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729 Watsonia (1912 OD)
Classification: Main-belt Asteroid          SPK-ID: 2000729
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 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0965351240736739 3.9807e-08  
a 2.760366459460815 1.5945e-08 AU
q 2.493894140807958 1.1354e-07 AU
i 18.04242192478576 5.2448e-06 deg
node 124.3982195936025 1.5321e-05 deg
peri 88.32224694200814 2.9628e-05 deg
M 94.11285195341509 2.4273e-05 deg
tp 2456562.579805432027
(2013-Sep-27.07980543)
0.00011355 JED
period 1675.130088741823
4.59
1.4514e-05
3.974e-08
d
yr
n .214908682268607 1.8621e-09 deg/d
Q 3.026838778113673 1.7484e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1227  
   data-arc span      35591 days (97.44 yr)  
   first obs. used      1917-04-22  
   last obs. used      2014-10-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .53356  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Nov-10 12:43:49  

Additional Information
 Earth MOID = 1.56941 AU 
 T_jup = 3.264 
[ 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 9.31 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 17
diameter diameter 49.15 km 1.5 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 17
rotation period rot_per 25.230 h n/a Asteroid Lightcurve DataBase (Rev. 2014-Mar-01) Published Reference List:
[Stephens, R.D. (2013) Minor Planet Bul. 40, 178-179.]
geometric albedo albedo 0.1381   0.009 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 17
B-V BV .780 mag .014 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=2; phase (min.=11.06, mean=11.07, max.=11.07) deg.
U-B UB .375 mag .021 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=2; phase (min.=11.06, mean=11.07, max.=11.07) deg.
Tholen spectral type spec_T STGD   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices
SMASSII spectral type spec_B L   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)

729 Watsonia (1912 OD)          Discovered 1912-Feb-09 by Metcalf, J. H. at Winchester
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1912 OD = 1944 DP 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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