Kruger 60

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Double star
Kruger 60
Observation
dates equinox :  J2000.0 , epoch : J2000.0
AladinLite
Constellation Cepheus
Astrometry
parallax (249.39 ± 0.17)
(249.97 ± 0.74) mas
distance  (13.07 ± 0.01)
(13.04 ± 0.04) Lj
((4.01 ± 0.01)
(4.00 ± 0.01) pc )
Proper movement :
Rec. Share: (−725.23 ± 0.54)
(−934.10 ± 1.31) mas / a
Dec. portion: (−223.46 ± 0.35)
(−686.24 ± 1.41) mas / a
orbit 
period 44.67 a
Major semi-axis 2.383 "
eccentricity 0.410
Argument of the node 154.5 °
Epoch of the periastron 1970.22
Argument of the periapsis 211.0 °
Individual data
Names A; B / DO Cephei
Observation data:
Right ascension

A. 222759.55822 h 27 m 59,558 s
B / DO Cephei 222759.79622 h 27 m 59,796 s
declination

A. 2574142.081+ 57 ° 41 ′ 42.081 ″
B / DO Cephei 2574149.747+ 57 ° 41 ′ 49.747 ″
Apparent brightness A. 9.59 likes
B / DO Cephei 11.4 (10.3 to 11.4) mag
Typing:
Spectral class A. M3 V
B / DO Cephei M4 V
Physical Properties:
Absolute vis.
Brightness M vis 		A. 11.76 mag
B / DO Cephei 13.46 mag
Dimensions A. 0.271 M ☉
B / DO Cephei 0.176 M ☉
radius A. 0.35 R ☉
B / DO Cephei 0.24 R ☉
Luminosity A. 0.010 L ☉
B / DO Cephei 0.0034 L ☉
Effective temperature A. 3180 K
B / DO Cephei 2890 K
Other names
and catalog entries
Bonn survey BD + 56 ° 2783
Henry Draper Catalog HD 239960 [1]
Hipparcos catalog HIP 110893 [2]
Tycho catalog TYC 3991-92-1 [3] TYC 3991-92-2 [4]
WDS catalog WDS J22280 + 5742
Further designations: GJ 860, G 232-075, Vys 207, GCTP 5438.00
  LHS 3814 DO Cephei, LHS 3815

Template: Infobox double star / maintenance / RekDekSizeLeerTemplate: Infobox double star / maintenance / single coordinates

Kruger 60 is a binary system in about 13 light-years away from the sun . Both components are red dwarfs that orbit each other in 44.6 years.

The larger primary star is named Kruger 60 A , the smaller secondary star is named Kruger 60 B (also DO Cephei ). Component A has 27% of the solar mass and 35% of the solar radius , component B about 18% of the solar mass and 24% of the solar radius. The latter is an irregular flare star and typically doubles the brightness within eight minutes and returns to normal.

Both stars are on average 9.5 AU apart, which is roughly the mean distance from Saturn to the Sun. However, due to the eccentric orbit of the two stars, the mutual distance varies between up to 5.5 AU in the periastron and up to 13.5 in the apastron .

The system orbits within the Milky Way at a varying distance from the center between 7 and 9 kiloparsecs with an orbital eccentricity of 0.126 to 0.130.

distance

Determining the distance for Kruger 60

source Parallax (mas) Distance (pc) Distance (Lj) Distance ( Pm )
Woolley et al. (1970) 253 ± 3 3.95 ± 0.05 12.89 ± 0.15 122   +1.5−1.4
Gliese & Jahreiß (1991) 251.9 ± 2.3 3.97 ± 0.04 12.95 ± 0.12 122.5 ± 1.1
van Altena et al. (1995) 251.5 ± 3.7 3.98 ± 0.06 12.97 ± 0.19 122.7 ± 1.8
Perryman et al. (1997) (Hipparcos) 249.52 ± 3.03 4.01 ± 0.05 13.07 ± 0.16 123.7 ± 1.5
Perryman et al. (1997) (Tycho) (A) 225.00 ± 25.60 4.4   +0.6−0.5 14.5   +1.9−1.5 137.1   +17.6−14
Perryman et al. (1997) (Tycho) (B)
Söderhjelm (1999) 247.5 ± 1.5 4.04   +0.025−0.024 13.18 ± 0.08 124.7 ± 0.8
van Leeuwen (2007) 249.94 ± 1.87 4.001 ± 0.03 13.05 ± 0.1 123.5 ± 0.9
RECONS TOP100 (2012) 248.06 ± 1.39 4.031   +0.023−0.022 13.15 ± 0.07 124.4 ± 0.7
Gaia DR2 (2018) 249.39 ± 0.17
249.97 ± 0.74 		4.001 ± 0.003
4.001 ± 0.012 		13.07 ± 0.01
13.04 ± 0.04 		123.66 ± 0.08
123.37 ± 0.36

Non-trigonometric distance determinations are marked in italics . The most precise determination is marked in bold .

further reading

  • James Kaler, Extreme Stars , Cambridge 2001, p. 32

Web links

Individual evidence

  1. ↑ HD 239960. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed on November 10, 2018 .
  2. ↑ HD 239960A. In: SIMBAD. Center de Données astronomiques de Strasbourg, accessed on November 10, 2018 .
  3. ↑ HD 239960B. In: SIMBAD. Center de Données astronomiques de Strasbourg, accessed on November 10, 2018 .
  4. ^ Henry, Todd J. et al .: The solar neighborhood, 1: Standard spectral types (K5-M8) for northern dwarfs within eight parsecs . bibcode : 1994AJ .... 108.1437H .
  5. ↑ a b Delfosse, X .; Forveille; Segransan; Beuzite; Udry; Perrier; Mayor: Accurate masses of very low mass stars: IV Improved mass-luminosity relations . arxiv : astro-ph / 0010586 .
  6. ↑ a b Pasinetti Fracassini, LE et al .: Catalog of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third Edition - Comments and Statistics . arxiv : astro-ph / 0012289 .
  7. ^ García-Sánchez, J. et al .: Stellar encounters with the solar system . bibcode : 2001A & A ... 379..634G .
  8. ^ Woolley R .; Epps EA; Penston MJ; Pocock SB: Woolley 860. Retrieved April 3, 2015 .
  9. ↑ Gliese, W. and Jahreiß, H. (1991): Gl 860. Retrieved on April 3, 2015 .
  10. ^ Van Altena WF, Lee JT, Hoffleit ED: GCTP 5438. Retrieved April 3, 2015 .
  11. ↑ Perryman et al .: HIP 110893. Retrieved April 3, 2015 .
  12. ↑ Perryman et al .: HIP 110893. Retrieved April 3, 2015 .
  13. ↑ Perryman et al .: TYC 3991-92-2. Retrieved April 3, 2015 .
  14. ^ Söderhjelm, Staffan: HIP 110893. Retrieved April 3, 2015 .
  15. ^ Van Leeuwen F .: HIP 110893. Retrieved April 3, 2015 .
  16. ↑ RECONS: THE ONE HUNDRED NEAREST STAR SYSTEMS. Retrieved April 3, 2015 .