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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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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 48 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0447642326119953 2.0169e-08  
a 2.787381462417378 8.3169e-09 au
q 2.662606470255363 5.4451e-08 au
i 1.012532626953928 9.4937e-07 deg
node 59.43167770528539 4.9448e-05 deg
peri 234.1240323841265 5.7335e-05 deg
M 142.5918310375296 1.6511e-05 deg
tp 2458527.236325366385
(2019-Feb-12.73632537)
7.7545e-05 TDB
period 1699.781264498309
4.65
7.6077e-06
2.083e-08
d
yr
n .2117919567175922 9.4791e-10 deg/d
Q 2.912156454579394 8.6892e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3959  
   data-arc span      36834 days (100.85 yr)  
   first obs. used      1920-05-09  
   last obs. used      2021-03-14  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .41721  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 12:01:47  

Additional Information
 Earth MOID = 1.64467 au 
 Jupiter MOID = 2.16075 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 10.91   n/a E2021B10  
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

[ 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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