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55754 (1991 RP18)
Classification: Main-belt Asteroid          SPK-ID: 2055754
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2456800.5 (2014-May-23.0) TDB
Reference: JPL 2 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1962897184937953 7.0567e-08  
a 2.240587763371091 1.4441e-08 AU
q 1.800783422038337 1.6003e-07 AU
i 1.234606389786636 8.298e-06 deg
node 317.7767221576724 0.00026372 deg
peri 39.65497249311329 0.00026414 deg
M 271.6360846937559 1.981e-05 deg
tp 2457101.186421514136
(2015-Mar-19.68642151)
6.8884e-05 JED
period 1225.014887241421
3.35
1.1843e-05
3.242e-08
d
yr
n .2938739796139741 2.841e-09 deg/d
Q 2.680392104703845 1.7275e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      443  
   data-arc span      7871 days (21.55 yr)  
   first obs. used      1991-09-13  
   last obs. used      2013-04-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .58971  
   data source      ORB  
   producer      Otto Matic  
   solution date      2013-Aug-06 06:01:59  

Additional Information
 Earth MOID = .795526 AU 
 T_jup = 3.609 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 16.1 mag n/a MPO259697  

55754 (1991 RP18)          Discovered 1991-Sep-13 by Holt, H. E. at Palomar (675)
Reference: 20030318/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1991 RP18 = 1997 HX13 = 2000 GE12 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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