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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 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04673953427467155 3.8627e-08  
a 2.787395895846126 1.1796e-08 AU
q 2.657114309835147 1.1005e-07 AU
i 1.014557332248326 4.2187e-06 deg
node 59.40935917028361 0.00026145 deg
peri 235.4674194555952 0.00026551 deg
M 35.30385868469207 4.8624e-05 deg
tp 2456833.807489839308
(2014-Jun-25.30748984)
0.00022962 JED
period 1699.794467052672
4.65
1.079e-05
2.954e-08
d
yr
n .2117903116982228 1.3444e-09 deg/d
Q 2.917677481857104 1.2347e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1749  
   data-arc span      34498 days (94.45 yr)  
   first obs. used      1920-05-09  
   last obs. used      2014-10-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .53183  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Nov-10 12:45:19  

Additional Information
 Earth MOID = 1.64244 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 Asteroid Lightcurve DataBase (Rev. 2014-Mar-01) 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]
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 (012)
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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