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

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Orbit Diagram
Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet was implemented using 2-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances. For accurate long-term ephemerides, please instead use our Horizons system.

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Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).


Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2388810152410766 3.9113e-08  
a 3.929571512753744 3.3563e-08 AU
q 2.990871480324717 1.5729e-07 AU
i .8093055982978854 4.9542e-06 deg
node 73.9795815006776 0.00041287 deg
peri 2.217139101608933 0.00041296 deg
M 67.95577571546491 1.1252e-05 deg
tp 2456463.418620767325
(2013-Jun-19.91862077)
8.7531e-05 JED
period 2845.222418375864
7.79
3.6452e-05
9.98e-08
d
yr
n .126527893803641 1.621e-09 deg/d
Q 4.868271545182772 4.158e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1490  
   data-arc span      25673 days (70.29 yr)  
   first obs. used      1944-02-21  
   last obs. used      2014-06-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .54241  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jun-16 13:18:02  

Additional Information
 Earth MOID = 2.00578 AU 
 T_jup = 3.012 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 10.26 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 16
diameter diameter 51.88 km 1.8 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 16
rotation period rot_per 12.518 h n/a Asteroid Lightcurve DataBase (Rev. 2014-Mar-01) 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 Bul. 40, 65-67.]
geometric albedo albedo 0.0517   0.004 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 16
B-V BV .788 mag .040 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=2; phase (min.=4.91, mean=5.04, max.=5.17) deg.
U-B UB .276 mag .054 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #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 | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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