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729 Watsonia (A912 CE)
Classification: Main-belt Asteroid          SPK-ID: 2000729
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0974331271914161 3.6638e-08  
a 2.758631042495269 9.4062e-09 au
q 2.489848993257639 1.0159e-07 au
i 18.05084936657538 3.8872e-06 deg
node 124.3278613480837 1.3484e-05 deg
peri 87.75580124806581 2.4011e-05 deg
M 164.7321588000135 2.0557e-05 deg
tp 2458234.701089059663
(2018-Apr-26.20108906)
9.4767e-05 TDB
period 1673.550628770725
4.58
8.5596e-06
2.343e-08
d
yr
n .2151115083171587 1.1002e-09 deg/d
Q 3.0274130917329 1.0323e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2903  
   data-arc span      37824 days (103.56 yr)  
   first obs. used      1917-04-22  
   last obs. used      2020-11-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39807  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 01:55:40  

Additional Information
 Earth MOID = 1.56452 au 
 Jupiter MOID = 2.17101 au 
 T_jup = 3.264 
[ 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 9.4   n/a MPO502160 IRAS observations used: 17
diameter diameter 50.025 km 0.415 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 25.230 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Stephens, R.D. (2013) Minor Planet Bull. 40, 178-179.]
[Stephens, R.D. (2014) Minor Planet Bull. 41, 226-230.]
[Devogele, M.; Tanga, P.; Bendjoya, P.; Rivet, J.P.; et al. (2017) ArXiv:1707.07503.]
geometric albedo albedo 0.133   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.780   0.014 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=11.06, mean=11.07, max.=11.07) deg.
U-B UB 0.375   0.021 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #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 (A912 CE)          Discovered 1912-Feb-09 by Metcalf, J. H. at Winchester
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A912 CE = 1944 DP 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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