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JPL Small-Body Database Browser
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993 Moultona (A923 AB)
Classification: Main-belt Asteroid          SPK-ID: 2000993
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.


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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04855756259384045 3.4169e-08  
a 2.86128644409546 1.0815e-08 au
q 2.722349348487388 9.8613e-08 au
i 1.779831452012372 4.9655e-06 deg
node 184.2542183875291 0.00011183 deg
peri 249.1742936125105 0.00012259 deg
M 354.0313557678435 4.9471e-05 deg
tp 2458629.809851975541
(2019-May-26.30985198)
0.00024293 TDB
period 1767.82972829029
4.84
1.0023e-05
2.744e-08
d
yr
n .2036395215212069 1.1545e-09 deg/d
Q 3.000223539703533 1.134e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2769  
   data-arc span      32176 days (88.09 yr)  
   first obs. used      1931-10-31  
   last obs. used      2019-12-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43486  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-13 20:51:31  

Additional Information
 Earth MOID = 1.73744 au 
 Jupiter MOID = 2.13241 au 
 T_jup = 3.299 
[ 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 11.5   n/a MPO452172  
diameter diameter 12.433 km 1.133 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 5.2712 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Published Reference List:
[Behrend, R. (2014) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.315   0.033 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

993 Moultona (A923 AB)          Discovered 1923-Jan-12 by Van Biesbroeck, G. at Williams Bay
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 A923 AB = 1928 BA = 1960 WD = 1964 PQ = 1967 CN 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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