682
Star gliese 682 |
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AladinLite | |||||||||||||
Observation dates equinox : J2000.0 , epoch : J2000.0 |
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Constellation | Scorpio | ||||||||||||
Right ascension | 17 h 37 m 3.66 s | ||||||||||||
declination | -44 ° 19 ′ 9.2 ″ | ||||||||||||
Apparent brightness | 10.95 likes | ||||||||||||
Typing | |||||||||||||
Known exoplanets | 2 | ||||||||||||
Spectral class | M3.5 | ||||||||||||
Astrometry | |||||||||||||
Radial velocity | −60.0 km / s | ||||||||||||
parallax | 199.70 ± 0.08 mas | ||||||||||||
distance | 16.32 ± 0.01 ly 5.01 pc |
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Visual absolute brightness M vis | 12.45 mag | ||||||||||||
Proper movement | |||||||||||||
Rec. Share: | −706.12 ± 0.19 mas / a | ||||||||||||
Dec. portion: | −937.91 ± 0.12 mas / a | ||||||||||||
Physical Properties | |||||||||||||
Dimensions | (0.281 ± 0.006) M ☉ | ||||||||||||
radius | (0.298 ± 0.009) R ☉ | ||||||||||||
Luminosity |
0.0022 L ☉ |
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Effective temperature | 3,028 K | ||||||||||||
Other names and catalog entries |
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Gliese 682 (also GJ 682 ) is a red dwarf in the constellation Scorpio , which is around 16 light years away and is one of the sun's neighboring stars . Despite its comparatively close proximity, it is very faint with an apparent brightness of 10.95 mag and a relatively powerful telescope is necessary for its observation . From Earth, it is near the bright star Sargas (Theta Scorpii). Two exoplanets are believed to be in orbits around the star, one of which is in the habitable zone .
distance
Determining the distance for Gliese 682
source | Parallax (mas) | Distance (pc) | Distance (Lj) | Distance ( Pm ) |
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Woolley et al. (1970) | 213 ± 5 | 4.69 ± 0.11 | 15.3 ± 0.4 | 144.9 +3.5−3.3 |
Gliese & Jahreiß (1991) | 211.6 ± 5.9 | 4.73 +0.14−0.13 | 15.4 ± 0.4 | 145.8 +4.2−4 |
van Altena et al. (1995) | 210.7 ± 7.0 | 4.75 +0.16−0.15 | 15.5 ± 0.5 | 146.4 +5−4.7 |
Perryman et al. (1997) (Hipparcos) | 198.32 ± 2.43 | 5.04 ± 0.06 | 16.45 ± 0.2 | 155.6 ± 1.9 |
van Leeuwen (2007) | 196.90 ± 2.15 | 5.08 +0.06−0.05 | 16.56 ± 0.18 | 156.7 ± 1.7 |
RECONS TOP100 (2012) | 198.09 ± 2.06 | 5.05 ± 0.05 | 16.47 ± 0.17 | 155.8 ± 1.6 |
Gaia DR2 | 199.70 ± 0.08 | 5.007 ± 0.002 | 16.32 ± 0.01 | 154.36 ± 0.06 |
Non-trigonometric distance determinations are marked in italics . The most precise determination is marked in bold .
Planetary system
On March 4, 2014, an international team of astronomers, led by Mikko Tuomi from the University of Hertfordshire, published the discovery of eight exoplanet candidates around the solar stars Gliese 180 , Gliese 442 , and Gliese 682. Four of these planets are super-earths in the habitable zone, two of them in orbits around Gliese 682. In accordance with the usual procedure for naming exoplanets, these are named Gliese 682b and Gliese 682c . Gliese 682b is the closest and smaller of the two planets to the star. It has a minimum mass of 4.4 earth masses and a radius of 1.5 earth radii assuming a rocky composition. At the time of discovery of both exoplanets, Gliese 682 was the second closest star with possibly habitable planets (after Tau Ceti ). In the meantime, however, with Gliese 832c and Kapteyn b , planet candidates still closer to the Sun have been found, which also orbit in the habitable zone of their central stars.
Planetary system of Gliese 682
Planet (by distance from the star) |
Discovery (year) |
Mass (in M ♃ ) |
Cycle time (in days) |
Major semi-axis (in AU ) |
eccentricity |
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Gliese 682 b | 2014 | 0.014 +0.012−0.008 | 17.478 +0.062−0.04 | 0.08 +0.014−0.004 | 0.08 +0.19−0.08 |
Gliese 682 c | 2014 | 0.027 +0.018−0.014 | 57.32 +0.45−0.48 | 0.176 +0.03−0.009 | 0.1 +0.19−0.1 |
Individual evidence
- ↑ a b c d e f g CD − 44 11909. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed April 20, 2019 .
- ↑ a b P. E. Kervella, F. Arenou, F. Mignard, F. Thévenin: Stellar and substellar companions of nearby stars from Gaia DR2. Binarity from proper motion anomaly . In: Astronomy & Astrophysics . 623, p. A72. arxiv : 1811.08902 . bibcode : 2019A & A ... 623A..72K . doi : 10.1051 / 0004-6361 / 201834371 .
- ↑ a b Tuomi, Mikko; Jones, Hugh RA; Barnes, John R .; Anglada-Escude, Guillem; Jenkins, James S .: Bayesian search for low-mass planets around nearby M dwarfs. Estimates for occurrence rate based on global detectability statistics . arxiv : 1403.0430 .
- ^ A b University of Puerto Rico at Arecibo: Habitable Exoplanets Catalog. Retrieved April 29, 2015 .
- ↑ University of Puerto Rico at Arecibo: GJ 682 b (warm-superterran). Retrieved April 29, 2015 .
- ^ Woolley R .; Epps EA; Penston MJ; Pocock SB: Woolley 682. Retrieved April 29, 2015 .
- ↑ Gliese, W. and Jahreiß, H .: Gl 682. Retrieved April 29, 2015 .
- ^ Van Altena WF, Lee JT, Hoffleit ED: GCTP 3992. Retrieved April 29, 2015 .
- ^ Perryman et al .: HIP 86214. Retrieved April 29, 2015 .
- ^ Van Leeuwen F .: HIP 86214. Retrieved April 29, 2015 .
- ↑ RECONS: THE ONE HUNDRED NEAREST STAR SYSTEMS. Retrieved April 29, 2015 .
- ↑ The star in VizieR. In: Gaia DR2 . Center de Données astronomiques de Strasbourg , accessed August 26, 2018 .
- ^ A b University of Puerto Rico at Arecibo: Stars with Multiple Habitable Planets Might be Common. Retrieved April 30, 2015 .
- ^ The Extrasolar Planets Encyclopaedia: Planet GJ 682 b. Retrieved April 30, 2015 .
- ^ The Extrasolar Planets Encyclopaedia: Planet GJ 682 c. Retrieved April 30, 2015 .
Web links
- SolStation.com: CD-44 11909 / Gl 682.Retrieved April 30, 2015 . (English)