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 ]  
11640 (1997 AT4)
Classification: Main-belt Asteroid          SPK-ID: 2011640
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 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1227478124613365 4.1482e-08  
a 2.38909484313918 9.0953e-09 au
q 2.095838677381186 9.7609e-08 au
i 5.142843147313862 3.7368e-06 deg
node 299.4520323419241 4.4827e-05 deg
peri 88.23686657459514 4.7521e-05 deg
M 200.561196099008 1.7443e-05 deg
tp 2459597.865366764031
(2022-Jan-18.36536676)
6.7024e-05 TDB
period 1348.802968746512
3.69
7.7024e-06
2.109e-08
d
yr
n .2669033271290618 1.5242e-09 deg/d
Q 2.682351008897175 1.0212e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1456  
   data-arc span      11015 days (30.16 yr)  
   first obs. used      1990-03-02  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5212  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 03:34:58  

Additional Information
 Earth MOID = 1.10787 au 
 Jupiter MOID = 2.7555 au 
 T_jup = 3.518 
[ 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 14.5   n/a MPO319231  
diameter diameter 3.389 km 0.122 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.222   0.020 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

11640 (1997 AT4)          Discovered 1997-Jan-06 by Kobayashi, T. at Oizumi
Reference: 19990928/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1997 AT4 = 1990 EJ3 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-May-30 16:28 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin