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 ]  
2329 Orthos (1976 WA)
Classification: Apollo [NEO]          SPK-ID: 2002329
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ hide orbit diagram ]

For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


[ revert to old Java-based viewer ]

Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 268 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .6537649250469325 2.9337e-08  
a 2.409753361616746 6.9889e-09 au
q .8343411357777805 7.0545e-08 au
i 24.4590135626512 5.8515e-06 deg
node 169.2895085224029 1.0191e-05 deg
peri 146.0147303425553 1.0833e-05 deg
M 158.9746088170803 4.0008e-06 deg
tp 2457997.131569430068
(2017-Aug-31.63156943)
1.4244e-05 TDB
period 1366.335395453656
3.74
5.9441e-06
1.627e-08
d
yr
n .2634784996406183 1.1462e-09 deg/d
Q 3.985165587455712 1.1558e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1391  
   data-arc span      15566 days (42.62 yr)  
   first obs. used      1976-05-31  
   last obs. used      2019-01-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43508  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jan-26 10:00:03  

Additional Information
 Earth MOID = .0943128 au 
 Jupiter MOID = 1.71461 au 
 T_jup = 3.097 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.5   n/a MPO435719  
rotation period rot_per 4.6473 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Published Reference List:
[Warner, B.D. (2017) Minor Planet Bull. 44, 335-344.]
[Carbognani, A.; Bacci, P.; Buzzi, L. (2018) Minor Planet Bull. 45, 6-10.]

2329 Orthos           Discovered 1976 Nov. 19 by H.-E. Schuster at the European Southern Observatory.
Named for Orthos, the two-headed dog from Greek mythology. Together with his master Eurytion, this dog looked after the cattle of Geryones. One of the twelve labors of Heracles was to steal these cattle.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC 5688Last Updated: 2006-03-21

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2019-Dec-13 23:57 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin