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JPL Small-Body Database Browser
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91556 (1999 RT220)
Classification: Main-belt Asteroid          SPK-ID: 2091556
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2089542800058574 6.6735e-08  
a 2.765062721165279 1.7105e-08 au
q 2.187291031093151 1.8065e-07 au
i 12.22623756906511 6.2266e-06 deg
node 199.4645393477252 2.1276e-05 deg
peri 177.7432991807964 2.3901e-05 deg
M 161.8605364261999 1.371e-05 deg
tp 2458245.417540011003
(2018-May-06.91754001)
5.9743e-05 TDB
period 1679.406800433899
4.60
1.5584e-05
4.267e-08
d
yr
n .2143614042214124 1.9891e-09 deg/d
Q 3.342834411237406 2.068e-08 au
  Orbit Determination Parameters
   # obs. used (total)      585  
   data-arc span      7541 days (20.65 yr)  
   first obs. used      1999-09-05  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52571  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 16:42:22  

Additional Information
 Earth MOID = 1.18927 au 
 Jupiter MOID = 2.12032 au 
 T_jup = 3.275 
[ 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 15.1   n/a MPO453355  
diameter diameter 5.486 km 0.324 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.059   0.012 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

91556 (1999 RT220)          Discovered 1999-Sep-05 by CSS at Catalina
Reference: 20041028/Numbers.arcLast Updated: 2004-10-29

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