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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 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04684501101157452 3.4625e-08  
a 2.786153269829929 1.0158e-08 au
q 2.655635889224811 9.6498e-08 au
i 1.014507426249476 3.9416e-06 deg
node 59.40755402925218 0.00021592 deg
peri 234.9083648076272 0.00021977 deg
M 162.9806897621872 4.3663e-05 deg
tp 2456831.476549473184
(2014-Jun-22.97654947)
0.00020614 JED
period 1698.657936677137
4.65
9.2894e-06
2.543e-08
d
yr
n .2119320154028309 1.159e-09 deg/d
Q 2.916670650435046 1.0633e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2246  
   data-arc span      35021 days (95.88 yr)  
   first obs. used      1920-05-09  
   last obs. used      2016-03-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .51938  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Apr-25 12:32:13  

Additional Information
 Earth MOID = 1.6394 au 
 Jupiter MOID = 2.1606 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. 2016-February); 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. (2016) 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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