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257 Silesia (A886 GB)
Classification: Main-belt Asteroid          SPK-ID: 2000257
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1115822917855615 3.476e-08  
a 3.118739473933813 1.2675e-08 au
q 2.770743375950182 1.0778e-07 au
i 3.612696076757691 4.2438e-06 deg
node 34.06823249129798 6.2502e-05 deg
peri 31.31490201810046 6.5266e-05 deg
M 276.8920982772159 1.9598e-05 deg
tp 2459464.915696128612
(2021-Sep-07.41569613)
0.00010978 TDB
period 2011.717864854539
5.51
1.2264e-05
3.358e-08
d
yr
n .1789515350483953 1.091e-09 deg/d
Q 3.466735571917445 1.409e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3039  
   data-arc span      49062 days (134.32 yr)  
   first obs. used      1886-04-06  
   last obs. used      2020-08-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45793  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:12:55  

Additional Information
 Earth MOID = 1.78503 au 
 Jupiter MOID = 1.82967 au 
 T_jup = 3.204 
[ 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 9.4   n/a MPO492751 IRAS observations used: 5
diameter diameter 72.66 km 2.2 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 5
rotation period rot_per 15.7095 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Hanus, J.; Durech, J.; Broz, M.; Marciniak, A.; et al. (2013) Astron. Astrophys. 551, A67.]
geometric albedo albedo 0.0545   0.003 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 5
B-V BV 0.761   0.020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=6.98 deg.
U-B UB 0.384   0.030 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=6.98 deg.
Tholen spectral type spec_T SCTU   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices
SMASSII spectral type spec_B Ch   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)

257 Silesia (A886 GB)          Discovered 1886-Apr-05 by Palisa, J. at Vienna
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A886 GB = 1929 DD = 1952 FL1 = 1952 HU 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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