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1128 Astrid (1929 EB)
Classification: Main-belt Asteroid          SPK-ID: 2001128
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 45 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04488940620976312 3.032e-08  
a 2.786699482182723 8.9808e-09 au
q 2.661606197142486 8.3907e-08 au
i 1.012599340287321 3.1933e-06 deg
node 59.43182593187223 0.00019613 deg
peri 233.8521918958444 0.00019976 deg
M 100.4989968995378 3.7943e-05 deg
tp 2458526.156604094339
(2019-Feb-11.65660409)
0.00017909 TDB
period 1699.157482106403
4.65
8.2139e-06
2.249e-08
d
yr
n .2118697082472409 1.0242e-09 deg/d
Q 2.91179276722296 9.3839e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3687  
   data-arc span      36711 days (100.51 yr)  
   first obs. used      1920-05-09  
   last obs. used      2020-11-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42851  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 01:58:30  

Additional Information
 Earth MOID = 1.64561 au 
 Jupiter MOID = 2.1619 au 
 T_jup = 3.329 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456361.5 (2013-Mar-10.0) TDB
Reference: JPL 45 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04671008570113133 3.026e-08  
q 2.656345871918621 8.407e-08 au
tp 2456836.354200280892
(2014-Jun-27.85420028)
0.0001726 TDB
node 59.4090692817386 0.00019578 deg
peri 236.0681199009993 0.00019915 deg
i 1.014836237827761 3.1926e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3687  
   data-arc span      36711 days (100.51 yr)  
   first obs. used      1920-05-09  
   last obs. used      2020-11-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42851  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 01:58:30  

Additional Information
 Jupiter MOID = 2.1619 au 
 T_jup = 3.329 
Orbit Covariance (6×6)
  e q tp node peri i
e 9.156442349734216E-16 -2.530640685325084E-15 5.482536098669652E-13 1.493916751322412E-15 9.784466231395506E-14 -6.021700561572341E-18
q -2.530640685325084E-15 7.067684732210532E-15 -1.639445166037657E-12 -5.577639198849559E-15 -3.007880068425281E-13 1.818001964043026E-17
tp 5.482536098669652E-13 -1.639445166037657E-12 2.978944375146249E-8 -2.295599133607397E-12 6.305439390617701E-9 -2.620716371857938E-13
node 1.493916751322412E-15 -5.577639198849559E-15 -2.295599133607397E-12 3.833147016793486E-8 -3.83256741702157E-8 -3.318897993109815E-11
peri 9.784466231395506E-14 -3.007880068425281E-13 6.305439390617701E-9 -3.83256741702157E-8 3.966011481887105E-8 3.312562581496656E-11
i -6.021700561572341E-18 1.818001964043026E-17 -2.620716371857938E-13 -3.318897993109815E-11 3.312562581496656E-11 1.019268328162762E-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 10.9   n/a MPO313426  
diameter diameter 41.851 km 0.278 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 10.228 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2010) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.031   0.004 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
SMASSII spectral type spec_B C   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)

1128 Astrid (1929 EB)          Discovered 1929-Mar-10 by Delporte, E. at Uccle
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1929 EB = 1949 QF2 = 1954 UL3 = 1964 VW = 1972 LM1 = A917 SQ = A920 JA 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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