2012 BX34 Goldstone Radar Observations Planning
2012 BX34 was discovered by the Catalina Sky Survey on January 25, 2012, and it will make a very close approach within 0.17 lunar distances (0.0004 AU) on January 27. We are planning to observe it on Jan. 27 using time previously scheduled for observations of 433 Eros. The absolute magnitude of 27.5 suggests a diameter within a factor of two of about 10 meters, but otherwise nothing is known about its physcial properties. 2012 BX34 will be a strong radar target at Goldstone and we hope to obtain 3.75-meter-resolution images using the chirp system and digital receiver. During the time we have scheduled, the round-trip light travel time will shrink from 2.0 to 1.3 seconds as the asteroid approaches. Closest approach occurs several hours after the track ends. Due to the very short round-trip times, we will transmit at DSS-14 and receive at DSS-13. The pointing uncertainties have improved sufficiently to observe this asteroid. At least one additional update to the solution is possible before the track starts. The Doppler uncertainties are large so we're going to use a wider bandwidth than usual for CW observations.
Orbital and Physical Characteristics orbit type Aten semimajor axis 0.799 AU eccentricity 0.311 inclination 12.0 deg perihelion distance 0.551 AU aphelion distance 1.048 AU absolute magnitude (H) 27.5 diameter 10 m (within a factor of two) rotation period unknown pole direction unknown lightcurve amplitude unknown spectral class unknown Last update: 2013 Feb 01
M.P.E.C. 2012-B62 Issued 2012 Jan. 26, 15:27 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
2012 BX34
Observations:
K12B34X* C2012 01 25.43154 12 22 57.00 +33 46 05.1 19.9 VrEB062703
K12B34X C2012 01 25.43996 12 22 54.98 +33 45 40.1 20.4 VrEB062703
K12B34X C2012 01 25.44845 12 22 52.86 +33 45 13.3 19.7 VrEB062703
K12B34X C2012 01 25.45697 12 22 50.91 +33 44 48.3 19.8 VrEB062703
K12B34X C2012 01 26.49752 12 24 34.02 +31 46 12.9 18.4 VrEB062G96
K12B34X C2012 01 26.50273 12 24 32.04 +31 45 01.7 18.6 VrEB062G96
K12B34X C2012 01 26.50796 12 24 30.02 +31 43 49.2 18.3 VrEB062G96
K12B34X C2012 01 26.51318 12 24 28.04 +31 42 34.9 18.4 VrEB062G96
K12B34X C2012 01 26.53182 12 24 16.05 +31 37 06.8 18.2 RoEB062H01
K12B34X C2012 01 26.54052 12 24 13.00 +31 34 50.3 18.4 RoEB062H01
K12B34X C2012 01 26.54182 12 24 17.20 +31 35 25.2 18.3 VrEB062703
K12B34X C2012 01 26.54346 12 24 16.56 +31 34 59.3 18.6 VrEB062703
K12B34X C2012 01 26.54374 12 24 16.59 +31 34 54.5 18.0 VrEB062G96
K12B34X C2012 01 26.54432 12 24 16.41 +31 34 45.4 17.8 VrEB062G96
K12B34X C2012 01 26.54487 12 24 16.20 +31 34 36.6 17.9 VrEB062G96
K12B34X C2012 01 26.54517 12 24 15.94 +31 34 31.7 18.4 VrEB062703
K12B34X C2012 01 26.54521 12 24 11.39 +31 33 34.9 17.9 RoEB062H01
K12B34X C2012 01 26.54548 12 24 15.98 +31 34 26.9 17.9 VrEB062G96
K12B34X C2012 01 26.54688 12 24 15.37 +31 34 04.6 18.4 VrEB062703
K12B34X C2012 01 26.55165 12 24 09.26 +31 31 49.6 17.7 RoEB062H01
K12B34X C2012 01 26.56767 12 24 08.20 +31 28 21.0 18.6 VrEB062703
Observer details:
703 Catalina Sky Survey. Observer A. R. Gibbs. Measurers J. D. Ahern,
E. C. Beshore, A. Boattini, G. J. Garradd, A. R. Gibbs, P. Tricarico,
A. D. Grauer, R. E. Hill, R. A. Kowalski, S. M. Larson, R. H. McNaught.
0.68-m Schmidt + CCD.
G96 Mt. Lemmon Survey. Observer R. E. Hill. Measurers J. D. Ahern,
E. C. Beshore, A. Boattini, A. R. Gibbs, A. D. Grauer, R. E. Hill,
R. A. Kowalski, S. M. Larson, R. H. McNaught. 1.5-m reflector + CCD.
H01 Magdalena Ridge Observatory, Socorro. Observers W. H. Ryan, E. V. Ryan.
Measurer W. H. Ryan. 2.4-m f/8.9 reflector + CCD.
Orbital elements:
2012 BX34 Earth MOID = 0.0004 AU
Epoch 2012 Mar. 14.0 TT = JDT 2456000.5 MPC
M 295.37101 (2000.0) P Q
n 1.48178508 Peri. 335.64548 +0.22116788 +0.96419936
a 0.7619841 Node 306.80578 -0.86211305 +0.12317110
e 0.3564382 Incl. 10.52850 -0.45590115 +0.23483714
P 0.67 H 27.5 G 0.15 U 7
Residuals in seconds of arc
120125 703 1.2+ 0.0 120126 G96 0.1- 0.1+ 120126 G96 0.0 0.2+
120125 703 0.1+ 0.3- 120126 H01 0.1+ 0.0 120126 703 0.7- 0.4-
120125 703 1.3- 1.0- 120126 H01 0.0 0.2+ 120126 H01 0.1- 0.1+
120125 703 0.0 1.4+ 120126 703 0.2- 0.1+ 120126 G96 0.0 0.2+
120126 G96 0.0 0.3+ 120126 703 0.7- 0.1+ 120126 703 0.1- 0.1-
120126 G96 0.1+ 0.2+ 120126 G96 0.3- 0.1+ 120126 H01 0.3+ 0.0
120126 G96 0.2- 0.4+ 120126 G96 0.1+ 0.2+ 120126 703 0.8+ 0.5+
Ephemeris:
2012 BX34 a,e,i = 0.76, 0.36, 11 q = 0.4904
Date TT R. A. (2000) Decl. Delta r Elong. Phase V
2011 12 27 12 02 52.4 +36 15 54 0.1691 1.0453 106.9 64.2 26.0
...
2012 01 11 12 15 06.7 +35 43 47 0.09004 1.0270 116.7 58.8 24.4
...
2012 01 19 12 19 26.7 +35 22 31 0.04688 1.0095 122.0 55.7 22.9
...
2012 01 25 12 22 17.8 +34 07 06 0.01439 0.9929 125.9 53.4 20.2
2012 01 26 12 23 30.2 +33 01 34 0.0089760.9899 126.4 53.1 19.2
2012 01 27 12 27 45.0 +28 35 40 0.0035610.9868 126.2 53.6 17.2
...
2012 02 02 00 26 18.2 -29 32 34 0.02906 0.9664 48.7 130.0 25.5
...
2012 02 10 00 23 27.6 -28 58 25 0.07250 0.9341 42.1 134.9 27.9
...
2012 02 25 00 10 36.1 -27 58 58 0.1579 0.8568 30.1 144.6 30.7
Gareth V. Williams (C) Copyright 2012 MPC M.P.E.C. 2012-B62
2012BX34: D = 0.01 km, P = 0.5000 hr, OC albedo = 0.100
Goldstone: G = 0.94 K/Jy, Tsys = 17.0 K, P = 450 kW, elev >= 20.00 deg, unhopped
t_down = 0 s, t_switch = 0 s
LST # max
start date window window RA, dec dist delta runs SNR SNR/RTT
-----------------------------------------------------------------------------------------
2012 Jan 26 06:05-17:35 06:37-18:09 186, +32 0.006 0 3342 930 18
2012 Jan 27 06:38-14:18 07:14-14:56 191, +9 0.001 0 17092 1,200,000 10000
2012 Jan 28 22:32-00:58 23:15-01:41 6, -32 0.007 0 600 160 7
2012 Jan 29 22:05-01:17 22:52-02:04 7, -31 0.013 0 455 21 1
These SNRs are for monostatic observations, so for bistatic observations reduce them
by about a factor of eight to include DSS-13's smaller dish and warmer system temperature.
Goldstone SNRs assume Ptx = 450 kW
Goldstone tracks:
UT UT PST Duration Round-trip
DOY Date TX Window TX Window hh:mm time (sec) SNR/RTT
027 Jan 27 0640-0955 2240-0155 Jan 26-27 03:15 2 ~1000
TXON is given at the earliest time we can transmit.
From Jon Giorgini, 2012 Jan 26, Solution 8, With 68 optical measuremens (2012-Jan-25 10:22 to 2012-Jan-27 00:58), 2012 BX34 orbit solution #8 was computed. Date__(UT)__HR:MN POS_3sigma DOP_X_3sig RT_delay_3sig 2012-Jan-27 06:00 6.127 475.24 0.001622 2012-Jan-27 07:00 9.123 469.99 0.001455 2012-Jan-27 08:00 13.608 462.46 0.001298 2012-Jan-27 09:00 20.564 451.07 0.001154 2012-Jan-27 10:00 31.870 432.63 0.001028 From Jon Giorgini, 2012 Jan. 26, Solution 5, using new measurements from Station A24: Formal 3-sigma X-band uncertainties: Date__(UT)__HR:MN POS_3sigma DOP_S_3sig DOP_X_3sig RT_delay_3sig 2012-Jan-27 00:00 2.290 148.91 541.21 0.002923 2012-Jan-27 02:00 3.315 148.09 538.22 0.002508 2012-Jan-27 04:00 5.795 146.83 533.65 0.002110 2012-Jan-27 06:00 10.830 144.70 525.90 0.001739 2012-Jan-27 08:00 21.404 140.56 510.85 0.001415 2012-Jan-27 10:00 46.767 130.63 474.76 0.001165 2012-Jan-27 12:00 122.370 101.10 367.45 0.001002 2012-Jan-27 14:00 390.420 195.20 709.45 0.000731 2012-Jan-27 16:00 553.633 396.46 1440.91 0.000715 2012-Jan-27 18:00 241.729 187.82 682.61 0.001494 2012-Jan-27 20:00 123.371 153.88 559.29 0.001983 2012-Jan-27 22:00 85.342 149.52 543.43 0.002418 2012-Jan-28 00:00 72.870 148.72 540.51 0.002848 - - - - - - - - - - - - - - - - - - - - - - - - - - - - From Jon Giorgini, 2012 Jan 26, Solution 3, 25 optical measurements, 2012-Jan-25 to 2012-Jan-26: Date__(UT)__HR:MN POS_3sigma DOP_X_3sig RT_delay_3sig 2012-Jan-27 00:00 14.247 954.17 0.003942 2012-Jan-27 02:00 23.483 947.90 0.003755 2012-Jan-27 04:00 39.070 937.30 0.003728 2012-Jan-27 06:00 67.083 916.96 0.003857 2012-Jan-27 08:00 122.898 870.60 0.004109 2012-Jan-27 10:00 252.814 740.85 0.004406 2012-Jan-27 12:00 631.158 489.03 0.004515 2012-Jan-27 14:00 1939.182 3776.62 0.003255 2012-Jan-27 16:00 2682.927 6647.70 0.002280 2012-Jan-27 18:00 1137.092 2287.43 0.005658 2012-Jan-27 20:00 528.857 1305.64 0.007030 2012-Jan-27 22:00 297.637 1088.18 0.007967 2012-Jan-28 00:00 191.146 1020.05 0.008792 ****************************************************************************************** Apparent Magnitudes and Solar Elongations: Date__(UT)__HR:MN R.A._(J2000.0)_DEC. delta APmag S-O-T /r 2012-Jan-26 00:00 185.87594 33.02502 0.00897329942048 19.21 126.4417 /L 2012-Jan-26 01:00 185.89539 32.94999 0.00874748688853 19.16 126.4570 /L 2012-Jan-26 02:00 185.91578 32.87098 0.00852167301916 19.10 126.4714 /L 2012-Jan-26 03:00 185.93717 32.78765 0.00829585806895 19.04 126.4849 /L 2012-Jan-26 04:00 185.95965 32.69964 0.00807004235464 18.98 126.4975 /L 2012-Jan-26 05:00 185.98332 32.60656 0.00784422626682 18.92 126.5090 /L 2012-Jan-26 06:00 186.00827 32.50794 0.00761841028007 18.86 126.5194 /L 2012-Jan-26 07:00 186.03462 32.40329 0.00739259497301 18.79 126.5284 /L 2012-Jan-26 08:00 186.06250 32.29202 0.00716678104693 18.72 126.5360 /L 2012-Jan-26 09:00 186.09205 32.17350 0.00694096935349 18.65 126.5421 /L 2012-Jan-26 10:00 186.12344 32.04699 0.00671516092129 18.58 126.5464 /L 2012-Jan-26 11:00 186.15686 