Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
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 ]

[ hide orbit diagram ]

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.


[ revert to old Java-based viewer ]

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
(2021-Jun-01.71054156)
4.4973e-05 TDB
period 1400.283991406601
3.83
4.6398e-06
1.27e-08
d
yr
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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2455561.5 (2010-Dec-31.0) TDB
Reference: JPL 77 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .154694917514653 3.4521e-08  
q 2.07041748947031 8.516e-08 au
tp 2455163.809383970425
(2009-Nov-28.30938397)
4.6031e-05 TDB
node 23.26185632555379 9.07e-05 deg
peri 332.9232655380782 9.1281e-05 deg
i 1.817214889504611 3.7248e-06 deg
  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
 Jupiter MOID = 2.60728 au 
 T_jup = 3.479 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.19171236647519E-15 -2.935566228607322E-15 3.401259977085898E-13 8.048836233403429E-15 6.634281164671443E-14 2.633208751782794E-16
q -2.935566228607322E-15 7.252231636063211E-15 -8.701030072132213E-13 -2.048916533436558E-14 -1.689007329694003E-13 -6.24700373222169E-16
tp 3.401259977085898E-13 -8.701030072132213E-13 2.11885327296545E-9 2.50519931569177E-12 4.810723609778267E-10 -6.244420422984323E-14
node 8.048836233403429E-15 -2.048916533436558E-14 2.50519931569177E-12 8.226472629193439E-9 -8.221479563232939E-9 -6.408407262448291E-11
peri 6.634281164671443E-14 -1.689007329694003E-13 4.810723609778267E-10 -8.221479563232939E-9 8.33224466858437E-9 6.403572835126045E-11
i 2.633208751782794E-16 -6.24700373222169E-16 -6.244420422984323E-14 -6.408407262448291E-11 6.403572835126045E-11 1.387384544859428E-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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Aug-12 10:47 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin