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 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04598290372984654 4.1032e-08  
a 2.445705447825898 1.5984e-08 AU
q 2.333244809666959 9.8094e-08 AU
i 3.886313896507678 6.5553e-06 deg
node 157.8152576094562 6.8374e-05 deg
peri 108.2750159769216 0.00010733 deg
M 106.3233856905358 8.1418e-05 deg
tp 2456587.898359813572
(2013-Oct-22.39835981)
0.00031621 JED
period 1397.026529040786
3.82
1.3696e-05
3.75e-08
d
yr
n .2576901673064004 2.5263e-09 deg/d
Q 2.558166085984838 1.6719e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1077  
   data-arc span      8529 days (23.35 yr)  
   first obs. used      1991-09-13  
   last obs. used      2015-01-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .5139  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Feb-04 13:58:36  

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 2015-Feb-28 12:27 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin