HD 217580

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Star
HD 217580
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation Aquarius
Right ascension 23 h 01 m 51.54 s
declination -03 ° 50 ′ 55.4 ″
Apparent brightness 7.48 likes
Typing
Spectral class K4 V
Astrometry
Radial velocity (−44.1 ± 0.4) km / s
parallax (58.70 ± 0.92)  mas
distance (55.6 ± 0.9)  ly
(17.0 ± 0.3)  pc  
Visual absolute brightness M vis +6.3 mag
Proper movement 
Rec. Share: (+396.20 ± 0.93)  mas / a
Dec. portion: (−207.68 ± 0.73)  mas / a
Physical Properties
radius 0.96  R ☉
Effective temperature 4590  K
Other names
and catalog entries
Bonn survey BD −4 ° 5804
Henry Draper Catalog HD 217580 [1]
Hipparcos catalog HIP 113718 [2]
SAO catalog SAO 146456 [3]
Tycho catalog TYC 5245-1012-1 [4]Template: Infobox star / maintenance / specification of the TYC catalog
Other names GJ 886 • LHS 6415
annotation
  1. ↑ Estimated from apparent brightness and distance.

HD 217580 is a main sequence star of spectral class K in the constellation Aquarius, about 56  light years from Earth . With an apparent brightness of 7.48 mag, it can no longer be seen with the naked eye, even under optimal observation conditions. The star has a spectroscopic companion that is believed to be a red dwarf .

Spectroscopic companion

HD 217580 is orbited by a spectroscopic companion with a period of (454.7 ± 0.9) days and an eccentricity of (0.520 ± 0.022). Based on the mass determination of (0.161 ± 0.013)  M ☉ , it is very likely a stellar object.

Sources and individual references

  1. ↑ a b c Hipparcos catalog (ESA 1997)
  2. ↑ Pulkovo radial velocities for 35493 HIP stars
  3. ↑ a b c Hipparcos, the New Reduction (van Leeuwen, 2007)
  4. ↑ Halbwachs et al .: Exploring the brown dwarf desert with Hipparcos ; in: Astronomy and Astrophysics, Vol. 355, pp. 581ff. (2000), bibcode : 2000A & A ... 355..581H
  5. ↑ Ribas, Ignasi; Jordi, Miralda-Escudé: The eccentricity-mass distribution of exoplanets: signatures of different formation mechanisms? ; in: Astronomy and Astrophysics, Vol. 464, Issue 2, pp. 779ff. (2007), bibcode : 2007A & A ... 464..779R