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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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Orbit Diagram
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Note: This Java-based orbit viewer will eventually be retired.

Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet 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. For accurate long-term ephemerides, please instead use our Horizons system.

Note: If the applet is not working, here are some notes that might help.
Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).


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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456032.5 (2012-Apr-15.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1919718271521266 3.6077e-08  
q 2.585274201529264 1.1513e-07 au
tp 2456489.837710967324
(2013-Jul-16.33771097)
7.0309e-05 TDB
node 292.3516819994219 1.1592e-05 deg
peri 80.2873085407753 1.7449e-05 deg
i 21.37257607180574 4.8399e-06 deg
  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
 Jupiter MOID = 2.00617 au 
 T_jup = 3.059 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.301541514961436E-15 -4.137229125193425E-15 -2.49844284496726E-13 -2.25584713049066E-15 -6.161564306275607E-14 -9.680112548557024E-16
q -4.137229125193425E-15 1.325399563526687E-14 7.639753864772355E-13 8.005086246561108E-15 1.824118598224402E-13 4.105883936144676E-15
tp -2.49844284496726E-13 7.639753864772355E-13 4.943398982758008E-9 -1.595184324885512E-11 9.400721980135546E-10 -5.723923260973572E-12
node -2.25584713049066E-15 8.005086246561108E-15 -1.595184324885512E-11 1.343754744653684E-10 -1.273812988627678E-10 4.62024865005245E-12
peri -6.161564306275607E-14 1.824118598224402E-13 9.400721980135546E-10 -1.273812988627678E-10 3.044684110712184E-10 -5.230773049179963E-12
i -9.680112548557024E-16 4.105883936144676E-15 -5.723923260973572E-12 4.62024865005245E-12 -5.230773049179963E-12 2.342479550084198E-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. 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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1995-Nov-29 03:46 00:01 Inter 0.0385633200900273 0.0385621739401401 0.0385644662478233 1.98381793835275 1.98381774699657 2450050.656844876 1.26421126510737 66.5822205972449 34.4970642517142 -37.2686427233533 122080.851440609 T 39 CATAB v2.0f-lin.ifort 2020-May-20 01:06:06 2020-May-20 01:06
2172-Jul-26 21:21 00:07 Inter 0.0494995788525279 0.0494952155736107 0.0495039442036857 2.02115551693365 2.021155370609 2514574.389880433 6.86355400970912 556.189505368379 39.726255371287 67.3709266030788 171543.6441798 T 39 CATAB v2.0f-lin.ifort 2020-May-20 01:06:06 2020-May-20 01:06

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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