2013 JR28 Goldstone Radar Observations Planning


Background


2013 JR28 was discovered by the Mt. Lemmon Survey on May 12, 2013.  Its physical characteristics are
effectivley unknown except for its absolute magnitude of 21.5, which suggests a diameter within a factor
of two of about 160 meters. 

This asteroid will approach within 0.0349 AU (13.6 lunar distances) on June 18.  
2013 JR28 should be a moderately strong radar target at Goldstone.  We expect to obtain coarse-resolution
ranging and reduce the orbital uncertainties.

We have one very short track scheduled at Goldstone on June 16.

2013 JR28 will be a good optical target until mid-June when it will become a day-time object. 
We would very much appreciate more optical astrometry and any additional
physical characterization prior to June 16.

2013 JR28  has been classified as a "Potentially Hazardous Asteroid" (PHA) by the IAU's Minor Planet Center.
Orbital and Physical Characteristics  
 orbit type               Apollo
 semimajor axis           2.208 AU
 eccentricity             0.653
 inclination              6.6 deg
 perihelion distance      0.767 AU
 aphelion distance        3.650 AU
 absolute magnitude (H)   21.5
 diameter                 ~160 m (within a factor of two) 
 rotation period          unknown
 pole direction           unknown
 lightcurve amplitude     unknown
 spectral class           unknown 

Last update: 2013 Jun 10

Discovery MPEC

M.P.E.C. 2013-J70                                Issued 2013 May 15, 18:17 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 JR28

Observations:
     K13J28R* C2013 05 12.43344 16 59 05.28 -05 43 56.9          20.4 VuEJ070G96
     K13J28R  C2013 05 12.43947 16 59 05.38 -05 43 52.2          20.4 VuEJ070G96
     K13J28R  C2013 05 12.44553 16 59 05.46 -05 43 47.8          20.1 VuEJ070G96
     K13J28R  C2013 05 12.45153 16 59 05.67 -05 43 41.6          20.7 VuEJ070G96
     K13J28R  C2013 05 12.99147 16 59 22.44 -05 36 11.6          21.3 RoEJ070033
     K13J28R  C2013 05 12.99745 16 59 22.42 -05 36 09.3          21.3 RoEJ070033
     K13J28R  C2013 05 13.03279 16 59 23.23 -05 35 38.3          20.9 RoEJ070033
     K13J28R  C2013 05 13.42451 16 59 34.22 -05 29 57.5          21.3 VuEJ070G96
     K13J28R  C2013 05 13.42520 16 59 34.26 -05 29 57.1          20.3 VuEJ070G96
     K13J28R  C2013 05 13.42645 16 59 34.26 -05 29 55.8          20.4 VuEJ070G96
     K13J28R  C2013 05 13.42714 16 59 34.29 -05 29 55.4          20.6 VuEJ070G96
     K13J28R  C2013 05 13.42839 16 59 34.36 -05 29 53.8          20.4 VuEJ070G96
     K13J28R  C2013 05 13.42909 16 59 34.33 -05 29 53.5          19.9 VuEJ070G96
     K13J28R  C2013 05 13.43032 16 59 34.40 -05 29 52.4          20.4 VuEJ070G96
     K13J28R  C2013 05 13.43101 16 59 34.36 -05 29 51.9          20.1 VuEJ070G96
     K13J28R  C2013 05 14.91798317 00 17.80 -05 07 25.1          21.7 VqEJ070K93
     K13J28R  C2013 05 14.92036117 00 17.86 -05 07 22.9          21.5 VqEJ070K93
     K13J28R  C2013 05 14.92272117 00 17.91 -05 07 20.6          21.4 VqEJ070K93
     K13J28R IC2013 05 14.92508217 00 17.96 -05 07 18.6                qEJ070K93
     K13J28R  C2013 05 14.92744417 00 18.00 -05 07 16.4          21.1 VqEJ070K93
     K13J28R  C2013 05 14.92980417 00 18.05 -05 07 14.6          21.4 VqEJ070K93
     K13J28R  C2013 05 14.93217317 00 18.10 -05 07 12.1          21.5 VqEJ070K93
     K13J28R  C2013 05 14.93453417 00 18.14 -05 07 10.1          21.5 VqEJ070K93
     K13J28R  C2013 05 14.93689817 00 18.18 -05 07 07.9          21.2 VqEJ070K93
     K13J28R  C2013 05 14.93925817 00 18.25 -05 07 05.5          21.3 VqEJ070K93

Observer details:
033 Karl Schwarzschild Observatory, Tautenburg.  Observer B. Stecklum.  1.34-m
    f/4 Schmidt + CCD.
G96 Mt. Lemmon 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, R. H. McNaught, F. C. Shelly.  1.5-m
    reflector + CCD.
K93 Sutherland-LCOGT C.  Observers E. J. Christensen, S. M. Larson, T. Lister.
    Measurer T. Lister.  1.0-m f/8 Ritchey-Chretien + CCD.

Orbital elements:
2013 JR28                                           PHA, Earth MOID = 0.0346 AU
Epoch 2013 Apr. 18.0 TT = JDT 2456400.5                 MPC
M 328.62427              (2000.0)            P               Q
n   0.30034741     Peri.  228.67759     +0.89085899     +0.44091787
a   2.2082765      Node   104.89795     -0.37562499     +0.85034972
e   0.6496533      Incl.    6.49831     -0.25549194     +0.28722254
P   3.28           H   21.4           G   0.15           U   9
Residuals in seconds of arc
130512 G96  0.5+  0.3+    130513 G96  0.3-  0.0     130514 K93  0.1+  0.0
130512 G96  0.0   0.1-    130513 G96  0.1-  0.2-    130514 K93  0.0   0.1+
130512 G96  0.8-  0.8-    130513 G96  0.6+  0.3+    130514 K93  0.0   0.3-
130512 G96  0.3+  0.4+    130513 G96  0.1-  0.0     130514 K93  0.0   0.1+
130512 033  1.6+  1.6+    130513 G96  0.6+  0.0     130514 K93  0.1-  0.1-
130512 033  0.8-  1.2-    130513 G96  0.3-  0.1-    130514 K93  0.2-  0.1-
130513 033  0.9-  0.2-    130514 K93  0.1-  0.0     130514 K93  0.1+  0.2+
130513 G96  0.3-  0.0     130514 K93  0.1+  0.0
130513 G96  0.1+  0.2-    130514 K93  0.1+  0.2+

Ephemeris:
2013 JR28                a,e,i = 2.21, 0.65, 6                   q = 0.7737
Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase     V
2013 04 15    16 40 06.2 -09 55 31   0.7694  1.6335   133.9    26.3    23.1
...
2013 04 30    16 51 52.9 -08 04 31   0.5522  1.4912   144.4    23.2    22.1
...
2013 05 08    16 56 47.0 -06 40 39   0.4475  1.4135   149.6    21.2    21.4
...
2013 05 14    16 59 51.1 -05 21 22   0.3741  1.3546   153.0    19.8    20.9
2013 05 15    17 00 19.4 -05 06 22   0.3622  1.3447   153.5    19.6    20.8
2013 05 16    17 00 47.0 -04 50 46   0.3505  1.3348   153.9    19.4    20.7
...
2013 05 22    17 03 26.1 -03 01 14   0.2826  1.2755   156.0    18.9    20.1
...
2013 05 30    17 07 16.6 +00 36 27   0.1977  1.1965   155.6    20.5    19.3
...
2013 06 14    17 35 55.7 +28 35 08   0.05702 1.0518   128.1    49.4    17.1

A. U. Tomatic                (C) Copyright 2013 MPC           M.P.E.C. 2013-J70


SNR Calculation

2013JR28: 
D = 0.16 km,   (a conservative lower bound)
P = 2.0 h,     (We assumed rapid rotation in order to place a lower bound on the SNRs) 
OC albedo = 0.1

                      UTC                               #      SNR/   SNR/
w  DOY start date     window       RA, dec   dist      runs    date   run
--------------------------------------------------------------------------
24 165 2013 Jun 14    02:15-14:00   266, +34  0.051     436      22     1
24 166 2013 Jun 15    02:00-14:40   269, +42  0.044     536      41     2
25 167 2013 Jun 16    01:40-15:55   275, +53  0.039     679      71     3 
25 168 2013 Jun 17    01:15-19:45   290, +66  0.035     939     110     4
25 169 2013 Jun 18-19 00:20-02:40   341, +77  0.035    1166     130     4    Circumpolar...up continuously for > 24 hours
25 170 2013 Jun 19-20 04:30-01:05    37, +69  0.038    1019      85     3
25 171 2013 Jun 20-21 09:25-00:45    53, +59  0.043     659      47     2
25 172 2013 Jun 21-22 10:50-00:30    60, +51  0.050     514      25     1
 
Goldstone SNRs assume Ptx = 450 kW 

Track Assignments


DOY START BOT  EOT  END FACILITY USER   ACTIVITY 
167 0055 0225 0325 0355  DSS-14  GSSR   AST 2013 JR28

Goldstone tracks:

      UT      UT          PDT                AST                Duration   Round-trip   SNR/
DOY   Date    TX Window   TX Window          TX window          hh:mm      time (sec)   Run 
---   ----    ---------   ---------          ---------          --------   ---------    ----
167   Jun 16  0130-0325   1830-2025 Jun 15   2120-2325 Jun 15    1:55       39.6          3

NOTE: TXON in the table above corresponds to when the elevation reaches 20 degrees


Uncertainties

From Horizons, Solution 14, 2013 Jun 10, # obs: 147 (29 days):

 Date__(UT)__HR:MN     R.A._(J2000.0)_DEC.            delta POS_3sigma  DOP_S_3sig  DOP_X_3sig  RT_delay_3sig
 2013-Jun-14 00:00 *m  264.92079  31.34552 0.05298082070561      5.419      149.91      544.83       0.043586
 2013-Jun-15 00:00 *m  267.75759  39.08894 0.04604841961784      9.196      133.46      485.05       0.038434
 2013-Jun-16 00:00 *m  272.62495  49.12371 0.04032903779725     14.994      110.31      400.92       0.033994
 2013-Jun-17 00:00 *m  282.63838  61.36354 0.03639138871798     22.559       78.61      285.69       0.030560
 2013-Jun-18 00:00 *m  309.94842  73.31532 0.03484246217175     29.629       39.29      142.81       0.028508
 2013-Jun-19 00:00 *m   10.58557  75.21388 0.03599515618650     32.933       27.16       98.72       0.028200
 2013-Jun-20 00:00 *m   43.53676  66.10259 0.03962220519267     31.833       67.45      245.13       0.029732

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

From Horizons, 2013 Jun 04, Solution 7, # obs: 58 (21 days)

 Date__(UT)__HR:MN     R.A._(J2000.0)_DEC.            delta POS_3sigma  DOP_S_3sig  DOP_X_3sig  RT_delay_3sig
 2013-Jun-14 00:00 *m  264.91894  31.34162 0.05299921735600     95.909      429.30     1560.28       0.146946
 2013-Jun-15 00:00 *m  267.75450  39.08311 0.04606501625036    143.330      431.62     1568.69       0.131459
 2013-Jun-16 00:00 *m  272.61905  49.11533 0.04034361662615    209.628      448.40     1629.68       0.115676
 2013-Jun-17 00:00 *m  282.62426  61.35286 0.03640363088767    287.152      472.67     1717.89       0.099475
 2013-Jun-18 00:00 *m  309.90353  73.30705 0.03485212640668    347.565      458.60     1666.77       0.084004
 2013-Jun-19 00:00 *m   10.52975  75.22080 0.03600242002287    359.584      361.45     1313.68       0.072420
 2013-Jun-20 00:00 *m   43.51756  66.11466 0.03962774895876    326.191      230.67      838.35       0.067596

