2012 EG5 Goldstone Radar Observations Planning
2012 EG5 was discovered by Pan-STARRS 1, Haleakala on March 13, 2012. This asteroid is making a very close approach to Earth on April 01, 2012 when the asteroid passes at only 0.0015 AU (~0.6 lunar distances). No physical characteristics are known about this object except that its absolute magnitude of 24.3 suggest a diameter of ~45 m (within a factor of two).We have one Goldstone track scheduled on April 4, when the object is on its outbound trajectory and ~6 lunar distances away. We will have to observe bistatically with DSS-13, because the quasi-optical switch at DSS-14 has been removed for repairs. This will most likely be CW-only target, but we may be able to obtain some ranging data. 2012 EG5 is getting brighter every day and on April 01, it will drop below 13 mag. It moves too close to the Sun few days after the closest approach. Our pointing uncertainties are very large at the moment, but we expect these to drop by the time of our observations. Optical astrometry is very much appreciated. Note added on April 2: Photometry obtained in the last few days indicates that this asteroid has a rotation period of 0.29 hours and that it is an optically-dark, C-class object. Consequently, the diameter may be close to 0.1 km and the echoes should be stronger than we originally estimated. Even so, we expect that this will be a relatively weak target. The lightcurve amplitude suggests at least a modest degree of elongation.
Orbital and Physical Characteristics orbit type Apollo semimajor axis 2.221 AU eccentricity 0.556 inclination 2.6 deg perihelion distance 0.987 AU aphelion distance 3.455 AU absolute magnitude (H) 24.0 (M. D. Hicks, pers. comm.; this is 0.3 mag brighter than the value in Horizons) diameter ~0.1 km (an educated guess based on the spectral class and absolute magnitude) rotation period 0.29 h (J. Pollock, P. Pravec, M. D. Hicks, and P. Bacci, pers. comm.) pole direction unknown lightcurve amplitude 0.35 mag (J. Pollock, P. Pravec, M. D. Hicks, and P. Bacci, pers. comm.) spectral class C (M. D. Hicks, pers. comm.) Last update: 2012 Apr 05
M.P.E.C. 2012-E52 Issued 2012 Mar. 14, 18:14 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 EG5
Observations:
K12E05G* C2012 03 13.30201 08 53 54.413+04 58 00.03 21.0 gLEE052F51
K12E05G C2012 03 13.31512 08 53 53.541+04 57 58.64 20.9 gLEE052F51
K12E05G C2012 03 13.32829 08 53 52.668+04 57 56.88 20.5 rLEE052F51
K12E05G FC2012 03 13.98998 08 53 30.62 +04 55 52.8 uEE052204
K12E05G FC2012 03 14.00192 08 53 30.06 +04 55 50.4 20.0 RuEE052204
K12E05G C2012 03 14.11627 08 53 32.81 +04 55 53.4 20.0 RoEE052H01
K12E05G C2012 03 14.12306 08 53 32.42 +04 55 52.5 19.9 RoEE052H01
K12E05G C2012 03 14.12999 08 53 32.00 +04 55 51.8 20.1 RoEE052H01
K12E05G C2012 03 14.13706 08 53 31.58 +04 55 50.9 20.1 RoEE052H01
K12E05G IC2012 03 14.14684208 53 29.15 +04 55 42.2 tEE052H21
K12E05G IC2012 03 14.15561908 53 28.62 +04 55 40.6 tEE052H21
K12E05G IC2012 03 14.16440208 53 28.16 +04 55 38.9 tEE052H21
K12E05G HC2012 03 14.25004 08 53 25.02 +04 55 38.3 oEE052291
K12E05G HC2012 03 14.25353 08 53 24.80 +04 55 37.9 oEE052291
K12E05G HC2012 03 14.25701 08 53 24.59 +04 55 37.2 oEE052291
K12E05G %C2012 03 14.31566108 53 25.33 +04 55 47.9 20.1 RoEE052F65
K12E05G %C2012 03 14.31764208 53 25.20 +04 55 47.6 20.1 RoEE052F65
K12E05G %C2012 03 14.31970008 53 25.06 +04 55 47.3 20.1 RoEE052F65
Observer details:
204 Schiaparelli Observatory. Observer L. Buzzi. 0.60-m f/4.64 reflector
+ CCD.
291 LPL/Spacewatch II. Observer T. H. Bressi. 1.8-m f/2.7 reflector + CCD.
F51 Pan-STARRS 1, Haleakala. Observers N. Primak, A. Schultz, S. Watters,
J. Thiel, T. Goggia. Measurer PS1 Science Consortium. 1.8-m
Ritchey-Chretien + CCD.
