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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1969606571425402 3.6215e-08  
a 3.198458503410937 1.2752e-08 au
q 2.568488014735973 1.1623e-07 au
i 21.30998127470416 4.8273e-06 deg
node 292.0130784946193 1.1431e-05 deg
peri 81.62147382432568 1.6703e-05 deg
M 71.17140849864437 1.1358e-05 deg
tp 2458587.440545008794
(2019-Apr-13.94054501)
6.5743e-05 TDB
period 2089.341871036128
5.72
1.2495e-05
3.421e-08
d
yr
n .1723030610694036 1.0305e-09 deg/d
Q 3.828428992085901 1.5264e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2588  
   data-arc span      44238 days (121.12 yr)  
   first obs. used      1899-10-04  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .36654  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 01:53:44  

Additional Information
 Earth MOID = 1.67022 au 
 Jupiter MOID = 2.00617 au 
 T_jup = 3.059 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456176.5 (2012-Sep-06.0) TDB
Reference: JPL 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1919327930067966 3.5793e-08  
q 2.584966068567554 1.1401e-07 au
tp 2456490.011171492436
(2013-Jul-16.51117149)
6.9589e-05 TDB
node 292.3510529066162 1.1374e-05 deg
peri 80.33324307136861 1.7167e-05 deg
i 21.37454456440187 4.8308e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2588  
   data-arc span      44238 days (121.12 yr)  
   first obs. used      1899-10-04  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .36654  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 01:53:44  

Additional Information
 Jupiter MOID = 2.00617 au 
 T_jup = 3.059 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.281134801116472E-15 -4.064906039381697E-15 -2.917414415111501E-13 -1.472244852887656E-15 -7.248342250892991E-14 -8.080586839773117E-16
q -4.064906039381697E-15 1.299801405743518E-14 9.122990448625607E-13 5.533523259245592E-15 2.205499545174771E-13 3.607137500197016E-15
tp -2.917414415111501E-13 9.122990448625607E-13 4.842591982509117E-9 -1.653322963572465E-11 9.168772615597331E-10 -5.084905558644019E-12
node -1.472244852887656E-15 5.533523259245592E-15 -1.653322963572465E-11 1.293566165897127E-10 -1.228176582866323E-10 5.213504666282838E-12
peri -7.248342250892991E-14 2.205499545174771E-13 9.168772615597331E-10 -1.228176582866323E-10 2.947049360335216E-10 -5.637231425876905E-12
i -8.080586839773117E-16 3.607137500197016E-15 -5.084905558644019E-12 5.213504666282838E-12 -5.637231425876905E-12 2.333680175962094E-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 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. 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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