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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 76 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1557347681033697 3.6543e-08  
a 2.449505758023582 5.5128e-09 au
q 2.068032546829911 9.0049e-08 au
i 1.816443728590311 3.8461e-06 deg
node 23.17473992581803 9.3204e-05 deg
peri 333.4139869714265 9.3745e-05 deg
M 265.722127617429 1.1604e-05 deg
tp 2459367.210542959959
(2021-Jun-01.71054296)
4.5283e-05 TDB
period 1400.283991665374
3.83
4.7272e-06
1.294e-08
d
yr
n .2570907059873247 8.6791e-10 deg/d
Q 2.830978969217254 6.3714e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3345  
   data-arc span      44424 days (121.63 yr)  
   first obs. used      1898-09-11  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44397  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 01:05:36  

Additional Information
 Earth MOID = 1.06394 au 
 Jupiter MOID = 2.60728 au 
 T_jup = 3.479 
[ hide covariance matrix ]
Orbital Elements at Epoch 2455468.5 (2010-Sep-29.0) TDB
Reference: JPL 76 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1547525547164356 3.6291e-08  
q 2.070095479310178 8.9171e-08 au
tp 2455163.749434019070
(2009-Nov-28.24943402)
4.6077e-05 TDB
node 23.26028653181399 9.3216e-05 deg
peri 332.8928594912346 9.3774e-05 deg
i 1.817208300691022 3.8427e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3345  
   data-arc span      44424 days (121.63 yr)  
   first obs. used      1898-09-11  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44397  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 01:05:36  

Additional Information
 Jupiter MOID = 2.60728 au 
 T_jup = 3.479 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.317024580865207E-15 -3.231576050087879E-15 3.659315334817986E-13 9.25491631193047E-15 6.584502454186095E-14 2.386252381403011E-16
q -3.231576050087879E-15 7.951483361892696E-15 -9.308823816583402E-13 -2.345790796425349E-14 -1.676036280518699E-13 -5.625982979465334E-16
tp 3.659315334817986E-13 -9.308823816583402E-13 2.123074611618336E-9 4.723299228715319E-12 4.787833972006769E-10 -1.562821811693166E-13
node 9.25491631193047E-15 -2.345790796425349E-14 4.723299228715319E-12 8.689235250760764E-9 -8.683499941461498E-9 -8.431318027482924E-11
peri 6.584502454186095E-14 -1.676036280518699E-13 4.787833972006769E-10 -8.683499941461498E-9 8.793482321927011E-9 8.423180345267285E-11
i 2.386252381403011E-16 -5.625982979465334E-16 -1.562821811693166E-13 -8.431318027482924E-11 8.423180345267285E-11 1.476605847006347E-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 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] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
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, http://obswww.unige.ch/~behrend/page_cou.html]
[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] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
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
(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
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 76 CATAB v2.0f-lin.ifort 2020-May-20 01:05:46 2020-May-20 01:05

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