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140 Siwa
Classification: Main-belt Asteroid          SPK-ID: 2000140
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2456800.5 (2014-May-23.0) TDB
Reference: JPL 115 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2164235900272045 3.342e-08  
a 2.732572669114882 9.405e-09 AU
q 2.141179482054819 9.1236e-08 AU
i 3.186594591455054 3.8935e-06 deg
node 107.2664290718745 6.3605e-05 deg
peri 196.8048333098581 6.408e-05 deg
M 25.9351331563101 9.4692e-06 deg
tp 2456681.638285990661
(2014-Jan-24.13828599)
4.3271e-05 JED
period 1649.893863488845
4.52
8.518e-06
2.332e-08
d
yr
n .2181958536646403 1.1265e-09 deg/d
Q 3.323965856174945 1.1441e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1977  
   data-arc span      49896 days (136.61 yr)  
   first obs. used      1877-03-11  
   last obs. used      2013-10-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .5859  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jun-16 13:09:21  

Additional Information
 Earth MOID = 1.12533 AU 
 T_jup = 3.317 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 8.34 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 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 34.407 h n/a Asteroid Lightcurve DataBase (Rev. 2013-Sep-12) Published Reference List:
[Pilcher, F. (2011) Minor Planet Bul. 38, 76-78.]
[Pilcher, F. (2012) Minor Planet Bul. 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 .721 mag .028 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=2; phase (min.=5.40, mean=9.53, max.=13.67) deg.
U-B UB .299 mag .025 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #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          Discovered 1874-Oct-13 by Palisa, J. at Pola
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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