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140 Siwa (A874 TB)
Classification: Main-belt Asteroid          SPK-ID: 2000140
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 152 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2141401020698535 3.4549e-08  
a 2.734694957268412 7.7123e-09 au
q 2.149087099989041 9.3362e-08 au
i 3.185538900248087 3.6793e-06 deg
node 107.1777306444042 5.9485e-05 deg
peri 196.8153001044088 5.9973e-05 deg
M 145.7487005347375 9.0961e-06 deg
tp 2458331.749758012212
(2018-Aug-01.24975801)
4.0995e-05 TDB
period 1651.816353986797
4.52
6.9876e-06
1.913e-08
d
yr
n .2179419032455453 9.2195e-10 deg/d
Q 3.320302814547784 9.3638e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3787  
   data-arc span      52464 days (143.64 yr)  
   first obs. used      1877-03-11  
   last obs. used      2020-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4734  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:32:57  

Additional Information
 Earth MOID = 1.13408 au 
 Jupiter MOID = 1.93021 au 
 T_jup = 3.317 
[ 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 8.4   n/a MPO502154 IRAS observations used: 6
diameter diameter 109.79 km 3.0 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 6
rotation period rot_per 34.445 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Pilcher, F. (2011) Minor Planet Bull. 38, 76-78.]
[Pilcher, F. (2012) Minor Planet Bull. 39, 134-135.]
geometric albedo albedo 0.0676   0.004 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 6
B-V BV 0.721   0.028 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=5.40, mean=9.53, max.=13.67) deg.
U-B UB 0.299   0.025 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=5.40, mean=9.53, max.=13.67) deg.
Tholen spectral type spec_T P   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B Xc   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)

140 Siwa (A874 TB)          Discovered 1874-Oct-13 by Palisa, J. at Pola
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A874 TB = 1948 AL 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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