice giant like Neptune, and thus not potentially habitable in an Earth-like sense.
[11]
[3]
{{
cite web}}
: CS1 maint: numeric names: authors list (
link)