Peter 229

Database links to Gliese 229

Double star
Gliese 229

left: Discovery of GJ 229 B at the Palomar Observatory
right: image from the Hubble Space Telescope (NASA)

Observation
dates equinox : J2000.0 , epoch : J2000.0

Hare

06 ^h 10 ^m 34.6 ^s

−21 ° 51 ′ 52.7 ″

8.12 likes

Known exoplanets

2

Position of the attendant ( JD 2450398)

Angular distance

7 ", 674 ± 0", 007

Position angle

163 °, 91 ± 0 °, 10

Astrometry

parallax

(173.70 ± 0.05) mas

distance

(18.77 ± 0.01) ly
(5.76 ± 0.01 pc )

Individual data

Names

A ; B.

Observation data:

Apparent brightness

A.

8.13 mag

B.

Typing:

Spectral class

A.

M1 V

B.

T6.5

B − V color index

A.

(1.19)

U − B color index

A.

(1.48)

Physical Properties:

Absolute vis.
Brightness M _vis

A.

+9.3 mag

B.

Dimensions

A.

(0.563 ± 0.042) M _☉

B.

0.03 M _☉

radius

A.

(0.547 ± 0.044) R _☉

B.

Luminosity

A.

0.03 L _☉

B.

Effective temperature

A.

3560 K

B.

~ 850 K

Other names
and catalog entries

Bonn survey	BD -21 ° 1377
Henry Draper Catalog	HD 42581 [1]
SAO catalog	SAO 171334 [2]
Tycho catalog	TYC 5945-765-1 [3]
Hipparcos catalog	HIP 29295 [4]
Further designations:	LHS 1827, GJ 229

Gliese 229 (Gl 229, GJ 229) is a star in the constellation Rabbit . It is a double system 18.8 light years away.

Gliese 229 A is a red dwarf of the spectral type M1, while Gliese 229 B is a brown dwarf of the spectral class T6 with 20 to 50 times the mass of Jupiter and a surface temperature of around 850 Kelvin. The distance between the two components is approximately 50 astronomical units .

Gliese 229 B is the first unequivocally proven brown dwarf (Nakajima et al., 1995).

In 2014, an exoplanet was discovered around Gliese 229 A (Gliese 229 A b) and another in 2020.

Size and temperature comparison between the sun , Gliese 229 A + B, Teide 1 and Jupiter

table

Gliese 229 companion
Planet (order from the star)	Discovered	Mass ( earth masses )	Major semiaxis of the railway ( AU )	Rotation time ( days )	eccentricity
Gliese 229 A c	2020	7.93 ^+2.39_−3.44	0.339 ^+0.024_−0.029	122.0 ± 0.4	0.29 ^+0.06_−0.26
Gliese 229 A b	2014	10.02 ^+3.35_−6.10	0.896 ^+0.069_−0.073	523.2 ^+13.0_−7.0	0.17 ^+0.07_−0.17

Web links

Commons : Gliese 229 - Collection of images, videos and audio files

scinexx.de: The first clear brown dwarf: Gliese 229b May 7, 2010

Individual evidence

↑ ^a ^b ^c ^d ^e ^f HD 42581. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed December 6, 2018 .
↑ HD 42581 B. In: SIMBAD. Center de Données astronomiques de Strasbourg, accessed December 6, 2018 .
↑ ^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 .
^ GJ 229 B. In: Extrasolar Planets Encyclopaedia . Retrieved December 6, 2018 .
↑ ^a ^b ^c M. Tuomi et al .: Bayesian search for low-mass planets around nearby M dwarfs - estimates for occurrence rate based on global detectability statistics . In: MNRAS . 441, No. 2, pp. 1545-1569. arxiv : 1403.0430 . bibcode : 2014MNRAS.441.1545T . doi : 10.1093 / mnras / stu358 .
↑ T. Nakajima, T. Tsuji, Y. Takeda: Physical Properties of Gliese 229B Based on Newly Determined Carbon and Oxygen Abundances of Gliese 229A . In: The Astronomical Journal . 150, No. 2. arxiv : 1506.03178 . bibcode : 2015AJ .... 150 ... 53N . doi : 10.1088 / 0004-6256 / 150/2/53 .
^ T. Nakajima et al .: Discovery of a cool brown dwarf . In: Nature . 378, No. 6556, 1995, pp. 463-465. bibcode : 1995Natur.378..463N . doi : 10.1038 / 378463a0 .
↑ ^a ^b Fabo Feng et al .: Search for Nearby Earth Analogs II. detection of five new planets, eight planet candidates, and confirmation of three planets around within nearby M dwarfs ∗ . In: The Astrophysical Journal Supplement Series . 246, No. 1, August. arxiv : 2001.02577 . bibcode : 2020ApJS..246 ... 11F . doi : 10.3847 / 1538-4365 / ab5e7c .

[Simbad-1] ↑ ^a ^b ^c ^d ^e ^f HD 42581. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed December 6, 2018 .

[Simbad2-2] HD 42581 B. In: SIMBAD. Center de Données astronomiques de Strasbourg, accessed December 6, 2018 .

[Kervella2019-3] 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 .

[EPE-4] GJ 229 B. In: Extrasolar Planets Encyclopaedia . Retrieved December 6, 2018 .

[Tuomi2014-5] M. Tuomi et al .: Bayesian search for low-mass planets around nearby M dwarfs - estimates for occurrence rate based on global detectability statistics . In: MNRAS . 441, No. 2, pp. 1545-1569. arxiv : 1403.0430 . bibcode : 2014MNRAS.441.1545T . doi : 10.1093 / mnras / stu358 .

[Nakajima2015-6] T. Nakajima, T. Tsuji, Y. Takeda: Physical Properties of Gliese 229B Based on Newly Determined Carbon and Oxygen Abundances of Gliese 229A . In: The Astronomical Journal . 150, No. 2. arxiv : 1506.03178 . bibcode : 2015AJ .... 150 ... 53N . doi : 10.1088 / 0004-6256 / 150/2/53 .

[Nakajima1995-7] T. Nakajima et al .: Discovery of a cool brown dwarf . In: Nature . 378, No. 6556, 1995, pp. 463-465. bibcode : 1995Natur.378..463N . doi : 10.1038 / 378463a0 .

[Feng2020-8] Fabo Feng et al .: Search for Nearby Earth Analogs II. detection of five new planets, eight planet candidates, and confirmation of three planets around within nearby M dwarfs ∗ . In: The Astrophysical Journal Supplement Series . 246, No. 1, August. arxiv : 2001.02577 . bibcode : 2020ApJS..246 ... 11F . doi : 10.3847 / 1538-4365 / ab5e7c .