Gliese 687
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Draco |
| Right ascension | 17h 36m 25.89931s |
| Declination | +68° 20′ 20.9096″ |
| Apparent magnitude (V) | 9.15 |
| Characteristics | |
| Spectral type | M3.5 V |
| U−B color index | 1.06 |
| B−V color index | 1.49 |
| Astrometry | |
| Radial velocity (Rv) | −28.90±0.13 km/s |
| Proper motion (μ) | RA: –320.675 mas/yr Dec.: –1269.893 mas/yr |
| Parallax (π) | 219.7898±0.0210 mas |
| Distance | 14.839 ± 0.001 ly (4.5498 ± 0.0004 pc) |
| Absolute magnitude (MV) | 10.87 |
| Details | |
| Mass | 0.40±0.02 M☉ |
| Radius | 0.4183±0.0070 R☉ |
| Luminosity | 0.02128±0.00023 L☉ |
| Surface gravity (log g) | 4.66 cgs |
| Temperature | 3,413±28 K |
| Metallicity [Fe/H] | +0.11 ± 0.20 dex |
| Rotation | 61.8±1.0 d |
| Rotational velocity (v sin i) | <2.8 km/s |
| Other designations | |
| BD+68 946, GJ 687, HIP 86162, SAO 17568, LHS 450, LTT 15232, PLX 4029.00 | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
Location of Gliese 687 in the constellation Draco | |
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 14.84 light-years (4.55 parsecs). 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. It is known to have a Neptune-mass planet. Old books and articles refer to it as Argelander Oeltzen 17415.