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636 Erika (A907 CE)
Classification: Main-belt Asteroid          SPK-ID: 2000636
[ 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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .169236593797076 3.4951e-08  
a 2.913014700374897 1.0496e-08 au
q 2.42002601480264 1.0065e-07 au
i 7.928156593925714 4.5555e-06 deg
node 34.59904710079738 2.6803e-05 deg
peri 298.5227136136473 3.0209e-05 deg
M 99.41737211844647 1.5455e-05 deg
tp 2458498.998519048410
(2019-Jan-15.49851905)		 7.7217e-05 TDB
period 1815.98577085175
4.97		 9.8148e-06
2.687e-08		 d
yr
n .1982394387546052 1.0714e-09 deg/d
Q 3.406003385947154 1.2272e-08 au
   Orbit Determination Parameters
   # obs. used (total)      3145  
   data-arc span      41537 days (113.72 yr)  
   first obs. used      1907-02-15  
   last obs. used      2020-11-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42288  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 01:55:03  

Additional Information
 Earth MOID = 1.42279 au 
 Jupiter MOID = 2.02886 au 
 T_jup = 3.247 
[ hide covariance matrix ]
Orbital Elements at Epoch 2455971.5 (2012-Feb-14.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1735121226211122 3.538e-08  
q 2.405174194020697 1.0248e-07 au
tp 2456679.131863525502
(2014-Jan-21.63186353)		 7.2309e-05 TDB
node 34.70037866028465 2.6864e-05 deg
peri 297.6690220091205 3.0024e-05 deg
i 7.927867370619507 4.5507e-06 deg
   Orbit Determination Parameters
   # obs. used (total)      3145  
   data-arc span      41537 days (113.72 yr)  
   first obs. used      1907-02-15  
   last obs. used      2020-11-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42288  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 01:55:03  

Additional Information
 Jupiter MOID = 2.02886 au 
 T_jup = 3.247 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.251770997745271E-15 -3.613411446007185E-15 6.933776139546846E-13 4.427806547124416E-15 9.747176644360137E-14 7.529873160706069E-16
q -3.613411446007185E-15 1.050277774285123E-14 -1.926320732187672E-12 -1.192527231954837E-14 -2.762155820790394E-13 -1.866854968743562E-15
tp 6.933776139546846E-13 -1.926320732187672E-12 5.228618548594795E-9 2.56999670187693E-13 9.79571936642735E-10 1.763934287762228E-12
node 4.427806547124416E-15 -1.192527231954837E-14 2.56999670187693E-13 7.216615222098983E-10 -7.144993751522111E-10 3.061364257523575E-12
peri 9.747176644360137E-14 -2.762155820790394E-13 9.79571936642735E-10 -7.144993751522111E-10 9.014315901696291E-10 -2.771915515047823E-12
i 7.529873160706069E-16 -1.866854968743562E-15 1.763934287762228E-12 3.061364257523575E-12 -2.771915515047823E-12 2.070855683951596E-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 9.6   n/a MPO458832  
diameter diameter 73.147 km 0.565 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 14.603 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Piironen, J.; Bowell, E.; Erikson, A.; Magnusson, P. (1994) Astron. Astrophys. Suppl. Ser. 106, 587-595.]
[Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2007) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Durech, J.; Kaasalainen, M.; Warner, B.D.; Fauerbach, M.; et al. (2009) Astron. Astrophys. 493, 291-297.]
[Durech, J.; Hanus, J.; Oszkiewsicz, D.; Vanco, R. (2016) Astron. Astrophys. 587, A48.]
geometric albedo albedo 0.048   0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

636 Erika (A907 CE)          Discovered 1907-Feb-08 by Metcalf, J. H. at Taunton
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A907 CE = 1954 UT1 
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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