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74778 (1999 RR239)
Classification: Main-belt Asteroid          SPK-ID: 2074778
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1785342542849054 4.032e-08  
a 2.365568041330535 9.0525e-09 au
q 1.943233115111384 9.8493e-08 au
i 5.597930811780807 3.3491e-06 deg
node 110.4449650008672 3.9686e-05 deg
peri 224.1726004729816 4.0603e-05 deg
M 272.2391494571439 9.2095e-06 deg
tp 2459324.466359847703
(2021-Apr-19.96635985)
3.4532e-05 TDB
period 1328.928432481637
3.64
7.6283e-06
2.089e-08
d
yr
n .2708949490438224 1.555e-09 deg/d
Q 2.787902967549687 1.0669e-08 au
  Orbit Determination Parameters
   # obs. used (total)      989  
   data-arc span      7590 days (20.78 yr)  
   first obs. used      1999-09-08  
   last obs. used      2020-06-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53414  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 23:50:46  

Additional Information
 Earth MOID = .937503 au 
 Jupiter MOID = 2.57712 au 
 T_jup = 3.520 
[ 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 15.8   n/a MPO351370  
diameter diameter 1.915 km 0.322 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.277   0.090 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

74778 (1999 RR239)          Discovered 1999-Sep-08 by LONEOS at Anderson Mesa
Reference: 20040415/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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