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1578 Kirkwood (1951 AT)
Classification: Outer Main-belt Asteroid          SPK-ID: 2001578
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2400223489837409 3.0963e-08  
a 3.923675437782786 2.634e-08 au
q 2.981905642556354 1.2842e-07 au
i .8080627447923887 3.6192e-06 deg
node 73.98636914096578 0.00033076 deg
peri 1.733749548672224 0.00033089 deg
M 322.2244040685849 1.1281e-05 deg
tp 2459298.383785451834
(2021-Mar-24.88378545)
9.084e-05 TDB
period 2838.821205027726
7.77
2.8586e-05
7.826e-08
d
yr
n .1268131995641071 1.277e-09 deg/d
Q 4.865445233009218 3.2662e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2733  
   data-arc span      27924 days (76.45 yr)  
   first obs. used      1944-02-21  
   last obs. used      2020-08-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48843  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:36:55  

Additional Information
 Earth MOID = 1.99713 au 
 Jupiter MOID = .431467 au 
 T_jup = 3.012 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456288.5 (2012-Dec-27.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2382541933179939 3.1277e-08  
q 2.995654173048977 1.3028e-07 au
tp 2456467.640800541759
(2013-Jun-24.14080054)
7.698e-05 TDB
node 74.02251963170998 0.00032871 deg
peri 3.079018876408761 0.00032884 deg
i .8110007425152165 3.6244e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2733  
   data-arc span      27924 days (76.45 yr)  
   first obs. used      1944-02-21  
   last obs. used      2020-08-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48843  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:36:55  

Additional Information
 Jupiter MOID = .431467 au 
 T_jup = 3.012 
Orbit Covariance (6×6)
  e q tp node peri i
e 9.782395137713377E-16 -4.029572065577528E-15 -3.832529647285809E-13 -6.783443964312487E-17 -4.596844616795629E-14 -1.463130177037566E-17
q -4.029572065577528E-15 1.697323412249092E-14 1.912881235201678E-12 -1.928772939212885E-15 2.292482544863697E-13 1.497851613812382E-16
tp -3.832529647285809E-13 1.912881235201678E-12 5.925985812049703E-9 -6.699446864377249E-12 7.772021424152315E-10 1.125739252062897E-13
node -6.783443964312487E-17 -1.928772939212885E-15 -6.699446864377249E-12 1.08050248963606E-7 -1.080393488329342E-7 -1.409371925450507E-10
peri -4.596844616795629E-14 2.292482544863697E-13 7.772021424152315E-10 -1.080393488329342E-7 1.081373581432297E-7 1.409367569246687E-10
i -1.463130177037566E-17 1.497851613812382E-16 1.125739252062897E-13 -1.409371925450507E-10 1.409367569246687E-10 1.313652626772337E-11

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 10.2   n/a MPO502168 IRAS observations used: 16
diameter diameter 47.077 km 0.839 urn:nasa:pds:neowise_diameters_albedos::2.0[hildas] (http://adsabs.harvard.edu/abs/2012ApJ...744..197G)  
rotation period rot_per 12.518 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Klinglesmith III, D.A.; Hanowell, J.; Risley, E.; Turk, J.; et al. (2013) Minor Planet Bull. 40, 65-67.]
geometric albedo albedo 0.063   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[hildas] (http://adsabs.harvard.edu/abs/2012ApJ...744..197G)  
B-V BV 0.788   0.040 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=4.91, mean=5.04, max.=5.17) deg.
U-B UB 0.276   0.054 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=4.91, mean=5.04, max.=5.17) deg.
Tholen spectral type spec_T D   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo

1578 Kirkwood (1951 AT)          Discovered 1951-Jan-10 by Goethe Link Observatory at Brooklyn
Discovered by the Indiana Asteroid Program, Goethe Link Observatory, University of Indiana. This program was conceived and directed by F. K. Edmondson; the plates were blinked and measured astrometrically by B. Potter and, following her retirement, by D. Owings; and the photometry was performed under the direction of T. Gehrels. During the years 1947-1967, in which the plates were exposed, a large number of people participated in various aspects of the program.
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1951 AT = 1944 DF = 1949 TF = 1952 FK 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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