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21720 Pilishvili (1999 RQ119)
Classification: Main-belt Asteroid          SPK-ID: 2021720
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1173901418918554 3.0155e-08  
a 2.309377075810255 6.3248e-09 au
q 2.038278973199091 6.8992e-08 au
i 7.567469010150317 3.627e-06 deg
node 174.1223374137884 2.1454e-05 deg
peri 109.6764389991332 2.6643e-05 deg
M 61.09327572257617 1.433e-05 deg
tp 2458982.963762010641
(2020-May-13.46376201)
5.1104e-05 TDB
period 1281.860315229911
3.51
5.2661e-06
1.442e-08
d
yr
n .2808418325482145 1.1537e-09 deg/d
Q 2.580475178421419 7.0673e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1861  
   data-arc span      15494 days (42.42 yr)  
   first obs. used      1978-09-06  
   last obs. used      2021-02-06  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48133  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:52:11  

Additional Information
 Earth MOID = 1.03521 au 
 Jupiter MOID = 2.56353 au 
 T_jup = 3.565 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.02   n/a E2021B10  
diameter diameter 3.163 km 0.150 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 4. h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on fragmentary lightcurve(s), may be completely wrong.
Published Reference List:
[Pravec, P.; Wolf, M.; Sarounova, L. (2011) http://www.asu.cas.cz/~ppravec/neo.htm]
geometric albedo albedo 0.158   0.020 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

21720 Pilishvili           Discovered 1999 Sept. 9 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Anna Pilishvili (b. 1988) was awarded second place in the 2005 Intel International Science and Engineering Fair for her botany project. She attends the Forest Hills High School, Forest Hills, New York, U.S.A.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20050822/MPCPages.arcLast Updated: 2005-08-26

[ show close-approach data ]
Alternate Designations
 1999 RQ119 = 1978 RT10 = 1998 DU5 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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