F65 Haleakala-Faulkes Telescope North. Observer T. Lister. 2.0-m f/10
Ritchey-Chretien + 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.
H21 Astronomical Research Observatory, Westfield. Observer R. Holmes.
Measurers T. Vorobjov, L. Buzzi, S. Foglia. 0.61-m f/4.0 astrograph + CCD.
Orbital elements:
2012 EG5 Earth MOID = 0.0005 AU
Epoch 2012 Mar. 14.0 TT = JDT 2456000.5 MPC
M 350.11680 (2000.0) P Q
n 0.31668849 Peri. 13.57552 -0.88676171 +0.46210344
a 2.1316433 Node 193.96226 -0.42811092 -0.82980533
e 0.5359950 Incl. 2.53719 -0.17428341 -0.31286342
P 3.11 H 24.1 G 0.15 U 7
Residuals in seconds of arc
120313 F51 0.0 0.1- 120314 H01 0.1+ 0.0 120314 291 0.1+ 0.1-
120313 F51 0.1- 0.1+ 120314 H01 0.1- 0.1+ 120314 291 0.0 0.0
120313 F51 0.0 0.1- 120314 H01 0.0 0.1+ 120314 291 0.0 0.1-
120313 204 0.2- 0.0 120314 H21 0.5- 0.4+ 120314 F65 0.1- 0.0
120314 204 0.0 0.5- 120314 H21 0.6- 0.1+ 120314 F65 0.0 0.0
120314 H01 0.0 0.1+ 120314 H21 0.4+ 0.4- 120314 F65 0.1- 0.0
Ephemeris:
2012 EG5 a,e,i = 2.13, 0.54, 3 q = 0.9891
Date TT R. A. (2000) Decl. Delta r Elong. Phase V
2012 02 13 09 15 34.6 +05 44 26 0.2537 1.2375 169.5 8.3 22.2
...
2012 02 28 09 03 39.7 +05 16 56 0.1641 1.1420 155.6 21.0 21.5
...
2012 03 07 08 57 36.0 +05 08 06 0.1231 1.0974 146.8 29.7 21.0
...
2012 03 13 08 54 02.4 +04 59 02 0.09398 1.0679 140.3 36.5 20.6
2012 03 14 08 53 33.6 +04 56 58 0.08922 1.0634 139.3 37.6 20.5
2012 03 15 08 53 07.1 +04 54 37 0.08448 1.0590 138.2 38.8 20.4
...
2012 03 21 08 51 34.2 +04 30 54 0.05637 1.0349 132.1 45.5 19.7
...
2012 03 29 08 57 56.1 +01 54 38 0.01930 1.0100 126.4 52.7 17.5
...
2012 04 13 20 47 47.7 -05 20 29 0.05040 0.9873 70.9 106.4 21.5
A. U. Tomatic (C) Copyright 2012 MPC M.P.E.C. 2012-E52
Target name: 2012 EG5
D = 0.1 km
P = 0.29 h
OC albedo = 0.100
# max
start date window RA, dec dist runs SNR SNR/run
-------------------------------------------------------------------------
2012 Mar 27 23:53-08:47 134, +2 0.020 717 139 6
2012 Mar 28 23:55-08:42 135, +1 0.016 900 383 14
2012 Mar 30 00:02-08:37 136, -1 0.011 1206 1464 46
2012 Mar 31 00:27-08:27 140, -7 0.006 1778 9731 253
2012 Apr 02 12:04-18:50 305, -16 0.006 1473 7774 222
2012 Apr 03 11:50-19:18 308, -10 0.011 1037 1237 42
2012 Apr 04 11:43-19:27 310, -8 0.016 784 332 13
2012 Apr 05 11:38-19:30 311, -7 0.021 629 123 5
2012 Apr 06 11:34-19:30 311, -7 0.025 524 55 3
Goldstone SNRs assume Ptx = 450 kW
These SNRs assume monostatic observations at DSS-14. Bistatic observations
will be several times weaker.
Goldstone tracks:
UT UT PST Duration Round-trip
DOY Date TX Window TX Window hh:mm time (sec) SNR/Run
--- ---- --------- --------- --------- --------- -------
095 Apr 04 1340-1640 0640-0940 Apr 04 03:00 15.4 2
TXON is given at the earliest possible transmit time.
