Gliese 687
Template:Short description Template:Sky
File:Gliese 687.jpg Gliese 687 is the small orange star located in the center of the above image. | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Draco |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 9.15[2] |
| Characteristics | |
| Spectral type | M3.5 V[3] |
| U−B Template:Engvar | 1.06 |
| B−V Template:Engvar | 1.49 |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[1] km/s |
| Proper motion (μ) | RA: –320.675 mas/yr[1] Dec.: –1269.893 mas/yr[1] |
| Parallax (π) | 219.7898±0.0210 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | 10.87 |
| Details | |
| Mass | Script error: No such module "val".[4] Template:Solar mass |
| Radius | Script error: No such module "val".[5] Template:Solar radius |
| Luminosity | Script error: No such module "val".[5] Template:Solar luminosity |
| Surface gravity (log g) | 4.66[6] cgs |
| Temperature | Script error: No such module "val".[5] K |
| Metallicity [Fe/H] | +0.11 ± 0.20[6] dex |
| Rotation | Script error: No such module "val".[7] |
| Rotational velocity (v sin i) | <2.8[8] km/s |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[2] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
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Gliese 687, or GJ 687 (Gliese–Jahreiß 687) is a red dwarf in the constellation Draco. This is one of the closest stars to the Sun and lies at a distance of Script error: No such module "convert".. Even though it is close by, it has an apparent magnitude of about 9, so it can only be seen through a moderately sized telescope. Gliese 687 has a high proper motion, advancing 1.304 arcseconds per year across the sky. It has a net relative velocity of about 39 km/s.[2] It is known to have a Neptune-mass planet.[7] Old books and articles refer to it as Argelander Oeltzen 17415.[9]
Properties
Gliese 687 has about 40% of the Sun's mass and nearly 50% of the Sun's radius. Compared to the Sun, it has a slightly higher proportion of elements with higher atomic numbers than helium.[6] It seems to rotate every 60 days and exhibit some chromospheric activity.
It displays no excess of infrared radiation that would indicate orbiting dust.[10]
Gliese 687 is a solitary red dwarf that emits X-rays.[11]
Planetary system
In 2014, Gliese 687 was discovered to have a planet, Gliese 687 b, with a minimum mass of 18.394 Earth masses (which makes it comparable to Neptune), an orbital period of 38.14 days, a low orbital eccentricity and inside the habitable zone.[7] Another Neptune-mass planet candidate was discovered in 2020, in a further out and much colder orbit.[4]
Template:OrbitboxPlanet begin Template:OrbitboxPlanet Template:OrbitboxPlanet
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See also
- List of nearest stars and brown dwarfs
- List of exoplanets discovered in 2014 - Gliese 687 b
- List of exoplanets discovered in 2020 - Gliese 687 c
References
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