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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1782899581040519 4.9274e-08  
a 2.365758678074958 9.5774e-09 au
q 1.943967662476677 1.1776e-07 au
i 5.597814084056469 4.6588e-06 deg
node 110.4434214706592 4.5833e-05 deg
peri 224.2066632323368 4.6761e-05 deg
M 163.8283546213746 9.1524e-06 deg
tp 2457995.659785983768
(2017-Aug-30.15978598)
3.3455e-05 TDB
period 1329.089079537364
3.64
8.0709e-06
2.21e-08
d
yr
n .2708622059593708 1.6448e-09 deg/d
Q 2.78754969367324 1.1285e-08 au
  Orbit Determination Parameters
   # obs. used (total)      844  
   data-arc span      7125 days (19.51 yr)  
   first obs. used      1999-09-08  
   last obs. used      2019-03-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55138  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-13 07:22:50  

Additional Information
 Earth MOID = .937352 au 
 Jupiter MOID = 2.57455 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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