(251346) 2007 SJ Goldstone Radar Observations Planning
(251346) 2007 SJ was discovered by LINEAR on September 17, 2007. It has an absolute magnitude of 16.8, suggesting a diameter within a factor of two of 1.5 km. Lightcurves obtained recently by Brian Warner have revealed a rotation period of 2.7 hours and a modest lightcurve amplitude of about 0.15 magnitudes, suggesting a shape with a low elongation. Recent photometric colors obtained by Carl Hergenrother (Univ. of Arizona) suggest that this asteroid is an S/Q type. Roughly 2/3 of near-Earth asteorids with rotation periods this fast have satellites, although to date, nobody has seen evidence for one with this asteroid. This object will be brighter than 16th magnitude from late November until mid-January. It should be a good target for BVRI colors and spectroscopy. 2007 SJ will approach within 0.049 AU (18.9 lunar distances) on January 21, 2014. This object will probably be a strong radar imaging target at both Goldstone and Arecibo. Two tracks are scheduled at Goldstone on January 18 and 19. The dates for the Arecibo observations aren't available yet, but between Jan. 11-19 are likely. UPDATE REGARDING ARECIBO: all radar tracks at Arecibo have been cancelled while the telesope is undergoing an engineering evaluation after the magnitude 6.4 earthquake that occured on January 13, 2014. 2007 SJ 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 2.015 AU
eccentricity 0.534
inclination 8.2 deg
perihelion distance 0.939 AU
aphelion distance 3.090 AU
absolute magnitude (H) 16.8
diameter 1.5 km (+/- a factor of two)
rotation period 2.7 h (Brian Warner, Carl Hergenrother, pers. comm.)
lightcurve amplitude 0.15 mag (Brian Warner, pers. comm.)
0.27 mag (Carl Hergenrother, pers. comm.)
pole direction unknown
spectral class S/Q (Carl Hergenrother, pers. comm.)
Future Close-approaches through 2100:
Date (CT) Body CA Dist MinDist MaxDist Vrel TCA3Sg Nsigs P_i/p
A.D. 2014 Jan 21.65220 Earth .048628 .048627 .048629 9.231 0.46 2.18E5 .000000
A.D. 2034 Feb 25.01175 Earth .082050 .082044 .082056 10.884 1.76 2.69E5 .000000
A.D. 2042 Jan 08.56571 Thisb .042345 .042339 .042352 11.660 0.24 34014. .000000
A.D. 2092 Mar 06.16113 Eunom .046741 .046739 .046744 9.893 0.30 85860. .000000
Last update: 2014 Jan 17
M.P.E.C. 2007-S17 Issued 2007 Sept. 19, 03:01 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.cfa.harvard.edu/iau/mpc.html ISSN 1523-6714
2007 SJ
Observations:
K07S00J* C2007 09 17.18208 22 26 20.10 -00 27 00.3 19.5 ES017704
K07S00J C2007 09 17.19431 22 26 19.06 -00 27 05.2 20.0 ES017704
K07S00J C2007 09 17.20651 22 26 18.02 -00 27 09.4 19.9 ES017704
K07S00J C2007 09 17.21899 22 26 16.99 -00 27 13.5 19.6 ES017704
K07S00J C2007 09 17.97964 22 25 15.87 -00 31 51.7 ES017J95
K07S00J C2007 09 17.98383 22 25 15.53 -00 31 52.9 ES017J95
K07S00J C2007 09 17.98783 22 25 15.17 -00 31 54.8 19.7 R ES017J95
K07S00J C2007 09 18.79621 22 24 11.05 -00 36 49.7 ES017A17
K07S00J C2007 09 18.80825 22 24 10.03 -00 36 53.7 ES017A17
K07S00J C2007 09 18.82040 22 24 09.05 -00 36 57.9 ES017A17
K07S00J C2007 09 18.83466 22 24 07.92 -00 37 03.6 19.4 ES017B15
K07S00J C2007 09 18.83873 22 24 07.59 -00 37 05.1 19.6 ES017B15
K07S00J C2007 09 18.84196 22 24 07.35 -00 37 06.5 19.5 ES017B15
K07S00J C2007 09 18.86736 22 24 05.29 -00 37 14.2 18.6 R ES017B04
K07S00J C2007 09 18.87166 22 24 04.95 -00 37 16.0 18.8 R ES017B04
K07S00J C2007 09 18.87595 22 24 04.62 -00 37 17.6 18.8 R ES017B04
K07S00J C2007 09 18.88373 22 24 03.94 -00 37 20.1 18.7 R ES017B04
K07S00J C2007 09 18.93308 22 23 59.91 -00 37 38.1 19.0 R ES017473
K07S00J C2007 09 18.93883 22 23 59.45 -00 37 39.7 18.9 R ES017473
K07S00J C2007 09 18.94745 22 23 58.78 -00 37 42.9 19.1 R ES017473
K07S00J C2007 09 19.07847 22 23 48.78 -00 38 30.7 19.8 R ES017850
K07S00J C2007 09 19.09543 22 23 47.30 -00 38 37.2 19.0 R ES017850
Observer details:
473 Remanzacco. Observers L. Donato, M. Gonano, V. Gonano, E. Guido,
V. Santini, G. Sostero. 0.45-m f/4.4 Newtonian reflector + CCD.
704 Lincoln Laboratory ETS, New Mexico. Observers M. Bezpalko, D. Torres,
R. Kracke, G. Spitz, J. Kistler. Measurers J. Stuart, S. Scruggs. 1.0-m
f/2.15 reflector + CCD.
850 Cordell-Lorenz Observatory, Sewanee. Observers D. T. Durig, M. C. House,
A. M. Wright, T. Yu, A. Papp, N. A. Oscar, H. E. D. 0.35-m f/8.2
Ritchey-Chretien + 1Kx1K CCD.
A17 Guidestar Observatory, Weinheim. Observers M. Emmerich, S. Melchert.
0.36-m f/6 Schmidt-Cassegrain + CCD.
B04 Saint-Barthelemy Observatory. Observer A. Carbognani. 0.81-m f/7.9
reflector + CCD.
B15 Inastars Observatory, Potsdam (since 2006). Observer B. Thinius. 0.36-m
f/7.5 Schmidt-Cassegrain + CCD.
J95 Great Shefford. Observer P. Birtwhistle. 0.40-m f/6.0 Schmidt-Cassegrain
+ CCD.
Orbital elements:
2007 SJ PHA, Earth MOID = 0.0153 AU
Epoch 2007 Oct. 27.0 TT = JDT 2454400.5 MPC
M 298.11372 (2000.0) P Q
n 0.33808733 Peri. 173.30378 -0.47977149 -0.87036654
a 2.0407202 Node 305.30915 +0.79856272 -0.38084288
e 0.5269522 Incl. 7.80506 +0.36347888 -0.31212304
P 2.92 H 16.2 G 0.15 U 9
Residuals in seconds of arc
070917 704 0.4+ 0.3+ 070918 A17 0.6- 0.4- 070918 B04 0.5- 0.5+
070917 704 0.0 0.1- 070918 A17 0.6- 0.2- 070918 473 0.4- 0.5+
070917 704 0.5- 0.1+ 070918 B15 0.1+ 0.5- 070918 473 0.3- 1.0+
070917 704 0.4- 0.5+ 070918 B15 0.1+ 0.5- 070918 473 0.1+ 0.9+
070917 J95 0.2+ 0.1- 070918 B15 0.4+ 0.7- 070919 850 1.3+ 0.0
070917 J95 0.3+ 0.2+ 070918 B04 0.2- 0.4+ 070919 850 0.3- 0.3-
070917 J95 0.2- 0.3- 070918 B04 0.1- 0.2+
070918 A17 0.1+ 0.8- 070918 B04 0.2+ 0.1+
Ephemeris:
2007 SJ a,e,i = 2.04, 0.53, 8 q = 0.9654
Date TT R. A. (2000) Decl. Delta r Elong. Phase V
2007 09 17 22 26.58 -00 25.8 1.334 2.312 162.4 7.6 19.2
2007 09 27 22 13.92 -01 26.6 1.331 2.257 150.2 12.7 19.3
2007 10 07 22 03.66 -02 23.3 1.352 2.200 138.1 17.7 19.5
2007 10 17 21 56.73 -03 09.2 1.392 2.141 126.6 22.0 19.6
2007 10 27 21 53.57 -03 40.1 1.444 2.079 115.9 25.5 19.8
2007 11 06 21 54.14 -03 53.7 1.503 2.016 106.1 28.2 19.9
2007 11 16 21 58.23 -03 49.4 1.564 1.951 97.1 30.2 19.9
2007 11 26 22 05.50 -03 27.0 1.623 1.884 88.9 31.6 20.0
2007 12 06 22 15.57 -02 47.0 1.677 1.815 81.5 32.5 20.0
2007 12 16 22 28.16 -01 49.9 1.724 1.744 74.7 33.0 20.0
2007 12 26 22 43.01 -00 36.3 1.761 1.672 68.5 33.2 19.9
2008 01 05 22 59.95 +00 53.2 1.788 1.599 62.8 33.2 19.9
Sonia Keys (C) Copyright 2007 MPC M.P.E.C. 2007-S17
2007 SJ
D = 1.5 km
P = 2.7 h
OC albedo = 0.1 (a relatively conservative lower bound)
UTC SNR/ SNR/
w DOY start date window RA, dec dist runs day run
01 003 2014 Jan 03 17:43-05:25 340, +34 0.106 201 49 4
01 004 2014 Jan 04 17:36-05:14 339, +33 0.101 208 58 4
01 005 2014 Jan 05 17:29-05:02 337, +32 0.097 217 69 5
02 006 2014 Jan 06 17:21-04:50 336, +31 0.092 225 83 6
02 007 2014 Jan 07 17:14-04:37 334, +31 0.088 235 100 7
02 008 2014 Jan 08 17:06-04:24 333, +29 0.084 244 120 8
02 009 2014 Jan 09 16:58-04:09 331, +28 0.080 255 150 10
02 010 2014 Jan 10 16:50-03:53 329, +27 0.076 266 180 12
02 011 2014 Jan 11 16:41-03:35 327, +25 0.072 277 220 15
02 012 2014 Jan 12 16:32-03:17 324, +23 0.068 288 280 18
03 013 2014 Jan 13 16:23-02:56 322, +21 0.064 299 340 21
03 014 2014 Jan 14 16:15-02:34 319, +19 0.061 309 420 26
03 015 2014 Jan 15 16:06-02:10 316, +16 0.058 317 510 31
03 016 2014 Jan 16 15:57-01:44 312, +13 0.055 324 610 37
03 017 2014 Jan 17 15:48-01:16 309, +9 0.053 327 720 43
03 018 2014 Jan 18 15:40-00:46 305, +5 0.051 326 810 48 Scheduled
03 019 2014 Jan 19 15:32-00:13 301, +1 0.050 320 870 53 Scheduled
04 020 2014 Jan 20 15:26-23:39 297, -3 0.049 308 890 56 Moves too far south for Arecibo to track
04 021 2014 Jan 21 15:20-23:02 293, -8 0.049 290 860 56
04 022 2014 Jan 22 15:16-22:24 288, -12 0.049 266 780 53
04 023 2014 Jan 23 15:14-21:44 284, -16 0.050 238 670 47
04 024 2014 Jan 24 15:13-21:03 280, -20 0.051 207 540 41
04 025 2014 Jan 25 15:14-20:21 275, -24 0.053 175 410 34
04 026 2014 Jan 26 15:18-19:37 271, -27 0.056 141 300 27
05 027 2014 Jan 27 15:26-18:51 268, -30 0.059 106 210 21
05 028 2014 Jan 28 15:41-18:00 264, -33 0.062 68 140 17
After January 28, 2007 SJ moves too far south for Goldstone to track.
Not scheduled on other dates around the closest approach due to conflicts with the Rosetta mission.
Goldstone SNRs assume Ptx = 450 kW
Arecibo SNRs
UTC SNR/ SNR/
start date window RA, dec dist runs date run
2014 Jan 01 19:44-21:19 342, +35 0.115 24 220 49
2014 Jan 02 19:32-21:14 341, +34 0.111 27 280 59
2014 Jan 03 19:21-21:09 340, +34 0.106 30 350 72
2014 Jan 04 19:09-21:04 339, +33 0.102 33 440 86
2014 Jan 05 18:56-20:58 338, +32 0.097 37 560 100
2014 Jan 06 18:43-20:51 336, +32 0.093 41 690 120
2014 Jan 07 18:30-20:45 335, +31 0.089 45 870 140
2014 Jan 08 18:16-20:37 333, +30 0.084 49 1100 160
2014 Jan 09 18:02-20:29 331, +28 0.080 54 1400 200
2014 Jan 10 17:47-20:19 329, +27 0.076 60 1700 230
2014 Jan 11 17:32-20:09 327, +25 0.072 64 2200 280
2014 Jan 12 17:17-19:58 325, +24 0.068 70 2700 340
2014 Jan 13 17:01-19:45 322, +22 0.065 75 3400 410
2014 Jan 14 16:45-19:30 319, +19 0.061 76 4100 490
2014 Jan 15 16:30-19:12 316, +16 0.058 82 5200 590
2014 Jan 16 16:16-18:52 313, +13 0.055 84 6100 700
2014 Jan 17 16:04-18:28 309, +10 0.053 82 6900 800
2014 Jan 18 15:55-17:58 305, +6 0.051 71 7200 920
2014 Jan 19 15:54-17:19 301, +2 0.050 51 5700 880
Arecibo SNRs assume Ptx = 900 kw. Current transmitter power is closer to 600 kW.
This object will be an excellent imaging target at Arecibo, where it should be
possible to obtain images with resolutions as fine as 7.5 meters/pixel.
DAY START BOT EOT END FACILITY USER ACTIVITY
018 1940 2110 0045 0115 DSS-14 GSSR AST 2007 SJ
019 1405 1535 2015 2045 DSS-14 GSSR AST 2007 SJ
Goldstone tracks:
UT UT PST Duration Round-trip SNR/
DOY Date TX Window TX Window hh:mm time (sec) /Run
--- ---- --------- --------- --------- --------- ----
18-19 Jan 18-19 2010-0045 1210-1645 Jan 18 4:35 51 48
19 Jan 19 1525-2015 0725-1215 Jan 19 4:50 50 53
These are actual times when we have radiation clearance.
Arecibo tracks:
All 2007 SJ tracks at Arecibo have been cancelled due to damage at the telescope after the magnitude 6.4
earthquake in Puerto Rico on January 13, 2014.
From Jon Giorgini, 2014 Jan. 17: New optical was used to update the orbit solution for 251346 (2007 SJ); s129 is based on 852 measurements spanning 1990-Oct-14 to 2014-Jan-13. Formal 3-sigma X-band uncertainties for s129: Date__(UT)__HR:MN POS_3sigma DOP_X_3sig RT_delay_3sig 2014-Jan-17 00:00 0.959 2.11 0.000330 2014-Jan-18 00:00 1.066 2.44 0.000318 2014-Jan-19 00:00 1.173 2.76 0.000305 2014-Jan-20 00:00 1.275 3.04 0.000290 2014-Jan-21 00:00 1.361 3.25 0.000274 Pointing and Doppler uncertainties duriung the track are reduced to about 1/3 that of the prior solution. Files have been updated on aardvark and the set-up checked again. It all looks squared away. - - - - - - - - - - From Horizons, 2013 Nov 21, Solution 98, # obs: 538 (1990-2013) Date__(UT)__HR:MN R.A._(J2000.0)_DEC. delta POS_3sigma DOP_S_3sig DOP_X_3sig RT_delay_3sig 2014-Jan-10 00:00 *m 330.59722 28.07359 0.07939910903306 3.353 1.41 5.13 0.000899 2014-Jan-11 00:00 *m 328.52971 26.63968 0.07530079151710 3.671 1.67 6.08 0.000854 2014-Jan-12 00:00 *m 326.27071 24.98967 0.07133377152866 4.023 1.98 7.19 0.000803 2014-Jan-13 00:00 *m 323.80409 23.08864 0.06753030257102 4.408 2.33 8.47 0.000743 2014-Jan-14 00:00 *m 321.11499 20.89927 0.06392850607559 4.822 2.73 9.93 0.000676 2014-Jan-15 00:00 * 318.19099 18.38422 0.06057296227566 5.256 3.18 11.54 0.000603 2014-Jan-16 00:00 * 315.02371 15.51038 0.05751489286499 5.694 3.65 13.27 0.000529 2014-Jan-17 00:00 * 311.61072 12.25531 0.05481154998489 6.114 4.14 15.03 0.000468 2014-Jan-18 00:00 * 307.95758 8.61591 0.05252432042825 6.480 4.59 16.69 0.000439 2014-Jan-19 00:00 * 304.07975 4.61803 0.05071508410226 6.751 4.97 18.05 0.000465 2014-Jan-20 00:00 * 300.00401 0.32419 0.04944068904711 6.888 5.21 18.92 0.000551 2014-Jan-21 00:00 * 295.76884 -4.16487 0.04874611447040 6.858 5.26 19.12 0.000679 2014-Jan-22 00:00 * 291.42331 -8.71817 0.04865780740512 6.651 5.11 18.59 0.000827 2014-Jan-23 00:00 * 287.02442 -13.19222 0.04917923762581 6.284 4.78 17.38 0.000979 2014-Jan-24 00:00 * 282.63304 -17.45344 0.05029030279424 5.794 4.31 15.68 0.001125 2014-Jan-25 00:00 * 278.30917 -21.39739 0.05195082132465 5.233 3.77 13.71 0.001258 --> Pointing uncertainties for this object are fine. 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-Dec-01 00:00 2.62838 41.78882 0.24791639908597 15.82 123.1101 /T 138.6/ 5.6 2013-Dec-02 00:00 1.99354 41.68186 0.24385641966884 15.80 121.9200 /T 129.8/ 1.5 2013-Dec-03 00:00 1.36819 41.56843 0.23982058442470 15.78 120.7267 /T 118.9/ 0.1 2013-Dec-04 00:00 0.75241 41.44894 0.23580437161970 15.77 119.5306 /T 106.8/ 1.5 2013-Dec-05 00:00 0.14611 41.32378 0.23180327846600 15.75 118.3320 /T 94.2/ 5.9 2013-Dec-06 00:00 359.54908 41.19330 0.22781287131482 15.74 117.1313 /T 81.6/ 12.9 2013-Dec-07 00:00 358.96091 41.05782 0.22382884371298 15.72 115.9285 /T 69.4/ 21.9 2013-Dec-08 00:00 358.38107 40.91761 0.21984707121198 15.70 114.7238 /T 58.1/ 32.2 2013-Dec-09 00:00 357.80888 40.77289 0.21586365444359 15.69 113.5168 /T 48.2/ 43.1 2013-Dec-10 00:00 357.24350 40.62379 0.21187494752545 15.67 112.3075 /T 40.6/ 54.1 2013-Dec-11 00:00 356.68397 40.47037 0.20787757367296 15.66 111.0953 /T 36.4/ 64.6 2013-Dec-12 00:00 356.12922 40.31265 0.20386843206970 15.64 109.8798 /T 36.4/ 74.3 2013-Dec-13 00:00 355.57805 40.15051 0.19984469988926 15.62 108.6604 /T 40.5/ 82.6 2013-Dec-14 00:00 355.02913 39.98381 0.19580383213553 15.61 107.4361 /T 47.4/ 89.5 2013-Dec-15 00:00 354.48101 39.81228 0.19174356070878 15.59 106.2063 /T 55.9/ 94.7 2013-Dec-16 00:00 353.93213 39.63557 0.18766189329826 15.57 104.9697 /T 65.4/ 98.2 2013-Dec-17 00:00 353.38078 39.45323 0.18355711239318 15.55 103.7253 /T 75.3/ 99.8 2013-Dec-18 00:00 352.82512 39.26469 0.17942777474205 15.54 102.4716 /T 85.3/ 99.5 2013-Dec-19 00:00 352.26315 39.06927 0.17527271176158 15.52 101.2072 /T 95.4/ 97.5 2013-Dec-20 00:00 351.69270 38.86615 0.17109103152432 15.50 99.9303 /T 105.4/ 93.9 2013-Dec-21 00:00 351.11145 38.65437 0.16688212293037 15.48 98.6391 /T 115.1/ 88.6 2013-Dec-22 00:00 350.51685 38.43279 0.16264566249479 15.47 97.3314 /T 124.2/ 82.0 2013-Dec-23 00:00 349.90613 38.20011 0.15838162390270 15.45 96.0048 /T 132.5/ 74.2 2013-Dec-24 00:00 349.27630 37.95478 0.15409029021739 15.43 94.6567 /T 139.2/ 65.4 2013-Dec-25 00:00 348.62408 37.69502 0.14977226845397 15.41 93.2839 /T 143.3/ 55.9 2013-Dec-26 00:00 347.94587 37.41878 0.14542850628121 15.40 91.8832 /T 143.6/ 45.8 2013-Dec-27 00:00 347.23777 37.12366 0.14106031101711 15.38 90.4507 /T 139.7/ 35.6 2013-Dec-28 00:00 346.49545 36.80692 0.13666937204736 15.36 88.9822 /T 132.3/ 25.7 2013-Dec-29 00:00 345.71415 36.46533 0.13225778955743 15.35 87.4726 /T 122.4/ 16.6 2013-Dec-30 