GOLDSTONE RADAR IMAGE OF 2012 QG42 FROM SEPTEMBER 15 3.75 meters x 0.015 Hz
2012 QG42 Goldstone Radar Observations Planning
GOLDSTONE RADAR IMAGE OF 2012 QG42 FROM SEPTEMBER 15 3.75 meters x 0.015 Hz
2012 QG42 was discovered by the Catalina Sky Survey on August 26, 2012. It will approach Earth within 7.4 lunar distances (0.0191 AU) on Sep 14, 2012, when it will be an outstanding radar target at both Goldstone and Arecibo. 2012 QG42 also makes regular approaches within 0.1 AU of both Venus and Mars. Not much is known about this object, except that its absolute magnitude of 20.69 suggests ~0.23 km diameter (within a factor of two). Recently Bill Ryan and Brian Warner have obtained lightcurves and reported that the rotational period is likely slow (>10 h). The amplitude of their partial lightcurves is ~1 mag, suggesting a very elongated shape. We have two short tracks scheduled at Goldstone on Sep 13 and 15. As a result of the very high SNRs and the object's slow rotation, we are planning to utilize the highest resolution available from the chirp system (3.75 m), which could place hundredes of pixels on the object and reveal considerable surface detail. 2012 QG42 will also be observed at Arecibo on four days between Sep 14-17. Michael Busch also plans Arecibo-VLBA radar speckle tracking on Sep 16 and 17. 2012 QG42 brightens below 14th magnitude just prior to its closest approach on Sep 14. It will become a daytime object after Sep 17. Lightcurves, spectroscopy and astrometry are highly desirable prior to the radar observing campaign. 2012 QG42 has been classified as a "Potentially Hazardous Asteroid" by the Minor Planet Center.
Orbital and Physical Characteristics orbit type Apollo semimajor axis 1.026 AU eccentricity 0.375 inclination 7 deg perihelion distance 0.642 AU aphelion distance 1.410 AU absolute magnitude (H) 20.7 diameter ~0.23 km (within a factor of two) rotation period ~24 h? (Bill Ryan and Brian Warner, pers. comm.) pole direction unknown lightcurve amplitude ~1 mag; suggest an elongated shape spectral class unknown Last update: 2012 September 29
M.P.E.C. 2012-Q72 Issued 2012 Aug. 28, 20:02 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 QG42
Observations:
K12Q42G* C2012 08 26.35807 23 59 58.74 -10 53 56.0 16.8 VrEQ072703
K12Q42G C2012 08 26.36551 23 59 57.91 -10 53 52.0 16.8 VrEQ072703
K12Q42G C2012 08 26.37307 23 59 57.08 -10 53 47.6 16.8 VrEQ072703
K12Q42G C2012 08 26.38057 23 59 56.25 -10 53 43.4 16.8 VrEQ072703
K12Q42G C2012 08 26.40023 23 59 54.06 -10 53 32.2 16.9 VrEQ072703
K12Q42G C2012 08 26.40674 23 59 53.30 -10 53 28.7 16.9 VrEQ072703
K12Q42G C2012 08 26.41317 23 59 52.62 -10 53 25.1 16.8 VrEQ072703
K12Q42G C2012 08 26.41966 23 59 51.90 -10 53 20.9 16.7 VrEQ072703
K12Q42G C2012 08 26.44174 23 59 49.52 -10 53 07.5 16.7 VrEQ072703
K12Q42G C2012 08 26.44358 23 59 49.34 -10 53 06.6 16.6 VrEQ072703
K12Q42G C2012 08 26.44540 23 59 49.09 -10 53 05.5 16.8 VrEQ072703
K12Q42G C2012 08 26.44724 23 59 48.91 -10 53 04.4 16.7 VrEQ072703
K12Q42G |C2012 08 26.45905 23 59 47.32 -10 52 56.5 16.9 VcEQ072H06
K12Q42G |C2012 08 26.46112 23 59 47.11 -10 52 55.4 16.8 VcEQ072H06
K12Q42G |C2012 08 26.46319 23 59 46.89 -10 52 54.1 16.8 VcEQ072H06
K12Q42G |C2012 08 26.46526 23 59 46.65 -10 52 52.9 16.7 VcEQ072H06
K12Q42G C2012 08 26.60100 23 59 39.41 -10 51 37.6 17.1 VuEQ072900
K12Q42G C2012 08 26.60813 23 59 38.64 -10 51 33.7 17.1 VuEQ072900
K12Q42G C2012 08 26.61527 23 59 37.86 -10 51 29.8 17.2 VuEQ072900
K12Q42G C2012 08 26.63211 23 59 34.98 -10 50 02.9 16.7 VoEQ072E23
K12Q42G C2012 08 26.63762 23 59 34.36 -10 49 59.7 16.7 VoEQ072E23
K12Q42G C2012 08 26.64190 23 59 33.87 -10 49 57.4 16.7 VoEQ072E23
K12Q42G C2012 08 26.66445 23 59 32.55 -10 51 02.0 17.0 RoEQ072300
K12Q42G C2012 08 26.68300 23 59 30.42 -10 50 51.1 17.1 RoEQ072300
K12Q42G C2012 08 26.70152 23 59 28.27 -10 50 40.0 17.1 RoEQ072300
K12Q42G C2012 08 26.71017 23 59 27.33 -10 50 35.3 17.2 RoEQ072300
K12Q42G KC2012 08 26.93908 23 59 09.11 -10 48 24.2 17.3 VoEQ072C77
K12Q42G KC2012 08 26.95144 23 59 07.73 -10 48 17.2 17.5 VoEQ072C77
K12Q42G C2012 08 26.96178 23 59 06.30 -10 48 09.3 17.5 RvEQ072470
K12Q42G KC2012 08 26.96434 23 59 06.30 -10 48 09.7 17.7 VoEQ072C77
K12Q42G C2012 08 26.96611 23 59 05.75 -10 48 06.4 17.3 RvEQ072470
K12Q42G C2012 08 26.96827 23 59 05.55 -10 48 05.6 17.3 RvEQ072470
K12Q42G C2012 08 26.97043 23 59 05.26 -10 48 04.1 17.3 RvEQ072470
K12Q42G C2012 08 26.97260 23 59 05.03 -10 48 03.0 17.2 RvEQ072470
K12Q42G KC2012 08 26.97778 23 59 04.75 -10 48 01.7 17.5 VoEQ072C77
K12Q42G C2012 08 27.00551 23 59 01.57 -10 47 50.1 16.2 RuEQ072C23
K12Q42G C2012 08 27.01117 23 59 00.98 -10 47 47.6 16.4 RuEQ072C23
K12Q42G C2012 08 27.01427 23 59 01.04 -10 47 38.3 17.3 RtEQ072C27
K12Q42G C2012 08 27.02250 23 58 59.73 -10 47 41.4 17.0 RuEQ072C23
K12Q42G C2012 08 27.02533 23 58 59.39 -10 47 39.0 16.9 RuEQ072C23
K12Q42G C2012 08 27.02926 23 58 59.27 -10 47 29.2 17.1 RtEQ072C27
K12Q42G C2012 08 27.03943 23 58 58.07 -10 47 23.6 16.7 RtEQ072C27
K12Q42G C2012 08 27.04941 23 58 57.23 -10 47 14.7 16.6 RtEQ072I89
K12Q42G C2012 08 27.05605 23 58 56.42 -10 47 10.7 17.0 RtEQ072I89
K12Q42G KC2012 08 27.06195 23 58 58.94 -10 45 37.3 17.1 VvEQ072I39
K12Q42G C2012 08 27.06273 23 58 55.64 -10 47 06.5 17.0 RtEQ072I89
K12Q42G C2012 08 27.06948 23 58 54.82 -10 47 02.4 17.0 RtEQ072I89
K12Q42G KC2012 08 27.06966 23 58 58.12 -10 45 32.4 17.1 VvEQ072I39
K12Q42G KC2012 08 27.08342 23 58 56.63 -10 45 25.4 17.3 VvEQ072I39
K12Q42G C2012 08 27.11384 23 58 49.33 -10 46 43.4 16.5 RuEQ072C23
K12Q42G C2012 08 27.11737 23 58 48.90 -10 46 41.3 16.5 RuEQ072C23
K12Q42G C2012 08 27.33543 23 58 30.21 -10 44 18.5 16.7 rEQ072718
K12Q42G C2012 08 27.34003 23 58 29.66 -10 44 15.3 16.7 rEQ072718
K12Q42G KC2012 08 27.34401 23 58 27.36 -10 44 08.6 16.3 RrEQ072850
K12Q42G C2012 08 27.34423 23 58 29.15 -10 44 13.1 16.7 rEQ072718
K12Q42G C2012 08 27.34844 23 58 28.64 -10 44 10.0 16.7 rEQ072718
K12Q42G KC2012 08 27.35448 23 58 26.08 -10 44 01.6 16.3 RrEQ072850
K12Q42G KC2012 08 27.36646 23 58 24.61 -10 43 53.6 16.3 RrEQ072850
K12Q42G KC2012 08 27.37767 23 58 23.24 -10 43 46.1 16.3 RrEQ072850
K12Q42G KC2012 08 27.38889 23 58 21.88 -10 43 38.7 16.3 RrEQ072850
K12Q42G QC2012 08 27.52511623 58 13.468-10 40 49.83 16.6 VrEQ072E12
K12Q42G QC2012 08 27.52547723 58 13.421-10 40 49.63 16.6 VrEQ072E12
K12Q42G QC2012 08 27.52583623 58 13.383-10 40 49.42 16.4 VrEQ072E12
K12Q42G KC2012 08 27.90642 23 57 33.40 -10 38 06.5 17.7 VuEQ072595
K12Q42G KC2012 08 27.91662 23 57 32.13 -10 38 00.3 17.7 VuEQ072595
K12Q42G C2012 08 27.96428 23 57 25.88 -10 37 31.2 17.8 VuEQ072C47
K12Q42G C2012 08 27.97433 23 57 24.64 -10 37 24.4 17.3 VuEQ072C47
K12Q42G C2012 08 27.98294 23 57 23.54 -10 37 18.7 17.8 VuEQ072C47
K12Q42G C2012 08 27.99011 23 57 22.60 -10 37 14.0 17.7 VuEQ072C47
K12Q42G C2012 08 27.99944 23 57 21.40 -10 37 07.5 17.5 VuEQ072C47
K12Q42G KC2012 08 28.04318 23 57 15.98 -10 36 34.1 17.4 RuEQ072160
K12Q42G KC2012 08 28.04663 23 57 15.51 -10 36 31.7 17.3 RuEQ072160
K12Q42G KC2012 08 28.05004 23 57 15.06 -10 36 29.2 17.1 RuEQ072160
K12Q42G C2012 08 28.13660 23 57 05.14 -10 35 14.1 tEQ072954
K12Q42G C2012 08 28.15714 23 57 02.35 -10 35 00.3 16.3 VtEQ072954
K12Q42G C2012 08 28.17793 23 56 59.47 -10 34 45.2 16.1 VtEQ072954
K12Q42G KC2012 08 28.28350 23 56 50.24 -10 33 42.5 16.9 VuEQ072H21
K12Q42G KC2012 08 28.28559 23 56 49.96 -10 33 41.0 16.9 VuEQ072H21
K12Q42G KC2012 08 28.28768 23 56 49.67 -10 33 39.7 16.9 VuEQ072H21
K12Q42G KC2012 08 28.28978 23 56 49.37 -10 33 38.2 16.9 VuEQ072H21
K12Q42G KC2012 08 28.29187 23 56 49.09 -10 33 36.6 16.9 VuEQ072H21
K12Q42G KC2012 08 28.31449 23 56 45.77 -10 33 16.5 16.7 RrEQ072850
K12Q42G KC2012 08 28.32947 23 56 43.69 -10 33 05.8 16.3 RrEQ072850
K12Q42G KC2012 08 28.34445 23 56 41.60 -10 32 54.8 16.4 RrEQ072850
K12Q42G C2012 08 28.34729 23 56 41.94 -10 32 56.5 16.4 RuEQ072H36
K12Q42G C2012 08 28.34809 23 56 41.83 -10 32 55.9 16.4 RuEQ072H36
K12Q42G C2012 08 28.34888 23 56 41.72 -10 32 55.3 16.4 RuEQ072H36
K12Q42G C2012 08 28.34968 23 56 41.61 -10 32 54.7 16.4 RuEQ072H36
K12Q42G AC2012 08 28.37328 23 56 38.91 -10 32 32.6 16.4 tEQ072H06
K12Q42G AC2012 08 28.37426 23 56 38.81 -10 32 31.5 16.5 tEQ072H06
K12Q42G AC2012 08 28.47106 23 56 25.19 -10 31 18.8 16.4 tEQ072H06
K12Q42G AC2012 08 28.47219 23 56 25.02 -10 31 17.1 16.8 tEQ072H06
K12Q42G AC2012 08 28.47329 23 56 24.89 -10 31 16.6 16.5 tEQ072H06
Observer details:
160 Castelmartini. Observers E. Prosperi, S. Prosperi. Measurer E. Prosperi.
0.35-m f/10 Schmidt-Cassegrain + CCD.
300 Bisei Spaceguard Center--BATTeRS. Observers S. Urakawa, N. Hashimoto,
K. Nishiyama. 1.0-m f/3.0 reflector + CCD.
470 Ceccano. Observers G. Masi, F. Nocentini. Measurers G. Masi, U. Masi,
F. Nocentini. 0.43-m f/6.8 reflector + CCD.
595 Farra d'Isonzo. Observers E. Pettarin, M. Vivona. Measurer E. Pettarin.
0.40-m f/4.5 reflector + CCD.
703 Catalina Sky Survey. Observer J. A. Johnson. Measurers A. Boattini,
E. J. Christensen, A. R. Gibbs, A. D. Grauer, R. E. Hill, R. A. Kowalski,
S. M. Larson, R. H. McNaught. 0.68-m Schmidt + CCD.
718 Wiggins Observatory, Tooele. Observer P. Wiggins. 0.35-m f/5.5
Schmidt-Cassegrain + CCD.
850 Cordell-Lorenz Observatory, Sewanee. Observer D. T. Durig. 0.30-m f/2.5
Schmidt-Cassegrain + 765x510 CCD.
900 Moriyama. Observer Y. Ikari. 0.26-m f/7.0 reflector + CCD.
954 Teide Observatory. Observer N. E. Pritchett. 0.35-m f/11
Schmidt-Cassegrain + CCD.
C23 Olmen. Observer A. Diepvens. 0.20-m f/9 refractor + CCD.
C27 Pallerols. Observer A. Jorba. 0.25-m f/4.8 reflector + CCD.
C47 Nonndorf. Observer G. Dangl. 0.25-m f/4.8 reflector + CCD.
C77 Bernezzo Observatory. Observer A. Mantero. 0.25-m f/4 reflector + CCD.
E12 Siding Spring Survey. Observer R. H. McNaught. 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. 0.5-m Uppsala Schmidt + CCD.
E23 Arcadia. Observer A. Hidas. 0.35-m Schmidt-Cassegrain + CCD.
H06 RAS Observatory, Mayhill. Observers H. Sato, M. Urbanik. 0.25-m f/3.4
astrograph + CCD, 0.25-m f/3.4 reflector + CCD.
H21 Astronomical Research Observatory, Westfield. Observer R. Holmes.
Measurers L. Buzzi, S. Foglia, T. Vorobjov. 0.61-m f/4.0 astrograph + CCD.
H36 Sandlot Observatory, Scranton. Observer G. Hug. 0.56-m reflector + CCD.
I39 Observatorio Cruz del Sur, San Justo. Observer A. Chapman. 0.20-m f/4
reflector + CCD.
I89 RAS Observatory, Nerpio. Observer E. Bryssinck. 0.43-m f/6.8 reflector
+ CCD.
Orbital elements:
2012 QG42 PHA, Earth MOID = 0.0137 AU
Epoch 2012 Sept. 30.0 TT = JDT 2456200.5 MPC
M 308.63651 (2000.0) P Q
n 0.94803187 Peri. 116.11577 -0.19301091 -0.98070755
a 1.0262522 Node 344.91579 +0.85236094 -0.15194632
e 0.3761938 Incl. 6.83603 +0.48603252 -0.12298384
P 1.04 H 20.3 G 0.15 U 8
.
.
.
Ephemeris:
2012 QG42 a,e,i = 1.03, 0.38, 7 q = 0.6402
Date TT R. A. (2000) Decl. Delta r Elong. Phase V
2012 07 29 23 58 59.8 -13 03 11 0.3411 1.2639 130.5 37.6 20.0
...
2012 08 13 00 06 33.1 -12 08 33 0.2221 1.1965 142.3 31.2 18.8
...
2012 08 21 00 05 03.6 -11 32 18 0.1632 1.1556 149.7 26.2 17.9
...
2012 08 27 23 59 01.3 -10 46 51 0.1213 1.1226 156.5 21.0 17.0
2012 08 28 23 57 21.0 -10 36 02 0.1145 1.1170 157.8 20.0 16.8
2012 08 29 23 55 24.7 -10 23 49 0.1078 1.1112 159.1 18.9 16.7
...
2012 09 04 23 34 34.5 -08 17 22 0.06852 1.0759 169.5 9.8 15.3
...
2012 09 12 21 15 03.5 +06 28 57 0.02348 1.0262 146.8 32.5 13.6
...
2012 09 27 13 25 34.6 +17 30 09 0.08497 0.9265 25.8 151.9 23.6
A. U. Tomatic (C) Copyright 2012 MPC M.P.E.C. 2012-Q72
Target Name: 2012 QG42
D = 0.23 km
Period = 10 h (assumption based on the lightcurves; P could be even slower)
OC albedo = 0.1
UT # max
start date window RA, dec dist runs SNR SNR/run
-----------------------------------------------------------------------
2012 Sep 10 02:34-11:04 335, 0 0.032 511 460 23
2012 Sep 11 01:53-10:38 327, +3 0.027 615 890 40
2012 Sep 12 00:59-10:03 317, +7 0.023 742 1700 68
2012 Sep 12 23:49-09:15 303, +13 0.020 873 2800 100
2012 Sep 13 22:25-08:13 286, +18 0.019 959 3600 130
2012 Sep 14 20:57-07:05 267, +22 0.020 954 3100 110
2012 Sep 15 19:41-06:02 251, +23 0.022 868 2000 74
2012 Sep 16 18:42-05:10 238, +23 0.026 753 1100 44
2012 Sep 17 18:00-04:30 229, +23 0.031 645 590 25
2012 Sep 18 17:29-03:59 222, +22 0.036 554 320 15
2012 Sep 19 17:06-03:34 217, +21 0.041 481 180 9
2012 Sep 20 16:47-03:14 213, +20 0.047 423 110 6
2012 Sep 21 16:33-02:58 210, +20 0.053 376 69 4
2012 Sep 22 16:20-02:43 208, +19 0.058 337 45 3
Goldstone SNRs assume Ptx = 435 kW
Goldstone tracks:
UT UT PDT Duration Round-trip
DOY Date TX Window TX Window hh:mm time (sec) SNR/Run
--- ---- --------- --------- --------- --------- -------
257 Sep 13 0430-0615 2130-2315 Sep 12 01:45 20.1 100
259 Sep 15 0110-0310 1810-2010 Sep 14 02:00 19.8 110 BISTATIC WITH DSS-13
NOTE: TXON is shown at the earliest time, which is only 15 min into the precal time.
Proposed Arecibo tracks:
UT UT AST PDT Duration Round-trip
DOY Date TX Window TX Window TX Window hh:mm time (sec) SNR/Run
--- ---- --------- --------- --------- --------- --------- -------
258 Sep 14 2131-2215 1731-1815 Sep 14 1431-1515 Sep 14 00:44 19.6 2300 Also receive at GBT
259 Sep 15 2021-2257 1621-1857 Sep 15 1321-1557 Sep 15 02:36 21.9 1600 Also receive at GBT
260 Sep 16 1924-2201 1524-1801 Sep 16 1224-1501 Sep 16 02:37 25.4 1000 Also receive at GBT
261 Sep 17 1840-2120 1440-1720 Sep 17 1140-1420 Sep 17 02:40 29.8 580
Proposed VLBA tracks (radar speckle experiment, PI = M. W. Busch, Arecibo transmitting)
UT UT AST PDT Duration
DOY Date TX Window TX Window TX Window hh:mm
--- ---- --------- --------- --------- ---------
260 Sep 16 1920-1940 1520-1540 Sep 16 1220-1240 Sep 16 00:20
260 Sep 16 2145-2205 1745-1805 Sep 16 1445-1505 Sep 16 00:20
261 Sep 17 1840-1900 1440-1500 Sep 17 1140-1200 Sep 17 00:20
261 Sep 17 2105-2125 1705-1725 Sep 17 1405-1425 Sep 17 00:20
From Jon Giorgini, 2012 Sep 13:
Folding in 2 delay and 2 Doppler measurements from last
night's Goldstone track with the 1183 optical measurements
now available (2012-Aug-26 to 2012-Sep-13), 2012 QG42
orbit solution #34 was estimated.
Marina, the Doppler residuals look good in thew new global fit:
Measurements Resids std.err
2012 913.256944 61000 19.97273803 -14 Delay -0.116 2.000
2012 913.236111 54000 20.01191094 -14 Delay 1.865 10.000
2012 913.229167 53000 191811.549 -14 Doppler 1.346 1.500
2012 913.215278 51000 196289.173 -14 Doppler 0.963 1.500
Formal 3-sigma X/S-band uncertainties for s34
Date__(UT)__HR:MN POS_3sigma DOP_S_3sig DOP_X_3sig RT_delay_3sig
2012-Sep-12 00:00 0.211 0.76 2.75 0.000028
2012-Sep-13 00:00 0.293 0.51 1.85 0.000007
2012-Sep-14 00:00 0.533 0.29 1.05 0.000010
2012-Sep-15 00:00 0.805 0.64 2.34 0.000019
2012-Sep-16 00:00 0.945 0.90 3.28 0.000042
2012-Sep-17 00:00 0.959 0.98 3.56 0.000074
2012-Sep-18 00:00 0.917 0.98 3.56 0.000108
Predicts have been updated to s34 in the Goldstone and
Arecibo directories as follows:
Arecibo:
PRDX.OUT.01v-01-01.s34 (S-band Arecibo monostatic)
PRDX.OUT.01v-09-01.s34 (S-band Arecibo->GBT bistatic)
PRDX.OUT.01v-99-01.s34 (S-band Arecibo->GEOCENTER bistatic)
DSS-14 (with corresponding "PUNCH" files):
PRDX.OUT.14f-14-14.s34 (X-band DSS-14 monostatic fixed frequency xmit)
PRDX.OUT.14v-14-14.s34 (X-band DSS-14 monostatic variable frequency xmit)
PRDX.OUT.14v-13-13.s34 (X-band DSS-14->DSS-13 bistatic)
PRDX.OUT.01v-99-13.s34 (S-band DSS-13 receive of AO geocenter xmit 01v-99)
PRDX.OUT.01f-01-13.s34 (S-band DSS-13 receive of AO monostatic xmit 01f-01)
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
From Jon Giorgini, 2012-Sep-12:
Updating 2012 QG42 to use the current dataset of 892 optical
measurements (2012-Aug-26 to 2012-Sep-11), orbit solution #22
was estimated and all predicts updated at GSSR and AO.
Last update prior to GSSR track.
Formal 3-sigma S/X-band uncertainties:
Date__(UT)__HR:MN POS_3sigma DOP_S_3sig DOP_X_3sig RT_delay_3sig
2012-Sep-12 00:00 0.715 141.71 515.02 0.031917
2012-Sep-13 00:00 1.341 89.28 324.47 0.027657
2012-Sep-14 00:00 2.202 16.68 60.61 0.025687
2012-Sep-15 00:00 2.820 60.66 220.45 0.026507
2012-Sep-16 00:00 2.908 121.74 442.47 0.029882
2012-Sep-17 00:00 2.675 161.60 587.32 0.035081
2012-Sep-18 00:00 2.372 186.01 676.03 0.041426
Differencing 14f-14-14:
RECEIVER U.T. RANGE DOPPLER LHA DEC RA EL
s22: 2012 SEP 13 04:30 20.0947230546 205158.689 0.2485 12.6206 302.938 67.194
s19: 2012 SEP 13 04:30 20.1019041759 205227.903 0.2494 12.6210 302.937 67.194
------------- ----------
-0.00718112 -69.214
So pointing changed 3.9", Doppler -69 Hz, delay -7181 usec compared to s19.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
From Jon Giorgini, 2012-Sep-10:
Using the 676 optical measurements now available (2012-Aug-26
to 2012-Sep-12), 2012 QC42 orbit solution #19 was estimated and
OSOD w/nominal predicts for GSSR established on pfs4 in the in
/2012qg42 sub-directory.
Formal 3-sigma X-band uncertainties:
Date__(UT)__HR:MN POS_3sigma DOP_X_3sig RT_delay_3sig
2012-Sep-12 00:00 3.078 641.06 0.039568
2012-Sep-13 00:00 5.551 401.23 0.034279
2012-Sep-14 00:00 8.400 71.95 0.031869
2012-Sep-15 00:00 9.983 283.79 0.032961
2012-Sep-16 00:00 9.678 559.11 0.037241
**********************************************************************************************
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%
2012-Sep-10 00:00 336.11777 -0.91615 14.12 0.03303860717221 166.9924 /T 116.0/ 36.4
2012-Sep-11 00:00 329.14760 2.09277 14.02 0.02804541966045 158.6938 /T 133.2/ 27.3
2012-Sep-12 00:00 319.39079 6.21992 13.98 0.02375731055316 147.4309 /T 150.1/ 18.9
2012-Sep-13 00:00 305.80564 11.53890 14.08 0.02060261410217 132.3192 /T 154.9/ 11.5
2012-Sep-14 00:00 288.16499 17.22220 14.44 0.01913555430184 113.6610 /T 135.3/ 5.6
2012-Sep-15 00:00 268.72760 21.42998 15.15 0.01972541814702 94.2149 /T 107.8/ 1.7
2012-Sep-16 00:00 251.39637 23.19623 16.12 0.02220236350046 77.4735 /T 81.7/ 0.2
2012-Sep-17 00:00 238.16898 23.26134 17.17 0.02603044614886 64.7260 /T 60.2/ 1.2
2012-Sep-18 00:00 228.67255 22.62167 n.a. 0.03070885504954 55.3888 /T 45.0/ 5.0
2012-Sep-19 00:00 221.85621 21.80859 n.a. 0.03590968655274 48.4855 /T 38.1/ 11.3
2012-Sep-20 00:00 216.84462 21.02161 n.a. 0.04144171978845 43.2443 /T 40.7/ 19.7
We're going to start with the CW setup below, then do 10 usec and 11 usec
ranging. After that we hope to do imaging.
Here are possible 20 MHz and 40 MHz chirp configurations:
20 MHz chirp:
-------------
pfs sample clock at 40 MHz, PRP=50 us, FFT=1000, ncoh=200, offset +10 Hz
pfs delay-Doppler dimensions: 2000x0.025 us, 1000x0.1 Hz
drcv sample clock at 80 MHz, PRP=50 us, FFT=1000, ncoh=200, offset +10 Hz
drcv delay-Doppler dimensions: 2000x0.025 us, 1000x0.1 Hz)
40 MHz chirp:
-------------
pfs sample clock at 40 MHz, PRP=50 us, FFT=1000, ncoh=200, offset +10 Hz
pfs delay-Doppler dimensions: 2000x0.025 us, 1000x0.1 Hz
drcv sample clock at 80 MHz, PRP=50 us, FFT=1000, ncoh=200, offset +10 Hz
drcv delay-Doppler dimensions: 4000x0.0125 us, 1000x0.1 Hz)
This object has large Doppler uncertainties and we may see a Doppler correction
of up to several hundred Hz.
TX polarization RCP
RCV polarization LCP & RCP
Frequency hops: no hops
Bandwidth: 4000 Hz
Sampling interval: 2500 x 0.1 usec
VME FFT for PSD files: 16384 for 0.24-Hz resolution
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 255
FFT 256
ncoh 6
bandwidth 653.6 Hz
resolution 2.55 Hz
TXOFF +50 Hz -> echo would be centered at 128 + 20 = 148
-------------------------------------------------------------------------
0.125-usec imaging
baud 0.125 usec
code 511
FFT 1024
ncoh 150
bandwidth 104.4 Hz
resolution 0.1 Hz
TXOFF +10 Hz -> echo would be centered at 512 + 98 = 610
_____________________________________________________________________
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 rarg-pfs4 (PLEASE NOTE THE NEW "HOME" for OSOD!):
BPC:
/usr/local/bin/osod/ops/2012qg42/PRDX.OUT.14f-14-14.s34
/PUNCH.OUT.14f-14-14.s34
/EPH.OUT.s34
WFG:
/usr/local/bin/osod/ops/2012qg42/2012qg42/PRDX.OUT.14v-14-14.s34
/PUNCH.OUT.14v-14-14.s34
/EPH.OUT.s34
BISTATIC:
BPC:
/usr/local/bin/osod/ops/2012qg42/PRDX.OUT.14f-13-13.s34
/PUNCH.OUT.14f-13-13.s34
/EPH.OUT.s34
WFG:
/usr/local/bin/osod/ops/2012qg42/2012qg42/PRDX.OUT.14v-13-13.s34
/PUNCH.OUT.14v-13-13.s34
/EPH.OUT.s34
POINTING
TX Offsets
Date (UTC) DOY hhmmss RA Dec Macro LHA Dec RTT OSOD
2012 09 15 259 010000 268.1083 21.5233 A 19.7 s34
2012 09 15 259 020000 267.2943 21.6411 A 19.8
2012 09 15 259 030000 266.4851 21.7515 A 4.50 0.60 19.9
2012 09 15 259 040000 265.6832 21.8547 A 19.9
2012 09 15 259 050000 264.8908 21.9511 A 20.0
Transmit offsets are given in millidegrees.
PRDX.OUT.14f-14-14.s34
TRANSMITTER: STATION #14, RECEIVER: STATION #14
RECEIVER U.T. RANGE DOPPLER LHA DEC RA EL
2012 SEP 15 01:00 19.7197078101 -161094.132 344.4060 21.5233 268.108 70.528
2012 SEP 15 01:10 19.7310783943 -163347.972 347.0487 21.5435 267.972 72.084
2012 SEP 15 01:20 19.7426072247 -165609.079 349.6914 21.5634 267.837 73.464
2012 SEP 15 01:30 19.7542947436 -167875.395 352.3339 21.5831 267.701 74.619
2012 SEP 15 01:40 19.7661412337 -170144.850 354.9764 21.6027 267.565 75.495
2012 SEP 15 01:50 19.7781468472 -172415.362 357.6188 21.6220 267.430 76.040
2012 SEP 15 02:00 19.7903115898 -174684.843 0.2610 21.6411 267.294 76.213
2012 SEP 15 02:10 19.8026353063 -176951.204 2.9032 21.6600 267.159 76.002
2012 SEP 15 02:20 19.8151177096 -179212.358 5.5451 21.6787 267.024 75.423
2012 SEP 15 02:30 19.8277583669 -181466.227 8.1869 21.6972 266.889 74.518
2012 SEP 15 02:40 19.8405566851 -183710.743 10.8286 21.7155 266.754 73.341
2012 SEP 15 02:50 19.8535119419 -185943.855 13.4700 21.7336 266.620 71.945
2012 SEP 15 03:00 19.8666232665 -188163.535 16.1113 21.7515 266.485 70.378
2012 SEP 15 03:10 19.8798896470 -190367.776 18.7524 21.7692 266.351 68.679
2012 SEP 15 03:20 19.8933099320 -192554.604 21.3932 21.7867 266.217 66.877
2012 SEP 15 03:30 19.9068828327 -194722.076 24.0339 21.8040 266.083 64.996
2012 SEP 15 03:40 19.9206069208 -196868.288 26.6743 21.8211 265.950 63.054
2012 SEP 15 03:50 19.9344806501 -198991.376 29.3144 21.8380 265.816 61.063
2012 SEP 15 04:00 19.9485023264 -201089.525 31.9543 21.8547 265.683 59.034
2012 SEP 15 04:10 19.9626701489 -203160.966 34.5940 21.8713 265.550 56.976
2012 SEP 15 04:20 19.9769821760 -205203.985 37.2333 21.8876 265.418 54.895
2012 SEP 15 04:30 19.9914363570 -207216.924 39.8724 21.9038 265.286 52.795
2012 SEP 15 04:40 20.0060305366 -209198.185 42.5112 21.9197 265.154 50.682
2012 SEP 15 04:50 20.0207624314 -211146.235 45.1496 21.9355 265.022 48.558
2012 SEP 15 05:00 20.0356296661 -213059.607 47.7878 21.9511 264.891 46.426
2012 QG42 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) 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/2012QG42/2012QG42_planning.html
Asteroid Radar Astronomy