31.91166 0.00648935699673 18.51 126.5488 /L 2012-Jan-26 12:00 186.19251 31.76655 0.00626355909225 18.43 126.5489 /L 2012-Jan-26 13:00 186.23064 31.61056 0.00603776904123 18.35 126.5466 /L 2012-Jan-26 14:00 186.27152 31.44244 0.00581198907486 18.27 126.5414 /L 2012-Jan-26 15:00 186.31548 31.26069 0.00558622191731 18.18 126.5331 /L 2012-Jan-26 16:00 186.36288 31.06361 0.00536047090107 18.09 126.5211 /L 2012-Jan-26 17:00 186.41417 30.84916 0.00513474012421 18.00 126.5049 /L 2012-Jan-26 18:00 186.46984 30.61496 0.00490903465206 17.90 126.4839 /L 2012-Jan-26 19:00 186.53051 30.35815 0.00468336077517 17.80 126.4572 /L 2012-Jan-26 20:00 186.59688 30.07529 0.00445772636106 17.69 126.4238 /L 2012-Jan-26 21:00 186.66982 29.76221 0.00423214132355 17.58 126.3826 /L 2012-Jan-26 22:00 186.75038 29.41383 0.00400661825300 17.47 126.3319 /L 2012-Jan-26 23:00 186.83982 29.02382 0.00378117329866 17.34 126.2699 /L 2012-Jan-27 00:00 186.93973 28.58429 0.00355582739541 17.21 126.1940 /L 2012-Jan-27 01:00 187.05208 28.08518 0.00333060801805 17.07 126.1008 /L 2012-Jan-27 02:00 187.17938 27.51358 0.00310555173214 16.92 125.9861 /L 2012-Jan-27 03:00 187.32486 26.85255 0.00288070799295 16.76 125.8438 /L 2012-Jan-27 04:00 187.49274 26.07946 0.00265614494058 16.59 125.6656 /L 2012-Jan-27 05:00 187.68869 25.16345 0.00243195850433 16.41 125.4397 /L 2012-Jan-27 06:00 187.92045 24.06129 0.00220828719330 16.21 125.1486 /L 2012-Jan-27 07:00 188.19894 22.71067 0.00198533705839 15.99 124.7661 /L 2012-Jan-27 08:00 188.54000 21.01857 0.00176342577421 15.74 124.2502 /L 2012-Jan-27 09:00 188.96762 18.84033 0.00154306473997 15.47 123.5314 /L 2012-Jan-27 10:00 189.51997 15.93967 0.00132512194003 15.17 122.4875 /L 2012-Jan-27 11:00 190.26176 11.90792 0.00111117004760 14.84 120.8888 /L 2012-Jan-27 12:00 191.31252 5.99163 0.00090429697840 14.47 118.2709 /L 2012-Jan-27 13:00 192.92119 -3.27794 0.00071116299455 14.09 113.6331 /L 2012-Jan-27 14:00 195.71037 -18.69551 0.00054738560215 13.80 104.8696 /L 2012-Jan-27 15:00 201.80746 -43.50884 0.00044794361372 13.95 89.2914 /L 2012-Jan-27 16:00 224.90379 -72.17305 0.00045819330670 14.92 70.6844 /L 2012-Jan-27 17:00 324.08895 -76.94659 0.00057215990361 n.a. 58.8927 /T 2012-Jan-27 18:00 350.43663 -65.13276 0.00074277377386 n.a. 53.9145 /T 2012-Jan-27 19:00 356.88451 -57.03217 0.00093902064861 n.a. 52.0150 /T 2012-Jan-27 20:00 359.71088 -51.67781 0.00114744524703 n.a. 51.2967 /T 2012-Jan-27 21:00 1.29368 -47.95726 0.00136224810984 n.a. 51.0420 /T 2012-Jan-27 22:00 2.30551 -45.24515 0.00158069531563 n.a. 50.9781 /T 2012-Jan-27 23:00 3.00828 -43.18890 0.00180137340020 n.a. 50.9945 /T 2012-Jan-28 00:00 3.52495 -41.57982 0.00202349242346 n.a. 51.0435 /T
CW setup:
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TX polarization RCP
RCV polarization LCP & RCP
Frequency hops: no hops (+1000 Hz offset)
Bandwidth: 8000 Hz
Sampling interval: 1250 x 0.1 usec
VME FFT for PSD files: 8192 for 0.98-Hz resolution
PLEASE PAY ATTENTION TO THE BANDWIDTH AND FFT!
The rest is 40 MHz chirp.
_____________________________________________________________________
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
____________________________________________________________________
OSOD and predicts are on aardvark:
/export/data3/osod/ops/2012bx34/PRDX.OUT.14v-13-13.s8
/PUNCH.OUT.14v-13-13.s8
/EPH.OUT.s8
POINTING
TX Offsets
Date (UTC) DOY hhmmss RA Dec Macro LHA Dec RTT OSOD
2012 01 27 027 070000 189.4124 22.0695 A 1.96
2012 01 27 027 080000 189.7570 20.3797 A -0.10 -1.00 1.73 s8
2012 01 27 027 090000 190.1118 18.1634 A 1.51
2012 01 27 027 090000 190.1118 18.1634 B 1.51
2012 01 27 027 100000 190.4979 15.1498 B -0.10 -1.30 1.28 s8
2012 01 27 027 110000 190.9575 10.8706 B 1.07
Transmit offsets are given in millidegrees.
PRDX.OUT.14f-13-13.s8
TRANSMITTER: STATION #14, RECEIVER: STATION #13
RECEIVER U.T. RANGE DOPPLER LHA DEC RA EL
2012 JAN 27 06:50 1.9996400956 546448.771 282.3188 22.3163 189.357 22.354
2012 JAN 27 07:00 1.9613577914 545862.701 284.7685 22.0732 189.414 24.192
2012 JAN 27 07:10 1.9231187356 545214.484 287.2181 21.8203 189.471 26.036
2012 JAN 27 07:20 1.8849273515 544502.044 289.6678 21.5569 189.529 27.884
2012 JAN 27 07:30 1.8467882259 543723.117 292.1174 21.2823 189.586 29.734
2012 JAN 27 07:40 1.8087060972 542875.221 294.5669 20.9958 189.643 31.585
2012 JAN 27 07:50 1.7706858966 541955.622 297.0163 20.6966 189.701 33.435
2012 JAN 27 08:00 1.7327327537 540961.294 299.4654 20.3840 189.758 35.280
2012 JAN 27 08:10 1.6948520266 539888.872 301.9144 20.0570 189.816 37.119
2012 JAN 27 08:20 1.6570493106 538734.601 304.3630 19.7146 189.875 38.948
2012 JAN 27 08:30 1.6193304919 537494.276 306.8112 19.3557 189.933 40.764
2012 JAN 27 08:40 1.5817017640 536163.171 309.2589 18.9792 189.992 42.563
2012 JAN 27 08:50 1.5441696718 534735.962 311.7060 18.5839 190.052 44.341
2012 JAN 27 09:00 1.5067411636 533206.630 314.1525 18.1684 190.112 46.092
2012 JAN 27 09:10 1.4694236255 531568.359 316.5981 17.7311 190.174 47.810
2012 JAN 27 09:20 1.4322249581 529813.408 319.0428 17.2704 190.236 49.488
2012 JAN 27 09:30 1.3951536453 527932.965 321.4863 16.7846 190.299 51.118
2012 JAN 27 09:40 1.3582188306 525916.978 323.9286 16.2717 190.364 52.689
2012 JAN 27 09:50 1.3214304021 523753.959 326.3694 15.7294 190.430 54.190
2012 JAN 27 10:00 1.2847991170 521430.750 328.8085 15.1555 190.497 55.608
2012 JAN 27 10:10 1.2483367228 518932.246 331.2456 14.5472 190.567 56.926
2012 JAN 27 10:20 1.2120561015 516241.078 333.6805 13.9016 190.639 58.127
2012 JAN 27 10:30 1.1759714452 513337.228 336.1129 13.2157 190.714 59.191
2012 JAN 27 10:40 1.1400984469 510197.589 338.5424 12.4856 190.791 60.095
2012 JAN 27 10:50 1.1044545479 506795.422 340.9687 11.7076 190.871 60.818
2012 JAN 27 11:00 1.0690592124 503099.737 343.3913 10.8771 190.956 61.335
2012 BX34 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) 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/2012BX34/2012BX34_planning.html
Asteroid Radar Astronomy