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

JPL/Horizons Solution 2, # obs: 30 (5 days)
2013 May 20

Date__(UT)__HR:MN     R.A._(J2000.0)_DEC.            delta POS_3sigma  DOP_S_3sig  DOP_X_3sig  RT_delay_3sig
 2013-Jun-14 00:00 *m  264.74140  30.75267 0.05399063584957   8531.721     9064.73    32945.35       4.278253
 2013-Jun-15 00:00 *m  267.44921  38.26412 0.04696394063459  11990.299    13210.03    48011.24       3.887200
 2013-Jun-16 00:00 *m  272.02156  48.00643 0.04109911941003  16611.205    19768.42    71847.41       3.308434
 2013-Jun-17 00:00 *m  281.17624  59.99469 0.03694547842720  21763.100    27991.05   101732.16       2.470862
 2013-Jun-18 00:00 *m  305.22919  72.19855 0.03511264779337  25457.017    33919.46   123278.70       1.405745
 2013-Jun-19 00:00 *m    3.86648  75.79686 0.03595989701600  25594.305    32925.12   119664.81       0.590257
 2013-Jun-20 00:00 *m   41.14033  67.33157 0.03932174865025  22529.459    26173.44    95126.16       1.166299

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

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

 Date__(UT)__HR:MN     R.A._(J2000.0)_DEC.  APmag     delta         S-O-T /r     T-O-M/Illu%
 2013-Jun-05 00:00 *   258.00636   5.68327  18.59 0.13392242997672  151.3761 /L  129.2/ 12.5
 2013-Jun-06 00:00 *m  258.29248   6.92056  18.45 0.12421133026070  150.1605 /L  138.0/  6.8
 2013-Jun-07 00:00 *m  258.62565   8.34713  18.30 0.11461163781499  148.7308 /L  144.8/  2.7
 2013-Jun-08 00:00 *m  259.01989  10.01211  18.14 0.10513603768526  147.0421 /L  148.5/  0.5
 2013-Jun-09 00:00 *m  259.49490  11.98214  17.98 0.09580340185603  145.0322 /L  148.2/  0.2
 2013-Jun-10 00:00 *m  260.07929  14.34921  17.81 0.08664194827014  142.6138 /L  144.0/  1.6
 2013-Jun-11 00:00 *m  260.81634  17.24250  17.64 0.07769434623032  139.6621 /L  137.2/  4.9
 2013-Jun-12 00:00 *m  261.77485  20.84589  17.47 0.06902615774838  135.9962 /L  129.1/  9.8
 2013-Jun-13 00:00 *m  263.07123  25.42243  17.31 0.06074000560969  131.3528 /L  120.4/ 16.3
 2013-Jun-14 00:00 *m  264.91894  31.34162  17.16 0.05299921735600  125.3531 /L  112.1/ 24.2
 2013-Jun-15 00:00 *m  267.75450  39.08311  17.07 0.04606501625036  117.4848 /L  104.9/ 33.2
 2013-Jun-16 00:00 *m  272.61905  49.11533  17.08 0.04034361662615  107.1758 /L  100.3/ 43.1
 2013-Jun-17 00:00 *m  282.62426  61.35286  17.30 0.03640363088767   94.1444 /L  100.2/ 53.5
 2013-Jun-18 00:00 *m  309.90353  73.30705  17.83 0.03485212640668   79.1069 /L  105.9/ 64.1
 2013-Jun-19 00:00 *m   10.52975  75.22080  18.72 0.03600242002287   64.0830 /L  116.7/ 74.4
 2013-Jun-20 00:00 *m   43.51756  66.11466   n.a. 0.03962774895876   51.2296 /L  129.7/ 83.7
 2013-Jun-21 00:00 *    55.13126  56.51547   n.a. 0.04514690613386   41.4814 /L  142.2/ 91.4

Setups


We don't know anything about the spin state of 2013 JR28, but if it turns out to be a rapid rotator,
we may see a bandwidth of ~8-10 Hz.
We will start with a relatively coarse Doppler resolution in order to see the echo quickly.

