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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 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 119 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2163328619383139 3.2722e-08  
a 2.732069397770517 9.2278e-09 AU
q 2.141033005936735 8.901e-08 AU
i 3.186592796669705 3.8094e-06 deg
node 107.266166680959 6.3549e-05 deg
peri 196.7709489082111 6.4026e-05 deg
M 69.61640256591443 9.4047e-06 deg
tp 2456681.533484872261
(2014-Jan-24.03348487)
4.2776e-05 JED
period 1649.438080878485
4.52
8.3567e-06
2.288e-08
d
yr
n .2182561468498807 1.1058e-09 deg/d
Q 3.323105789604298 1.1224e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      2016  
   data-arc span      50273 days (137.64 yr)  
   first obs. used      1877-03-11  
   last obs. used      2014-11-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .58716  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Nov-10 12:41:11  

Additional Information
 Earth MOID = 1.12711 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. 2014-Mar-01) 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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