2010 JK1 Goldstone Radar Observations Planning


Background


2010 JK1 was discovered by the Mt. Lemmon Survey on May 5, 2010.  This object has an unusually low
delta-V for spacecraft missions, and as a result, it's on NASA's official list of objects for 
potential human missions, so there's acute interest in its physical properties and in improving its orbit.

2010 JK1 will approach within 0.0238 AU (9.4 lunar distances) on November 25, 2012. 
Its absolute magnitude of 24.4 suggests a diameter within a factor of two of 40 meters, but 
otherwise we know nothing about this object.  Despite the close approach, we are expecting 
the radar SNRs to be weak and it's possible that we won't even detect it, but due to the 
interest in this object at NASA HQ, we're going to observe it on Nov. 25 and 27.
Observations are also planned at Arecibo on December 2-3.

This object will probably be too faint for lightcurves or spectroscopy, so it's unlikely that 
we'll know the rotation period prior to the radar campaign.  
Orbital and Physical Characteristics  
 orbit type               Apollo
 semimajor axis           1.025 AU     
 eccentricity             0.150
 inclination              0.2 deg       
 perihelion distance      0.872 AU     
 aphelion distance        1.036 AU     
 absolute magnitude (H)   24.4
 diameter                ~40 meters   (within a factor of two)
 rotation period          unknown
 pole direction           unknown
 lightcurve amplitude     unknown
 spectral class           unknown

Last update: 2012 November 24

Discovery MPEC


M.P.E.C. 2010-J25                                Issued 2010 May 6, 16:14 UT

     The Minor Planet Electronic Circulars contain information on unusual
         minor planets and routine data on comets.  They are published
   on behalf of Commission 20 of the International Astronomical Union by the
          Minor Planet Center, Smithsonian Astrophysical Observatory,
                          Cambridge, MA 02138, U.S.A.

             Prepared using the Tamkin Foundation Computer Network

                              MPC@CFA.HARVARD.EDU
       URL http://www.minorplanetcenter.org/iau/mpc.html  ISSN 1523-6714

                                   2010 JK1

Observations:
     K10J01K* C2010 05 05.18574 12 39 33.80 -03 30 46.8          19.9 V EJ025G96
     K10J01K  C2010 05 05.19634 12 39 30.31 -03 30 25.7          21.2 V EJ025G96
     K10J01K  C2010 05 05.20168 12 39 28.54 -03 30 14.9          19.8 V EJ025G96
     K10J01K  C2010 05 05.22294 12 39 21.56 -03 29 32.7          20.3 V EJ025G96
     K10J01K  C2010 05 05.22828 12 39 19.83 -03 29 21.9          20.0 V EJ025G96
     K10J01K  C2010 05 05.23361 12 39 18.07 -03 29 11.0          20.3 V EJ025G96
     K10J01K  C2010 05 05.23905 12 39 16.30 -03 29 00.3          21.1 V EJ025G96
     K10J01K KC2010 05 05.25154 12 39 10.20 -03 28 44.6          20.3 V EJ025H21
     K10J01K KC2010 05 05.25975 12 39 07.65 -03 28 27.6                 EJ025H21
     K10J01K KC2010 05 05.26288 12 39 06.64 -03 28 21.2          20.6 V EJ025H21
     K10J01K  C2010 05 05.28611 12 39 00.90 -03 27 25.4          20.0 V EJ025G96
     K10J01K  C2010 05 05.28905 12 38 59.92 -03 27 19.3          20.1 V EJ025G96
     K10J01K  C2010 05 05.29206 12 38 58.99 -03 27 13.5          20.4 V EJ025G96
     K10J01K  C2010 05 05.29507 12 38 58.02 -03 27 07.1          20.6 V EJ025G96
     K10J01K  C2010 05 05.32929 12 38 47.01 -03 25 57.1          20.8 V EJ025691
     K10J01K  C2010 05 05.33248 12 38 46.02 -03 25 50.9          20.8 V EJ025691
     K10J01K  C2010 05 05.33581 12 38 44.85 -03 25 43.3          20.6 V EJ025691
     K10J01K  C2010 05 06.19009 12 34 41.55 -02 57 03.2          20.1 V EJ025G96
     K10J01K  C2010 05 06.19921 12 34 38.53 -02 56 44.8          20.1 V EJ025G96
     K10J01K  C2010 05 06.20402 12 34 36.91 -02 56 35.0          20.8 V EJ025G96

Observer details:
691 Steward Observatory, Kitt Peak.  Observer T. H. Bressi.  0.9-m f/3
    reflector + CCD.
G96 Mt. Lemmon Survey.  Observer R. E. Hill.  Measurers J. D. Ahern,
    E. C. Beshore, A. Boattini, G. J. Garradd, A. R. Gibbs, A. D. Grauer,
    R. E. Hill, R. A. Kowalski, S. M. Larson, R. H. McNaught.  1.5-m reflector
    + CCD.
H21 Astronomical Research Observatory, Westfield.  Observer R. Holmes.
    Measurers H. Devore, E. Steffen.  0.61-m f/4.5 astrograph + CCD.

Orbital elements:
2010 JK1                                                 Earth MOID = 0.0020 AU
Epoch 2010 July 23.0 TT = JDT 2455400.5                 MPC
M 331.55814              (2000.0)            P               Q
n   0.95751274     Peri.  137.48072     +0.94854458     +0.31664121
a   1.0194666      Node   204.05944     -0.29132229     +0.87115816
e   0.1482033      Incl.    0.17338     -0.12407458     +0.37526231
P   1.03           H   24.4           G   0.15           U   8
Residuals in seconds of arc
100505 G96  0.3-  0.2+    100505 H21  0.7-  0.1-    100505 691  0.3+  0.1-
100505 G96  0.4-  0.1+    100505 H21  0.2+  0.3+    100505 691  0.7+  0.4-
100505 G96  0.6-  0.2+    100505 H21  0.0   0.4+    100505 691  0.9-  0.5+
100505 G96  0.4-  0.2-    100505 G96  0.3+  0.2-    100506 G96  0.1+  0.0
100505 G96  0.0   0.1-    100505 G96  0.1-  0.0     100506 G96  0.1+  0.0
100505 G96  0.1-  0.1+    100505 G96  0.6+  0.3-    100506 G96  0.3-  0.0
100505 G96  0.2+  0.2-    100505 G96  0.7+  0.0

Ephemeris:
2010 JK1                 a,e,i = 1.02, 0.15, 0                   q = 0.8684
Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase     V
2010 05 04    12 45.24   -04 09.0    0.0810   1.078   148.7    29.0    20.4
2010 05 14    11 56.52   +01 31.2    0.0740   1.055   125.6    51.1    20.8
2010 05 24    11 09.55   +06 55.8    0.0712   1.031   103.1    73.0    21.3
2010 06 03    10 23.46   +11 53.0    0.0704   1.006    81.1    94.9    22.0
2010 06 13    09 33.30   +16 32.2    0.0712   0.980    58.6   117.9    23.3

Sonia Keys                   (C) Copyright 2010 MPC           M.P.E.C. 2010-J25

SNR Calculation

Target Name:   2010 JK1

D         = 0.04 km  
Period    = 0.5 h    (A standard guess)
OC albedo = 0.1      (A relatively conservative lower bound)
    
2010JK1:  D = 0.04 km,  P = 0.5000 hr,  OC albedo = 0.100,  subradar lat = 0.0 deg

week DOY  start date    window        RA, dec   dist    runs   SNR  SNR/run
 47  325  2012 Nov 20  21:20-02:45   304, -23  0.028    262     11      1
 47  326  2012 Nov 21  21:35-03:15   310, -22  0.027    286     14      1
 47  327  2012 Nov 22  21:50-03:50   317, -20  0.025    312     17      1
 47  328  2012 Nov 23  22:05-04:25   325, -18  0.024    339     21      1
 47  329  2012 Nov 24  22:20-05:05   332, -16  0.024    365     24      1
 47  330  2012 Nov 25  22:35-05:40   340, -13  0.024    388     25      1
 48  331  2012 Nov 26  22:45-06:20   347, -10  0.024    405     25      1
 48  332  2012 Nov 27  23:00-06:50   354,  -8  0.025    415     23      1
 48  333  2012 Nov 28  23:10-07:20   360,  -5  0.026    418     20      1
 48  334  2012 Nov 29  23:20-07:50     5,  -2  0.028    415     17      1
 48  335  2012 Nov 30  23:30-08:10    10,   0  0.029    408     14      1
 48  336  2012 Dec 01  23:35-08:30    15,   2  0.031    398     11      1

Goldstone SNRs assume Ptx = 450 kW  and Tsys = 15 K, which are somewhat optimistic

Arecibo SNRs:
                                             #           max
 start date    window     RA, dec   dist    runs   SNR  SNR/run
2012 Nov 30  23:58-00:53  10,   0  0.029     43     73     12
2012 Dec 01  23:55-01:24  14,   2  0.031     66     84     11
2012 Dec 02  23:57-01:45  18,   4  0.033     76     80     10
2012 Dec 04  00:00-02:02  22,   5  0.036     81     67      8
2012 Dec 05  00:04-02:15  25,   7  0.038     83     55      6
2012 Dec 06  00:07-02:25  27,   8  0.041     83     44      5
2012 Dec 07  00:10-02:33  30,   9  0.043     82     35      4
2012 Dec 08  00:13-02:40  32,  10  0.046     80     28      3
2012 Dec 09  00:15-02:45  34,  11  0.049     78     23      3
2012 Dec 10  00:17-02:50  36,  11  0.052     75     18      2
2012 Dec 11  00:18-02:53  37,  12  0.055     73     15      2

Arecibo SNRs assume Ptx = 900 kW

Track Assignments


Goldstone tracks:

*DAY START BOT  EOT  END FACILITY USER   ACTIVITY         
 330 0140 0310 0505 0535  DSS-14  GSSR   AST 2010 JK1 
 332 0350 0520 0730 0800  DSS-14  GSSR   JK1/EUROPA/GANY


        UT         UT          PDT                 Duration   Round-trip     
DOY     Date       TX Window   TX Window           hh:mm      time (sec)   SNR/Run 
---     ----       ---------   ---------           ---------  ---------    -------
330     Nov 25     0155-0505   1755-2105 Nov 24     3:10        24           1
332     Nov 27     0405-0730   2005-2330 Nov 26     3:25        24           1       Overlaps Europa/Ganymede (J. L. Margot, PI)

Start times are only 15 minutes into precal. 

On DOY 332, we plan to start with 2010 JK1 and then switch to the Galilean 
satellites with enough time to reconfigure to capture the "magic moment."

Jupiter is up from 0245-1324, so both 2010 JK1 and the Gailean satellites will be in the beam
for the entire track on Nov. 27.

We may devote a fraction of the time to test DSS-13 using the Moon as a target.
Lunar rise-set times on November 25 and 27:
        Rise Set
Nov 25  0003-1009
Nov 27  0117-1156
Thus, the Moon will be up during the entirety of both 2010 JK1 tracks.

In addition, the times scheduled for 2010 JK1 also overlap times when 4179 Toutatis will be visible:
330     Nov 25  0140-0320 
There's no overlap between 2010 JK1 and Toutatis on Nov. 27.


Requested Arecibo tracks:

        UT         UT          AST                PDT               Duration   Round-trip     
DOY     Date       TX Window   TX Window          TX Window         hh:mm      time (sec)    SNR/Run 
---     ----       ---------   ---------          ---------         ---------  ---------     -------
336     Dec 01-02  2355-0124   1955-2124  Dec 1   1555-1824 Dec 1    1:29        31           11
337     Dec 02-03  2357-0145   1957-2145  Dec 2   1557-1845 Dec 2    1:48        33           10



Uncertainties

From Jon Giorgini, 2012 Nov 24:
Including the 3 measurements e-mailed by R. McNaught, 2010 JK1
orbit solution #15 was estimated based on 61 optical measurements
(2010-Apr-10 to 2012-Nov-24) and OSOD with nominal predicts
was established on aardvark in the /2010jk1 sub-directory.

The  E12 measurements differed by ~114" from the prediction of s12.

S15 formal 3-sigma X-band uncertainties:

Date__(UT)__HR:MN   POS_3sigma   DOP_X_3sig  RT_delay_3sig
2012-Nov-24 00:00        1.442         1.82       0.002124
2012-Nov-25 00:00        1.788         2.41       0.002118
2012-Nov-26 00:00        3.728         5.14       0.002083
2012-Nov-27 00:00        5.692         7.77       0.002020

From Horizons, 2012 Sep 27, Solution #12, #obs = 58 (2010-2012):

 Date__(UT)__HR:MN     R.A._(J2000.0)_DEC.            delta POS_3sigma  DOP_S_3sig  DOP_X_3sig  RT_delay_3sig
 2012-Nov-15 00:00 *m  277.98702 -25.08636 0.04130491226462    212.638       97.63      354.83       0.196121
 2012-Nov-16 00:00 *m  281.11534 -25.09529 0.03872619325580    196.027       93.54      339.95       0.192850
 2012-Nov-17 00:00 *m  284.64675 -25.02770 0.03625692978910    171.938       90.91      330.42       0.189684
 2012-Nov-18 00:00 *m  288.64025 -24.85172 0.03391661908454    138.725       90.70      329.66       0.186542
 2012-Nov-19 00:00 *m  293.15487 -24.52518 0.03172967376338     96.391       94.20      342.36       0.183301
 2012-Nov-20 00:00 *m  298.24196 -23.99453 0.02972612285209     59.559      102.99      374.30       0.179783
 2012-Nov-21 00:00 *m  303.93259 -23.19633 0.02794192798661     93.531      118.75      431.60       0.175746
 2012-Nov-22 00:00 *m  310.22045 -22.06336 0.02641842594536    186.272      142.68      518.57       0.170891
 2012-Nov-23 00:00 *m  317.04338 -20.53801 0.02520023952994    303.968      174.50      634.22       0.164903
 2012-Nov-24 00:00 *m  324.27115 -18.59236 0.02433108620094    434.605      211.36      768.18       0.157531
 2012-Nov-25 00:00 *m  331.70963 -16.24926 0.02384756476025    565.646      247.43      899.29       0.148696
 2012-Nov-26 00:00 *m  339.12682 -13.59227 0.02377226562628    682.818      275.22     1000.26       0.138586
 2012-Nov-27 00:00 *m  346.29438 -10.75407 0.02410872811446    773.703      288.35     1047.99       0.127668
 2012-Nov-28 00:00 *   353.02758  -7.88535 0.02484060016746    831.511      284.30     1033.29       0.116577
 2012-Nov-29 00:00 *   359.20780  -5.11976 0.02593543255524    856.321      264.94      962.91       0.105953
 2012-Nov-30 00:00 *     4.78339  -2.55144 0.02735125873667    853.395      234.90      853.74       0.096300

**********************************************************************************************

Apparent Magnitudes, Solar Elongations, Lunar Elongations, and Lunar Illumination:

 Date__(UT)__HR:MN     R.A._(J2000.0)_DEC.            delta  APmag    S-O-T /r  T-O-M/Illu%
 2012-Nov-15 00:00     278.00479 -25.03624 0.04132423233204   n.a.  44.4323 /T   29.3/  1.8
 2012-Nov-16 00:00     281.13228 -25.04156 0.03874588182243   n.a.  46.2574 /T   17.4/  6.5
 2012-Nov-17 00:00     284.66224 -24.97007 0.03627705089396   n.a.  48.4486 /T  7.760/ 13.7
 2012-Nov-18 00:00     288.65347 -24.78993 0.03393723519593   n.a.  51.0650 /T  8.939/ 22.7
 2012-Nov-19 00:00     293.16479 -24.45906 0.03175083943219   n.a.  54.1704 /T   17.5/ 33.0
 2012-Nov-20 00:00     298.24728 -23.92414 0.02974787486997   n.a.  57.8283 /T   26.1/ 43.7
 2012-Nov-21 00:00     303.93185 -23.12200 0.02796427152801  21.19  62.0927 /T   33.8/ 54.3
 2012-Nov-22 00:00     310.21217 -21.98587 0.02644131752279  20.76  66.9937 /T   40.6/ 64.4
 2012-Nov-23 00:00     317.02628 -20.45862 0.02522357035057  20.34  72.5174 /T   46.5/ 73.7
 2012-Nov-24 00:00     324.24456 -18.51277 0.02435467318529  19.95  78.5856 /T   51.6/ 81.9
 2012-Nov-25 00:00     331.67372 -16.17139 0.02387115841726  19.62  85.0440 /T   56.1/ 88.7
 2012-Nov-26 00:00     339.08267 -13.51789 0.02379557991956  19.34  91.6719 /T   60.3/ 94.0
 2012-Nov-27 00:00     346.24377 -10.68449 0.02413148636779  19.13  98.2160 /T   64.5/ 97.7
 2012-Nov-28 00:00     352.97262  -7.82123 0.02486258019456  18.98 104.4387 /T   68.9/ 99.7
 2012-Nov-29 00:00     359.15053  -5.06119 0.02595649394841  18.90 110.1600 /T   73.9/ 99.9
 2012-Nov-30 00:00       4.72550  -2.49813 0.02737134628958  18.86 115.2752 /T   79.5/ 98.3
 2012-Dec-01 00:00       9.69848  -0.18198 0.02906241177534  18.86 119.7500 /T   85.7/ 95.0
 2012-Dec-02 00:00      14.10481   1.87312 0.03098707630993  18.89 123.6015 /T   92.8/ 90.0
 2012-Dec-03 00:00      17.99785   3.67667 0.03310760524663  18.95 126.8774 /T  100.5/ 83.6
 2012-Dec-04 00:00      21.43719   5.25083 0.03539214071635  19.02 129.6396 /T  108.9/ 75.7
 2012-Dec-05 00:00      24.48156   6.62272 0.03781459937818  19.10 131.9526 /T  117.9/ 66.8

Setups


We're going to start with the CW setup below, and if the echoes turn out to be stronger
than expected, we'll switch to 10 usec and 11 usec ranging.


TX polarization           RCP
RCV polarization          LCP & RCP
Frequency hops:           no hops
Bandwidth:                4000 Hz 
Sampling interval:        2500 x 0.1 usec
VME FFT for PSD files:    4096 for 0.98-Hz resolution 

Ranging setups:
---------------------------------------------------------------------------
10-usec
baud             10 usec
code            127
PRP            1270 usec
FFT             128   
ncoh              1 
bandwidth       787 Hz   
resolution      6.15 Hz
TXOFF          +100Hz  (echo in bin 64+16=80)
---------------------------------------------------------------------------
11-usec 
baud             11 usec
code            127
PRP            1397 usec
FFT             128  
ncoh              1 
bandwidth       716 Hz   
resolution      5.6 Hz
TXOFF          +100 Hz  (echo in bin 64+18=82) 
-------------------------------------------------------------------------
1-usec 
baud            1 usec
code            255
FFT             256
ncoh             6
bandwidth        653.6 Hz   
resolution       2.55 Hz
TXOFF           +50 Hz -> echo would be centered at 128 + 20 = 148
-------------------------------------------------------------------------
0.125-usec imaging
baud            0.125 usec
code            511
FFT             1024
ncoh            150 
bandwidth       104.4  Hz     
resolution      0.1 Hz
TXOFF          +10 Hz -> echo would be centered at 512 + 98 = 610

_____________________________________________________________________
POSSIBLE RANGING SETUPS: (code=127, FFT=64, single-pol'n) 
   These are from JX, w/ max-band (min-acc) options from Ray Jurgens.
   Currently configured for 5-sec records.
_______________________________________________________________________
 Setup        Baud        RP         1-acc 1-acc      
            usec   m      usec        band   res    acc  band     res 
_______________________________________________________________________
 
JX1XS110  11.000 1650    1397.0      715.8  11.2      2   358     5.6
JX1XS070   7.000 1050     889.0     1124.9  17.6      3   375     5.9
                                                      
JX1XS020   2.000  300     254.0     3937.0  61.5     12   328     5.1
                                                      4   984    15.4 

JX1XS010   1.000  150     127.0     7874.0 123.0     41   192     3.0 
                                                      8   984    15.4 

JX1XS005   0.500   75      63.5    15748.0 246.1    123   128     2.0 
                                                     15  1050    16.4 

JX1XS002   0.250   37.5    31.75   31496.1 492.1    492    64     1.0
                                                     30  1050    16.4 
 
JX1XS001   0.125   18.75   15.875  62992.1 984.3   1970    32     0.5 
                                                     60  1050    16.4 
____________________________________________________________________


Instructions

NOTE: Data should be moved to the appropriate subdirectories in aardvark:/export/data0/2010JK1/raw/

2010 JK1 POINTING:

  OSOD and predicts are on aardvark 

WFG:
/export/data3/osod/ops/2010jk1/PRDX.OUT.14v-14-14.s15
                              /PUNCH.OUT.14v-14-14.s15
                              /EPH.OUT.s15


POINTING  
                                                          TX Offsets    
Date (UTC)   DOY  hhmmss    RA        Dec         Macro   LHA     Dec    RTT    OSOD
2012 11 25   330  020000   332.5032 -15.9671        A                    23.7   s15 
2012 11 25   330  030000   332.7922 -15.8592        A                    23.7 
2012 11 25   330  040000   333.0830 -15.7494        A    -1.90   0.70    23.7   
2012 11 25   330  050000   333.3770 -15.6379        A                    23.7 
2012 11 25   330  060000   333.6752 -15.5249        A                    23.7 

Transmit offsets are given in millidegrees.  


PRDX.OUT.14f-14-14.s15 TRANSMITTER: STATION #14, RECEIVER: STATION #14 RECEIVER U.T. RANGE DOPPLER LHA DEC RA EL 2012 NOV 25 02:00 23.7382823133 22637.546 5.0323 -15.9671 332.503 38.386 2012 NOV 25 02:10 23.7367359995 21484.595 7.4910 -15.9492 332.551 38.136 2012 NOV 25 02:20 23.7352703489 20336.225 9.9498 -15.9313 332.599 37.783 2012 NOV 25 02:30 23.7338849843 19194.035 12.4085 -15.9134 332.648 37.330 2012 NOV 25 02:40 23.7325794168 18059.613 14.8671 -15.8954 332.696 36.778 2012 NOV 25 02:50 23.7313530469 16934.530 17.3258 -15.8773 332.744 36.131 2012 NOV 25 03:00 23.7302051653 15820.343 19.7844 -15.8592 332.792 35.393 2012 NOV 25 03:10 23.7291349546 14718.586 22.2429 -15.8410 332.840 34.566 2012 NOV 25 03:20 23.7281414823 13630.772 24.7014 -15.8228 332.889 33.656 2012 NOV 25 03:30 23.7272237351 12558.387 27.1598 -15.8045 332.937 32.666 2012 NOV 25 03:40 23.7263805723 11502.889 29.6182 -15.7862 332.986 31.600 2012 NOV 25 03:50 23.7256107521 10465.704 32.0764 -15.7678 333.034 30.462 2012 NOV 25 04:00 23.7249129581 9448.226 34.5346 -15.7494 333.083 29.258 2012 NOV 25 04:10 23.7242857453 8451.810 36.9927 -15.7309 333.132 27.990 2012 NOV 25 04:20 23.7237275992 7477.773 39.4507 -15.7124 333.181 26.662 2012 NOV 25 04:30 23.7232369064 6527.391 41.9086 -15.6938 333.230 25.279 2012 NOV 25 04:40 23.7228119655 5601.896 44.3664 -15.6752 333.279 23.845 2012 NOV 25 04:50 23.7224509903 4702.473 46.8241 -15.6566 333.328 22.361 2012 NOV 25 05:00 23.7221521057 3830.259 49.2817 -15.6379 333.377 20.833 2012 NOV 25 05:10 23.7219133741 2986.341 51.7392 -15.6191 333.426 19.263 2012 NOV 25 05:20 23.7217327759 2171.754 54.1965 -15.6004 333.476 17.653 2012 NOV 25 05:30 23.7216082208 1387.477 56.6537 -15.5816 333.525 16.008 2012 NOV 25 05:40 23.7215375434 634.435 59.1108 -15.5627 333.575 14.329 2012 NOV 25 05:50 23.7215185320 -86.505 61.5677 -15.5439 333.625 12.618 2012 NOV 25 06:00 23.7215489002 -774.538 64.0246 -15.5249 333.675 10.879

2010 JK1 GOLDSTONE MASTERLOG

============================================================================== Receive TX Setup hops dwell code ncoh FFT runs start -stop OSOD offset Poln Notes ------------------------------------------------------------------------------
Dr. Lance A. M. Benner | PHONE: (818) 354-7412 Mail Stop 183-601 | FAX: (818) 393-4445 Jet Propulsion Laboratory | email: lance.benner@jpl.nasa.gov California Institute of Technology | Plan: To live long and prosper Pasadena, CA 91109-8099 http://echo.jpl.nasa.gov/asteroids/2010JK1/2010JK1_planning.html

Asteroid Radar Astronomy
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