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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 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .111582278584113 3.1141e-08  
a 3.118739469485534 1.1582e-08 au
q 2.770743413170131 9.8567e-08 au
i 3.612693333552925 4.0544e-06 deg
node 34.06819666814389 6.0287e-05 deg
peri 31.3149372619393 6.3126e-05 deg
M 276.8921008665253 1.9311e-05 deg
tp 2459464.915680665679
(2021-Sep-07.41568067)
0.00010797 TDB
period 2011.71786055055
5.51
1.1207e-05
3.068e-08
d
yr
n .1789515354312549 9.9688e-10 deg/d
Q 3.466735525800938 1.2875e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3304  
   data-arc span      49144 days (134.55 yr)  
   first obs. used      1886-04-06  
   last obs. used      2020-10-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44312  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:31:39  

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 00:01 Jupiter 1.96020275217431 1.96020224635603 1.96020325799281 3.58558559021191 3.46297628266313 2424813.848594151 1.42069504036862 58.8023921767987 15.3668711556195 79.2966650659667 3187925.87440782 T 38 CATAB v2.0f-lin.ifort 2020-Nov-13 04:31:49 2020-Nov-13 04:31
1936-Dec-17 21:35 00:01 Jupiter 1.85078790418022 1.8507875865389 1.85078822182154 2.44103700426647 2.24574073845687 2428520.399627638 1.27946369092885 46.1657023280123 7.08633508212607 84.3978466874459 3923179.63499894 T 38 CATAB v2.0f-lin.ifort 2020-Nov-13 04:31:49 2020-Nov-13 04:31
1947-Feb-14 02:37 00:01 Jupiter 1.96483308022333 1.96483263902028 1.96483352142639 2.68484809089558 2.51917180854711 2432230.609209515 1.05334239244523 52.3052691462556 8.53410417026521 80.182921643852 3283769.40435153 T 38 CATAB v2.0f-lin.ifort 2020-Nov-13 04:31:49 2020-Nov-13 04:31
2008-Oct-17 23:41 < 00:01 Jupiter 1.85351519721937 1.85351485024446 1.85351554419418 2.66644096442281 2.48916532748104 2454757.486567815 0.212807849041334 39.6527934750914 7.58763370784427 83.1294140483654 3653397.12188283 T 38 CATAB v2.0f-lin.ifort 2020-Nov-13 04:31:49 2020-Nov-13 04:31
2018-Dec-09 02:55 < 00:01 Jupiter 1.89657552477548 1.89657520752197 1.89657584202899 2.45100392701809 2.26146141148141 2458461.621443423 0.233495060044314 46.1092353201973 4.20261416873491 82.3943542919808 3865746.60808843 T 38 CATAB v2.0f-lin.ifort 2020-Nov-13 04:31:49 2020-Nov-13 04:31
2080-Aug-17 03:26 00:01 Jupiter 1.8860958368299 1.88609541799974 1.88609625566005 3.0781609635073 2.92863439819575 2480993.643209942 1.12832876661638 44.9767448188651 11.9788859367101 84.332084362083 2974600.95997292 T 38 CATAB v2.0f-lin.ifort 2020-Nov-13 04:31:49 2020-Nov-13 04:31
2090-Oct-05 20:34 00:01 Jupiter 1.84825423061806 1.8482539120232 1.84825454921293 2.3403970817793 2.13562486369649 2484695.356757609 1.32350047222805 46.8423935619553 7.7829991299675 83.7018967631446 4035907.50828975 T 38 CATAB v2.0f-lin.ifort 2020-Nov-13 04:31:49 2020-Nov-13 04:31
2152-Jun-14 22:56 00:02 Jupiter 1.94585638238583 1.94585573562157 1.94585702915087 3.61673455606974 3.49430649206209 2507227.455312774 2.26267040725006 90.6184290919559 15.7471663559802 79.0189512891162 3133793.90263803 T 38 CATAB v2.0f-lin.ifort 2020-Nov-13 04:31:49 2020-Nov-13 04:31
2162-Aug-07 00:21 00:03 Jupiter 1.83047224624541 1.83047192888476 1.83047256360606 2.41952120421217 2.22004820100225 2510932.514263190 2.52281955789451 52.4372797543362 13.3299762330344 -87.0887060941311 3137173.51165287 T 38 CATAB v2.0f-lin.ifort 2020-Nov-13 04:31:49 2020-Nov-13 04:31
2172-Sep-30 02:37 00:03 Jupiter 1.95624757172695 1.95624684749183 1.9562482959623 2.64863003068526 2.4797730648513 2514639.608956251 2.63100309050782 66.8734592964283 11.2706524336617 73.9338875339498 2760687.25882793 T 38 CATAB v2.0f-lin.ifort 2020-Nov-13 04:31:49 2020-Nov-13 04:31

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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