Goldstone Radar Observations Planning: 2013 SU24


Background


2013 SU24 was discovered by the Catalina Sky Survey on September 29, 2013.  It will approach within
0.13 AU (5.1 lunar distances) on October 5, when it should be a moderately strong radar target.

This object has an absolute magnitude of 24.6, suggesting a diameter within a factor of two of 40 meters.
Lightcurves obtained by Brian Warner, Petr Pravec, and Al Harris indicate that this object is a 
non-principal axis rotator with periods of 0.233 and 0.199 hours.  Warner's photometry also suggests
that this object has a relatively high optical albedo, so its diameter may be smaller than 40 m.
The lightcurves have a substantial amplitude of about 1 magnitude, suggesting that the shape is elongated.
As a result, the X-band bandwidth could vary widely over intervals of only a few minutes.

We have two tracks scheduled to observe this object: Oct. 4 and 6.  

Orbital and Physical Characteristics  
Provisional Designation  2013 SU24
Discoverer               Catalina Sky Survey (Station 703)
Discovery date           2013 Sep 29
orbit type               Apollo        
Close approach dist.     0.013 AU      
Close approach dist.     5.1 LD       
Close approach date      2013 Oct 5

semimajor axis           1.475 AU      
eccentricity             0.331         
inclination              5.4 deg       
perihelion distance      0.987 AU      
aphelion distance        1.963 AU      

absolute magnitude (H)   24.6
diameter                 unknown, but probably 40 meters +- a factor of two
rotation period          0.233 h and 0.199 h, non-principal axis rotator (B. Warner, P. Pravec, & A. W. Harris, pers. comm.)
pole direction           no fixed pole due to NPA spin state
lightcurve amplitude    ~1 mag
spectral class           unknown, but photometry suggests an optically-bright object

Last update: 2013 October 3

FUTURE CLOSE APPROACHES Date (CT) Body CA Dist MinDist MaxDist Vrel TCA3Sg Nsigs P_i/p A.D. 2013 Oct 05.44771 Earth .013192 .013179 .013206 6.009 0.37 1665.5 .000000 A.D. 2017 Nov 07.16029 Mars .056202 .042542 .069775 8.136 370.98 9749.1 .000000 A.D. 2024 Mar 09.77608 Mars .089231 .084461 .115200 6.752 2004.0 1.25E5 .000000 A.D. 2029 Oct 30.90705 Earth .049233 .020752 .090092 5.386 38629. 14944. .000000 NOTE: post-epoch CA list was truncated due to Earth TCA3Sg exceeding the set limit.

Discovery MPECs

M.P.E.C. 2013-S72                                Issued 2013 Sept. 30, 17:59 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.net/    ISSN 1523-6714

                                   2013 SU24

Observations:
     K13S24U* C2013 09 29.30506 23 59 48.48 -16 08 25.3          17.3 VqES072703
     K13S24U  C2013 09 29.31058 23 59 50.47 -16 07 12.0          17.8 VqES072703
     K13S24U  C2013 09 29.31618 23 59 52.46 -16 05 58.3          17.1 VqES072703
     K13S24U  C2013 09 29.32175 23 59 54.45 -16 04 44.8          16.6 VqES072703
     K13S24U  C2013 09 29.36586 00 00 10.66 -15 54 52.8          17.0 VqES072703
     K13S24U  C2013 09 29.37087 00 00 12.59 -15 53 45.7          16.7 VqES072703
     K13S24U  C2013 09 29.37595 00 00 14.59 -15 52 35.3          16.5 VqES072703
     K13S24U  C2013 09 29.38098 00 00 16.44 -15 51 28.6          17.3 VqES072703
     K13S24U KC2013 09 29.39978 00 00 54.51 -15 40 44.3          17.4 VqES072E23
     K13S24U KC2013 09 29.40326 00 00 56.00 -15 39 59.1          17.3 VqES072E23
     K13S24U KC2013 09 29.40672 00 00 57.44 -15 39 13.7          17.7 VqES072E23
     K13S24U KC2013 09 29.41467 00 01 00.81 -15 37 29.9          17.9 VqES072E23
     K13S24U KC2013 09 29.41815 00 01 02.25 -15 36 44.0          17.4 VqES072E23
     K13S24U KC2013 09 29.42162 00 01 03.66 -15 35 58.1          18.0 VqES072E23
     K13S24U KC2013 09 29.44612 00 01 13.65 -15 30 34.3          17.5 VqES072E23
     K13S24U KC2013 09 29.44960 00 01 15.06 -15 29 48.2          17.3 VqES072E23
     K13S24U KC2013 09 29.45307 00 01 16.43 -15 29 01.9          17.2 VqES072E23
     K13S24U `C2013 09 29.52872200 01 49.45 -15 11 47.4          17.2 RqES072D90
     K13S24U `C2013 09 29.53043100 01 50.08 -15 11 23.9          17.3 RqES072D90
     K13S24U `C2013 09 29.53213700 01 50.78 -15 11 00.2          17.5 RqES072D90
     K13S24U `C2013 09 29.53384700 01 51.42 -15 10 37.0          17.5 RqES072D90
     K13S24U `C2013 09 29.53727100 01 52.72 -15 09 49.6          16.8 RqES072D90
     K13S24U 2C2013 09 29.73722 00 03 10.79 -14 21 53.7          18.0  wES072Q62
     K13S24U 2C2013 09 29.74102 00 03 12.56 -14 20 56.1          17.5  wES072Q62
     K13S24U 2C2013 09 29.74219 00 03 13.12 -14 20 38.5          18.1  wES072Q62
     K13S24U KC2013 09 29.84967 00 04 39.23 -14 02 00.3          17.4 RqES072113
     K13S24U KC2013 09 29.85188 00 04 40.26 -14 01 27.7          16.8 RqES072113
     K13S24U KC2013 09 29.85408 00 04 41.29 -14 00 54.9          17.6 RqES072113
     K13S24U KC2013 09 29.85627 00 04 42.28 -14 00 22.6          16.9 RqES072113
     K13S24U KC2013 09 29.85847 00 04 43.27 -13 59 50.1          17.6 RqES072113
     K13S24U KC2013 09 30.09326 00 06 52.44 -12 51 07.4          17.5  uES072I36
     K13S24U KC2013 09 30.09480 00 06 53.12 -12 50 42.4          16.8  uES072I36
     K13S24U KC2013 09 30.09635 00 06 53.83 -12 50 17.8          17.1  uES072I36
     K13S24U |C2013 09 30.11921 00 07 08.75 -12 44 38.3          17.5 VuES072807
     K13S24U |C2013 09 30.12122 00 07 09.63 -12 44 06.1          17.6 VuES072807
     K13S24U |C2013 09 30.12320 00 07 10.51 -12 43 34.4          17.6 VuES072807
     K13S24U |C2013 09 30.12522 00 07 11.40 -12 43 02.0          17.2 VuES072807
     K13S24U |C2013 09 30.12726 00 07 12.31 -12 42 29.3          18.0 VuES072807
     K13S24U |C2013 09 30.12932 00 07 13.20 -12 41 56.3          17.9 VuES072807
     K13S24U  C2013 09 30.23490 00 08 09.46 -12 20 08.6          17.3 RqES072H36
     K13S24U  C2013 09 30.23670 00 08 10.29 -12 19 38.5          16.7 RqES072H36
     K13S24U  C2013 09 30.24060 00 08 12.08 -12 18 33.8          16.5 RqES072H36
     K13S24U  C2013 09 30.24222 00 08 12.82 -12 18 07.1          16.8 RqES072H36
     K13S24U  C2013 09 30.24384 00 08 13.54 -12 17 40.0          17.3 RqES072H36
     K13S24U  C2013 09 30.26235 00 08 27.90 -12 12 00.7          16.7 RcES072854
     K13S24U  C2013 09 30.26284 00 08 28.09 -12 11 51.9          16.8 RcES072854
     K13S24U  C2013 09 30.26333 00 08 28.36 -12 11 44.1          17.1 RcES072854
     K13S24U  C2013 09 30.27079 00 08 31.74 -12 09 35.9          16.4 RoES072926
     K13S24U  C2013 09 30.27257 00 08 32.55 -12 09 06.4          17.3 RoES072926
     K13S24U  C2013 09 30.27426 00 08 33.31 -12 08 38.0          16.0 RoES072926

Observer details:
113 Volkssternwarte Drebach, Schoenbrunn.  Observers G. Lehmann, A. Knoefel,
    J. Kandler.  0.5-m f/4.6 reflector + CCD.
703 Catalina Sky Survey.  Observer R. E. Hill.  Measurers A. Boattini,
    E. J. Christensen, A. R. Gibbs, A. D. Grauer, R. E. Hill, J. A. Johnson,
    R. A. Kowalski, S. M. Larson, F. C. Shelly.  0.68-m Schmidt + CCD.
807 Cerro Tololo.  Observers T. Linder, R. Holmes.  Measurers T. Linder,
    R. Holmes, K. Baker, S. Momaly.  0.41-m f/11 Ritchey-Chretien + CCD.
854 Sabino Canyon Observatory, Tucson.  Observer J. E. McGaha.  0.36-m f/10.0
    Schmidt-Cassegrain + CCD.
926 Tenagra II Observatory.  Observers M. Schwartz, P. R. Holvorcem.  0.81-m
    f/7 Ritchey-Chretien + CCD.
D90 RAS Observatory, Moorook.  Observer K. Hills.  0.41-m f/9 Ritchey-Chretien
    + CCD.
E23 Arcadia.  Observer A. Hidas.  0.35-m Schmidt-Cassegrain + CCD.
H36 Sandlot Observatory, Scranton.  Observer G. Hug.  0.56-m reflector + CCD.
I36 Observatorio Los Campitos, Canuelas.  Observer C. Ambrosioni Prosen.
    0.28-m f/6.3 Schmidt-Cassegrain + CCD.
Q62 iTelescope Observatory, Siding Spring.  Observer M. Urbanik.  Measurers
    M. Urbanik, T. Vorobjov.  0.43-m f/6.8 astrograph + CCD.

Orbital elements:
2013 SU24                                                Earth MOID = 0.0112 AU
Epoch 2013 Nov. 4.0 TT = JDT 2456600.5                  MPC
M   3.88124              (2000.0)            P               Q
n   0.55371823     Peri.   28.72645     +0.78586147     -0.61820793
a   1.4687352      Node     9.50564     +0.54789786     +0.68441177
e   0.3286212      Incl.    5.39068     +0.28675718     +0.38652229
P   1.78           H   24.5           G   0.15           U   6
Residuals in seconds of arc
130929 703  0.2-  0.0     130929 D90  0.3+  0.1-    130930 807  0.1-  0.0
130929 703  0.0   0.5+    130929 D90  0.2-  0.0     130930 807  0.0   0.0
130929 703  0.2-  0.2+    130929 D90  0.3+  0.2+    130930 807  0.0   0.0
130929 703  0.4-  0.1-    130929 D90  0.0   0.1-    130930 807  0.2+  0.0
130929 703  0.5-  0.5+    130929 D90  0.3-  0.2+    130930 807  0.1-  0.1-
130929 703  0.0   0.3-    130929 Q62  0.3-  0.1-    130930 H36  0.0   0.3-
130929 703  1.0+  1.0+    130929 Q62  0.3-  0.1+    130930 H36  0.1+  0.0
130929 703  0.1-  0.8-    130929 Q62  0.1-  0.1+    130930 H36  0.0   0.0
130929 E23  0.2+  0.0     130929 113  0.1-  0.1+    130930 H36  0.0   0.2-
130929 E23  0.3+  0.2-    130929 113  0.1+  0.0     130930 H36  0.4-  0.0
130929 E23  0.0   0.0     130929 113  0.5+  0.2+    130930 854  0.3+  0.0
130929 E23  0.4+  0.4-    130929 113  0.3+  0.0     130930 854  0.2-  0.6+
130929 E23  0.3+  0.2-    130929 113  0.1+  0.2-    130930 854  0.5+  0.3+
130929 E23  0.2-  0.1+    130930 I36  0.1-  0.3-    130930 926  0.2-  0.0
130929 E23  0.3-  0.1-    130930 I36  0.2-  0.2+    130930 926  0.1-  0.3-
130929 E23  0.1-  0.3-    130930 I36  0.2+  0.1+    130930 926  0.1-  0.1-
130929 E23  0.3-  0.2-    130930 807  0.0   0.0

