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789 Lena (A914 MA)
Classification: Main-belt Asteroid          SPK-ID: 2000789
[ 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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1479763443778227 1.1744e-08  
a 2.685072981906266 7.4368e-09 au
q 2.287745697656117 3.1046e-08 au
i 10.77727722963622 8.5184e-07 deg
node 232.5847710765557 3.4359e-06 deg
peri 43.66686476819227 9.2112e-06 deg
M 63.88320512836323 6.6167e-06 deg
tp 2458915.321509900407
(2020-Mar-06.82150990)		 2.9501e-05 TDB
period 1607.061765757775
4.40		 6.6766e-06
1.828e-08		 d
yr
n .2240113029073589 9.3066e-10 deg/d
Q 3.082400266156416 8.5373e-09 au
   Orbit Determination Parameters
   # obs. used (total)      3174  
   data-arc span      31393 days (85.95 yr)  
   first obs. used      1935-03-02  
   last obs. used      2021-02-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .39432  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 11:26:34  

Additional Information
 Earth MOID = 1.28337 au 
 Jupiter MOID = 2.03646 au 
 T_jup = 3.334 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457056.5 (2015-Feb-03.0) TDB
Reference: JPL 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1468300995536131 1.175e-08  
q 2.291110473690734 3.1019e-08 au
tp 2457309.002080174384
(2015-Oct-13.50208017)		 3.0611e-05 TDB
node 232.6358032379502 3.4334e-06 deg
peri 43.9962993075145 9.2806e-06 deg
i 10.78039360881963 8.5227e-07 deg
   Orbit Determination Parameters
   # obs. used (total)      3174  
   data-arc span      31393 days (85.95 yr)  
   first obs. used      1935-03-02  
   last obs. used      2021-02-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .39432  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 11:26:34  

Additional Information
 Jupiter MOID = 2.03646 au 
 T_jup = 3.334 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.38071303952731E-16 -3.570732918750053E-16 -3.529941137274503E-14 -6.303833983194998E-15 2.759122686702269E-15 -3.553484038128582E-15
q -3.570732918750053E-16 9.621822168512433E-16 5.212797136582072E-14 1.728865380892177E-14 -1.984753706704279E-14 9.821097048460095E-15
tp -3.529941137274503E-14 5.212797136582072E-14 9.370147644574292E-10 -3.908323126907173E-13 2.597876801170266E-10 -3.925704178771467E-12
node -6.303833983194998E-15 1.728865380892177E-14 -3.908323126907173E-13 1.178813838750185E-11 -1.260262645205166E-11 1.378668757008234E-12
peri 2.759122686702269E-15 -1.984753706704279E-14 2.597876801170266E-10 -1.260262645205166E-11 8.612966126620524E-11 -2.666766083372171E-12
i -3.553484038128582E-15 9.821097048460095E-15 -3.925704178771467E-12 1.378668757008234E-12 -2.666766083372171E-12 7.263640697790418E-13

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 11.33   n/a E2021B10  
diameter diameter 22.483 km 0.306 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 5.848 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Behrend, R. (2007) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Shipley, H.; Dillard, A.; Kendall, J.; Reichert, M.; et al. (2008) Minor Planet Bull. 35, 99-101.]
[Durech, J.; Hanus, J.; Oszkiewsicz, D.; Vanco, R. (2016) Astron. Astrophys. 587, A48.]
[Hanus, J.; Delbo, M.; Durech, J.; Ali-Lagoa, V. (2018) Icarus 309, 297-337.]
[Behrend, R. (2020) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.153   0.028 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
SMASSII spectral type spec_B X   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

789 Lena (A914 MA)          Discovered 1914-Jun-24 by Neujmin, G. at Simeis
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A914 MA = 1970 CE 
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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