HD 47536
Stern HD 47536 |
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AladinLite | |||||||||||||
Observation dates equinox : J2000.0 , epoch : J2000.0 |
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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 |
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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 ☉ |
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Effective temperature | 4380 K | ||||||||||||
Metallicity [Fe / H] | −0.68 | ||||||||||||
Age | approx. 9 bill. a | ||||||||||||
Other names and catalog entries |
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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
- ↑ a b c Hipparcos catalog (ESA 1997)
- ↑ a b Bright Star Catalog
- ↑ Pulkovo radial velocities for 35493 HIP stars
- ↑ a b c Hipparcos, the New Reduction (van Leeuwen, 2007)