FY 3021

Database links to GJ 3021 / HD 1237

Double star GJ 3021 / HD 1237
Observation dates equinox :  J2000.0 , epoch : J2000.0
AladinLite
Constellation	Little water snake
Right ascension	00 h 16 m 12.679 s
declination	-79 ° 51 ′ 04.245 ″
Apparent brightness	6.58 mag
Known exoplanets	1
Astrometry
parallax	(56.93 ± 0.02) mas
distance	(57.26 ± 0.02) ly (17.56 ± 0.01 pc )
Proper movement :
Rec. Share:	(433.91 ± 0.04) mas / a
Dec. portion:	(−56.32 ± 0.04) mas / a
orbit
Major semi-axis	3.8 "(68 AU)
Individual data
Names	A; B.
Observation data:
Apparent brightness	A.	6.59 likes
	B.
Typing:
Spectral class	A.	G6 V
	B.	M4 ± 1V
Physical Properties:
Dimensions	A.	0.9 M ☉
	B.
Other names and catalog entries
Cordoba Survey CD -80 ° 9 Henry Draper Catalog HD 1237 [1] SAO catalog SAO 258219 [2] Tycho catalog TYC 9354-780-1 [3] Hipparcos catalog HIP 1292 [4] WDS catalog WDS J00162-7951 Further designations: GJ 3021, NLTT 824

GJ 3021 (also known as HD 1237 ) is a star in the Gliese-Jahreiß catalog that is of particular scientific importance because of its similarity to the sun and the existence of an exoplanet . The star is of the spectral type G6 V and can be found in the constellation Little Water Snake. The star's surface temperature is around 5600 Kelvin , its mass is 90% of the solar mass. There are different opinions about the age of the star, which has been examined very carefully since the discovery of the exoplanet, the assessments vary between 150 million and 8.8 billion years, depending on the determination method . The star is about 57.5 light years (17.6  parsecs ) away from the Sun. 

The companion

The exoplanet orbiting the star is called GJ 3021 b and is likely a gas planet similar to Jupiter .

credentials

1. ↑ ^{a b c} HD 1237. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed December 8, 2018 . 
2. ↑ A Planetary Companion around GJ 3021 . In: Observatoire De Geneve . August.
3. ^ Saffe, C. et al .: On the Ages of Exoplanet Host Stars . In: Astronomy and Astrophysics . 443, No. 2, 2005, pp. 609 - 626. bibcode : 2005A & A ... 443..609S .