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1128 Astrid (1929 EB)
Classification: Main-belt Asteroid          SPK-ID: 2001128
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04677053505214861 3.511e-08  
a 2.786512189987945 1.0377e-08 au
q 2.656185523932875 9.8194e-08 au
i 1.014528814252368 3.944e-06 deg
node 59.40820380437046 0.00022438 deg
peri 235.0622301350265 0.00022819 deg
M 120.4371714245648 4.3998e-05 deg
tp 2456832.108081810737
(2014-Jun-23.60808181)
0.00020781 JED
period 1698.986186140199
4.65
9.4904e-06
2.598e-08
d
yr
n .2118910694723524 1.1836e-09 deg/d
Q 2.916838856043016 1.0862e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2125  
   data-arc span      34921 days (95.61 yr)  
   first obs. used      1920-05-09  
   last obs. used      2015-12-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .52123  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Jan-04 12:37:14  

Additional Information
 Earth MOID = 1.63849 au 
 Jupiter MOID = 2.15973 au 
 T_jup = 3.329 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 10.9 mag n/a MPO313426  
diameter diameter 34.69 km 2.1 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 5
rotation period rot_per 10.228 h n/a LCDB (Rev. 2015-December); 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 0.0770   0.010 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 5
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 | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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