HD 47536

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Stern
HD 47536
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation Big dog
Right ascension 06 h 37 m 47.62 s
declination -32 ° 20 ′ 23.1 ″
Apparent brightness 5.25 likes
Typing
B − V color index +1.18 
U − B color index +1.12 
Spectral class K1 III
Astrometry
Radial velocity (+78.8 ± 0.8) km / s
parallax (8.11 ± 0.23)  mas
distance (402 ± 11)  ly
(123 ± 3)  pc  
Visual absolute brightness M vis −0.2 mag
Proper movement 
Rec. Share: (+108.06 ± 0.20)  mas / a
Dec. portion: (+64.60 ± 0.24)  mas / a
Physical Properties
radius (23 ± 2)  R ☉
Luminosity

180  L ☉

Effective temperature 4380  K
Metallicity [Fe / H] −0.68
Age approx. 9 bill.  a
Other names
and catalog entries
Cordoba Survey CD −32 ° 3216
Bright Star Catalog HR 2447 [1]
Henry Draper Catalog HD 47536 [2]
Hipparcos catalog HIP 31688 [3]
SAO catalog SAO 197019 [4]
Tycho catalog TYC 7091-1257-1 [5]Template: Infobox star / maintenance / specification of the TYC catalog
annotation
  1. ↑ roughly estimated from apparent brightness and distance

HD 47536 is a 400 light-years distant giant of the spectral class K1 with an apparent magnitude of 5.3 mag. The star is orbited by at least one substellar object, the confirmation of a second is still pending.

companion

In 2003 Setiawan et al. With the help of the radial velocity method a companion around HD 47536, for which they determined an orbital period of 712 days and a minimum mass of less than 10 Jupiter's masses, which makes the object with the systematic name HD 47536 b a potential exoplanet .

In the course of subsequent observations of the star with Coralie and FEROS, Setiawan et al. Notes on another spectroscopic companion. HD 47536 c has a longer orbital period of about 2500 days and has a minimum mass of about 7 Jupiter's masses. Based on this discovery, they also determined a revised solution for the inner companion with an orbital period of around 430 days and a minimum mass of around 5 Jupiter's masses. The confirmation of the external companion is currently pending (as of the end of 2010).

Web links

Individual evidence

  1. ↑ a b c Hipparcos catalog (ESA 1997)
  2. ↑ a b Bright Star Catalog
  3. ↑ Pulkovo radial velocities for 35493 HIP stars
  4. ↑ a b c Hipparcos, the New Reduction (van Leeuwen, 2007)