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JPL Small-Body Database Browser
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52228 Protos (1977 RN)
Classification: Outer Main-belt Asteroid          SPK-ID: 2052228
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 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1228281252417318 6.7813e-08  
a 3.207478951216694 2.952e-08 au
q 2.813510324886431 2.0876e-07 au
i 27.91802999425497 6.1242e-06 deg
node 48.21881121697307 9.2114e-06 deg
peri 331.9977297020718 1.956e-05 deg
M 121.3243270063458 1.7216e-05 deg
tp 2458293.385831053990
(2018-Jun-23.88583105)
9.8177e-05 TDB
period 2098.186794864717
5.74
2.8966e-05
7.93e-08
d
yr
n .1715767160870019 2.3687e-09 deg/d
Q 3.601447577546957 3.3146e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1003  
   data-arc span      15492 days (42.41 yr)  
   first obs. used      1977-09-06  
   last obs. used      2020-02-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53318  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 10:24:10  

Additional Information
 Earth MOID = 1.83968 au 
 Jupiter MOID = 1.86271 au 
 T_jup = 2.999 
[ 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 13.6   n/a MPO253694  
diameter diameter 5.589 km 1.622 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.271   0.176 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

52228 Protos           Discovered 1977 Sept. 5 by L. D. Schmadel at the European Southern Observatory.
This Greek word indicates the discoverer's first minor planet detection.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20040107/MPCPages.arcLast Updated: 2004-01-07

[ show close-approach data ]
Alternate Designations
 1977 RN = 2001 SK109 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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