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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 78 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .155734764931899 3.4126e-08  
a 2.449505757733851 5.379e-09 au
q 2.068032554353837 8.4546e-08 au
i 1.816442453233997 3.666e-06 deg
node 23.17476916961558 8.989e-05 deg
peri 333.4139577540519 9.0464e-05 deg
M 265.7221279559424 1.1504e-05 deg
tp 2459367.210541578188
(2021-Jun-01.71054158)
4.4859e-05 TDB
period 1400.283991416932
3.83
4.6124e-06
1.263e-08
d
yr
n .2570907060329383 8.4684e-10 deg/d
Q 2.830978961113865 6.2167e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3548  
   data-arc span      44520 days (121.89 yr)  
   first obs. used      1898-09-11  
   last obs. used      2020-08-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43348  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:16:09  

Additional Information
 Earth MOID = 1.06394 au 
 Jupiter MOID = 2.60728 au 
 T_jup = 3.479 
[ hide covariance matrix ]
Orbital Elements at Epoch 2455612.5 (2011-Feb-20.0) TDB
Reference: JPL 78 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1546627540899926 3.389e-08  
q 2.070570333858022 8.373e-08 au
tp 2455163.821706164694
(2009-Nov-28.32170616)
4.6014e-05 TDB
node 23.26244823017944 8.9904e-05 deg
peri 332.9334367788538 9.0494e-05 deg
i 1.817212195522465 3.6626e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3548  
   data-arc span      44520 days (121.89 yr)  
   first obs. used      1898-09-11  
   last obs. used      2020-08-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43348  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:16:09  

Additional Information
 Jupiter MOID = 2.60728 au 
 T_jup = 3.479 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.148553877086691E-15 -2.833483166417072E-15 3.301126231257932E-13 7.297519020903037E-15 6.651837444887553E-14 2.945634954227624E-16
q -2.833483166417072E-15 7.010775760036943E-15 -8.464415992021556E-13 -1.867884317245519E-14 -1.693436234346902E-13 -6.997163703038525E-16
tp 3.301126231257932E-13 -8.464415992021556E-13 2.117253129595693E-9 1.276602275296417E-12 4.823251589905975E-10 4.700077160843994E-15
node 7.297519020903037E-15 -1.867884317245519E-14 1.276602275296417E-12 8.082704952141359E-9 -8.078051969163893E-9 -5.599322411475708E-11
peri 6.651837444887553E-14 -1.693436234346902E-13 4.823251589905975E-10 -8.078051969163893E-9 8.189184401414696E-9 5.596405204298277E-11
i 2.945634954227624E-16 -6.997163703038525E-16 4.700077160843994E-15 -5.599322411475708E-11 5.596405204298277E-11 1.341479004978163E-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

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