Gliese 687

Gliese 687

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 17h 36m 25.89931s[1]
Declination +68° 20′ 20.9096″[1]
Apparent magnitude (V) 9.15[2]
Characteristics
Spectral type M3.5 V[3]
U−B color index 1.06
B−V color index 1.49
Astrometry
Radial velocity (Rv)−28.90±0.13[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]
Distance14.839 ± 0.001 ly
(4.5498 ± 0.0004 pc)
Absolute magnitude (MV)10.87
Details
Mass0.40±0.02[4] M☉
Radius0.4183±0.0070[5] R☉
Luminosity0.02128±0.00023[5] L☉
Surface gravity (log g)4.66[6] cgs
Temperature3,413±28[5] K
Metallicity [Fe/H]+0.11 ± 0.20[6] dex
Rotation61.8±1.0 d[7]
Rotational velocity (v sin i)<2.8[8] km/s
Other designations
BD+68 946, GJ 687, HIP 86162, SAO 17568, LHS 450, LTT 15232, PLX 4029.00[2]
Database references
SIMBADdata
Gliese 687 is located in the constellation Draco.
Gliese 687 is located in the constellation Draco.
Gliese 687
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.[2] It is known to have a Neptune-mass planet.[7] Old books and articles refer to it as Argelander Oeltzen 17415.[9]

  1. ^ a b c d e Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference apj649_1_436 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Feng2020 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference Boyajianvon Braun2012 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference apj644 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference 687b-discovery was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference apj704_2_975 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Oeltzen17415 was invoked but never defined (see the help page).