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435 Ella (A898 RA)
Classification: Main-belt Asteroid          SPK-ID: 2000435
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 77 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1557347648728067 3.4761e-08  
a 2.449505757721804 5.4109e-09 au
q 2.068032554488413 8.5992e-08 au
i 1.816442451155847 3.7281e-06 deg
node 23.17476931120438 9.0687e-05 deg
peri 333.413957621077 9.1251e-05 deg
M 265.7221279595519 1.1531e-05 deg
tp 2459367.210541561443
4.4973e-05 TDB
period 1400.283991406601
n .257090706034835 8.5186e-10 deg/d
Q 2.830978960955195 6.2535e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3459  
   data-arc span      44474 days (121.76 yr)  
   first obs. used      1898-09-11  
   last obs. used      2020-06-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43818  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:14:02  

Additional Information
 Earth MOID = 1.06394 au 
 Jupiter MOID = 2.60728 au 
 T_jup = 3.479 
[ 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 10.4   n/a MPO473767 IRAS observations used: 6
diameter diameter 34.792 km 0.575 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 4.623 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Barucci, M.A.; Di Martino, M.; Fulchignoni, M. (1992) Astron. J. 103, 1679-1686.]
[Piironen, J.; Lagerkvist, C.-I.; Erikson, A.; Oja, T.; et al. (1998) Astron. Astrophys. Suppl. Ser. 128, 525-540.]
[Behrend, R. (2006) Observatoire de Geneve web site,]
[Chang, C.-K.; Lin, H.-W.; Ip, W.-H.; Prince, T.A.; et al. (2016) Astrophys. J. Sup. Ser. 227, A20.]
[Lang, K.; Jacobsen, J.; Kristensen, L.H.; Larsen, F.R. (2018) Minor Planet Bull. 45, 197-198.]
geometric albedo albedo 0.118   0.017 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
B-V BV 0.709   0.028 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=7.29, mean=7.98, max.=8.56) deg.
U-B UB 0.280   0.082 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=7.29, mean=7.98, max.=8.56) deg.
Tholen spectral type spec_T DCX   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices

435 Ella (A898 RA)          Discovered 1898-Sep-11 by Wolf, M. and Schwassmann, A. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
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
2063-May-06 19:03 < 00:01 Hebe 0.047877390189097 0.0478749929424083 0.0478797875363513 6.07305822208857 6.07305820070799 2474681.293664015 0.212069439665399 162.901641569666 18.340524397083 -43.1488474247324 268916.849212472 T 77 CATAB v2.0f-lin.ifort 2020-Jun-23 15:14:16 2020-Jun-23 15:14

Alternate Designations
 A898 RA = 1947 KE 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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