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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 ]

[ show orbit diagram ]
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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1919-Dec-02 14:47 00:01 Jupiter 1.93689331776329 1.93689288254366 1.93689375298292 4.5928980806835 4.4966757822123 2422295.116008134 1.06554900930153 40.1064962078123 19.3719991781854 84.1375862771361 4383207.66858391 T 38 CATAB v2.0f-lin.ifort 2020-Nov-13 04:17:42 2020-Nov-13 04:17
1943-Dec-16 09:53 00:01 Jupiter 1.92253135615886 1.92253082899026 1.92253188332746 4.35688057748115 4.254556965344 2431074.911517330 1.20252674306131 41.8699891480307 21.8059047133564 77.1291254407402 3454493.60667501 T 38 CATAB v2.0f-lin.ifort 2020-Nov-13 04:17:42 2020-Nov-13 04:17
1967-Jul-21 02:54 00:01 Jupiter 1.98192581298563 1.98192534180922 1.98192628416205 4.60591993462196 4.51217813259652 2439692.620497988 1.05822727630681 39.3986185560674 20.5694675928755 81.8222722128158 3815134.07777605 T 38 CATAB v2.0f-lin.ifort 2020-Nov-13 04:17:42 2020-Nov-13 04:17
2059-Dec-09 20:04 00:01 Jupiter 1.96626207965481 1.96626163179479 1.96626252751482 5.35231915964959 5.27122038202704 2473437.335807499 1.04933264308562 36.8282980503288 20.1879237081398 78.6062498226828 4919697.63556204 T 38 CATAB v2.0f-lin.ifort 2020-Nov-13 04:17:42 2020-Nov-13 04:17
2083-Jun-15 14:36 00:01 Jupiter 1.89756744492392 1.89756689393714 1.8975679959107 5.06622800276931 4.97734071092328 2482026.108260000 1.20326476954103 40.9967399305757 22.3865536946934 68.4160870780491 4129810.26041201 T 38 CATAB v2.0f-lin.ifort 2020-Nov-13 04:17:42 2020-Nov-13 04:17
2107-May-31 03:27 00:01 Jupiter 1.91016071039628 1.91016024648649 1.91016117430619 5.1538572301951 5.06708835520893 2490775.643622094 1.04806706741651 38.1849569124512 20.5619149721147 77.0043921507316 4872140.61133839 T 38 CATAB v2.0f-lin.ifort 2020-Nov-13 04:17:42 2020-Nov-13 04:17
2131-Sep-08 14:10 00:01 Jupiter 1.95631162793572 1.95631121821103 1.9563120376604 5.29010678910427 5.20761861204273 2499642.090192107 1.0481180929037 36.97682536412 19.2409728459114 85.9829623377991 5461142.8155839 T 38 CATAB v2.0f-lin.ifort 2020-Nov-13 04:17:42 2020-Nov-13 04:17
2156-Jan-20 03:11 00:01 Jupiter 1.96549010239413 1.96548968807086 1.96549051671739 5.09152096231647 5.00616532378903 2508541.632555066 1.31874018708616 37.3692003655229 19.3046663042782 -88.9452589104504 4774518.07311223 T 38 CATAB v2.0f-lin.ifort 2020-Nov-13 04:17:42 2020-Nov-13 04:17
2180-Apr-09 17:09 00:02 Jupiter 1.936859136051 1.9368586412249 1.936859630877 4.70827402812696 4.61445654432079 2517388.214767140 1.49635315722839 37.9249742026015 22.2645495099752 89.0700029723513 3407028.31732032 T 38 CATAB v2.0f-lin.ifort 2020-Nov-13 04:17:42 2020-Nov-13 04:17

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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