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JPL Small-Body Database Browser
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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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1966320521326611 3.9656e-08  
a 3.197366070413263 1.3962e-08 au
q 2.568661418568561 1.2911e-07 au
i 21.30888160591912 5.0743e-06 deg
node 292.0164894366393 1.2517e-05 deg
peri 81.60115801210546 1.7615e-05 deg
M 2.270506196106864 1.1993e-05 deg
tp 2458587.329351464777
(2019-Apr-13.82935146)
6.9558e-05 TDB
period 2088.271540861841
5.72
1.3679e-05
3.745e-08
d
yr
n .1723913738973936 1.1292e-09 deg/d
Q 3.826070722257966 1.6708e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2148  
   data-arc span      43856 days (120.07 yr)  
   first obs. used      1899-10-04  
   last obs. used      2019-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39568  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 01:53:32  

Additional Information
 Earth MOID = 1.66959 au 
 Jupiter MOID = 2.00422 au 
 T_jup = 3.059 
[ hide covariance matrix ]
Orbital Elements at Epoch 2455760.5 (2011-Jul-18.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1919781156587798 3.9137e-08  
q 2.585978641337215 1.2665e-07 au
tp 2456489.485334065075
(2013-Jul-15.98533407)
7.2077e-05 TDB
node 292.3630179259462 1.2449e-05 deg
peri 80.1894516668805 1.8028e-05 deg
i 21.36817096236624 5.0778e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2148  
   data-arc span      43856 days (120.07 yr)  
   first obs. used      1899-10-04  
   last obs. used      2019-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39568  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 01:53:32  

Additional Information
 Jupiter MOID = 2.00422 au 
 T_jup = 3.059 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.531695154557472E-15 -4.938247216109192E-15 -4.848811725969588E-13 -1.731227592046585E-15 -8.555132820529854E-14 -2.03933988318276E-15
q -4.938247216109192E-15 1.604063957877706E-14 1.581242680513054E-12 6.588508570654364E-15 2.655389119602662E-13 7.788104698719096E-15
tp -4.848811725969588E-13 1.581242680513054E-12 5.19502501720391E-9 -1.719432500279485E-11 9.667791762884293E-10 -4.054537001941798E-12
node -1.731227592046585E-15 6.588508570654364E-15 -1.719432500279485E-11 1.549682059532726E-10 -1.466161952935231E-10 1.132401460861251E-11
peri -8.555132820529854E-14 2.655389119602662E-13 9.667791762884293E-10 -1.466161952935231E-10 3.249959872529323E-10 -1.121622631703114E-11
i -2.03933988318276E-15 7.788104698719096E-15 -4.054537001941798E-12 1.132401460861251E-11 -1.121622631703114E-11 2.578410894459214E-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 9.29   n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 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-January); 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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