832

Database links to Gliese 832

Star Gliese 832
AladinLite
Observation dates equinox :  J2000.0 , epoch : J2000.0
Constellation	crane
Right ascension	21 h 33 m 33.98 s
declination	−49 ° 00 ′ 32.4 ″
Apparent brightness	8.66 likes
Typing
rel. Brightness (G-band)	7.74 ± 0.01 mag
rel. Brightness (J-band)	5.35 likes
Known exoplanets	2
B − V color index	(1.50)
U − B color index	(1.18)
R − I index	(1.19)
Spectral class	M1.5
Astrometry
Radial velocity	12.52 ± 0.15 km / s
parallax	201.41 ± 0.04  mas
distance	16.18 ± 0.01  ly 4.96 ± 0.01  pc
Visual absolute brightness M vis	10.19 likes
Proper movement
Rec. Share:	−45.83 ± 0.07  mas / a
Dec. portion:	−816.60 ± 0.06  mas / a
Physical Properties
Dimensions	(0.449 ± 0.009)  M ☉
radius	(0.441 ± 0.013)  R ☉
Luminosity	0.026  L ☉
Effective temperature	3472  K
Metallicity [Fe / H]	−0.31 ± 0.2
Other names and catalog entries
Cordoba Survey CD −49 ° 11439 Henry Draper Catalog HD 204961 [1] Gliese catalog FY 832 [2] Hipparcos catalog HIP 106440 [3] Tycho catalog TYC 8431-60-1 [4] 2MASS catalog 2MASS J21333397-4900323 [5] Other names LHS 3865, PLX 5190

Gliese 832 (also Gl 832 or GJ 832 ) is a red dwarf of the spectral class M1.5V in the constellation crane . At 16.1 light years away, it is relatively close to the sun . Gliese 832 has about half the mass and radius of the sun. The star also emits X-rays .

In 2014, the discovery of a possibly habitable exoplanet around Gliese 832 was announced, the one closest to the Sun by then.

distance

Determining the distance for Gliese 832

source	Parallax (mas)	Distance (pc)	Distance (Lj)	Distance ( Pm )
Woolley et al. (1970)	214 ± 7	4.67   +0.16−0.15	15.2 ± 0.4	144.2   +4.9−4.6
Gliese & Jahreiß (1991)	215.0 ± 6.1	4.65   +0.14−0.13	15.2 ± 0.4	143.5   +4.2−4
van Altena et al. (1995)	213.9 ± 8.8	4.68   + 0.2−0.18	15.2   +0.6−0.7	144.3   +6.2−5.7
Perryman et al. (1997) (Hipparcos)	202.53 ± 1.33	4.94 ± 0.03	16.1 ± 0.11	152.4 ± 1
Perryman et al. (1997) (Tycho)	229.00 ± 15.10	4.37   + 0.31−0.27	14.2   +1.0−0.9	134.7   +9.5−8.3
van Leeuwen (2007)	201.87 ± 1.01	4.954 ± 0.025	16.16 ± 0.08	152.9 ± 0.8
RECONS TOP100 (2012)	202.03 ± 1.00	4.95   +0.025−0.024	16.14 ± 0.08	152.7 ± 0.8
Gaia DR2 (2018)	201.41 ± 0.04	4.965 ± 0.001	16.18 ± 0.01	153.12 ± 0.03

Non-trigonometric distance determinations are marked in italics . The most precise determination is marked in bold .

Planetary system

Two planets of Gliese 832 are known. First, in September 2008, the discovery of a Jupiter-like planet was published, which was named Gliese 832b . It orbits its central star on a long-period and almost circular orbit. The data suggest an astrometric perturbation of the star of at least 0.95 arcminutes , making the Gliese 832b a good candidate for astrometric discovery. Despite its relatively large angular distance , direct imaging would be problematic due to the contrast between star and planet.

A second planet was discovered by astronomers at the University of New South Wales in 2014 and given the scientific name Gliese 832c . He's probably super-earth . According to the publication when it was discovered, Gliese 832c is located in the habitable zone of the star according to an optimistic (non-conservative) interpretation. The planet is probably at the (roughly) correct distance from Gliese 832 for liquid water to exist on its surface.

If a comet belt belongs to the planetary system of Gliese 832 , it is not demonstrably brighter than the dust brightness in the system.

Gliese planetary system 832

Planet (by distance from the star)	Discovery (year)	Mass (in M ♃ )	Cycle time (in days)	Major semi-axis (in AU )	eccentricity
Gliese 832c	2014	0.017 ± 0.003	35.68 ± 0.03	0.163 ± 0.006	0.18 ± 0.13
Gliese 832b	2008	0.68 ± 0.09	3657 ± 104	3.56 ± 0.28	0.08   +0.02−0.06

Web links

• SolStation.com: CD-49 13515 / Gl 832. Retrieved May 3, 2015 . 

Individual evidence

1. ↑ ^{a b c d e f g h i} HD 204961. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed April 20, 2019 . 
2. ↑ ^{a b c d} Bailey, J .; Butler, RP; Tinney, CG; Jones, HRA; O'Toole, S .; Carter, BD; Marcy, GW: A Jupiter-like Planet Orbiting the Nearby M Dwarf GJ832 . arxiv : 0809.0172 .
3. ↑ ^{a b c d} NASA Exoplanet Archive : GJ 832. Retrieved November 10, 2018 . 
4. ↑ ^{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 .
5. ↑ ^{a b c d e f} Space.com of June 25, 2014: Nearby Alien Planet May Be Capable of Supporting Life. Retrieved May 1, 2015 . 
6. ↑ Schmitt, JHMM; Fleming, TA; Giampapa, MS: The X-Ray View of the Low-Mass Stars in the Solar Neighborhood . bibcode : 1995ApJ ... 450..392S .
7. ^ Woolley R .; Epps EA; Penston MJ; Pocock SB: Woolley 832. Retrieved May 2, 2015 . 
8. ↑ Gliese, W. and Jahreiß, H .: Gl 832. Retrieved on May 2, 2015 . 
9. ^ Van Altena WF, Lee JT, Hoffleit ED: GCTP 5190. Retrieved May 2, 2015 . 
10. ↑ Perryman et al .: HIP 106440. Retrieved May 2, 2015 . 
11. ↑ Perryman et al .: HIP 106440. Retrieved May 2, 2015 . 
12. ^ Van Leeuwen, F .: Validation of the new Hipparcos reduction . arxiv : 0708.1752 .
13. ↑ RECONS: THE ONE HUNDRED NEAREST STAR SYSTEMS. Retrieved May 2, 2015 . 
14. ↑ Wittenmyer, RA; Tuomi, M .; Butler, RP; Jones, HRA; O'Anglada-Escude, G .; Horner, J .; Tinney, CG; Marshall, JP; Carter, BD et al .: GJ 832c: A super-earth in the habitable zone . arxiv : 1406.5587 .
15. ↑ J.-F .; Sibthorpe, B .; Kennedy, GM; Wyatt, MC; Bryden, G .; Greaves, JS; Thilliez, E .; Moro-Martín, A .; Booth, M .; Dent, WRF; Duchêne, G .; Harvey, PM; Horner, J .; Kalas, P .; Kavelaars, JJ; Phillips, NM; Rodriguez, DR; Su, KYL; Wilner, DJ et al .: A DEBRIS Disk Around The Planet Hosting M-star GJ581 Spatially Resolved with Herschel . arxiv : 1211.4898 .