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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 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2400223491300108 3.0948e-08  
a 3.923675434039667 2.1777e-08 au
q 2.981905639137751 1.2758e-07 au
i .8080618967120092 3.5573e-06 deg
node 73.98621132730095 0.00030691 deg
peri 1.733906164999759 0.00030702 deg
M 322.2244058740642 8.6718e-06 deg
tp 2459298.383770788256
(2021-Mar-24.88377079)
6.9424e-05 TDB
period 2838.821200965446
7.77
2.3634e-05
6.471e-08
d
yr
n .1268131997455735 1.0558e-09 deg/d
Q 4.865445228941582 2.7004e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2955  
   data-arc span      28006 days (76.68 yr)  
   first obs. used      1944-02-21  
   last obs. used      2020-10-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47155  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:17:34  

Additional Information
 Earth MOID = 1.99713 au 
 Jupiter MOID = .431467 au 
 T_jup = 3.012 
[ 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 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

[ show close-approach data ]
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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