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Monday, April 7, 2014

2013 ST71 - A member of the Datura cluster ?

These 7 asteroids are already recognized as belonging to the Datura cluster:

  • (1270) Datura
  • (60151) 1999UZ6 
  • (89309) 2001VN36 
  • (90265) 2003CL5 
  • (203370) 2001 WY35
  • (215619) 2003 SQ168
  • 2003 UD112


Is asteroid 2013 ST71  a member of the Datura cluster ?

At first glance, I would say yes: the orbit of 2013 ST71 is very similar to the orbit of (1270) Datura, but it is not clear to me if this happens by chance or not .


Let's look at Horizons Web -

(1270) Datura
 ElementValueUncertainty (1-sigma)  Units 
e.2073624269619966.897e-08
a2.235094166093447.619e-09AU
q1.7716196153237051.539e-07AU
i5.9885816202296165.1796e-06deg
node97.850123248398166.7015e-05deg
peri258.86746322964586.7965e-05deg
M69.44566178840651.2739e-05deg
tp2456565.057541251396
(2013-Sep-29.55754125)
4.2797e-05JED
period1220.512310873357
3.34
6.2407e-06
1.709e-08
d
yr
n.2949581063564991.5082e-09deg/d
Q2.6985687168631749.1989e-09AU

2013 ST71

 ElementValueUncertainty (1-sigma)  Units 
e.20729262417119732.4439e-07
a2.2353326392135043.0253e-08AU
q1.7719646705354085.4988e-07AU
i5.986886374438261.0741e-05deg
node97.997511815003830.00026181deg
peri258.89438164414010.00026916deg
M78.48520361323184.0622e-05deg
tp2456534.368087665562
(2013-Aug-29.86808767)
0.00013895JED
period1220.707649718649
3.34
2.4781e-05
6.785e-08
d
yr
n.29491090686862945.9869e-09deg/d
Q2.6987006078915983.6524e-08AU

A few month ago, we also mentioned that another asteroid (338309) 2002 VR17 might be a member of the same cluster - if these findings are confirmed, the Datura cluster would have at least 9 recognized members.

At the end of this embedded PDF (a list of potential asteroid pairs to be confirmed / rejected), there is an entry for 2013 ST71:



Click on asteroid names to get more details from the AstDyS service.
Click on Asteroid1_Asteroid2 distance to see a graph showing how the distance between the two asteroids varied in the past according to a simulation performed with Mercury simulator.

Kind Regards,
Alessandro Odasso

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