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 
PFS FFT:                  2048 for 1.95 Hz res 

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            127
FFT             512
ncoh             128
bandwidth        61.3 Hz   
resolution       0.12 Hz
TXOFF           +8 Hz -> echo would be centered at 256 + 67=323
-------------------------------------------------------------------------------
0.25-usec ranging 
baud            0.25 usec
code            255
FFT             128
ncoh             16
bandwidth       980  Hz     
resolution       7.7 Hz
TXOFF          +80 Hz -> echo would be centered at 64 + 10 = 74
-------------------------------------------------------------------------------
0.125-usec ranging 
baud            0.125 usec
code            255
FFT             128
ncoh             32
bandwidth       980  Hz     
resolution       7.7 Hz
TXOFF          +80 Hz -> echo would be centered at 64 + 10 = 74

_____________________________________________________________________
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/data0/2013JR28/raw/

2013 JR28 POINTING:

  OSOD and predicts are aardvark:

Monostatic with the new waveform generator:
/export/data3/osod/ops/2013jr28/PRDX.OUT.14v-14-14.s18
                              /PUNCH.OUT.14v-14-14.s18
                              /EPH.OUT.s18

POINTING 
                                                       TX Offsets    
Date (UTC)   DOY  hhmmss    RA        Dec      Macro   LHA     Dec  RTT    OSOD
2013 06 16   167  010000   273.0070  49.6082     A    -3.20   5.30   40.0   s18
2013 06 16   167  020000   273.2972  50.0933     A    -3.30   5.40   38.8
2013 06 16   167  030000   273.5910  50.5829     A    -3.30   5.40   39.6
2013 06 16   167  040000   273.8886  51.0764     A    -3.30   5.40   39.4 
2013 06 16   167  050000   274.1906  51.5729     A    -3.30   5.40   39.2

Transmit offsets are given in millidegrees.  


PRDX.OUT.14f-14-14.s18 RECEIVER U.T. RANGE DOPPLER LHA DEC RA EL 2013 JUN 16 01:00 40.0389658940 493472.574 249.5725 49.6082 273.007 14.903 2013 JUN 16 01:10 40.0044146531 492384.792 252.0312 49.6887 273.055 16.223 2013 JUN 16 01:20 39.9699406482 491268.695 254.4898 49.7693 273.103 17.566 2013 JUN 16 01:30 39.9355458731 490124.133 256.9484 49.8501 273.152 18.930 2013 JUN 16 01:40 39.9012323249 488951.006 259.4068 49.9310 273.200 20.314 2013 JUN 16 01:50 39.8670020064 487749.258 261.8651 50.0121 273.249 21.717 2013 JUN 16 02:00 39.8328569274 486518.887 264.3234 50.0933 273.297 23.137 2013 JUN 16 02:10 39.7987990913 485259.934 266.7815 50.1746 273.346 24.574 2013 JUN 16 02:20 39.7648304985 483972.493 269.2395 50.2560 273.395 26.026 2013 JUN 16 02:30 39.7309531411 482656.703 271.6975 50.3376 273.444 27.492 2013 JUN 16 02:40 39.6971690000 481312.751 274.1553 50.4193 273.493 28.971 2013 JUN 16 02:50 39.6634800428 479940.871 276.6130 50.5010 273.542 30.462 2013 JUN 16 03:00 39.6298882142 478541.343 279.0707 50.5829 273.591 31.963 2013 JUN 16 03:10 39.5963954441 477114.493 281.5282 50.6649 273.640 33.474 2013 JUN 16 03:20 39.5630036334 475660.691 283.9856 50.7470 273.690 34.992 2013 JUN 16 03:30 39.5297146584 474180.352 286.4429 50.8292 273.739 36.518 2013 JUN 16 03:40 39.4965303601 472673.933 288.9001 50.9115 273.789 38.049 2013 JUN 16 03:50 39.4634525527 471141.933 291.3572 50.9939 273.839 39.584 2013 JUN 16 04:00 39.4304830103 469584.892 293.8141 51.0764 273.889 41.123 2013 JUN 16 04:10 39.3976234666 468003.389 296.2710 51.1589 273.939 42.663 2013 JUN 16 04:20 39.3648756147 466398.041 298.7277 51.2416 273.989 44.203 2013 JUN 16 04:30 39.3322411032 464769.504 301.1843 51.3243 274.039 45.742 2013 JUN 16 04:40 39.2997215350 463118.467 303.6407 51.4071 274.089 47.277 2013 JUN 16 04:50 39.2673184620 461445.655 306.0970 51.4900 274.140 48.807 2013 JUN 16 05:00 39.2350333819 459751.825 308.5532 51.5729 274.191 50.331

2013 JR28 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/2013JR28/2013JR28_planning.html

Asteroid Radar Astronomy
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