Kepler-737 is an M-type main-sequence red dwarf located 671 light-years away on the border of the constellation Cygnus. It was discovered by HARPS using the transit method and announced on May 10, 2016.[6]
![]() A transiting planet orbiting a star Kepler-737 | |
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Cygnus[1] |
Right ascension | 19h 27m 27.085s[2] |
Declination | +46° 25′ 45.29″[2] |
Characteristics | |
Evolutionary stage | main-sequence[3] |
Spectral type | M0V[3] |
Apparent magnitude (G) | 15.127694[4] |
Apparent magnitude (J) | 12.910[4] |
Apparent magnitude (H) | 12.293[4] |
Apparent magnitude (K) | 12.097[4] |
Apparent magnitude (B) | 17.861[5] |
Apparent magnitude (V) | 15.971[5] |
Apparent magnitude (W) | 11.969[5] |
Astrometry | |
Proper motion (μ) | RA: 20.094[2] mas/yr Dec.: −19.889[2] mas/yr |
Parallax (π) | 4.8590 ± 0.0194 mas[2] |
Distance | 671 ± 3 ly (205.8 ± 0.8 pc) |
Details | |
Mass | 0.510+0.0026 −0.0027[1] M☉ |
Radius | 0.480+0.0026 −0.0024[1] R☉ |
Luminosity | ~0.045[5] L☉ |
Surface gravity (log g) | 4.722±0.008[5] cgs |
Temperature | 3,813+40.127 −38.492[3] K |
Metallicity [Fe/H] | −0.24+0.087 −0.081[5] dex |
Age | 3.89[5] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Kepler-737 is around half the size of the Sun, with a mass of 0.51 solar masses and a radius of 0.48 solar radii.[1] Its spectral class is M0V, its temperature is about 3,813 Kelvin, and it has a brightness of 0.045 solar luminosity.[5] One Kepler Object of Interest (KOI) table claimed the star to be ~14 billion years old.[5]
As for the logarithm of the relative abundance of iron and hydrogen, its metallicity [Fe/H] is −0.24+0.087
−0.081 dex, significantly lower than the Sun's. Its density is roughly 5.239±0.265 g/cm3.[5] Its gravity is weaker than the Sun, with log g of 4.722±0.008 cgs. Its stellar density is about ~5.239±0.265 g/cm3, while the sun is about 1.41 g/cm³.[5]
SIMBAD data indicate that its proper motion is 20.094 mas/yr for right ascension, −19.889 mas/yr for declination, its parallax is 4.859 mas.[4]
Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius[6] |
---|---|---|---|---|---|---|
b | ~4.5 M🜨 | 0.035 | 28.592 | 0 | 89.99° | 1.96±0.11 R🜨 |
Kepler-737b[6] was discovered and suspected since May 18, 2016, for orbiting in the habitable zone but not likely to be inhabitable because Kepler-737b is tidally locked.[7] [8][9] Kepler-737b may instead have atmospheric circulation that would distribute the heat around the planet, potentially making a large portion of it habitable, although given its stellar flux the most likely scenario is that the planet's surface is too hot to be habitable. Water on Kepler-737b's surface could also distribute heat.
On the note of the Exoplanet Archive, Kepler-737b was dedicated that orbital period, transit mid-point, transit duration, Rp/Rs, and their errors are taken from DR24 KOI table[5]
Constellation of Cygnus | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Stars | |||||||||||
Star clusters |
| ||||||||||
Molecular clouds | |||||||||||
Nebulae |
| ||||||||||
Galaxies |
|
2016 in space | ||
---|---|---|
| ||
Space probe launches ![]() |
| |
Impact events | ||
Selected NEOs |
| |
Exoplanets ![]() |
| |
Discoveries |
| |
Novae | ||
Comets ![]() |
| |
Space exploration |
| |
|