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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 ]

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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.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 84 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1552142884608333 1.6917e-08  
a 2.449547116528063 4.8451e-09 au
q 2.069342403784874 4.1735e-08 au
i 1.816435443859332 8.7958e-07 deg
node 23.13544768011919 4.3548e-05 deg
peri 333.232082276604 4.5537e-05 deg
M 7.66964642273111 9.8485e-06 deg
tp 2459366.666791364591
(2021-Jun-01.16679136)
3.8281e-05 TDB
period 1400.319456307177
3.83
4.1547e-06
1.137e-08
d
yr
n .2570841948803357 7.6276e-10 deg/d
Q 2.829751829271252 5.5972e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3744  
   data-arc span      44892 days (122.91 yr)  
   first obs. used      1898-09-11  
   last obs. used      2021-08-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42617  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 06:36:41  

Additional Information
 Earth MOID = 1.06436 au 
 Jupiter MOID = 2.60851 au 
 T_jup = 3.479 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 10.42   n/a E2021B10 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. 2020-October); 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.]
[Dose, E.V. (2020) Minor Planet Bull. 47, 324-330.]
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

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