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894 Erda (A918 LA)
Classification: Main-belt Asteroid          SPK-ID: 2000894
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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 43 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1104234558003196 3.4714e-08  
a 3.1196920212297 1.3713e-08 au
q 2.775204847212832 1.0508e-07 au
i 12.73270349222695 4.0031e-06 deg
node 190.6098126674255 1.7782e-05 deg
peri 116.3312827305293 2.5994e-05 deg
M 150.2029364760269 1.92e-05 deg
tp 2458160.765623081134
(2018-Feb-11.26562308)
0.00010632 TDB
period 2012.639584706395
5.51
1.327e-05
3.633e-08
d
yr
n .1788695813873287 1.1794e-09 deg/d
Q 3.464179195246567 1.5227e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3019  
   data-arc span      41462 days (113.52 yr)  
   first obs. used      1907-05-12  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4008  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 01:56:59  

Additional Information
 Earth MOID = 1.79056 au 
 Jupiter MOID = 1.90175 au 
 T_jup = 3.169 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456537.5 (2013-Sep-02.0) TDB
Reference: JPL 43 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1139320957419774 3.5406e-08  
q 2.760410819059063 1.0789e-07 au
tp 2456135.523534127454
(2012-Jul-27.02353413)
9.8611e-05 TDB
node 190.8477827332932 1.7873e-05 deg
peri 113.8208246732858 2.5271e-05 deg
i 12.69853154891364 3.9971e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3019  
   data-arc span      41462 days (113.52 yr)  
   first obs. used      1907-05-12  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4008  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 01:56:59  

Additional Information
 Jupiter MOID = 1.90175 au 
 T_jup = 3.169 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.253612461995879E-15 -3.79842935626064E-15 -1.002585238972571E-14 -4.264737140705777E-15 2.968423851771847E-15 -1.25525105013888E-15
q -3.79842935626064E-15 1.164039354279354E-14 1.57644282920015E-13 1.390641864692507E-14 1.572179423585051E-14 4.839911539520959E-15
tp -1.002585238972571E-14 1.57644282920015E-13 9.724130953880729E-9 2.070175051454748E-12 1.780023888539478E-9 2.728139761454719E-12
node -4.264737140705777E-15 1.390641864692507E-14 2.070175051454748E-12 3.194523130884229E-10 -3.115668890193948E-10 3.793090537383137E-12
peri 2.968423851771847E-15 1.572179423585051E-14 1.780023888539478E-9 -3.115668890193948E-10 6.38623274030831E-10 -3.373437952187145E-12
i -1.25525105013888E-15 4.839911539520959E-15 2.728139761454719E-12 3.793090537383137E-12 -3.373437952187145E-12 1.597695149680243E-11

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 9.7   n/a MPO502161  
diameter diameter 28.309 km 1.544 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 4.6897 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Behrend, R. (2001) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Stephens, R.D. (2002) Minor Planet Bull. 29, 2-3.]
[Higgins, D.; Goncalves, R.M.D. (2007) Minor Planet Bull. 34, 16-18.]
geometric albedo albedo 0.120   0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

894 Erda (A918 LA)          Discovered 1918-Jun-04 by Wolf, M. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A918 LA = 1973 QB = A907 JC = A912 HD 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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