2009 WV25 Goldstone Radar Observations Planning


Background


2009 WV25 was discovered on Nov 22, 2009 by Catalina Sky Survey.   
2009 WV25 is a small object (~0.05 km plus/minus a factor of two), but it approaches close enough to Earth 
(within 2.9 LD on Dec 01) to be an excellent radar target. Preliminary lightcurve 
measurements hint at an anomalous object, with significant elongation (1 m lightcurve amplitude) 
and unusually long (for its size) rotational period (several hours with a possiblity of non-principal axis rotation). 

2009 WV25 is optically observable until Dec 02 after which it goes too close to the Sun.
We will observe this object in one 90 minute track at Goldstone on Dec 02. 

Orbital and Physical Characteristics  
 orbit type               Apollo
 semimajor axis           1.401 AU     
 eccentricity             0.43
 inclination              0.4       
 perihelion distance      0.803 AU     
 aphelion distance        1.999 AU     
 absolute magnitude (H)   24.0
 diameter                 0.05 km   (plus/minus a factor of two)
 rotation period          3 - 5 hours, possibly in a non-principal axis spin state (Bill Ryan, private comm.)
 pole direction           unknown  
 lightcurve amplitude     1 mag   (Bill Ryan, private comm.)
 spectral class           unknown

Last update: 2009 Dec 02

First MPEC

  M.P.E.C. 2009-W71                                Issued 2009 Nov. 23, 02:08 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.cfa.harvard.edu/iau/mpc.html  ISSN 1523-6714

                                   2009 WV25

Observations:
     K09W25V  C2009 11 22.25176 03 26 30.92 +25 48 35.2          19.3   EW071704
     K09W25V* C2009 11 22.27012 03 26 28.35 +25 49 21.9          18.1 V EW071703
     K09W25V  C2009 11 22.27657 03 26 26.60 +25 49 32.7          18.7   EW071704
     K09W25V  C2009 11 22.27730 03 26 27.09 +25 49 39.0          17.9 V EW071703
     K09W25V  C2009 11 22.28448 03 26 25.94 +25 49 56.0          17.4 V EW071703
     K09W25V  C2009 11 22.28900 03 26 24.40 +25 50 01.7          18.4   EW071704
     K09W25V  C2009 11 22.30143 03 26 22.16 +25 50 31.2          18.9   EW071704
     K09W25V  C2009 11 22.31585 03 26 20.22 +25 51 09.9          18.9 V EW071G96
     K09W25V  C2009 11 22.32154 03 26 19.21 +25 51 23.1          19.0 V EW071G96
     K09W25V  C2009 11 22.32749 03 26 18.13 +25 51 36.8          18.8 V EW071G96
     K09W25V  C2009 11 22.33341 03 26 17.08 +25 51 50.5          18.6 V EW071G96
     K09W25V  C2009 11 22.36286 03 26 11.94 +25 52 57.8          17.9 V EW071G96
     K09W25V  C2009 11 22.36332 03 26 11.86 +25 52 58.9          17.9 V EW071G96
     K09W25V  C2009 11 22.36375 03 26 11.76 +25 52 59.8          17.9 V EW071G96
     K09W25V  C2009 11 22.36420 03 26 11.68 +25 53 01.0          17.9 V EW071G96
     K09W25V  C2009 11 22.41889 03 26 01.33 +25 54 11.5          18.2 R EW071932
     K09W25V  C2009 11 22.42510 03 26 00.52 +25 54 25.1          18.4 R EW071932
     K09W25V  C2009 11 22.46956 03 25 54.54 +25 56 53.8          17.9 R EW071651
     K09W25V  C2009 11 22.47065 03 25 54.37 +25 56 56.3          18.0 R EW071651
     K09W25V  C2009 11 22.47174 03 25 54.21 +25 56 58.6          18.0 R EW071651
     K09W25V  C2009 11 22.85727 03 25 19.58 +26 13 43.0          18.6 C EW071J28
     K09W25V  C2009 11 22.86268 03 25 18.62 +26 13 58.9          18.4 C EW071J28
     K09W25V  C2009 11 22.86809 03 25 17.68 +26 14 14.8          18.4 C EW071J28
     K09W25V  C2009 11 22.86915 03 25 16.41 +26 14 11.7          17.9 R EW071B49
     K09W25V  C2009 11 22.87155 03 25 16.02 +26 14 18.9          17.9 R EW071B49
     K09W25V  C2009 11 22.88479 03 25 13.60 +26 14 57.1          17.5 R EW071B49

Observer details:
651 Grasslands Observatory, Tucson.  Observer J. E. McGaha.  0.62-m f/5.1
    Newtonian reflector + CCD.
703 Catalina Sky Survey.  Observer A. Boattini.  Measurers 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.  0.68-m Schmidt + CCD.
704 Lincoln Laboratory ETS, New Mexico.  Observers M. Bezpalko, D. Torres,
    R. Kracke, G. Spitz, M. Blythe.  Measurer J. Stuart.  1.0-m f/2.15
    reflector + CCD.
932 John J. McCarthy Obs., New Milford.  Observers S. Riley, D. Vill.
    Measurer D. Vill.  0.4-m f/6.5 Schmidt-Cassegrain + CCD.
B49 Paus Observatory, Sabadell.  Observer J. Camarasa.  0.25-m f/4 Newtonian
    reflector + CCD.
G96 Mt. Lemmon Survey.  Observers A. R. Gibbs, S. F. Tornero.  Measurers
    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.
J28 Jaen.  Observer J. J. Martin.  0.20-m f/10 Schmidt-Cassegrain + CCD
    + f/6.3 focal reducer.

Orbital elements:
2009 WV25                                                Earth MOID = 0.0051 AU
Epoch 2010 Jan. 4.0 TT = JDT 2455200.5                  MPC
M 351.36475              (2000.0)            P               Q
n   0.59711319     Peri.  153.86100     -0.73002769     -0.68341430
a   1.3966844      Node   343.02744     +0.62574931     -0.66718133
e   0.4246690      Incl.    0.41433     +0.27476785     -0.29633421
P   1.65           H   23.9           G   0.15           U   9
Residuals in seconds of arc
091122 704  0.6-  1.3+    091122 G96  0.3-  0.1-    091122 651  0.1+  0.1+
091122 703  0.4-  0.4+    091122 G96  0.3-  0.1-    091122 651  0.1+  0.1+
091122 704  0.3+  0.6-    091122 G96  0.1+  0.0     091122 J28  0.3-  0.0
091122 703  0.2-  0.3+    091122 G96  0.1+  0.1+    091122 J28  0.3-  0.1-
091122 703  1.6+  0.1+    091122 G96  0.2-  0.0     091122 J28  0.1+  0.1-
091122 704  0.4+  1.0-    091122 G96  0.2-  0.2+    091122 B49  0.3-  0.1-
091122 704  0.1-  0.7-    091122 932  0.1-  0.1-    091122 B49  0.3+  0.1+
091122 G96  0.1-  0.0     091122 932  0.5-  0.2+    091122 B49  0.4+  0.1+
091122 G96  0.0   0.0     091122 651  0.3+  0.0

Ephemeris:
2009 WV25                a,e,i = 1.40, 0.42, 0                   q = 0.8036
Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase     V
.
.
2009 11 23    03 24.89   +26 21.0    0.0546   1.041   171.0     8.6    18.3
2009 11 24    03 22.25   +27 13.3    0.0483   1.035   169.4    10.1    18.0
2009 11 25    03 18.80   +28 20.6    0.0421   1.028   167.5    12.0    17.8
2009 11 26    03 14.11   +29 50.2    0.0359   1.022   165.1    14.4    17.5
2009 11 27    03 07.29   +31 55.3    0.0298   1.015   162.1    17.4    17.2
2009 11 28    02 56.49   +35 00.9    0.0238   1.009   157.9    21.6    16.8
2009 11 29    02 36.71   +39 59.9    0.0179   1.002   151.3    28.2    16.4
2009 11 30    01 50.08   +48 44.3    0.0125   0.996   139.2    40.3    16.0
2009 12 01    23 02.08   +60 28.6    0.00841  0.989   113.0    66.6    15.8
2009 12 02    18 26.43   +41 13.1    0.00788  0.983    68.4   111.1    17.6
2009 12 03    17 04.53   +15 27.5    0.0115   0.977    38.1   141.5    21.2
2009 12 04    16 35.97   +03 08.3    0.0167   0.971    25.4   154.2    24.3
2009 12 05    16 21.94   -03 08.7    0.0225   0.964    20.0   159.5    26.4

Timothy B. Spahr             (C) Copyright 2009 MPC           M.P.E.C. 2009-W71

SNR Calculation

Target Name:    2009 WV25
HMag:           23.9
Diameter:       0.05 km  (plus/minus a factor of two)
Period:         2.5 h       

                                          Dist.     #    SNR/    SNR/ 
 Start date        UT  window    RA, Dec   AU     runs   date    run
---------------------------------------------------------------------
2009 Nov 29-30     22:30-11:12   23,  51  0.011    700   1350     55
2009 Nov 30-Dec 01 19:35-07:42  339,  61  0.008    700   4410    180
2009 Dec 01-02     15:46-03:10  280,  44  0.008    700   5420    220
2009 Dec 02-03     15:03-01:03  258,  18  0.011    700   1730     70
2009 Dec 03-04     15:02-00:01  250,   4  0.016    666    430     18
2009 Dec 04-05     15:04-23:25  246,  -2  0.021    500    130      6

Goldstone SNRs assume Ptx = 430 kW 

Track Assignments


Goldstone track:

        UT          UT          PST                     Duration  Round-trip
DOY     Date        TX Window   TX Window               hh:mm     time (sec)  SNR/Run 
---     ----        ---------   ---------               --------- -------     -------
336     Dec 02      2200 2330   1400-1530  Dec 02        1:30       11           70  



Uncertainties

From Jon Giorgini, 2009 Dec 02: JPL Solution 18, #obs 188 (Nov 22-Dec-2)
Formal 3-sigma X-band uncertainties during the experiment window:

 Date__(UT)__HR:MN   POS_3sigma   DOP_X_3sig  RT_delay_3sig
 2009-Dec-02 21:00        5.476       732.89       0.017645
 2009-Dec-02 21:30        5.549       738.27       0.017798
 2009-Dec-02 22:00        5.623       743.51       0.017953
 2009-Dec-02 22:30        5.696       748.61       0.018109
 2009-Dec-02 23:00        5.767       753.57       0.018266
 2009-Dec-02 23:30        5.834       758.39       0.018424
 2009-Dec-03 00:00        5.894       763.08       0.018583

From Jon Giorgini, 2009 Dec 01: JPL Solution 16, #obs 171 (Nov 22-Dec-1)
Formal 3-sigma X-band uncertainties during the experiment window:

Date__(UT)   HR:MN   POS_3sigma   DOP_X_3sig  RT_delay_3sig
 2009-Dec-02 21:00        6.125       768.72       0.018504
 2009-Dec-02 21:30        6.199       774.36       0.018665
 2009-Dec-02 22:00        6.274       779.85       0.018827
 2009-Dec-02 22:30        6.348       785.20       0.018990
 2009-Dec-02 23:00        6.419       790.40       0.019155
 2009-Dec-02 23:30        6.486       795.46       0.019320
 2009-Dec-03 00:00        6.545       800.38       0.019487

From Jon Giorgini, 2009 Nov 30: JPL Solution 13, #obs 136 (Nov 22-29)
Formal 3-sigma X-band uncertainties during the experiment window:

Date__(UT)   HR:MN  POS_3sigma   DOP_X_3sig  RT_delay_3sig
 2009-Dec-02 21:00      34.008      1062.62       0.025365
 2009-Dec-02 21:30      33.774      1070.38       0.025583
 2009-Dec-02 22:00      33.541      1077.94       0.025802
 2009-Dec-02 22:30      33.309      1085.30       0.026023
 2009-Dec-02 23:00      33.075      1092.46       0.026246
 2009-Dec-02 23:30      32.839      1099.42       0.026470
 2009-Dec-03 00:00      32.600      1106.18       0.026696


From Jon Giorgini, 2009 Nov 29: JPL Solution 10, #obs: 136  (Nov 22-28)

 Date__(UT)__HR:MN   POS_3sigma  DOP_S_3sig  DOP_X_3sig  RT_delay_3sig
 2009-Nov-30 00:00        6.558      314.72     1125.65       0.028997
 2009-Dec-01 00:00       25.802      169.00      604.46       0.019577
 2009-Dec-02 00:00       45.397      138.25      494.49       0.018387
 2009-Dec-03 00:00       32.238      308.25     1102.51       0.026607
 2009-Dec-04 00:00       22.589      359.33     1285.22       0.038638
 2009-Dec-05 00:00       17.927      378.05     1352.18       0.051914


From Jon Giorgini, 2009 Nov 25: JPL Solution 6, # obs: 67 (Nov 22-25)

 Date__(UT)__HR:MN   POS_3sigma   DOP_X_3sig  RT_delay_3sig
 2009-Nov-30 00:00      257.110      2756.88       0.064604
 2009-Dec-01 00:00      780.666      1519.22       0.044048
 2009-Dec-02 00:00     1118.215      1148.81       0.045099
 2009-Dec-03 00:00      649.810      2646.18       0.076777
 2009-Dec-04 00:00      374.661      3100.84       0.110005
 2009-Dec-05 00:00      248.921      3269.20       0.143424


Apparent Magnitudes and Solar Elongations:

 Date__(UT)__HR:MN     R.A._(J2000.0)_DEC.  APmag            delta    S-O-T /r
 2009-Nov-29 00:00 *m   39.22057  40.03790  16.53 0.01784066734014 151.3248 /T
 2009-Nov-30 00:00 *m   27.37186  48.92406  16.07 0.01241281071286 139.0209 /T
 2009-Dec-01 00:00 *m  343.79461  60.68467  15.96 0.00829494920869 112.1275 /T
 2009-Dec-02 00:00 *   275.23656  40.16416  17.80 0.00790054654431  67.0225 /T
 2009-Dec-03 00:00 *   255.56940  14.69066   n.a. 0.01161849511007  37.2795 /T
 2009-Dec-04 00:00 *   248.66647   2.67424   n.a. 0.01693247945407  24.9317 /L
 2009-Dec-05 00:00 *   245.26061  -3.45922   n.a. 0.02275873563837  19.7939 /L
 2009-Dec-06 00:00 *   243.25228  -7.07001   n.a. 0.02879782328050  17.7780 /L
 2009-Dec-07 00:00 *   241.93839  -9.42830   n.a. 0.03495017094070  17.2456 /L
 2009-Dec-08 00:00 *   241.02040 -11.08564   n.a. 0.04117597953535  17.4485 /L

Setups



Our best estimate for the rotation period of this object is 3 - 5 hours.  If we adopt
5 hours and assume that the diameter is about 50 meters, then the bandwidth
could be about 1 Hz.

The Doppler uncertainties are large so we're going to use a wider bandwidth
than usual (8000 Hz) at the beginning of the observations.

CW setup:
---------------------------------------------------------------------------
TX polarization           RCP
RCV polarization          LCP & RCP
Frequency hops:           2                          
Dwell                     10 seconds                      
Bandwidth:                8000 Hz   <-- NOTE THE BANDWIDTH!
Sampling interval:        1250 x 0.1 usec
VME FFT for PSD files:    16384 for 0.49-Hz resolution 

Due to the short round-trip time we will get less than one complete hop
per run.  

After we get CW echoes we will update the ephemeris, narrow the bandwidth 
and do more CW observations to verify the new solution, and then test the 
chirp system.


Ranging setups:
---------------------------------------------------------------------------
127 x 64 10-usec single sample
baud             10 usec
code            127
gates           127
PRP            1270 usec
FFT              64   
CLT       VME     ?
          PFS     ?
ncoh              4
bandwidth        196.9 Hz   
resolution       3.1 Hz
TXOFF          +50 Hz -> echo will be centered at +16 bins or in bin 32 + 16 = 48
---------------------------------------------------------------------------
127 x 64 11-usec single sample
baud             11 usec
code            127
gates           127
PRP            1397 usec
FFT              64  
CLT       VME     ?
          PFS     ?
ncoh              4
bandwidth        179.0  Hz   
resolution       2.8  Hz
TXOFF          +50 Hz --> echo will be centered at +18 bins or in bin 32 + 18 = 50
-------------------------------------------------------------------------
1-usec single sample
baud              1 usec
code              1023
ncoh              2
bandwidth         488.8  Hz
FFT               128
dfreq             3.8  Hz
TXoff            +50 Hz  (echo in bin 64+13 =77)
-------------------------------------------------------------------------------
0.125-usec 
baud           0.125 usec
code           127  
FFT            256 
ncoh           120
bandwidth      65.6Hz      
resolution     0.26 Hz
TXOFF          +5Hz to put echo at 128 + 19 = bin  147

_____________________________________________________________________
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/data0/2009WV25/raw/

2009 WV25 POINTING:

  OSOD and predicts are on aardvark:

/export/data3/osod/ops/2009wv25/PRDX.s18 
                              /PUNCH.OUT.s18
                              /EPH.OUT.s18


POINTING  
                                                           TX Offsets    
Date (UTC)   DOY  hhmmss    RA        Dec         Macro   LHA     Dec    RTT   OSOD
2009 12 02   336  2200      256.6032  16.1032       A                    11.2
2009 12 02   336  2300      256.1058  15.3423       A     1.50   -2.40   11.4  s18
2009 12 03   336  0000      255.6377  14.6049       A 			 11.6

Transmit offsets are given in millidegrees.  


PRDX.OUT.s18 TRANSMITTER: STATION #14, RECEIVER: STATION #14 RECEIVER U.T. RANGE DOPPLER LHA DEC RA EL 2009 DEC 02 22:00 11.2035135628 -475190.503 28.3833 16.1032 256.603 58.163 2009 DEC 02 22:10 11.2368887359 -477109.426 30.9750 15.9748 256.518 56.223 2009 DEC 02 22:20 11.2703973340 -478997.309 33.5660 15.8470 256.434 54.239 2009 DEC 02 22:30 11.3040371250 -480852.500 36.1561 15.7198 256.351 52.220 2009 DEC 02 22:40 11.3378057591 -482673.400 38.7455 15.5934 256.268 50.171 2009 DEC 02 22:50 11.3717007801 -484458.464 41.3340 15.4675 256.187 48.098 2009 DEC 02 23:00 11.4057196216 -486206.202 43.9218 15.3423 256.106 46.004 2009 DEC 02 23:10 11.4398596189 -487915.187 46.5087 15.2178 256.026 43.893 2009 DEC 02 23:20 11.4741180055 -489584.058 49.0948 15.0939 255.946 41.768 2009 DEC 02 23:30 11.5084919246 -491211.516 51.6800 14.9706 255.868 39.631

2009 WV25 GOLDSTONE MASTERLOG

============================================================================== Receive TX Setup hops dwell code ncoh FFT runs start -stop OSOD offset Poln Notes ------------------------------------------------------------------------------ POINTING TX Offsets Date (UTC) DOY hhmmss RA Dec Macro LHA Dec RTT OSOD
Dr. Lance A. M. Benner | PHONE: (818) 354-7412 Mail Stop 300-233 | FAX: (818) 354-9476 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/2009WV25/2009WV25_planning.html

Asteroid Radar Astronomy