There are no tracks scheduled to observe this asteroid at Arecibo.
From Jon Giorgini, 2012 Apr 3 (435 optical measurements (covering 2012-Mar-13 to 2012-Apr-02), solution #20. Formal s20 3-sigma X-band uncertainties over the span of the actual track: Date__(UT)__HR:MN POS_3sigma DOP_X_3sig RT_delay_3sig 2012-Apr-04 13:00 1.326 30.94 0.001019 2012-Apr-04 14:00 1.325 30.93 0.001032 2012-Apr-04 15:00 1.324 30.92 0.001045 2012-Apr-04 16:00 1.325 30.90 0.001058 2012-Apr-04 17:00 1.327 30.89 0.001071 - - - - - - - - - - - - - - - - - - - - From Horizons, 2012 Apr 2 (Solution 17, #obs = 423, 18 days) Date__(UT)__HR:MN R.A._(J2000.0)_DEC. delta POS_3sigma DOP_S_3sig DOP_X_3sig RT_delay_3sig 2012-Mar-28 00:00 *m 133.93795 2.35829 0.02129683742853 0.240 45.81 166.48 0.007299 2012-Mar-29 00:00 *m 134.62582 1.32429 0.01649241947327 0.263 45.67 165.99 0.005638 2012-Mar-30 00:00 *m 135.91673 -0.56457 0.01169850725359 0.338 45.38 164.92 0.003985 2012-Mar-31 00:00 *m 139.04518 -5.06206 0.00694158637037 0.529 44.39 161.33 0.002351 2012-Apr-01 00:00 *m 155.84124 -26.50893 0.00247892365547 1.955 34.05 123.77 0.000842 2012-Apr-02 00:00 *m 295.05600 -26.58417 0.00334673443254 9.684 39.57 143.81 0.001147 2012-Apr-03 00:00 *m 306.10802 -13.14431 0.00795308083812 9.775 44.60 162.11 0.002716 2012-Apr-04 00:00 *m 308.74360 -9.56377 0.01272568249597 9.882 45.30 164.65 0.004356 2012-Apr-05 00:00 * 309.93538 -7.93031 0.01752631344528 9.951 45.52 165.42 0.006009 2012-Apr-06 00:00 * 310.62772 -6.99494 0.02233507154227 10.000 45.59 165.69 0.007667 2012-Apr-07 00:00 * 311.09171 -6.38699 0.02714561995007 10.039 45.60 165.72 0.009327 2012-Apr-08 00:00 * 311.43403 -5.95816 0.03195469144373 10.073 45.57 165.62 0.010986 2012-Apr-09 00:00 * 311.70491 -5.63763 0.03675993053029 10.104 45.52 165.43 0.012644 2012-Apr-10 00:00 * 311.93092 -5.38737 0.04155929945286 10.133 45.44 165.14 0.014300 - - - - - - - - - - - - - - - - - - - - From Jon Giorgini, Mar 30, 2012: 326 optical measurements (2012-Mar-14 to 2012-Mar-30), s#15 Date__(UT)__HR:MN POS_3sigma DOP_X_3sig RT_delay_3sig 2012-Apr-04 13:00 38.974 647.91 0.020647 2012-Apr-04 14:00 38.904 648.20 0.020916 2012-Apr-04 15:00 38.825 648.33 0.021185 2012-Apr-04 16:00 38.745 648.30 0.021455 2012-Apr-04 17:00 38.669 648.11 0.021724 - - - - - - - - - - - - - - - - - - - - JPL Sol. #13, #obs is 214 (14 days) Date__(UT)__HR:MN POS_3sigma DOP_S_3sig DOP_X_3sig RT_delay_3sig 2012-Mar-28 00:00 *m 1.399 288.99 1050.32 0.045553 2012-Mar-29 00:00 *m 2.884 288.14 1047.25 0.035230 2012-Mar-30 00:00 *m 7.854 286.25 1040.34 0.025078 2012-Mar-31 00:00 *m 31.162 279.58 1016.11 0.015406 2012-Apr-01 00:00 *m 334.324 236.98 861.30 0.007240 2012-Apr-02 00:00 *m 244.747 271.77 987.75 0.009927 2012-Apr-03 00:00 *m 78.199 282.63 1027.19 0.019266 2012-Apr-04 00:00 *m 64.830 286.19 1040.15 0.029247 2012-Apr-05 00:00 * 62.812 287.34 1044.32 0.039487 2012-Apr-06 00:00 * 62.461 287.72 1045.72 0.049833 2012-Apr-07 00:00 * 62.480 287.75 1045.82 0.060226 2012-Apr-08 00:00 * 62.603 287.56 1045.13 0.070639 2012-Apr-09 00:00 * 62.760 287.21 1043.83 0.081057 2012-Apr-10 00:00 * 62.932 286.71 1042.03 0.091469 ****************************************************************************************** Apparent Magnitudes and Solar Elongations: Date__(UT)__HR:MN R.A._(J2000.0)_DEC. APmag delta S-O-T /r 2012-Mar-28 00:00 *m 133.93790 2.35828 17.87 0.02130342836506 126.7682 /T 2012-Mar-29 00:00 *m 134.62573 1.32426 17.32 0.01649746636107 126.6115 /T 2012-Mar-30 00:00 *m 135.91661 -0.56464 16.56 0.01170201682543 127.1257 /T 2012-Mar-31 00:00 *m 139.04502 -5.06233 15.36 0.00694357802205 129.5607 /T 2012-Apr-01 00:00 *m 155.84217 -26.51137 12.83 0.00247954047648 140.2246 /T 2012-Apr-02 00:00 *m 295.05639 -26.58491 15.51 0.00334796174677 80.1709 /L 2012-Apr-03 00:00 *m 306.10708 -13.14611 18.02 0.00795579094830 68.3514 /L 2012-Apr-04 00:00 *m 308.74244 -9.56573 19.16 0.01272992017035 66.1097 /L 2012-Apr-05 00:00 * 309.93412 -7.93233 19.87 0.01753208938446 65.6219 /L 2012-Apr-06 00:00 * 310.62641 -6.99698 20.37 0.02234238938670 65.7425 /L 2012-Apr-07 00:00 * 311.09036 -6.38905 20.75 0.02715448067270 66.1412 /L 2012-Apr-08 00:00 * 311.43266 -5.96023 21.05 0.03196509458052 66.6882 /L 2012-Apr-09 00:00 * 311.70353 -5.63970 21.29 0.03677187463229 67.3224 /L 2012-Apr-10 00:00 * 311.92951 -5.38945 21.50 0.04157278227990 68.0116 /L 2012-Apr-11 00:00 * 312.12581 -5.18727 21.68 0.04636591713270 68.7373 /L 2012-Apr-12 00:00 * 312.30161 -5.01938 21.83 0.05114946379369 69.4882 /L 2012-Apr-13 00:00 * 312.46277 -4.87677 21.96 0.05592167539963 70.2573 /L 2012-Apr-14 00:00 * 312.61310 -4.75333 22.08 0.06068086476487 71.0398 /L 2012-Apr-15 00:00 * 312.75520 -4.64476 22.19 0.06542539580606 71.8326 /L 2012-Apr-16 00:00 * 312.89081 -4.54798 22.28 0.07015367512682 72.6332 /L 2012-Apr-17 00:00 * 313.02118 -4.46071 22.37 0.07486414498067 73.4403 /L 2012-Apr-18 00:00 * 313.14716 -4.38124 22.44 0.07955527826295 74.2527 /L 2012-Apr-19 00:00 *m 313.26933 -4.30826 22.51 0.08422557541070 75.0696 /L 2012-Apr-20 00:00 *m 313.38808 -4.24077 22.58 0.08887356266196 75.8903 /L
The rapid rotation period of 0.29 hours and the 0.1 km estimated size of this asteroid
suggest that the bandwidth will be 30-40 Hz. We'll start with the setup below, but
we may change it to a setup with coarser frequency resolution depending on how things go.
CW setup:
---------------------------------------------------------------------------
TX polarization RCP
RCV polarization LCP & RCP
Frequency hops: no hops,+0.5kHz offset
Bandwidth: 2000 Hz
Sampling interval: 2500 x 0.1 usec
VME FFT for PSD files: 1024 for 3.9-Hz resolution
Ranging setups:
---------------------------------------------------------------------------
127 x 64 10-usec
baud 10 usec
code 127
PRP 1270 usec
FFT 64
ncoh 1
bandwidth 787 Hz
resolution 12.3 Hz
TXOFF +150 Hz (echo in bin 32+12=44)
---------------------------------------------------------------------------
127 x 64 11-usec
baud 11 usec
code 127
PRP 1397 usec
FFT 64
ncoh 1
bandwidth 717 Hz
resolution 11.2 Hz
TXOFF +150 Hz (echo in bin 32+13=45)
-------------------------------------------------------------------------
1-usec
baud 1 usec
code 255
ncoh 6
bandwidth 654 Hz
FFT 128
dfreq 5.1 Hz
TXoff +80 Hz (echo in bin 64+16 =80)
-------------------------------------------------------------------------------
_____________________________________________________________________
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 bistatic predicts are on aardvark:
/export/data3/osod/ops/2012eg5/PRDX.OUT.14f-13-13.s20
/PUNCH.OUT.14f-13-13.s20
/EPH.OUT.s20
for WFG:
/export/data3/osod/ops/2012eg5/PRDX.OUT.14v-13-13.s20
/PUNCH.OUT.14v-13-13.s20
/EPH.OUT.s20
POINTING
TX Offsets
Date (UTC) DOY hhmmss RA Dec Macro LHA Dec RTT OSOD
2012 04 04 095 130000 309.8344 -8.5363 A 15.2
2012 04 04 095 140000 309.8493 -8.4744 A 15.4
2012 04 04 095 150000 309.8604 -8.4130 A 0.0 0.20 15.6 s20
2012 04 04 095 160000 309.8699 -8.3517 A 15.8
2012 04 04 095 170000 309.8803 -8.2908 A 16.0
Transmit offsets are given in millidegrees.
PRDX.OUT.14f-13-13.s20
TRANSMITTER: STATION #14, RECEIVER: STATION #13
RECEIVER U.T. RANGE DOPPLER LHA DEC RA EL
2012 APR 04 13:00 15.2487108062 -461541.246 321.6179 -8.5360 309.834 33.191
2012 APR 04 13:10 15.2810880320 -462293.185 324.1220 -8.5256 309.837 34.670
2012 APR 04 13:20 15.3135188213 -463069.174 326.6261 -8.5153 309.840 36.088
2012 APR 04 13:30 15.3460047999 -463867.751 329.1304 -8.5050 309.842 37.439
2012 APR 04 13:40 15.3785475078 -464687.408 331.6349 -8.4947 309.845 38.718
2012 APR 04 13:50 15.4111483594 -465526.596 334.1395 -8.4844 309.847 39.919
2012 APR 04 14:00 15.4438086684 -466383.726 336.6442 -8.4741 309.849 41.035
2012 APR 04 14:10 15.4765296359 -467257.177 339.1490 -8.4638 309.851 42.062
2012 APR 04 14:20 15.5093123483 -468145.295 341.6539 -8.4536 309.853 42.992
2012 APR 04 14:30 15.5421577841 -469046.394 344.1589 -8.4433 309.855 43.821
2012 APR 04 14:40 15.5750667843 -469958.767 346.6639 -8.4331 309.857 44.541
2012 APR 04 14:50 15.6080400787 -470880.681 349.1691 -8.4228 309.859 45.149
2012 APR 04 15:00 15.6410782841 -471810.387 351.6743 -8.4126 309.860 45.638
2012 APR 04 15:10 15.6741818663 -472746.119 354.1795 -8.4024 309.862 46.006
2012 APR 04 15:20 15.7073512042 -473686.099 356.6847 -8.3922 309.863 46.248
2012 APR 04 15:30 15.7405865237 -474628.542 359.1900 -8.3820 309.865 46.364
2012 APR 04 15:40 15.7738879346 -475571.655 1.6953 -8.3718 309.867 46.352
2012 APR 04 15:50 15.8072554211 -476513.646 4.2006 -8.3616 309.868 46.211
2012 APR 04 16:00 15.8406888417 -477452.725 6.7058 -8.3514 309.870 45.944
2012 APR 04 16:10 15.8741879391 -478387.106 9.2111 -8.3412 309.871 45.552
2012 APR 04 16:20 15.9077523122 -479315.013 11.7163 -8.3311 309.873 45.040
2012 APR 04 16:30 15.9413814452 -480234.682 14.2215 -8.3209 309.875 44.410
2012 APR 04 16:40 15.9750746994 -481144.365 16.7266 -8.3107 309.876 43.669
2012 APR 04 16:50 16.0088313139 -482042.334 19.2316 -8.3006 309.878 42.820
2012 APR 04 17:00 16.0426504170 -482926.882 21.7366 -8.2905 309.880 41.871
2012EG5 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.benner@jpl.nasa.gov
California Institute of Technology | Plan: To live long and prosper
Pasadena, CA 91109-8099
http://echo.jpl.nasa.gov/asteroids/2012EG5/2012EG5_planning.html
Asteroid Radar Astronomy