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
JPL Small-Body Database Browser
Search: [ help ]  
20742 (1999 XJ261)
Classification: Main-belt Asteroid          SPK-ID: 2020742
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03845552488278881 3.9979e-08  
a 2.711951468882118 1.5944e-08 au
q 2.607661951689606 1.0879e-07 au
i 22.38803649046995 4.7759e-06 deg
node 131.6339083360771 1.0172e-05 deg
peri 332.1998332549985 5.7274e-05 deg
M 223.563192566998 5.7217e-05 deg
tp 2459818.730383149515
(2022-Aug-27.23038315)
0.00026082 TDB
period 1631.252901040768
4.47
1.4385e-05
3.938e-08
d
yr
n .2206892626951429 1.9462e-09 deg/d
Q 2.81624098607463 1.6557e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1526  
   data-arc span      12374 days (33.88 yr)  
   first obs. used      1986-12-30  
   last obs. used      2020-11-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .47589  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:29:50  

Additional Information
 Earth MOID = 1.6311 au 
 Jupiter MOID = 2.25658 au 
 T_jup = 3.253 
[ 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 13.88   n/a E2021B10  
diameter diameter 4.513 km 0.044 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.315   0.037 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20742 (1999 XJ261)          Discovered 1999-Dec-14 by CSS at Catalina
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 XJ261 = 1986 YF 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Apr-18 22:22 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin