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

Significant website upgrade scheduled for September 27. More details available here.

JPL Small-Body Database Browser
Search: [ help ]  
21865 (1999 TD246)
Classification: Main-belt Asteroid          SPK-ID: 2021865
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 47 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1254878619606687 2.0965e-08  
a 2.588075765167204 1.0155e-08 au
q 2.26330367080415 5.5473e-08 au
i 13.46551749895515 8.6524e-07 deg
node 192.6666124258617 4.2256e-06 deg
peri 33.07054215580985 6.4912e-06 deg
M 253.941052804687 6.7437e-06 deg
tp 2459844.531672927505
(2022-Sep-22.03167293)
3.0495e-05 TDB
period 1520.771292938404
4.16
8.9511e-06
2.451e-08
d
yr
n .2367219855290766 1.3933e-09 deg/d
Q 2.912847859530258 1.143e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2580  
   data-arc span      11133 days (30.48 yr)  
   first obs. used      1990-10-11  
   last obs. used      2021-04-04  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44605  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 18:37:16  

Additional Information
 Earth MOID = 1.26806 au 
 Jupiter MOID = 2.07226 au 
 T_jup = 3.371 
[ 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 13.47   n/a MPCxxxxx  
diameter diameter 5.170 km 0.071 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.321   0.027 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

21865 (1999 TD246)          Discovered 1999-Oct-08 by CSS at Catalina
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 TD246 = 1990 TP16 = 1993 FV25 = 1997 HW4 = 1998 QB64 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Sep-20 13:03 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin