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
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 ]  
939 Isberga (A920 TD)
Classification: Main-belt Asteroid          SPK-ID: 2000939
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 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1766714947802749 3.2929e-08  
a 2.247053634076378 5.6015e-09 au
q 1.850063309692655 7.3782e-08 au
i 2.583676832391877 3.6096e-06 deg
node 327.0541755552883 7.754e-05 deg
peri 6.27168785098527 7.8251e-05 deg
M 121.4422375244421 1.2516e-05 deg
tp 2458185.463927901490
4.2081e-05 TDB
period 1230.32141865298
n .2926064640849274 1.0941e-09 deg/d
Q 2.6440439584601 6.5911e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3383  
   data-arc span      36223 days (99.17 yr)  
   first obs. used      1920-10-04  
   last obs. used      2019-12-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .38284  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-13 20:50:38  

Additional Information
 Earth MOID = .838899 au 
 Jupiter MOID = 2.70754 au 
 T_jup = 3.608 
[ 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 12.0   n/a MPO502162  
diameter diameter 10.390 km 0.181 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 2.9173 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Published Reference List:
[Molnar, L.A.; Haegert, M.J.; Beaumonts, C.N.; Block, M.J.; et al. (2008) Minor Planet Bull. 35, 9-12.]
[Behrend, R. (2011) Observatoire de Geneve web site,]
[Carry, B.; Matter, A.; Scheirich, P.; Pravec, P.; et al. (2015) Icarus 248, 516-525.]
[Klinglesmith III, D.K. (2017) Minor Planet Bull. 44, 345-348.]
geometric albedo albedo 0.228   0.055 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
B-V BV 0.930   0.020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=7.58 deg.
U-B UB 0.540   0.020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=7.58 deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices

939 Isberga (A920 TD)          Discovered 1920-Oct-04 by Reinmuth, K. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A920 TD = 1930 QP = 1957 QE = 1957 UU 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
FirstGov 2020-Jan-23 05:06 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin