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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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1969606574278449 3.6519e-08  
a 3.198458503266145 1.2951e-08 au
q 2.568488013707164 1.1745e-07 au
i 21.30998134197209 4.8369e-06 deg
node 292.013077830923 1.1649e-05 deg
peri 81.62147455455273 1.6973e-05 deg
M 71.17140845980501 1.1419e-05 deg
tp 2458587.440545262255
(2019-Apr-13.94054526)		 6.6138e-05 TDB
period 2089.341870894253
5.72		 1.269e-05
3.474e-08		 d
yr
n .1723030610811037 1.0465e-09 deg/d
Q 3.828428992825125 1.5501e-08 au
   Orbit Determination Parameters
   # obs. used (total)      2465  
   data-arc span      44033 days (120.56 yr)  
   first obs. used      1899-10-04  
   last obs. used      2020-04-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .37352  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 01:05:53  

Additional Information
 Earth MOID = 1.67022 au 
 Jupiter MOID = 2.00617 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 9.2   n/a MPO502157 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. 2019-August); 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.]
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

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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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