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21080 (1991 RD18)
Classification: Main-belt Asteroid          SPK-ID: 2021080
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 .0449598833988016 2.6341e-08  
a 2.445456349907965 8.4761e-09 au
q 2.335508917559244 6.5431e-08 au
i 3.886460196641661 3.6936e-06 deg
node 157.7915129324082 4.4277e-05 deg
peri 108.710521129394 6.3406e-05 deg
M 312.6975204184857 4.7199e-05 deg
tp 2459384.035342236088
(2021-Jun-18.53534224)
0.00018343 TDB
period 1396.813101332914
3.82
7.2622e-06
1.988e-08
d
yr
n .2577295413799232 1.34e-09 deg/d
Q 2.555403782256686 8.8572e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2083  
   data-arc span      10750 days (29.43 yr)  
   first obs. used      1991-09-13  
   last obs. used      2021-02-17  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48632  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:38:36  

Additional Information
 Earth MOID = 1.32131 au 
 Jupiter MOID = 2.46242 au 
 T_jup = 3.494 
[ 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 14.38   n/a E2021B10  
diameter diameter 7.411 km 0.094 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.059   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21080 (1991 RD18)          Discovered 1991-Sep-13 by Holt, H. E. at Palomar
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1991 RD18 = 1998 MO21 = 1999 UL14 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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