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939 Isberga (A920 TD)
Classification: Main-belt Asteroid          SPK-ID: 2000939
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1771979702502012 2.0309e-08  
a 2.247251298863244 4.4403e-09 au
q 1.849042930062549 4.5874e-08 au
i 2.584108491466071 1.4012e-06 deg
node 327.0537804407644 2.2015e-05 deg
peri 6.156337082407901 2.3082e-05 deg
M 354.5152417584752 4.9183e-06 deg
tp 2459415.246960989634
(2021-Jul-19.74696099)
1.6843e-05 TDB
period 1230.48376228736
3.37
3.6469e-06
9.985e-09
d
yr
n .2925678591083494 8.6712e-10 deg/d
Q 2.645459667663939 5.2271e-09 au
  Orbit Determination Parameters
   # obs. used (total)      4044  
   data-arc span      36833 days (100.84 yr)  
   first obs. used      1920-10-04  
   last obs. used      2021-08-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .35979  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 07:10:16  

Additional Information
 Earth MOID = .837999 au 
 Jupiter MOID = 2.7082 au 
 T_jup = 3.608 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456584.5 (2013-Oct-19.0) TDB
Reference: JPL 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1775577231520732 2.0401e-08  
q 1.84757575148682 4.6079e-08 au
tp 2456954.134560664650
(2014-Oct-23.63456066)
1.3987e-05 TDB
node 327.1416708845648 2.1985e-05 deg
peri 5.970207900453506 2.3049e-05 deg
i 2.587724641220223 1.4019e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      4044  
   data-arc span      36833 days (100.84 yr)  
   first obs. used      1920-10-04  
   last obs. used      2021-08-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .35979  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 07:10:16  

Additional Information
 Jupiter MOID = 2.7082 au 
 T_jup = 3.608 
Orbit Covariance (6×6)
  e q tp node peri i
e 4.161905651006972E-16 -9.371088894643843E-16 -2.064819418794698E-13 1.328303508409178E-13 -2.044918724996423E-13 -9.113108934330143E-15
q -9.371088894643843E-16 2.12327097038912E-15 4.726731236186599E-13 -2.974223524476952E-13 4.612045397676253E-13 2.075834560645066E-14
tp -2.064819418794698E-13 4.726731236186599E-13 1.956223560054657E-10 -1.459713402321835E-11 7.758603378508949E-11 1.616298645202208E-12
node 1.328303508409178E-13 -2.974223524476952E-13 -1.459713402321835E-11 4.833612671402102E-10 -4.966588370577122E-10 -1.370858955912499E-11
peri -2.044918724996423E-13 4.612045397676253E-13 7.758603378508949E-11 -4.966588370577122E-10 5.312740105549706E-10 1.404660314904685E-11
i -9.113108934330143E-15 2.075834560645066E-14 1.616298645202208E-12 -1.370858955912499E-11 1.404660314904685E-11 1.965419819513687E-12

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.06   n/a MPO636075  
diameter diameter 10.390 km 0.181 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 2.9173 h n/a LCDB (Rev. 2020-October); 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, http://obswww.unige.ch/~behrend/page_cou.html]
[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] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
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

Alternate Designations
 A920 TD = 1930 QP = 1957 QE = 1957 UU 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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