Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
IMPORTANT: The SSD Announcement email list is now available. Major changes are coming in the near future, including possible hostname and/or URL changes. To be notified of such changes, subscribe to this email list.

Please visit this page for more details.


JPL Small-Body Database Browser
Search: [ help ]  
85191 (1991 RP4)
Classification: Main-belt Asteroid          SPK-ID: 2085191
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 .2583537087797125 4.7825e-08  
a 2.758062742731761 1.7112e-08 au
q 2.045507004099864 1.2957e-07 au
i 8.248530679359362 5.4435e-06 deg
node 228.2396005508169 3.519e-05 deg
peri 118.8868926525687 3.6638e-05 deg
M 16.86810813202005 1.3292e-05 deg
tp 2458522.108582974826
(2019-Feb-07.60858297)
6.1284e-05 TDB
period 1673.033508452095
4.58
1.557e-05
4.263e-08
d
yr
n .2151779974407537 2.0025e-09 deg/d
Q 3.470618481363657 2.1532e-08 au
  Orbit Determination Parameters
   # obs. used (total)      625  
   data-arc span      9963 days (27.28 yr)  
   first obs. used      1991-09-07  
   last obs. used      2018-12-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50148  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-13 04:18:37  

Additional Information
 Earth MOID = 1.05377 au 
 Jupiter MOID = 2.06071 au 
 T_jup = 3.279 
[ 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 15.0   n/a MPO453282  
diameter diameter 3.809 km 0.897 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)  
geometric albedo albedo 0.134   0.099 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)  

85191 (1991 RP4)          Discovered 1991-Sep-07 by Ueda, S., Kaneda, H. at Kushiro
Reference: 20040830/Numbers.arcLast Updated: 2004-09-06

[ show close-approach data ]
Alternate Designations
 1991 RP4 = 2000 OU38 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin