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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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1482449517347652 3.0044e-08  
a 2.686494864524938 7.8063e-09 au
q 2.288235562997744 8.0271e-08 au
i 10.77702358693848 3.2872e-06 deg
node 232.6067838731626 2.0026e-05 deg
peri 43.80773011945239 2.4253e-05 deg
M 18.94404895578868 1.2809e-05 deg
tp 2458915.865437114644
(2020-Mar-07.36543711)
5.7277e-05 TDB
period 1608.338466071056
4.40
7.0101e-06
1.919e-08
d
yr
n .2238334825625537 9.756e-10 deg/d
Q 3.084754166052132 8.9635e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2881  
   data-arc span      31291 days (85.67 yr)  
   first obs. used      1935-03-02  
   last obs. used      2020-11-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40282  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:25:47  

Additional Information
 Earth MOID = 1.28569 au 
 Jupiter MOID = 2.03595 au 
 T_jup = 3.333 
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Orbital Elements at Epoch 2456839.5 (2014-Jul-01.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1467156980268074 3.0064e-08  
q 2.29206319670263 7.9975e-08 au
tp 2457308.695803178297
(2015-Oct-13.19580318)
5.9439e-05 TDB
node 232.6478133080179 2.0014e-05 deg
peri 43.87009783288489 2.4323e-05 deg
i 10.7791351321587 3.2881e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2881  
   data-arc span      31291 days (85.67 yr)  
   first obs. used      1935-03-02  
   last obs. used      2020-11-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40282  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:25:47  

Additional Information
 Jupiter MOID = 2.03595 au 
 T_jup = 3.333 
Orbit Covariance (6×6)
  e q tp node peri i
e 9.038436213137213E-16 -2.396151513926573E-15 1.925528158847241E-13 1.131646325371804E-16 1.973066888132938E-14 -2.161199123063629E-15
q -2.396151513926573E-15 6.396039526518464E-15 -6.255873734630604E-13 -2.229254375596126E-15 -8.119136879181478E-14 6.099447788569606E-15
tp 1.925528158847241E-13 -6.255873734630604E-13 3.532957792053454E-9 1.000914116872279E-11 8.356374991389041E-10 -5.281393744934226E-12
node 1.131646325371804E-16 -2.229254375596126E-15 1.000914116872279E-11 4.005724407247666E-10 -3.912015984010689E-10 -7.705338147503201E-12
peri 1.973066888132938E-14 -8.119136879181478E-14 8.356374991389041E-10 -3.912015984010689E-10 5.915977966289443E-10 6.433639633717971E-12
i -2.161199123063629E-15 6.099447788569606E-15 -5.281393744934226E-12 -7.705338147503201E-12 6.433639633717971E-12 1.081164524239895E-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 11.3   n/a MPO473772  
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. 2019-August); 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.]
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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