19h27m27.085s, +46° 25′ 45.89″| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus[1] |
| Right ascension | 19h27m 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 | |
Gaia DR2 2126820324123177472, KOI-947, KIC 9710326, TIC 63068329, 2MASS J19272708+4625453, WISE J192727.10+462545.1 | |
| Database references | |
| SIMBAD | data |
Kepler-737 is an M-type main-sequence red dwarf located 671 light-years away on the border of the constellation Cygnus. [6]
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, or about 3 times denser than the Sun;[5] while its surface gravity is stronger than the Sun, with log g of 4.722±0.008 cgs.[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]
The star has one known planet, Kepler-737b.
| 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 confirmed on May 18, 2016 from data collected earlier by the Kepler space telescope, notable for orbiting in the habitable zone but not likely to be habitable because it is tidally locked.[7][8][9] It may, however, 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 its 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]
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