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21078 (1991 RR16)
Classification: Outer Main-belt Asteroid          SPK-ID: 2021078
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 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08861716858422103 4.6559e-08  
a 3.394719028350616 2.9274e-08 au
q 3.093888639919207 1.6254e-07 au
i 8.07788914312632 6.586e-06 deg
node 23.47009943366066 3.344e-05 deg
peri 282.6449820985056 5.5804e-05 deg
M 286.6020472053955 4.9078e-05 deg
tp 2459666.285135640814
(2022-Mar-27.78513564)
0.00031434 TDB
period 2284.568471547607
6.25
2.9551e-05
8.091e-08
d
yr
n .1575789933562944 2.0383e-09 deg/d
Q 3.695549416782025 3.1868e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1548  
   data-arc span      12691 days (34.75 yr)  
   first obs. used      1985-10-18  
   last obs. used      2020-07-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47169  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 01:59:02  

Additional Information
 Earth MOID = 2.09125 au 
 Jupiter MOID = 1.58797 au 
 T_jup = 3.126 
[ 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 12.68   n/a E2021B10  
diameter diameter 14.807 km 0.167 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.067   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21078 (1991 RR16)          Discovered 1991-Sep-15 by Holt, H. E. at Palomar
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1991 RR16 = 1985 UC6 = 1998 WF20 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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