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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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 73 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1557370980868938 3.8789e-08  
a 2.448988548113453 6.2205e-09 au
q 2.067590178382229 9.5085e-08 au
i 1.816627809425122 3.9425e-06 deg
node 23.17922774843889 9.7693e-05 deg
peri 333.5414234888295 9.8221e-05 deg
M 162.7003316586218 1.1703e-05 deg
tp 2457967.848567449789
(2017-Aug-02.34856745)
4.5349e-05 TDB
period 1399.840512900435
3.83
5.3335e-06
1.46e-08
d
yr
n .2571721540292393 9.7984e-10 deg/d
Q 2.830386917844678 7.1893e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3138  
   data-arc span      44070 days (120.66 yr)  
   first obs. used      1898-09-11  
   last obs. used      2019-05-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44892  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-29 19:07:27  

Additional Information
 Earth MOID = 1.06264 au 
 Jupiter MOID = 2.60465 au 
 T_jup = 3.479 
[ hide covariance matrix ]
Orbital Elements at Epoch 2455209.5 (2010-Jan-13.0) TDB
Reference: JPL 73 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1549778901436317 3.853e-08  
q 2.069973451976836 9.4357e-08 au
tp 2455163.806732669617
(2009-Nov-28.30673267)
4.6586e-05 TDB
node 23.26076610707912 9.7714e-05 deg
peri 332.9051638536037 9.8258e-05 deg
i 1.81719601795874 3.9384e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3138  
   data-arc span      44070 days (120.66 yr)  
   first obs. used      1898-09-11  
   last obs. used      2019-05-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44892  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-29 19:07:27  

Additional Information
 Jupiter MOID = 2.60465 au 
 T_jup = 3.479 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.484597804806599E-15 -3.630104270275876E-15 3.866704798721448E-13 9.908864810701452E-15 6.262057031069067E-14 2.683661207706362E-16
q -3.630104270275876E-15 8.903260386237176E-15 -9.839010427831663E-13 -2.493721609121266E-14 -1.61137146323023E-13 -6.340788657334381E-16
tp 3.866704798721448E-13 -9.839010427831663E-13 2.170279993485856E-9 4.074016280332981E-12 4.899843444151891E-10 -1.518084476635183E-13
node 9.908864810701452E-15 -2.493721609121266E-14 4.074016280332981E-12 9.54812180437801E-9 -9.542097443961195E-9 -1.042532081959545E-10
peri 6.262057031069067E-14 -1.61137146323023E-13 4.899843444151891E-10 -9.542097443961195E-9 9.654544200942054E-9 1.041610827932155E-10
i 2.683661207706362E-16 -6.340788657334381E-16 -1.518084476635183E-13 -1.042532081959545E-10 1.041610827932155E-10 1.551084055537023E-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 10.23   n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 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-January); 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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Alternate Designations
 A898 RA = 1947 KE 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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