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 ]  
91559 (1999 RM226)
Classification: Main-belt Asteroid          SPK-ID: 2091559
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1271805657118359 6.092e-08  
a 2.800159344111155 2.113e-08 au
q 2.444033494643815 1.7306e-07 au
i 8.636783261748795 7.9277e-06 deg
node 350.626511104842 3.7764e-05 deg
peri 70.94862543231096 4.7875e-05 deg
M 93.13105872992941 2.7716e-05 deg
tp 2458557.743867888778
(2019-Mar-15.24386789)
0.0001312 TDB
period 1711.482825748403
4.69
1.9372e-05
5.304e-08
d
yr
n .2103439161550325 2.3808e-09 deg/d
Q 3.156285193578495 2.3817e-08 au
  Orbit Determination Parameters
   # obs. used (total)      402  
   data-arc span      9827 days (26.90 yr)  
   first obs. used      1992-02-29  
   last obs. used      2019-01-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .61264  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-13 06:24:11  

Additional Information
 Earth MOID = 1.47274 au 
 Jupiter MOID = 2.20562 au 
 T_jup = 3.297 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.5   n/a MPO459428  
diameter diameter 2.178 km 0.331 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.214   0.107 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

91559 (1999 RM226)          Discovered 1999-Sep-04 by Spacewatch at Kitt Peak
Reference: 20041028/Numbers.arcLast Updated: 2004-10-29

Alternate Designations
 1999 RM226 = 1999 SX21 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Feb-20 04:43 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin