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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 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09682399234959227 3.8444e-08  
a 2.759810781575551 1.4333e-08 au
q 2.492594883573958 1.0829e-07 au
i 18.04153629719329 4.904e-06 deg
node 124.3935436660201 1.4993e-05 deg
peri 88.32401221900133 2.7857e-05 deg
M 180.0702212643354 2.3124e-05 deg
tp 2458237.485496345449
(2018-Apr-28.98549635)
0.00010755 JED
period 1674.624293997627
4.58
1.3046e-05
3.572e-08
d
yr
n .2149735921605531 1.6747e-09 deg/d
Q 3.027026679577145 1.5721e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1360  
   data-arc span      36030 days (98.64 yr)  
   first obs. used      1917-04-22  
   last obs. used      2015-12-14  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .51369  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Jan-04 12:34:58  

Additional Information
 Earth MOID = 1.56628 au 
 Jupiter MOID = 2.17717 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 LCDB (Rev. 2015-December); Warner et al., 2009 Published Reference List:
[Stephens, R.D. (2013) Minor Planet Bul. 40, 178-179.]
[Stephens, R.D. (2014) Minor Planet Bul. 41, 226-230.]
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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