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21697 Mascharak (1999 RW54)
Classification: Main-belt Asteroid          SPK-ID: 2021697
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 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1454695620840699 3.6386e-08  
a 2.431972402056051 7.9664e-09 au
q 2.078194441728413 8.9978e-08 au
i 6.506729613373448 3.8853e-06 deg
node 180.150176180197 3.0311e-05 deg
peri 169.632000392269 3.2822e-05 deg
M 258.6956164863037 1.4238e-05 deg
tp 2459786.318214114997
(2022-Jul-25.81821412)
5.5847e-05 TDB
period 1385.276255715289
3.79
6.8066e-06
1.864e-08
d
yr
n .2598759622961367 1.2769e-09 deg/d
Q 2.785750362383688 9.1253e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1315  
   data-arc span      13418 days (36.74 yr)  
   first obs. used      1984-09-21  
   last obs. used      2021-06-17  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52213  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 05:10:40  

Additional Information
 Earth MOID = 1.07181 au 
 Jupiter MOID = 2.64454 au 
 T_jup = 3.484 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457514.5 (2016-May-06.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1455415774645027 3.6554e-08  
q 2.078442945545347 9.0417e-08 au
tp 2457011.832743350844
(2014-Dec-20.33274335)
4.9031e-05 TDB
node 180.1819448221231 3.0301e-05 deg
peri 168.9988507113997 3.2783e-05 deg
i 6.505897600788849 3.8871e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1315  
   data-arc span      13418 days (36.74 yr)  
   first obs. used      1984-09-21  
   last obs. used      2021-06-17  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52213  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 05:10:40  

Additional Information
 Jupiter MOID = 2.64454 au 
 T_jup = 3.484 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.336212481891568E-15 -3.29596740069622E-15 -2.737654178247932E-13 -9.698834327279669E-16 -5.428836398132499E-14 3.839795265816674E-16
q -3.29596740069622E-15 8.175301881942652E-15 7.942296337874681E-13 1.409109332793011E-15 1.670877015147037E-13 -8.632976204485496E-16
tp -2.737654178247932E-13 7.942296337874681E-13 2.404029715021636E-9 -9.36442808102858E-12 6.235109404672441E-10 8.896431257159547E-14
node -9.698834327279669E-16 1.409109332793011E-15 -9.36442808102858E-12 9.181605146759266E-10 -9.143886683003537E-10 -7.421475312891765E-12
peri -5.428836398132499E-14 1.670877015147037E-13 6.235109404672441E-10 -9.143886683003537E-10 1.07472759231767E-9 7.43897124610026E-12
i 3.839795265816674E-16 -8.632976204485496E-16 8.896431257159547E-14 -7.421475312891765E-12 7.43897124610026E-12 1.510921800595847E-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 15.27   n/a MPO636389  

21697 Mascharak           Discovered 1999 Sept. 7 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Smita Mascharak (b. 1989) was awarded second place in the 2005 Intel International Science and Engineering Fair for her chemistry project. She attends the Santa Cruz High School, Santa Cruz, California, 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

Alternate Designations
 1999 RW54 = 1984 SF8 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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