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 ]  
4811 Semashko (1973 SO3)
Classification: Main-belt Asteroid          SPK-ID: 2004811
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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1831360459051735 3.0371e-08  
a 2.246780961572678 7.7629e-09 au
q 1.835314380255235 6.9791e-08 au
i 5.058551421110435 4.86e-06 deg
node 8.982889417086138 3.714e-05 deg
peri 275.2884773739775 4.0666e-05 deg
M 8.586016284811015 1.9539e-05 deg
tp 2458971.162119402651
(2020-May-01.66211940)
6.6703e-05 TDB
period 1230.097482313123
3.37
6.3752e-06
1.745e-08
d
yr
n .2926597324002663 1.5168e-09 deg/d
Q 2.658247542890122 9.1846e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2000  
   data-arc span      23778 days (65.10 yr)  
   first obs. used      1955-03-23  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48561  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 02:12:48  

Additional Information
 Earth MOID = .827622 au 
 Jupiter MOID = 2.51107 au 
 T_jup = 3.603 
[ 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 14.0   n/a MPO384797  
diameter diameter 3.767 km 0.091 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
geometric albedo albedo 0.247   0.030 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

4811 Semashko (1973 SO3)          Discovered 1973-Sep-25 by Zhuravleva, L. V. at Nauchnyj
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1973 SO3 = 1979 FK3 = 1983 RS1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-May-30 19:40 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin