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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1479762852410689 2.9715e-08  
a 2.685072980624919 7.6982e-09 au
q 2.287745855350879 7.9125e-08 au
i 10.77728406330256 3.2089e-06 deg
node 232.5847466415012 1.9874e-05 deg
peri 43.66687284369737 2.4136e-05 deg
M 63.88322229995583 1.2792e-05 deg
tp 2458915.321433449515
(2020-Mar-06.82143345)
5.7272e-05 TDB
period 1607.061764607412
4.40
6.9113e-06
1.892e-08
d
yr
n .2240113030677101 9.6338e-10 deg/d
Q 3.082400105898958 8.8374e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3090  
   data-arc span      31371 days (85.89 yr)  
   first obs. used      1935-03-02  
   last obs. used      2021-01-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39647  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 00:49:50  

Additional Information
 Earth MOID = 1.28337 au 
 Jupiter MOID = 2.03646 au 
 T_jup = 3.334 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457006.5 (2014-Dec-15.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1468189276806877 2.9734e-08  
q 2.291192777593737 7.9037e-08 au
tp 2457308.969488131782
(2015-Oct-13.46948813)
5.9283e-05 TDB
node 232.6365490172967 1.9858e-05 deg
peri 43.98395816555865 2.4173e-05 deg
i 10.78019636901027 3.2099e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3090  
   data-arc span      31371 days (85.89 yr)  
   first obs. used      1935-03-02  
   last obs. used      2021-01-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39647  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 00:49:50  

Additional Information
 Jupiter MOID = 2.03646 au 
 T_jup = 3.334 
Orbit Covariance (6×6)
  e q tp node peri i
e 8.841321887247863E-16 -2.342161151421596E-15 2.034938542307431E-13 4.84670159324561E-16 2.033126118730173E-14 -1.991541302011655E-15
q -2.342161151421596E-15 6.246899228682259E-15 -6.541565906463635E-13 -3.169731630348862E-15 -8.200123263837593E-14 5.743410900987515E-15
tp 2.034938542307431E-13 -6.541565906463635E-13 3.514420968960674E-9 1.11749790339725E-11 8.311455977727131E-10 -5.03910592130284E-12
node 4.84670159324561E-16 -3.169731630348862E-15 1.11749790339725E-11 3.943274579352065E-10 -3.847995508749692E-10 -9.412910977142528E-12
peri 2.033126118730173E-14 -8.200123263837593E-14 8.311455977727131E-10 -3.847995508749692E-10 5.843105342711821E-10 8.161639689379538E-12
i -1.991541302011655E-15 5.743410900987515E-15 -5.03910592130284E-12 -9.412910977142528E-12 8.161639689379538E-12 1.030320139866782E-11

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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