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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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 44 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04488940634538854 3.0326e-08  
a 2.786699482152897 8.987e-09 au
q 2.661606196736052 8.3931e-08 au
i 1.012599336380598 3.1935e-06 deg
node 59.43182680610966 0.00019634 deg
peri 233.8521913662511 0.00019996 deg
M 100.498996588201 3.7967e-05 deg
tp 2458526.156605571428
(2019-Feb-11.65660557)		 0.0001792 TDB
period 1699.157482079124
4.65		 8.2196e-06
2.25e-08		 d
yr
n .2118697082506423 1.0249e-09 deg/d
Q 2.911792767569743 9.3905e-09 au
   Orbit Determination Parameters
   # obs. used (total)      3680  
   data-arc span      36700 days (100.48 yr)  
   first obs. used      1920-05-09  
   last obs. used      2020-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42874  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:22:13  

Additional Information
 Earth MOID = 1.64561 au 
 Jupiter MOID = 2.1619 au 
 T_jup = 3.329 
[ show covariance matrix ]

[ 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. 2019-August); 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 
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