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 ]  
20961 Arkesilaos (1973 SS1)
Classification: Jupiter Trojan          SPK-ID: 2020961
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .01757996326043356 5.2774e-08  
a 5.139527011989077 1.1252e-07 au
q 5.049174315942303 3.3639e-07 au
i 9.205574320788806 6.5279e-06 deg
node 27.87695979113433 3.7319e-05 deg
peri 47.46799997347603 0.00022012 deg
M 247.5839349509438 0.00021973 deg
tp 2459929.451203916427
(2022-Dec-15.95120392)
0.0026147 TDB
period 4255.819069998042
11.65
0.00013976
3.826e-07
d
yr
n .08459006223687174 2.778e-09 deg/d
Q 5.229879708035851 1.145e-07 au
  Orbit Determination Parameters
   # obs. used (total)      807  
   data-arc span      16864 days (46.17 yr)  
   first obs. used      1973-09-19  
   last obs. used      2019-11-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56644  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-14 00:48:03  

Additional Information
 Earth MOID = 4.06908 au 
 Jupiter MOID = .128676 au 
 T_jup = 2.974 
[ 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 11.9   n/a MPO279732  

20961 Arkesilaos           Discovered 1973 Sept. 19 by C. J. van Houten and I. van Houten-Groeneveld on Palomar Schmidt plates taken by T. Gehrels.
Arkesilaos, who was from Boeotia, was one of the first heroes to join the Greek army.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20010705/MPCPages.arcLast Updated: 2009-05-11

Alternate Designations
 1973 SS1 = 1996 RQ28 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Jan-24 01:58 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin