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101908 (1999 RG4)
Classification: Main-belt Asteroid          SPK-ID: 2101908
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .175318379470352 8.2524e-08  
a 3.169572540762357 3.5036e-08 au
q 2.613888219302174 2.7379e-07 au
i 16.27244499896047 9.0937e-06 deg
node 307.6203986194901 2.0901e-05 deg
peri 54.09725840424821 2.9344e-05 deg
M 250.7502869261628 2.4655e-05 deg
tp 2459825.985540950492
(2022-Sep-03.48554095)
0.00014815 TDB
period 2061.101932505683
5.64
3.4175e-05
9.357e-08
d
yr
n .1746638505948843 2.8961e-09 deg/d
Q 3.72525686222254 4.1179e-08 au
  Orbit Determination Parameters
   # obs. used (total)      447  
   data-arc span      7624 days (20.87 yr)  
   first obs. used      1999-07-13  
   last obs. used      2020-05-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .57206  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 19:57:50  

Additional Information
 Earth MOID = 1.64346 au 
 Jupiter MOID = 1.84382 au 
 T_jup = 3.117 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457390.5 (2016-Jan-03.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1744070635599633 8.2217e-08  
q 2.618560172964175 2.7268e-07 au
tp 2457765.948917511125
(2017-Jan-12.44891751)
0.00012845 TDB
node 307.6297807552714 2.0901e-05 deg
peri 54.46442318176919 2.9515e-05 deg
i 16.26805614892761 9.0909e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      447  
   data-arc span      7624 days (20.87 yr)  
   first obs. used      1999-07-13  
   last obs. used      2020-05-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .57206  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 19:57:50  

Additional Information
 Jupiter MOID = 1.84382 au 
 T_jup = 3.117 
Orbit Covariance (6×6)
  e q tp node peri i
e 6.759661100472879E-15 -2.230983973228033E-14 -6.48371441692285E-12 -1.470417913555447E-14 -1.060953944502641E-12 -5.876278283277299E-15
q -2.230983973228033E-14 7.435594172636672E-14 2.252650833651069E-11 5.719909990650656E-14 3.643151242406242E-12 2.349181655084359E-14
tp -6.48371441692285E-12 2.252650833651069E-11 1.650064167200319E-8 2.11366282305141E-11 2.71395745508547E-9 1.105600894573528E-11
node -1.470417913555447E-14 5.719909990650656E-14 2.11366282305141E-11 4.368371251851173E-10 -4.152352611835896E-10 7.879844025078811E-11
peri -1.060953944502641E-12 3.643151242406242E-12 2.71395745508547E-9 -4.152352611835896E-10 8.711643683206978E-10 -7.39690503112845E-11
i -5.876278283277299E-15 2.349181655084359E-14 1.105600894573528E-11 7.879844025078811E-11 -7.39690503112845E-11 8.26440899534338E-11

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 14.50   n/a E2021B55  
diameter diameter 7.330 km 0.424 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.069   0.012 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

101908 (1999 RG4)          Discovered 1999-Sep-05 by CSS at Catalina
Reference: 20051019/Numbers.arcLast Updated: 2005-10-26

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Alternate Designations
 1999 RG4 = 2002 AU164 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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