2003 YE45 Goldstone Radar Observations Planning


Background

2003 YE45 was discovered the Catalina Sky Survey (University of Arizona)
on December 21, 2003.  It will approach within 0.0424 AU (16.5 lunar distances) 
on July 13 and it should be a strong radar target.  

With an absolute magnitude of 17.5, 2003 YE45 has a diameter that is probably
within a factor of two of 1.1 km.  Spectroscopy reported by Michael Hicks (JPL)
indicates that it has an S-class composition (possibly analogous to the ordinary
chondrite meteorites).  Otherwise, we know nothing about its physical properties. 
Given recent experience, there's a a ~1/6 chance that it's a binary system.

Goldstone observations are scheduled on four tracks during July 16-19.

Arecibo observations are scheduled on July 6 and 7 (on the same dates as 2008 BT18), 
so by the time we start  the YE45 observations at Goldstone, we should have a much better
understanding of this object's physical properties.

2003 YE45 will brighten to about 15th magnitude in July 
when it will be a good target for lightcurves and spectroscopy.

Due to its diameter and the proximity of its orbit to Earth, this asteroid has been 
classified as a "Potentially Hazardous Asteroid" by the Minor Planet Center.
Orbital and Physical Characteristics
 orbit type               Apollo
 semimajor axis           1.235 AU     
 eccentricity             0.280        
 inclination             19.0°       
 perihelion distance      0.889 AU     
 aphelion distance        1.581 AU     
 absolute magnitude (H)  17.5
 diameter                 1.1 km +- a factor of two
 rotation period          unknown
 pole direction           unknown
 lightcurve amplitude     unknown
 spectral class           S        (M. D. Hicks, personal communication)

Last update: 2008 June 26

Discovery


M.P.E.C. 2003-Y48                                Issued 2003 Dec. 23, 00:15 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.

         Supported in part by the Steven and Michele Kirsch Foundation
             Prepared using the Tamkin Foundation Computer Network

                              MPC@CFA.HARVARD.EDU
          URL http://cfa-www.harvard.edu/iau/mpc.html  ISSN 1523-6714

                                   2003 YE45

Observations:
     K03Y45E* C2003 12 21.44012 10 48 29.76 -00 14 48.7          19.0 V EY048703
     K03Y45E  C2003 12 21.45381 10 48 31.18 -00 15 23.3          18.9 V EY048703
     K03Y45E  C2003 12 21.46743 10 48 32.63 -00 15 58.7          18.5 V EY048703
     K03Y45E  C2003 12 21.48110 10 48 33.94 -00 16 35.9          19.4 V EY048703
     K03Y45E  C2003 12 22.11419 10 49 42.29 -00 44 44.0                 EY048J95
     K03Y45E  C2003 12 22.12002 10 49 42.93 -00 45 00.7                 EY048J95
     K03Y45E  C2003 12 22.12595 10 49 43.55 -00 45 15.4          18.6 R EY048J95
     K03Y45E  C2003 12 22.28786 10 50 01.16 -00 52 28.2          17.4 R EY048785
     K03Y45E  C2003 12 22.30747 10 50 03.24 -00 53 20.4          17.8 R EY048785
     K03Y45E  C2003 12 22.30968 10 50 03.84 -00 53 24.3          18.6 R EY048854
     K03Y45E  C2003 12 22.31629 10 50 04.48 -00 53 43.5          18.5 R EY048854
     K03Y45E  C2003 12 22.39021 10 50 12.20 -00 57 01.0          18.4   EY048704
     K03Y45E  C2003 12 22.40292 10 50 13.60 -00 57 35.4          18.5   EY048704
     K03Y45E  C2003 12 22.41533 10 50 14.90 -00 58 09.0          18.8   EY048704
     K03Y45E  C2003 12 22.42771 10 50 16.11 -00 58 42.8          18.2   EY048704
     K03Y45E  C2003 12 22.44066 10 50 17.46 -00 59 17.2          18.8   EY048704

Observer details:
703 Catalina Sky Survey.  Observers S. Larson, E. Beshore, E. Christensen,
    R. Hill, S. Kolar, D. McLean.  0.68-m f/1.8 Schmidt + CCD.
704 Lincoln Laboratory ETS, New Mexico.  Observers M. Blythe, F. Shelly,
    M. Bezpalko, R. Huber, L. Manguso, D. Torres, R. Kracke, M. McCleary,
    H. Stange, A. Milner.  Measurers J. Stuart, R. Sayer, J. Evans, J. Kommers.
    1.0-m f/2.15 reflector + CCD.
785 Fitz-Randolph Observatory, Princeton.  Observer J. Maffei.  0.91-m f/13.6
    Cassegrain + CCD.
854 Sabino Canyon Observatory, Tucson.  Observer J. E. McGaha.  0.356-m f/10.0
    Schmidt-Cassegrain + CCD.
J95 Great Shefford.  Observer P. Birtwhistle.  0.30-m f/6.3 Schmidt-Cassegrain
    + CCD.

Orbital elements:
2003 YE45
Epoch 2003 Dec. 7.0 TT = JDT 2452980.5                  MPC
M 278.93205              (2000.0)            P               Q
n   0.64119895     Peri.  291.94129     -0.72888140     +0.60747482
a   1.3319079      Node   286.92517     -0.44006249     -0.76901154
e   0.2539565      Incl.   19.27237     -0.52447774     -0.19898644
P   1.54           H   17.3           G   0.15
From 16 observations 2003 Dec. 21-22.

Ephemeris:
2003 YE45                a,e,i = 1.33, 0.25, 19                  q = 0.9937
Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase     V
2003 12 17    10 40.45   +02 52.8    0.684    1.327   104.0    46.0    18.8
2003 12 27    10 58.41   -04 33.1    0.595    1.289   106.9    46.9    18.5
2004 01 06    11 16.11   -13 32.6    0.518    1.250   108.7    48.2    18.2
2004 01 16    11 34.28   -24 15.1    0.457    1.211   108.8    50.3    17.9
2004 01 26    11 54.17   -36 28.1    0.414    1.172   106.7    53.6    17.7
2004 02 05    12 18.69   -49 26.0    0.389    1.135   102.5    58.0    17.6
2004 02 15    12 55.01   -61 57.9    0.381    1.100    96.9    63.0    17.6
2004 02 25    14 03.7    -72 37.4    0.385    1.069    91.1    67.8    17.8
2004 03 06    16 38.3    -78 50.9    0.396    1.041    85.9    71.8    17.9
2004 03 16    19 48.8    -77 02.8    0.410    1.019    81.7    74.9    18.0
2004 03 26    21 21.3    -70 43.6    0.423    1.004    78.6    77.0    18.1
2004 04 05    22 03.71   -63 27.1    0.433    0.995    76.8    78.2    18.2
2004 04 15    22 28.06   -55 57.0    0.438    0.994    76.2    78.5    18.2
2004 04 25    22 44.58   -48 19.0    0.440    1.001    76.6    78.0    18.2
2004 05 05    22 56.93   -40 31.0    0.437    1.014    78.2    76.8    18.2
2004 05 15    23 06.65   -32 31.0    0.431    1.035    80.9    74.8    18.2
2004 05 25    23 14.02   -24 19.4    0.422    1.060    84.7    72.0    18.1
2004 06 04    23 18.84   -15 56.4    0.411    1.091    89.4    68.4    18.0
2004 06 14    23 20.60   -07 24.6    0.400    1.125    95.2    64.1    17.8
2004 06 24    23 18.28   +01 08.6    0.391    1.161   101.9    58.9    17.7
2004 07 04    23 10.79   +09 29.3    0.384    1.200   109.2    53.1    17.6
2004 07 14    22 57.06   +17 13.2    0.384    1.239   117.0    47.0    17.5
2004 07 24    22 36.57   +23 44.0    0.391    1.278   124.3    41.0    17.4
2004 08 03    22 10.70   +28 24.4    0.408    1.316   130.5    35.9    17.4
2004 08 13    21 42.93   +30 52.7    0.435    1.354   134.4    32.3    17.5
2004 08 23    21 17.94   +31 14.7    0.474    1.390   135.6    30.6    17.7
2004 09 02    20 59.37   +30 03.2    0.524    1.425   134.3    30.4    18.0
2004 09 12    20 48.42   +27 57.7    0.584    1.458   131.1    31.3    18.3
2004 09 22    20 44.69   +25 30.6    0.652    1.489   126.9    32.6    18.6
2004 10 02    20 47.03   +23 04.9    0.728    1.518   122.0    34.0    18.9
2004 10 12    20 54.11   +20 52.9    0.811    1.545   116.9    35.2    19.2
2004 10 22    21 04.92   +19 01.3    0.899    1.569   111.8    36.1    19.5
2004 11 01    21 18.56   +17 33.2    0.991    1.591   106.6    36.7    19.8
2004 11 11    21 34.37   +16 28.7    1.087    1.610   101.5    37.1    20.0
2004 11 21    21 51.89   +15 47.2    1.186    1.626    96.4    37.1    20.2
2004 12 01    22 10.70   +15 27.2    1.286    1.640    91.5    36.9    20.4
2004 12 11    22 30.53   +15 26.4    1.386    1.652    86.6    36.5    20.6
2004 12 21    22 51.21   +15 42.8    1.486    1.660    81.7    35.9    20.7
2004 12 31    23 12.55   +16 13.8    1.585    1.666    77.0    35.1    20.9
2005 01 10    23 34.49   +16 56.9    1.681    1.669    72.3    34.1    21.0
2005 01 20    23 56.97   +17 49.7    1.774    1.670    67.7    33.0    21.0
2005 01 30    00 19.96   +18 49.6    1.863    1.668    63.1    31.8    21.1

Timothy B. Spahr             (C) Copyright 2003 MPC           M.P.E.C. 2003-Y48

SNR Calculation

Target Name:    2003 YE45
HMag:           17.5
Diameter:       1.1  (an educated guess assuming H = 17.5 and an S-class optical albedo)
Period:         4    (a standard guess)

Scheduled tracks are highlighted in bold.

Goldstone:  G =  0.94 K/Jy,  Tsys = 18.0 K,  P = 450 kW,  elev >= 20.00 deg,  unhopped
               UTC                            #           max
 start date    window     RA  dec   dist    runs   SNR  SNR/run
-----------------------------------------------------------------
2008 Jul 05  01:35-21:36  130  -3  0.071    187    130     11
2008 Jul 06  01:48-21:40  132   0  0.065    210    190     14
2008 Jul 07  02:04-21:46  135   4  0.060    238    280     20
2008 Jul 08  02:23-21:54  138   9  0.055    269    410     27
2008 Jul 09  02:46-22:05  141  14  0.050    304    580     36
2008 Jul 10  03:14-22:18  145  21  0.047    342    790     46
2008 Jul 11  03:47-22:36  151  28  0.044    381   1000     56
2008 Jul 12  04:28-23:00  157  36  0.043    416   1200     64
2008 Jul 13  05:18-23:31  166  43  0.043    445   1300     65
2008 Jul 14  06:17-00:11  176  50  0.044    463   1200     60
2008 Jul 15  07:24-01:00  189  55  0.046    467   1000     50
2008 Jul 16  08:35-01:52  202  58  0.049    458    770     39
2008 Jul 17  09:38-02:41  216  60  0.053    435    560     29
2008 Jul 18  10:28-03:22  228  60  0.058    404    400     22
2008 Jul 19  11:03-03:54  237  59  0.064    371    280     16
2008 Jul 20  11:27-04:19  245  58  0.069    339    200     12
2008 Jul 21  11:43-04:37  251  57  0.075    311    140      9


Arecibo:  G = 10.00 K/Jy,  Tsys = 25.0 K,  P = 700 kW,  elev >= 70.31 deg,  unhopped
               UTC                            #           max
 start date    window     RA  dec   dist    runs   SNR  SNR/run
----------------------------------------------------------------
2008 Jul 06  17:47-18:49  133   0  0.065     25   1000    220
2008 Jul 07  17:27-19:20  135   4  0.060     49   2500    390
2008 Jul 08  17:19-19:43  138   9  0.055     67   4100    530
2008 Jul 09  17:20-20:02  141  15  0.050     82   6200    710
2008 Jul 10  17:30-20:18  146  21  0.047     89   8400    920
2008 Jul 11  17:57-20:25  151  29  0.044     83   9700   1100
2008 Jul 12  18:59-20:08  158  37  0.043     39   7165    950

Track Assignments


Goldstone Schedule

         UT        UT       PDT                 Duration  Round-trip
DOY     Date    TX Window   TX Window           hh:mm     time (sec)   
---     ----    ---------   ---------           -------   ---------    
198     Jul 16  0710-0835   0010-0135 Jul 16    01:25      48
199     Jul 17  0445-0935   2145-0235 Jul 16-17 04:50      51
200     Jul 18  0630-1025   2330-0325 Jul 17-18 03:55      56
201     Jul 19  0630-1120   2330-0420 Jul 18-19 05:10      61

On DOY 201, we also have transmit authorization to observe 2005 RC34.
We will decide how to partition the time later.

Arecibo Schedule
188     Jul 06  1747-1849   1047-1149 Jul 06   01:02       65
189     Jul 07  1727-1920   1027-1220 Jul 07   01:53       60    



Uncertainties

From Jon Giorgini, 2008 June 24:
With 290 optical measurements (1989-Sep-12 to 2008-Mar-08),
90403 (2003 YE45) solution #63 was computed. Formal 3-sigma 
S/X-band uncertainties are shown below.

 Date__(UT)__HR:MN   POS_3sigma  DOP_S-sig  DOP_X-sig  RT_delay-sig
 2008-Jul-06 00:00   11.1030793       1.53       5.48      0.003472
 2008-Jul-07 00:00   12.1516443       1.57       5.62      0.003445
 2008-Jul-08 00:00   13.3800033       1.60       5.73      0.003398
 2008-Jul-09 00:00   14.8185951       1.62       5.81      0.003318
 2008-Jul-10 00:00   16.4775349       1.63       5.82      0.003189
 2008-Jul-11 00:00   18.3046791       1.60       5.71      0.002991
 2008-Jul-12 00:00   20.1271726       1.53       5.46      0.002710
 2008-Jul-13 00:00   21.6322463       1.41       5.04      0.002344
 2008-Jul-14 00:00   22.4711167       1.25       4.48      0.001914
 2008-Jul-15 00:00   22.4572028       1.07       3.82      0.001462
 2008-Jul-16 00:00   21.6708031       0.89       3.17      0.001033
 2008-Jul-17 00:00   20.3706821       0.72       2.58      0.000667
 2008-Jul-18 00:00   18.8345951       0.59       2.11      0.000409
 2008-Jul-19 00:00   17.2657801       0.50       1.79      0.000338
 2008-Jul-20 00:00   15.7799670       0.45       1.62      0.000433
 2008-Jul-21 00:00   14.4285507       0.44       1.57      0.000569

Additional optical measurement prior to the radar experiment
is UNLIKELY (until ~July 10+) for this day-time object. 

Setups


The rotation period, diameter, and pole direction of 2003 YE45 are unknown so we don't know what 
bandwdith to expect.  The setup below is a placeholder that we will update after Arecibo observations
on July 6-7.

Initial CW setup
----------------
TX polarization           RCP
RCV polarization          LCP & RCP
Frequency hops:           2
Dwell                    20 seconds
Bandwidth:              4000 Hz  
Sampling interval:      2500 x 0.1 usec 
VME FFT for PSD files:  8192 for 0.49-Hz resolution  


Possible 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              1
bandwidth       787.4 Hz   
resolution       12.3 Hz
TXOFF          +100 Hz -> echo will be centered at +8 bins or in bin 32 + 8 = 40
---------------------------------------------------------------------------
127 x 64 11-usec single sample
baud             11 usec
code            127
gates           127
PRP            1397 usec
FFT              64  
CLT       VME     ?
          PFS     ?
ncoh              1
bandwidth       715.8 Hz   
resolution       11.2 Hz
TXOFF          +100 Hz --> echo will be centered at +9 bins or in bin 32 + 9 = 41
-------------------------------------------------------------------------
127 x 64 7-usec single sample
baud              7 usec
code            127
gates           127
PRP             889
FFT              64
CLT        VME    ?
           PFS    ?
ncoh              1
bandwidth      1124.9 Hz   
resolution       17.6 Hz
TXOFF           +60 -> echo would be centered at +3.4 bins w/perfect ephemeris
-------------------------------------------------------------------------
127 x 64 1-usec single sample
baud            1 usec
code            127
gates           127
PRP             127
FFT             64
CLT             4
ncoh            15
bandwidth       525 Hz   
resolution      8.2 Hz
TXOFF           +100 -> echo would be centered at +12.2 bins  or in bin 32 + 12.2 = 44
-------------------------------------------------------------------------------
0.125-usec ranging 
setup           JX1XS001 revised 
baud              0.125 usec
code            127
gates           127
FFT              64
ncoh            984
bandwidth        64.016384 Hz     
resolution       1.000256 Hz
TXOFF          +15 Hz to put echo at 32 + 15 = bin 47
PFS CLT gate    ?
VME CLT gate    ?

_______________________________________________________________________
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/data0/2003YE45/

2003 YE45 POINTING:

OSOD and predicts are at Goldstone on aardvark:

/export/data3/ops/2003ye45/ PRDX.OUT.s??
                          /PUNCH.OUT.s??
                            /EPH.OUT.s??


POINTING  
                                                  TX Offsets    
Date (UTC)   DOY  hhmmss    RA       Dec   Macro  LHA      Dec      RTT    OSOD


NOT AVAILABLE YET 


Note: in this macro LHA and Dec are given in millidegrees.


PRDX.OUT.s?? TRANSMITTER: STATION #14, RECEIVER: STATION #14 RECEIVER U.T. RANGE DOPPLER LHA DEC RA EL NOT AVAILABLE YET

2003 YE45 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 300-233 | FAX: (818) 354-9476 Jet Propulsion Laboratory | email: lance@reason.jpl.nasa.gov Pasadena, CA 91109-8099 | Plan: To live long and prosper http://echo.jpl.nasa.gov/asteroids/2003YE45/2003YE45_planning.html

Asteroid Radar Astronomy