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19655 (1999 RC121)
Classification: Main-belt Asteroid          SPK-ID: 2019655
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 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05482413786665738 3.9707e-08  
a 2.986975646040905 1.5762e-08 au
q 2.823217281418011 1.1945e-07 au
i 9.312254215149597 6.0071e-06 deg
node 202.7842726216911 2.0236e-05 deg
peri 288.7571711032373 5.8851e-05 deg
M 243.444723950114 5.7413e-05 deg
tp 2459810.985545896900
(2022-Aug-19.48554590)
0.00030278 TDB
period 1885.584282163424
5.16
1.4925e-05
4.086e-08
d
yr
n .1909222533330381 1.5113e-09 deg/d
Q 3.1507340106638 1.6626e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1854  
   data-arc span      8685 days (23.78 yr)  
   first obs. used      1997-04-28  
   last obs. used      2021-02-06  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50398  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:00:44  

Additional Information
 Earth MOID = 1.85359 au 
 Jupiter MOID = 1.89772 au 
 T_jup = 3.235 
[ 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 13.46   n/a E2021B10  
diameter diameter 6.828 km 0.137 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.181   0.031 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

19655 (1999 RC121)          Discovered 1999-Sep-09 by LINEAR at Socorro
Reference: 20001211/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 RC121 = 1997 HE4 = 1998 KK46 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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