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JPL Small-Body Database Browser
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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1115822950357843 3.6187e-08  
a 3.118739475001071 1.3097e-08 au
q 2.770743366761754 1.1147e-07 au
i 3.61269704470768 4.3258e-06 deg
node 34.06823940389499 6.2782e-05 deg
peri 31.31489524725335 6.5541e-05 deg
M 276.8920976430023 1.9679e-05 deg
tp 2459464.915699911054
(2021-Sep-07.41569991)
0.0001103 TDB
period 2011.717865887178
5.51
1.2672e-05
3.469e-08
d
yr
n .1789515349565373 1.1272e-09 deg/d
Q 3.466735583240387 1.4558e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2895  
   data-arc span      48965 days (134.06 yr)  
   first obs. used      1886-04-06  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46717  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 01:02:11  

Additional Information
 Earth MOID = 1.78503 au 
 Jupiter MOID = 1.82967 au 
 T_jup = 3.204 
[ hide covariance matrix ]
Orbital Elements at Epoch 2455829.5 (2011-Sep-25.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1124807794836806 3.6689e-08  
q 2.767906463697202 1.1335e-07 au
tp 2455412.773019420561
(2010-Aug-04.27301942)
0.00010645 TDB
node 34.38783486807168 6.2138e-05 deg
peri 26.99005424073158 6.4969e-05 deg
i 3.636660755374465 4.3444e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2895  
   data-arc span      48965 days (134.06 yr)  
   first obs. used      1886-04-06  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46717  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 01:02:11  

Additional Information
 Jupiter MOID = 1.82967 au 
 T_jup = 3.204 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.346080085156903E-15 -4.139330008352015E-15 -4.336064500170952E-13 -2.810774983864957E-15 -9.809291420731612E-14 5.479776840794779E-16
q -4.139330008352015E-15 1.284838804472284E-14 1.408422736216217E-12 1.220755447042766E-14 3.134848690753064E-13 -1.635585958770254E-15
tp -4.336064500170952E-13 1.408422736216217E-12 1.133164450728977E-8 -1.119091056515771E-11 2.042075591881706E-9 -1.429744614241819E-12
node -2.810774983864957E-15 1.220755447042766E-14 -1.119091056515771E-11 3.861078715629654E-9 -3.85448750999736E-9 -2.977730839672599E-11
peri -9.809291420731612E-14 3.134848690753064E-13 2.042075591881706E-9 -3.85448750999736E-9 4.220939737585213E-9 2.948027159774925E-11
i 5.479776840794779E-16 -1.635585958770254E-15 -1.429744614241819E-12 -2.977730839672599E-11 2.948027159774925E-11 1.887366756932531E-11

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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