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JPL Small-Body Database Browser
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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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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 75 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1557347728945539 3.8161e-08  
a 2.449505758536465 5.6146e-09 au
q 2.068032535526886 9.3736e-08 au
i 1.816444662395091 3.9165e-06 deg
node 23.17470885992692 9.5767e-05 deg
peri 333.4140182300496 9.6292e-05 deg
M 265.7221268745413 1.1661e-05 deg
tp 2459367.210545964726
4.5529e-05 TDB
period 1400.283992105165
n .2570907059065795 8.8393e-10 deg/d
Q 2.830978981546043 6.489e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3240  
   data-arc span      44338 days (121.39 yr)  
   first obs. used      1898-09-11  
   last obs. used      2020-02-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44886  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:27:12  

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 75 CATAB v2.0f-lin.ifort 2020-Feb-22 15:27:23 2020-Feb-22 15:27

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