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21928 Prabakaran (1999 VX55)
Classification: Main-belt Asteroid          SPK-ID: 2021928
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06823067430077345 3.8748e-08  
a 2.730822607963587 1.2372e-08 au
q 2.544496740026435 1.0548e-07 au
i 4.077925057859765 4.3226e-06 deg
node 212.8809317362521 4.8905e-05 deg
peri 13.81462374794629 5.6283e-05 deg
M 99.98489854369994 2.6739e-05 deg
tp 2458938.705499882875
(2020-Mar-30.20549988)
0.00012286 TDB
period 1648.30911910296
4.51
1.1201e-05
3.067e-08
d
yr
n .2184056351007259 1.4842e-09 deg/d
Q 2.91714847590074 1.3216e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1365  
   data-arc span      8922 days (24.43 yr)  
   first obs. used      1997-03-05  
   last obs. used      2021-08-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50241  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 22:46:19  

Additional Information
 Earth MOID = 1.53553 au 
 Jupiter MOID = 2.05643 au 
 T_jup = 3.347 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457210.5 (2015-Jul-07.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06659705499102081 3.8909e-08  
q 2.546814453736401 1.0538e-07 au
tp 2457286.152992449722
(2015-Sep-20.65299245)
0.00012714 TDB
node 213.0435075633005 4.8919e-05 deg
peri 12.39970566884432 5.6567e-05 deg
i 4.077689908557163 4.3226e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1365  
   data-arc span      8922 days (24.43 yr)  
   first obs. used      1997-03-05  
   last obs. used      2021-08-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50241  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 22:46:19  

Additional Information
 Jupiter MOID = 2.05643 au 
 T_jup = 3.347 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.513907227480138E-15 -4.07732136708216E-15 -9.939812657149139E-13 4.888882118683194E-15 -2.35935361985554E-13 -6.654627238315953E-16
q -4.07732136708216E-15 1.110501654454154E-14 2.413405380077062E-12 -1.371377016937471E-14 5.751408921609863E-13 1.994802490439601E-15
tp -9.939812657149139E-13 2.413405380077062E-12 1.616426453581452E-8 1.036535417740432E-11 3.623424905531604E-9 1.237194835604838E-13
node 4.888882118683194E-15 -1.371377016937471E-14 1.036535417740432E-11 2.393099285932461E-9 -2.384173610584584E-9 -1.305827847450641E-11
peri -2.35935361985554E-13 5.751408921609863E-13 3.623424905531604E-9 -2.384173610584584E-9 3.199868382929268E-9 1.307948920109932E-11
i -6.654627238315953E-16 1.994802490439601E-15 1.237194835604838E-13 -1.305827847450641E-11 1.307948920109932E-11 1.868447595599371E-11

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.64   n/a E2021B10  
diameter diameter 5.907 km 0.083 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 12.616 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.088   0.016 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21928 Prabakaran           Discovered 1999 Nov. 4 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Sabrina Lakshmi Prabakaran (b. 1991) is a finalist in the 2005 Discovery Channel Young Scientist Challenge (DCYSC), a middle school science competition, for her biochemistry, medicine, health, & microbiology project. She attends the Canterbury School, Fort Myers, Florida.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20051019/MPCPages.arcLast Updated: 2005-10-26

Alternate Designations
 1999 VX55 = 1997 EB50 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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