BD −4 ° 782

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Star
BD −4 ° 782
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation Eridanus
Right ascension 04 h 15 m 9.53 s
declination -04 ° 25 ′ 5.9 ″
Apparent brightness 9.38 likes
Typing
B − V color index (1.23) 
U − B color index (1.19) 
R − I index (0.64) 
Spectral class K5 V
Astrometry
Radial velocity (24.32 ± 0.23) km / s
parallax (28.50 ± 0.24)  mas
distance (114 ± 1)  ly
(35)  pc
Proper movement 
Rec. Share: (90.33 ± 4.30)  mas / a
Dec. portion: (−96.25 ± 4.40)  mas / a
Physical Properties
Effective temperature 4410  K
Other names
and catalog entries
Bonn survey BD −4 ° 782
Gliese catalog FY 1069 [1]
Hipparcos catalog HIP 19832 [2]
SAO catalog SAO 131057 [3]
Tycho catalog TYC 4729-1265-1 [4]Template: Infobox star / maintenance / specification of the TYC catalog
2MASS catalog 2MASS J04150951-0425060 [5]

HIP 19832 , also known as BD −4 ° 782 , is a main sequence star of spectral class K in the constellation Eridanus , a little more than 110 light years from Earth . With an apparent brightness of approx. 9.4 mag, it can no longer be seen with the naked eye, even under optimal observation conditions. In 1996, a team led by Michel Mayor discovered a low-mass companion that could be a brown dwarf . This is called HIP 19832 B (or BD −4 ° 782 B ) and orbits the main star in a little more than 700 days.

Individual evidence

  1. ↑ a b c d e f BD-04 782. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed October 27, 2019 .
  2. ↑ a b Hipparcos catalog (ESA 1997)
  3. ^ Hipparcos, the New Reduction (van Leeuwen, 2007)
  4. ↑ NASA Exoplanet Science Institute: Properties of Nearby Stars , accessed August 18, 2018
  5. ↑ S. Reffert, A. Quirrenbach: Mass constraints on substellar companion candidates from the re-reduced intermediate astrometric data: nine confirmed planets and two confirmed brown dwarfs. In: Astronomy & Astrophysics. 527, 2011, p. A140, doi : 10.1051 / 0004-6361 / 201015861 .