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400 Ducrosa (A895 EC)
Classification: Main-belt Asteroid          SPK-ID: 2000400
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 45 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1162922533653355 4.2354e-08  
a 3.125963686257175 1.4441e-08 au
q 2.762438325244117 1.3346e-07 au
i 10.52669869363427 4.4079e-06 deg
node 327.0328661733673 2.3025e-05 deg
peri 237.5765350497996 2.8961e-05 deg
M 184.7399827791543 2.0005e-05 deg
tp 2459983.276286999876
(2023-Feb-07.77628700)
0.00011534 TDB
period 2018.711791372996
5.53
1.3988e-05
3.83e-08
d
yr
n .1783315486333745 1.2357e-09 deg/d
Q 3.489489047270232 1.612e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2529  
   data-arc span      45899 days (125.66 yr)  
   first obs. used      1895-03-18  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42399  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 01:53:18  

Additional Information
 Earth MOID = 1.77779 au 
 Jupiter MOID = 1.59404 au 
 T_jup = 3.178 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456926.5 (2014-Sep-26.0) TDB
Reference: JPL 45 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1161521332102303 4.2286e-08  
q 2.763185753657879 1.3317e-07 au
tp 2455951.374824227255
(2012-Jan-24.87482423)
0.0001058 TDB
node 327.1449301962544 2.2985e-05 deg
peri 238.5387863938861 2.9018e-05 deg
i 10.53564264048777 4.4125e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2529  
   data-arc span      45899 days (125.66 yr)  
   first obs. used      1895-03-18  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42399  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 01:53:18  

Additional Information
 Jupiter MOID = 1.59404 au 
 T_jup = 3.178 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.788114293343023E-15 -5.605195469937549E-15 -1.077761398737519E-12 2.191054905798677E-16 -1.796910192183117E-13 1.279579018652848E-15
q -5.605195469937549E-15 1.773389270335317E-14 3.696854171635753E-12 7.25575976342771E-17 6.267031420415395E-13 -3.281498783029605E-15
tp -1.077761398737519E-12 3.696854171635753E-12 1.119433598920949E-8 1.528172740592337E-12 1.902811207524836E-9 1.812321007593734E-12
node 2.191054905798677E-16 7.25575976342771E-17 1.528172740592337E-12 5.283027599410861E-10 -5.184579028752988E-10 3.310139153058387E-11
peri -1.796910192183117E-13 6.267031420415395E-13 1.902811207524836E-9 -5.184579028752988E-10 8.420671492424145E-10 -3.215866543786097E-11
i 1.279579018652848E-15 -3.281498783029605E-15 1.812321007593734E-12 3.310139153058387E-11 -3.215866543786097E-11 1.946983618303305E-11

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 10.5   n/a MPO265957  
diameter diameter 36.001 km 0.390 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 6.8678 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Warner, B.D. (2005) Minor Planet Bull. 32, 54-58.]
[Hanus, J.; Durech, J.; Broz, M.; Warner, B.D.; et al. (2011) Astron. Astrophys. 530, A134.]
[Pilcher, F. (2020) Minor Planet Bull. 47, 34-36.]
geometric albedo albedo 0.112   0.022 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

400 Ducrosa (A895 EC)          Discovered 1895-Mar-15 by Charlois, A. at Nice
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A895 EC = 1939 BH = 1950 BC1 = 1950 BQ = 1950 CB 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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