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445 Edna (A899 TC)
Classification: Main-belt Asteroid          SPK-ID: 2000445
[ 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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 46 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1971058385788119 1.613e-08  
a 3.198585738841814 1.1672e-08 au
q 2.568125814521169 5.1348e-08 au
i 21.30932268065918 3.6679e-07 deg
node 292.0125609965833 1.0629e-06 deg
peri 81.63070752515019 4.883e-06 deg
M 105.6043083346156 7.4057e-06 deg
tp 2458587.564807855932
(2019-Apr-14.06480786)		 4.1244e-05 TDB
period 2089.4665440419
5.72		 1.1438e-05
3.132e-08		 d
yr
n .172292780196236 9.4311e-10 deg/d
Q 3.829045663162458 1.3973e-08 au
   Orbit Determination Parameters
   # obs. used (total)      2898  
   data-arc span      44357 days (121.44 yr)  
   first obs. used      1899-10-04  
   last obs. used      2021-03-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .35483  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 10:54:07  

Additional Information
 Earth MOID = 1.66854 au 
 Jupiter MOID = 2.00613 au 
 T_jup = 3.059 
[ 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 9.23   n/a E2021B10 IRAS observations used: 25
diameter diameter 87.812 km 0.433 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 19.959 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Malcolm, G. (2002) Minor Planet Bull. 29, 28-29.]
[Pilcher, F. (2019) Minor Planet Bull. 46, 58-60.]
[Polakis, T. (2020) Minor Planet Bull. 47, 177-186.]
geometric albedo albedo 0.044   0.006 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.684   0.036 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=18.87, mean=19.14, max.=19.41) deg.
U-B UB 0.368   0.032 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=18.87, mean=19.14, max.=19.41) deg.
Tholen spectral type spec_T C   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices

445 Edna (A899 TC)          Discovered 1899-Oct-02 by Coddington, E. F. at Mount Hamilton
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A899 TC = 1978 PJ5 = A918 CB 
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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