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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 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04488940670780044 3.0488e-08  
a 2.786699481953609 9.1146e-09 au
q 2.661606195535777 8.4549e-08 au
i 1.012599320704358 3.1947e-06 deg
node 59.43183457489643 0.00020082 deg
peri 233.8521843252219 0.00020448 deg
M 100.4989959536819 3.842e-05 deg
tp 2458526.156608617166
(2019-Feb-11.65660862)
0.0001814 TDB
period 1699.157481896854
4.65
8.3363e-06
2.282e-08
d
yr
n .2118697082733698 1.0395e-09 deg/d
Q 2.911792768371442 9.5237e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3531  
   data-arc span      36610 days (100.23 yr)  
   first obs. used      1920-05-09  
   last obs. used      2020-08-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43637  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:28:41  

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

[ show close-approach data ]
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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