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
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
	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]

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^ ^a ^b ^c Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
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^ ^a ^b Cite error: The named reference apj644 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference 687b-discovery was invoked but never defined (see the help page).
^ Cite error: The named reference apj704_2_975 was invoked but never defined (see the help page).
^ Cite error: The named reference Oeltzen17415 was invoked but never defined (see the help page).

[GaiaDR3-1] Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).

[SIMBAD-2] Cite error: The named reference SIMBAD was invoked but never defined (see the help page).

[apj649_1_436-3] Cite error: The named reference apj649_1_436 was invoked but never defined (see the help page).

[Feng2020-4] Cite error: The named reference Feng2020 was invoked but never defined (see the help page).

[Boyajianvon_Braun2012-5] Cite error: The named reference Boyajianvon Braun2012 was invoked but never defined (see the help page).

[apj644-6] Cite error: The named reference apj644 was invoked but never defined (see the help page).

[687b-discovery-7] Cite error: The named reference 687b-discovery was invoked but never defined (see the help page).

[apj704_2_975-8] Cite error: The named reference apj704_2_975 was invoked but never defined (see the help page).

[Oeltzen17415-9] Cite error: The named reference Oeltzen17415 was invoked but never defined (see the help page).

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Observation data Epoch J2000 Equinox J2000
Gliese 687 is the small orange star located in the center of the above image.
Constellation	Draco
Right ascension	17^h 36^m 25.89931^s^[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 (R_v)	−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]
Distance	14.839 ± 0.001 ly (4.5498 ± 0.0004 pc)
Absolute magnitude (M_V)	10.87

Details

Mass	0.40±0.02^[4] `M`_☉
Radius	0.4183±0.0070^[5] `R`_☉
Luminosity	0.02128±0.00023^[5] `L`_☉
Surface gravity (log g)	4.66^[6] cgs
Temperature	3,413±28^[5] K
Metallicity [Fe/H]	+0.11 ± 0.20^[6] dex
Rotation	61.8±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
SIMBAD	data
Gliese 687 Location of Gliese 687 in the constellation Draco