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3181 Ahnert (1964 EC)
Classification: Main-belt Asteroid          SPK-ID: 2003181
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06526315209659828 4.0835e-08  
a 2.229237844595392 6.5564e-09 au
q 2.08375075608407 9.3259e-08 au
i 3.958089047900956 3.9386e-06 deg
node 221.133204545695 4.9337e-05 deg
peri 304.3246856281056 5.5539e-05 deg
M 306.266760482934 2.6624e-05 deg
tp 2459181.956931044984
(2020-Nov-28.45693104)
9.0116e-05 TDB
period 1215.718534063943
3.33
5.3633e-06
1.468e-08
d
yr
n .2961211743614539 1.3064e-09 deg/d
Q 2.374724933106714 6.9843e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2412  
   data-arc span      32544 days (89.10 yr)  
   first obs. used      1931-03-23  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44444  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 01:50:17  

Additional Information
 Earth MOID = 1.09297 au 
 Jupiter MOID = 2.60044 au 
 T_jup = 3.637 
[ 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 12.6   n/a MPO347546  
diameter diameter 7.961 km 0.097 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
geometric albedo albedo 0.216   0.019 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
SMASSII spectral type spec_B S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

3181 Ahnert (1964 EC)          Discovered 1964-Mar-08 by Borngen, F. at Tautenburg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1964 EC = 1932 RK = 1936 XJ = 1951 GC1 = 1964 DE = 1975 NH1 = 1975 RD = 1979 SC12 = 1979 UO4 = 1979 WD8 = 1979 WU1 = 1982 RE1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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