Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Near-Earth Object (NEO) Program
Search JPL
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
21080 (1991 RD18)
Classification: Main-belt Asteroid          SPK-ID: 2021080
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 10 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04598290157569768 4.1412e-08  
a 2.445705449241768 1.6285e-08 AU
q 2.333244816286137 9.9497e-08 AU
i 3.886313840145687 6.6376e-06 deg
node 157.8152607771072 6.9052e-05 deg
peri 108.2750066883981 0.00010825 deg
M 106.3233910452954 8.1803e-05 deg
tp 2456587.898338675440
(2013-Oct-22.39833868)
0.00031778 JED
period 1397.026530253937
3.82
1.3953e-05
3.82e-08
d
yr
n .2576901670826272 2.5738e-09 deg/d
Q 2.558166082197399 1.7034e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1019  
   data-arc span      8443 days (23.12 yr)  
   first obs. used      1991-09-13  
   last obs. used      2014-10-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .52311  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Nov-10 13:37:51  

Additional Information
 Earth MOID = 1.32236 AU 
 T_jup = 3.494 
[ 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 14.2 mag n/a PDS3 (MPO 8636)  

21080 (1991 RD18)          Discovered 1991-Sep-13 by Holt, H. E. at Palomar (675)
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1991 RD18 = 1998 MO21 = 1999 UL14 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2014-Nov-21 12:07 UT
(server date/time)  
NASA Home Page
Site Manager:   Donald K. Yeomans
Webmaster  Alan B. Chamberlin