Ephemeris:
2013 SU24                a,e,i = 1.47, 0.33, 5                   q = 0.9861
Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase     V
2013 08 31    23 05 39.7 -33 51 06   0.1328  1.1303   154.0    23.0    21.5
...
2013 09 15    23 14 47.0 -32 59 05   0.07416 1.0705   149.9    28.1    20.2
...
2013 09 23    23 29 12.3 -28 29 10   0.04579 1.0436   150.6    28.2    19.1
...
2013 09 29    23 57 27.3 -17 08 30   0.02612 1.0263   159.7    19.8    17.6
2013 09 30    00 05 52.6 -13 18 22   0.02315 1.0237   163.3    16.3    17.3
2013 10 01    00 16 18.7 -08 20 47   0.02036 1.0212   168.2    11.6    16.8
...
2013 10 07    03 15 37.2 +52 18 26   0.01425 1.0077   124.4    54.9    17.3
...
2013 10 15    08 58 45.0 +57 57 04   0.03535 0.9945    84.5    93.4    20.6
...
2013 10 30    10 10 45.1 +49 10 28   0.08317 0.9863    82.9    92.3    22.3

A. U. Tomatic                (C) Copyright 2013 MPC           M.P.E.C. 2013-S72

SNR Calculations

GOLDSTONE SNRS

D = 40 m,  P = 0.23 h,  OC albedo = 0.1
                                                       SNR/    SNR/
w  DOY start date    window      RA, dec   dist  runs  day     run
40 273 2013 Sep 30  23:43-08:34   5,  -7  0.020   714   40      2
40 274 2013 Oct 01  23:42-08:55   8,   0  0.017   896   73      3
40 275 2013 Oct 02  23:44-09:22  13,  +8  0.015  1121  130      4
40 276 2013 Oct 03  23:50-09:56  19, +20  0.014  1371  200      6   Scheduled
40 277 2013 Oct 05  00:06-10:39  27, +32  0.013  1595  250      7
40 278 2013 Oct 06  00:35-11:32  38, +45  0.013  1729  240      7   Scheduled
41 279 2013 Oct 07  01:22-12:37  54, +55  0.015  1748  190      5
41 280 2013 Oct 08  02:26-13:49  72, +61  0.017  1664  120      3
41 281 2013 Oct 09  03:34-14:54  90, +63  0.019  1504   70      2

Goldstone SNRs assume Ptx = 450 kW and Tsys = 17 K.

- - - - - - - - - - -

ARECIBO SNRS

                                              #     SNR/    SNR/
start date    window       RA, dec   dist   runs    Date    run
2013 Oct 02  03:54-04:42    8,   0  0.017     83     410     47
2013 Oct 03  03:21-05:42   13,  +8  0.015    280    1700    100
2013 Oct 04  03:26-06:15   19, +20  0.014    384    2800    150
2013 Oct 05  04:15-06:20   27, +32  0.013    283    2700    180
These are the only dates when this asteroid is visible at Arecibo.

Arecibo SNRs assume Ptx = 900 kW and Tsys = 23 K.

Track Assignments


277 0430 0600 0800 0830  DSS-14  GSSR   AST 2013 SU24    
279 0555 0725 0900 0930  DSS-14  GSSR   AST 2013 SU24   

2013 SU24 Transmit Authorization:
277     Oct-04-2013     0440Z   0800Z   14     AST 2013 SU24    
(LOCAL Oct 03, 9:40PM TO Oct 04, 01:00AM PDT)

279     Oct-06-2013     0605Z   0900Z   14     AST 2013 SU24   
(LOCAL Oct 05, 11:05PM TO Oct 06, 02:00AM PDT)


      UT       UT          PDT                   Duration Round-trip  SNR/ 
DOY   Date     TX Window   TX Window             hh:mm    time (sec)  Run 
277   Oct 04   0440-0800   2140-0100 Oct 3-4      3:20      14         6
279   Oct 06   0605-0900   2305-0200 Oct 5-6      2:55      13         7


Arecibo tracks:
...None...



Uncertainties

From Jon Giorinig, 2013 Oct 3:
Folding the emailed measurements (102 total) now spanning 
Sep 29 to Oct 3 (21:34), 2013 SU24 orbit solution s6 was 
estimated. Files were updated on aardvark.

Formal 3-sigma X-band uncertainties:

 Date__(UT)__HR:MN  POS_3sigma   DOP_X_3sig  RT_delay_3sig
 2013-Oct-03 00:00       0.632       191.18       0.015777
 2013-Oct-04 00:00       1.074       124.52       0.014186
 2013-Oct-05 00:00       2.412        39.27       0.013358
 2013-Oct-06 00:00       4.215        53.03       0.013429
 2013-Oct-07 00:00       5.770       134.90       0.014381

- - - - - - - - - - - - - - - - - - - -

From Jon Giorgini, 2013 Oct 03:

Based on 88 optical measurements (Sep 29-Oct 02), 2013 SU24 orbit
solution #5 was estimated and updated on aardvark.

Formal 3-sigma X-band uncertainties:

 Date__(UT)__HR:MN  POS_3sigma   DOP_X_3sig  RT_delay_3sig
 2013-Oct-03 00:00       0.952       194.05       0.016045
 2013-Oct-04 00:00       3.011       126.68       0.014422
 2013-Oct-05 00:00       6.893        40.16       0.013575
 2013-Oct-06 00:00      11.783        53.94       0.013644
 2013-Oct-07 00:00      14.943       137.07       0.014610

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

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%
 2013-Oct-03 00:00      11.63349   6.56066 0.01570228187137  16.01 176.2061 /L  151.8/  4.7
 2013-Oct-04 00:00      17.25754  17.17234 0.01411873708069  16.25 165.1823 /L  155.2/  1.3
 2013-Oct-05 00:00      24.84561  29.50230 0.01328299628130  16.53 151.7928 /L  153.0/  0.0
 2013-Oct-06 00:00      35.17791  41.94744 0.01333051411875  16.93 137.5591 /L  146.9/  1.2
 2013-Oct-07 00:00      48.92604  52.31910 0.01424686536872  17.43 124.3880 /L  140.7/  4.7
 2013-Oct-08 00:00      65.72704  59.17446 0.01587726072874  17.98 113.5122 /L  136.5/ 10.6
 2013-Oct-09 00:00      83.29368  62.49571 0.01802449749205  18.52 105.1208 /L  134.6/ 18.6
 2013-Oct-10 00:00      98.70626  63.29659 0.02052307609496  19.01  98.8301 /L  134.5/ 28.3
 2013-Oct-11 00:00     110.67593  62.74561 0.02325656942149  19.44  94.1441 /L  134.9/ 39.2
 2013-Oct-12 00:00     119.52199  61.63256 0.02614826618135  19.82  90.6418 /L  135.0/ 50.6
 2013-Oct-13 00:00     126.04276  60.36192 0.02914817586143  20.16  88.0093 /L  133.9/ 61.9
 2013-Oct-14 00:00     130.93678  59.11085 0.03222324247972  20.45  86.0220 /L  131.2/ 72.6
 2013-Oct-15 00:00     134.70001  57.94688 0.03535102961792  20.70  84.5204 /L  126.8/ 82.0
 2013-Oct-16 00:00     137.66550  56.88909 0.03851582703338  20.93  83.3908 /L  120.9/ 89.8
 2013-Oct-17 00:00     140.05587  55.93640 0.04170626370779  21.13  82.5506 /L  113.8/ 95.4
 2013-Oct-18 00:00     142.02210  55.08013 0.04491382963945  21.30  81.9393 /L  106.0/ 98.9
 2013-Oct-19 00:00     143.66864  54.30944 0.04813194586711  21.46  81.5115 /L   97.7/100.0
 2013-Oct-20 00:00     145.06940  53.61361 0.05135536897755  21.61  81.2331 /L   89.2/ 98.9

Setups


Given the rotation period and size of the asteroid, we are expecting a bandwidth of about 20 Hz.
Due to the spin state and elongated shape inferred from the lightcurves, the bandwidth could vary
dramatically over timescales of only a few minutes.

We're going to start with the following setup, which should produce an echo relatively quickly,
then we'll update the ephemeris, and then do ranging observations.  We'll decide what to do next based on
the SNRs, but we hope to get ranging measurements with at least 1 usec resolution.


CW setup:
---------------------------------------------------------------------------
TX polarization           RCP
RCV polarization          LCP & RCP
Frequency hops:           None: RTT is too short 
TX offset:                +500 Hz
Bandwidth:                4000 Hz 
Sampling interval:        2500 x 0.1 usec
FFT for PFS files:        1024 for 3.91 Hz resolution (to start)

Ranging setups:
---------------------------------------------------------------------------
10-usec
baud             10 usec
code            127
PRP            1270 usec
FFT             128   
ncoh              1 
bandwidth       787 Hz   
resolution      12.3 Hz
TXOFF          +100Hz  (echo in bin 32 + 8 = 40)
---------------------------------------------------------------------------
11-usec 
baud             11 usec
code            127
PRP            1397 usec
FFT              64  
ncoh              1 
bandwidth       716 Hz   
resolution      11.2 Hz
TXOFF          +100 Hz  (echo in bin 32 + 9= 41) 
-------------------------------------------------------------------------
1 usec
baud              1.0 usec
code              511
ncoh              4
FFT               64
bandwidth         489   Hz
resolution        7.6 Hz
TXoff            +50 Hz,  echo is in bin 32+7 =39


Instructions

NOTE: Data should be moved to the appropriate subdirectories in aardvark:/export/data0/2013su24/raw/

2013 SU24 POINTING:

  OSOD and predicts will be on aardvark:

...not available yet...


POINTING  

Date (UTC)  DOY hhmmss  RA        Dec    Macro  LHA    Dec    RTT  OSOD
2013 OCT 04 277 040000  18.6950  19.1378   A   -1.000  1.900  13.9  s6
2013 OCT 04 277 050000  18.9600  19.6468   A   -1.000  2.000  13.8
2013 OCT 04 277 060000  19.2210  20.1571   A   -0.900  1.900  13.8
2013 OCT 04 277 070000  19.4790  20.6676   A   -0.900  1.900  13.7
2013 OCT 04 277 080000  19.7380  21.1777   A   -1.000  1.900  13.7

Offsets are in milidegrees.


PRDX.OUT.14v-14-14.s5 TRANSMITTER: STATION #14, RECEIVER: STATION #14 RECEIVER U.T. RANGE DOPPLER LHA DEC RA EL

2013 SU24 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 183-610 | 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/2013SU24/2013SU24_planning.html

Asteroid Radar Astronomy
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