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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 
[ 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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1926-Oct-25 08:22 00:02 Jupiter 1.96020274927449 1.9602022332476 1.96020326530149 3.58558528856434 3.46297597015091 2424813.848498334 1.49439400552694 62.2041220483038 15.4427005777876 79.5100259118217 3083476.05364997 T 34 CATAB v2.0f-lin.ifort 2020-May-20 01:02:23 2020-May-20 01:02
1936-Dec-17 21:35 00:01 Jupiter 1.85078787411537 1.85078751703591 1.85078823119482 2.44103673416397 2.24574044155504 2428520.399528688 1.34897272695804 46.452131597499 7.11330372778727 84.3294942611877 3302228.326669 T 34 CATAB v2.0f-lin.ifort 2020-May-20 01:02:23 2020-May-20 01:02
1947-Feb-14 02:37 00:01 Jupiter 1.96483304655652 1.96483259713212 1.96483349598091 2.68484820060758 2.51917192254229 2432230.609132152 1.11689783114146 55.9603679697626 8.99048977490126 80.8548459838555 3071988.94550266 T 34 CATAB v2.0f-lin.ifort 2020-May-20 01:02:23 2020-May-20 01:02
2008-Oct-17 23:41 < 00:01 Jupiter 1.85351519436208 1.85351482908622 1.85351555963784 2.66644075699631 2.48916510499883 2454757.486586229 0.228779676216387 41.8133810529479 8.21834327981523 83.2561635669326 3487978.07712333 T 34 CATAB v2.0f-lin.ifort 2020-May-20 01:02:23 2020-May-20 01:02
2018-Dec-09 02:55 < 00:01 Jupiter 1.89657545816306 1.89657507459363 1.89657584173239 2.45100388280396 2.26146135662532 2458461.621459684 0.265367494379328 48.3001584705858 5.29989009358133 81.9596049154508 3222790.11590351 T 34 CATAB v2.0f-lin.ifort 2020-May-20 01:02:23 2020-May-20 01:02
2080-Aug-17 03:26 00:01 Jupiter 1.88609588030163 1.88609545740008 1.88609630320328 3.07816103038398 2.92863447202128 2480993.643326745 1.27249799426736 51.4182870884076 12.0908930693503 84.8344784661102 2936933.25266253 T 34 CATAB v2.0f-lin.ifort 2020-May-20 01:02:23 2020-May-20 01:02
2090-Oct-05 20:34 00:01 Jupiter 1.84825416613924 1.8482537594722 1.84825457280617 2.34039690559846 2.13562466313649 2484695.356893521 1.46876501217542 47.222338587728 9.19233224368303 84.1814505631505 3279246.06734964 T 34 CATAB v2.0f-lin.ifort 2020-May-20 01:02:23 2020-May-20 01:02
2152-Jun-14 22:56 00:03 Jupiter 1.94585648237501 1.94585578444735 1.94585718030378 3.61673519835817 3.49430716325528 2507227.455544719 2.50361604606737 102.167648541426 15.8956965606946 79.0165077571957 3052938.39564433 T 34 CATAB v2.0f-lin.ifort 2020-May-20 01:02:23 2020-May-20 01:02
2162-Aug-07 00:21 00:03 Jupiter 1.83047222266139 1.8304718641706 1.83047258115208 2.41952114970365 2.2200481389106 2510932.514513772 2.77489356640489 55.9139674713515 14.8060426532749 -85.3576402964945 3014555.88735458 T 34 CATAB v2.0f-lin.ifort 2020-May-20 01:02:23 2020-May-20 01:02
2172-Sep-30 02:37 00:03 Jupiter 1.95624742344423 1.95624656302578 1.95624828386301 2.64862970415896 2.47977270285554 2514639.609197035 2.87586731282018 73.0439984391464 12.7904509287536 72.6868127928882 2318660.9520775 T 34 CATAB v2.0f-lin.ifort 2020-May-20 01:02:23 2020-May-20 01:02

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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