54 Piscium

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Star
54 Piscium
Infrared image from 54 Psc (Spitzer Space Telescope); circled: the brown dwarf 54 Psc B
Infrared image from 54 Psc ( Spitzer Space Telescope ); circled: the brown dwarf 54 Psc B
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation fishes
Right ascension 00 h 39 m 21.8 s
declination + 21 ° 15 ′ 2 ″
Apparent brightness 5.80 likes
Typing
Known exoplanets 1
B − V color index +0.85 
U − B color index +0.57 
R − I index +0.39 
Spectral class K0 V
Astrometry
Radial velocity (−34 ± 2) km / s
parallax (90.03 ± 0.72)  mas
distance (36.23 ± 0.29)  ly
(11.11 ± 0.09)  pc  
Proper movement 
Rec. Share: (−461.32 ± 0.33)  mas / a
Dec. portion: (−370.02 ± 0.28)  mas / a
Physical Properties
Dimensions approx. 0.8  M ☉
radius (0.95 ± 0.03)  R ☉
Effective temperature approx. 5200  K
Metallicity [Fe / H] approx. +0.05
(approx. 110% of the sun)
Rotation time 44.5 d
Other names
and catalog entries
Flamsteed name 54 Piscium
Bonn survey BD + 20 ° 85
Bright Star Catalog HR 166 [1]
Henry Draper Catalog HD 3651 [2]
Hipparcos catalog HIP 3093 [3]
SAO catalog SAO 74175 [4]
Tycho catalog TYC 1193-2072-1 [5]Template: Infobox star / maintenance / specification of the TYC catalog
Other names GJ 27 • LHS 1116 • LTT 10224 • LFT 59 • NSV 245 • WDS 00394 + 2115

54 Piscium ( 54 Psc for short ), also known as HD 3651 , is a planetary system in the Pisces constellation . The central body is a main sequence star of apparent magnitude 5.9 and spectral class K0. The distance of 54 Piscium to Earth is only 36 light years and under good conditions the star can be seen with the naked eye.
The central star, called 54 Piscium A to distinguish it from the other bodies in the system, often (and before the discovery of the accompanying objects) but also simply 54 Piscium, is surrounded by two substellar companions, which are usually identified by the catalog name of the system in HD Catalog is used. The central star is accompanied by an exoplanet , HD 3651 b, at a relatively short distance , and by a brown dwarf , HD 3651 B, at a greater distance .

Central star

54 Piscium A (HD 3651 A) has about 80 percent of the mass of our sun and is somewhat less bright than this. Its metallicity is about 110 percent that of the sun (based on iron). An activity cycle of around 13 years was also observed in the star. This suggests that the main component of the system is magnetically active. Intensive observations and measurements of emission strengths suggest that 54 Piscium A is one of the best contenders for an imminent activity minimum (see Maunder minimum ).

Brown dwarf

HD 3651 B ( 54 Piscium B ) is a methane dwarf of the spectral class T7 to T8. The angular distance to the central star is 43 ", which when projected corresponds to a distance of about 480 AU. It takes over 1000 years for one orbit and has at least 50 times the mass of Jupiter. 54 Piscium B was measured independently of one another with the help of the Spitzer space telescope (Luhman et al. 2007) as well as with the help of ground-based telescopes (Murgauer et al. 2006).

Exoplanet

HD 3651 b ( 54 Piscium b , formally and also HD 3651 Ab to avoid confusion ) is an exoplanet with a minimum mass of approx. 0.23 Jupiter masses and a sidereal orbital period of 62.206 days, which forms the central star of the system at a distance of approx 0.30  astronomical units orbited with an eccentricity of 0.6. It was published in 2003 by Paul Butler et al. Discovered in 2003 using the radial velocity method.

Web links

Individual evidence

  1. ↑ a b c d Hipparcos catalog
  2. ↑ a b c SIMBAD database
  3. ↑ a b c Bright Star Catalog
  4. ↑ SPACE.com - Distorted Solar System Discovered
  5. ↑ The Exoplanet in the "Encyclopedia of Extrasolar Planets" (English)