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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 ]

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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 47 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09722706959145233 1.9074e-08  
a 2.759172141639033 8.9715e-09 au
q 2.490905919809098 5.2364e-08 au
i 18.05081292270962 4.6561e-07 deg
node 124.3275017627061 2.128e-06 deg
peri 87.7085503920549 8.4025e-06 deg
M 207.8035100499446 1.0786e-05 deg
tp 2459908.231877410033
(2022-Nov-24.73187741)
5.2021e-05 TDB
period 1674.04304758422
4.58
8.1648e-06
2.235e-08
d
yr
n .2150482333889258 1.0488e-09 deg/d
Q 3.027438363468968 9.8437e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3271  
   data-arc span      37956 days (103.92 yr)  
   first obs. used      1917-04-22  
   last obs. used      2021-03-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .37914  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 18:48:35  

Additional Information
 Earth MOID = 1.56464 au 
 Jupiter MOID = 2.16982 au 
 T_jup = 3.264 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456802.5 (2014-May-25.0) TDB
Reference: JPL 47 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09643970718688887 1.9177e-08  
q 2.4940651165546 5.2662e-08 au
tp 2456562.522532191972
(2013-Sep-27.02253219)
4.4524e-05 TDB
node 124.3985378161575 2.1271e-06 deg
peri 88.3162028494626 8.3526e-06 deg
i 18.04221429881819 4.6571e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      3271  
   data-arc span      37956 days (103.92 yr)  
   first obs. used      1917-04-22  
   last obs. used      2021-03-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .37914  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 18:48:35  

Additional Information
 Jupiter MOID = 2.16982 au 
 T_jup = 3.264 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.677747095656186E-16 -9.978535748133235E-16 5.926468831336801E-13 1.674475977901975E-14 8.000969027628712E-14 2.749693282374858E-15
q -9.978535748133235E-16 2.773245988847016E-15 -1.530894892814834E-12 -4.599766569074642E-14 -1.974308524361547E-13 -7.422545801556289E-15
tp 5.926468831336801E-13 -1.530894892814834E-12 1.982376783224406E-9 -4.373308694534688E-12 3.554842940769831E-10 -3.232508404392076E-13
node 1.674475977901975E-14 -4.599766569074642E-14 -4.373308694534688E-12 4.52450317179617E-12 -5.585668045609419E-12 4.773267894171519E-13
peri 8.000969027628712E-14 -1.974308524361547E-13 3.554842940769831E-10 -5.585668045609419E-12 6.976625093475261E-11 -6.842096649970269E-13
i 2.749693282374858E-15 -7.422545801556289E-15 -3.232508404392076E-13 4.773267894171519E-13 -6.842096649970269E-13 2.16884069833888E-13

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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

Alternate Designations
 A912 CE = 1944 DP 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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