Gliese 682

Gliese 682 or GJ 682 is a red dwarf. It is listed as the 49th-nearest known star to the Sun, being about 16 light years away from the Earth. Even though it is close by, it is dim with a magnitude of 10.95 and thus requires a telescope to be seen. It is located in the constellation of Scorpius, near the bright star Theta Scorpii.[1] The star is in a crowded region of sky near the Galactic Center, and so appears to be near a number of deep-sky objects from the Solar System's perspective. The star is only 0.5 degrees from the much more distant globular cluster NGC 6388.

Gliese 682
Observation data
Epoch J2000      Equinox
Constellation Scorpius
Right ascension 17h 37m 03.6613s[1]
Declination –44° 19′ 09.18″[1]
Apparent magnitude (V) 10.96[1]
Characteristics
Spectral type M3.5[1]
Apparent magnitude (B) ~12.61[1]
Apparent magnitude (V) ~10.96[1]
Apparent magnitude (J) 6.544 ±0.023[1]
Apparent magnitude (H) 5.917 ±0.038[1]
Apparent magnitude (K) 5.606 ±0.020[1]
Astrometry
Radial velocity (Rv)-60.0[1] km/s
Proper motion (μ) RA: -710.29 ± 2.85[1] mas/yr
Dec.: -938.17 ± 2.07[1] mas/yr
Parallax (π)199.6944 ± 0.0312[2] mas
Distance16.333 ± 0.003 ly
(5.0077 ± 0.0008 pc)
Absolute magnitude (MV)12.45
Other designations
CD-44 11909, GJ 682, LHS 451, LFT 1358, HIP 86214, PLX 3992.
Database references
SIMBADstar
planet b
planet c
Exoplanet Archivedata
ARICNSdata
Extrasolar Planets
Encyclopaedia		data

Hypothetical planetary system
The Gliese 682 planetary system[3]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b (unconfirmed) >4.4 M🜨 0.08 17.48 0.08 — —
c (unconfirmed) >8.7 M🜨 0.18 57.32 0.10 — —

Two candidate planets were detected orbiting Gliese 682 in 2014, one of which would be in the habitable zone.[3][4] However, a 2020 study did not find these planets and concluded that the radial velocity signals were probably caused by stellar activity.[5]

See also

References
  1. "LHS 451 -- High proper-motion Star". Centre de Données astronomiques de Strasbourg. Retrieved 2009-12-14.
  2. Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. Gaia EDR3 record for this source at VizieR.
  3. Tuomi, M.; et al. (2014). "Bayesian search for low-mass planets around nearby M dwarfs - estimates for occurrence rate based on global detectability statistics". Monthly Notices of the Royal Astronomical Society. 441 (2): 1545. arXiv:1403.0430. Bibcode:2014MNRAS.441.1545T. doi:10.1093/mnras/stu358. S2CID 32965505.
  4. "The Habitable Exoplanets Catalog". Planetary Habitability Laboratory. University of Puerto Rico at Arecibo. Retrieved 7 October 2020.
  5. Feng, Fabo; Butler, R. Paul; Shectman, Stephen A.; Crane, Jeffrey D.; Vogt, Steve; Chambers, John; Jones, Hugh R. A.; Wang, Sharon Xuesong; Teske, Johanna K.; Burt, Jenn; Díaz, Matías R.; Thompson, Ian B. (8 January 2020). "Search for Nearby Earth Analogs. II. Detection of Five New Planets, Eight Planet Candidates, and Confirmation of Three Planets around Nine Nearby M Dwarfs". The Astrophysical Journal Supplement Series. 246 (1): 11. arXiv:2001.02577. Bibcode:2020ApJS..246...11F. doi:10.3847/1538-4365/ab5e7c. S2CID 210064560.


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