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Post Info TOPIC: Comet 107P (4015) Wilson-Harrington
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RE: Comet 107P (4015) Wilson-Harrington
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Orbital Elements at Epoch 2455200.5 (2010-Jan-04.0) TDB
Reference: JPL 66 (heliocentric ecliptic J2000)
Element Value Uncertainty (1-sigma) Units
e .6243335073127657 5.481e-08
a 2.638324044631144 5.5452e-09 AU
q .9911299404189798 1.444e-07 AU
i 2.785414455523398 1.1055e-05 deg
node 270.5507686164209 0.0001636 deg
peri 91.24969176441542 0.00016508 deg
M 17.00989774877483 6.3379e-06 deg
tp 2455126.541204044084
(2009-Oct-22.04120405)		 2.7364e-05 JED
period 1565.274932122817
4.29		 4.9348e-06
1.351e-08		 d
yr
n .2299915450072212 7.2509e-10 deg/d
Q 4.285518148843307 9.0072e-09 AU
 Orbit Determination Parameters
# obs. used (total) 357
data-arc span 21905 days (59.97 yr)
first obs. used 1949-11-19
last obs. used 2009-11-09
planetary ephem. DE405
SB-pert. ephem. SB405-CPV-2
quality code 0
fit RMS .71189
data source ORB
producer Otto Matic
solution date 2009-Nov-10 01:50:29

Additional Information
Earth MOID = .0470723 AU
T_jup = 3.083
Source

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Orbital Elements
Epoch 2009 June 18.0 TT = JDT 2455000.5                 MPC
M 331.00417              (2000.0)            P               Q
n   0.23004263     Peri.   91.25031     +0.99832235     -0.03147896
a   2.6379334      Node   270.55507     +0.00956789     +0.91744867
e   0.6243026      Incl.    2.78557     +0.05710466     +0.39660687
P   4.28           H   15.99          G   0.15           U   1
From 152 observations at 9 oppositions, 1949-2002


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Comet 107P (4015) Wilson-Harrington now at perihelion (0.99 AU)

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Comet Wilson-Harrington closest approach to the  Earth on the 19th November, 2009. (0.379 AU)

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Comet 107P (4015) Wilson-Harrington
Comet Wilson-Harrington is a periodic comet (formally designated 107P/Wilson-Harrington).
Little known about it distinguishes it from other comets, but for the fact that it is also designated an asteroid, 4015 Wilson-Harrington (which, incidentally, is currently the longest asteroid name with 17 characters).

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Asteroid (4015) 1979 VA = Comet 107P/Wilson-Harrington

Ephemeris
Date       UT      R.A. (J2000) Decl.    Delta     r     El.    Ph.   V      
            h m s                                                          
2009 10 02 000000 17 40 37.4 -18 40 34   0.560   1.028   76.6  71.3  17.3    
2009 10 05 000000 17 50 47.5 -18 32 27   0.546   1.018   76.1  72.5  17.3   
2009 10 08 000000 18 01 32.3 -18 21 41   0.532   1.009   75.7  73.6  17.2   
2009 10 11 000000 18 12 53.7 -18 07 52   0.517   1.002   75.5  74.6  17.2    
2009 10 14 000000 18 24 53.9 -17 50 31   0.502   0.997   75.4  75.5  17.1   
2009 10 17 000000 18 37 35.4 -17 29 08   0.488   0.993   75.5  76.2  17.1   
2009 10 20 000000 18 51 00.5 -17 03 07   0.473   0.992   75.7  76.7  17.0    
2009 10 23 000000 19 05 11.4 -16 31 52   0.459   0.991   76.2  77.1  17.0    
2009 10 26 000000 19 20 10.2 -15 54 44   0.445   0.993   76.9  77.3  16.9   
2009 10 29 000000 19 35 58.4 -15 11 05   0.432   0.996   77.8  77.2  16.9    
2009 11 01 000000 19 52 36.9 -14 20 17   0.419   1.000   78.9  76.8  16.8    
2009 11 04 000000 20 10 05.5 -13 21 49   0.408   1.007   80.3  76.2  16.7    
2009 11 07 000000 20 28 22.9 -12 15 17   0.399   1.015   81.9  75.2  16.7    
2009 11 10 000000 20 47 26.0 -11 00 32   0.391   1.024   83.7  74.0  16.6   
2009 11 13 000000 21 07 09.5 -09 37 43   0.385   1.035   85.8  72.5  16.5    
2009 11 16 000000 21 27 26.1 -08 07 24   0.381   1.047   88.0  70.7  16.5    
2009 11 19 000000 21 48 06.0 -06 30 38   0.379   1.061   90.3  68.7  16.4    
2009 11 22 000000 22 08 57.8 -04 48 56   0.380   1.076   92.8  66.5  16.4    
2009 11 25 000000 22 29 49.0 -03 04 10   0.384   1.092   95.3  64.2  16.4    
2009 11 28 000000 22 50 26.8 -01 18 23   0.390   1.109   97.7  61.9  16.4    
2009 12 01 000000 23 10 39.6 +00 26 21   0.400   1.127  100.0  59.5  16.4


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107P (4015) Wilson-Harrington
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Title: Spitzer observations of the asteroid-comet transition object and potential spacecraft target 107P (4015) Wilson-Harrington
Authors: J. Licandro, H. Campins, M. Kelley, Y. Fernandez, M. Delbo, W. T. Reach, O. Groussin, P. L. Lamy, I. Toth, M. F. A'Hearn, J. M. Bauer, S. C. Lowry, A. Fitzsimmons, C. M. Lisse, K. J. Meech, J. Pittichova, C. Snodgrass, H. A. Weaver

Context. Near-Earth asteroid-comet transition object 107P/ (4015) Wilson-Harrington is a possible target of the joint European Space Agency (ESA) and Japanese Aerospace Exploration Agency (JAXA) Marco Polo sample return mission. Physical studies of this object are relevant to this mission, and also to understanding its asteroidal or cometary nature.
Aims. Our aim is to obtain significant new constraints on the surface thermal properties of this object.
Methods. We present mid-infrared photometry in two filters (16 and 22 microns) obtained with NASA's Spitzer Space Telescope on February 12, 2007, and results from the application of the Near Earth Asteroid Thermal Model (NEATM).We obtained high S/N in two mid-IR bands allowing accurate measurements of its thermal emission.
Results. We obtain a well constrained beaming parameter (eta = 1.39 ±0.26) and obtain a diameter and geometric albedo of D = 3.46 ±0.32 km, and pV = 0.059 ±0.011. We also obtain similar results when we apply this best-fitting thermal model to single-band mid-IR photometry reported by Campins et al. (1995), Kraemer et al. (2005) and Reach et al. (2007).
Conclusions. The albedo of 4015 Wilson-Harrington is low, consistent with those of comet nuclei and primitive C-, P-, D-type asteroids. We establish a rough lower limit for the thermal inertia of W-H of 60 Jm^-2s^(-0.5)K^-1 when it is at r=1AU, which is slightly over the limit of 30 Jm^-2s^(-0.5)K-1 derived by Groussin et al. (2009) for the thermal inertia of the nucleus of comet 22P/Kopff.

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