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JPL Small-Body Database Browser
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257 Silesia
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 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1115822931979919 3.6243e-08  
a 3.118739474524066 1.3112e-08 au
q 2.770743372069571 1.1162e-07 au
i 3.612697048116606 4.3296e-06 deg
node 34.0682392061129 6.2784e-05 deg
peri 31.31489565746806 6.5543e-05 deg
M 276.8920976812889 1.968e-05 deg
tp 2459464.915699590557
(2021-Sep-07.41569959)
0.0001103 TDB
period 2011.717865425646
5.51
1.2687e-05
3.474e-08
d
yr
n .1789515349975927 1.1285e-09 deg/d
Q 3.466735576978562 1.4575e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2884  
   data-arc span      48795 days (133.59 yr)  
   first obs. used      1886-04-06  
   last obs. used      2019-11-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46752  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:22:27  

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          Discovered 1886-Apr-05 by Palisa, J. at Vienna
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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