00:00 344.88860 36.09517 0.12782811504858 15.34 85.9166 /T 110.9/ 8.9 2013-Dec-31 00:00 344.01293 35.69209 0.12338341194133 15.33 84.3077 /T 98.3/ 3.4 2014-Jan-01 00:00 343.08058 35.25097 0.11892734603788 15.32 82.6387 /T 85.2/ 0.5 2014-Jan-02 00:00 342.08421 34.76578 0.11446431361780 15.31 80.9012 /T 71.9/ 0.6 2014-Jan-03 00:00 341.01560 34.22937 0.10999960885842 15.31 79.0855 /T 59.2/ 3.8 2014-Jan-04 00:00 339.86555 33.63322 0.10553962522783 15.31 77.1804 /T 47.8/ 9.7 2014-Jan-05 00:00 338.62385 32.96721 0.10109208319690 15.32 75.1728 /T 39.1/ 17.8 2014-Jan-06 00:00 337.27922 32.21926 0.09666628211989 15.33 73.0478 /T 34.9/ 27.5 2014-Jan-07 00:00 335.81928 31.37501 0.09227338441307 15.36 70.7881 /T 36.7/ 37.9 2014-Jan-08 00:00 334.23056 30.41742 0.08792674899117 15.40 68.3739 /T 43.4/ 48.5 2014-Jan-09 00:00 332.49854 29.32637 0.08364233435584 15.45 65.7826 /T 53.0/ 58.9 2014-Jan-10 00:00 330.60779 28.07823 0.07943918945050 15.53 62.9888 /T 64.2/ 68.6 2014-Jan-11 00:00 328.54216 26.64558 0.07534004298981 15.63 59.9645 /T 76.4/ 77.3 2014-Jan-12 00:00 326.28522 24.99710 0.07137198797605 15.77 56.6794 /T 89.0/ 84.9 2014-Jan-13 00:00 323.82088 23.09790 0.06756723280125 16. 53.1029 /T 102.1/ 91.0 2014-Jan-14 00:00 321.13424 20.91070 0.06396384585814 16. 49.2064 /T 115.5/ 95.6 2014-Jan-15 00:00 318.21288 18.39818 0.06060634760959 17. 44.9697 /T 128.9/ 98.6 2014-Jan-16 00:00 315.04837 15.52717 0.05754589689826 17. 40.3900 /T 142.0/ 99.8 2014-Jan-17 00:00 311.63824 12.27515 0.05483968733787 18. 35.4993 /T 153.1/ 99.2 2014-Jan-18 00:00 307.98796 8.63887 0.05254906363376 18. 30.3949 /T 157.9/ 97.0 2014-Jan-19 00:00 304.11289 4.64393 0.05073589632000 19. 25.2954 /T 151.7/ 93.0 2014-Jan-20 00:00 300.03971 0.35250 0.04945707364090 21. 20.6496 /L 138.8/ 87.4 2014-Jan-21 00:00 295.80673 -4.13498 0.04875767496535 22. 17.2995 /L 123.1/ 80.4 2014-Jan-22 00:00 291.46292 -8.68778 0.04866430330667 22. 16.3842 /L 106.3/ 72.1 2014-Jan-23 00:00 287.06519 -13.16249 0.04918061828420 21. 18.3206 /L 88.9/ 62.7 2014-Jan-24 00:00 282.67436 -17.42543 0.05028670752710 20. 22.2247 /L 71.2/ 52.5 2014-Jan-25 00:00 278.35040 -21.37190 0.05194254713522 19. 27.0101 /L 53.5/ 41.8 2014-Jan-26 00:00 274.14787 -24.93639 0.05409425185363 18. 32.0169 /L 36.0/ 31.2 2014-Jan-27 00:00 270.11223 -28.09239 0.05668107493525 17. 36.9154 /L 19.6/ 21.2 2014-Jan-28 00:00 266.27784 -30.84493 0.05964143875623 17. 41.5534 /L 11.5/ 12.5 2014-Jan-29 00:00 262.66743 -33.22041 0.06291715416533 17. 45.8703 /L 23.0/ 5.7 2014-Jan-30 00:00 259.29296 -35.25685 0.06645578789743 16. 49.8540 /L 39.5/ 1.5 2014-Jan-31 00:00 256.15729 -36.99660 0.07021157181642 16. 53.5169 /L 56.5/ 0.2
With a rotation period of 2.7 hours, this object could have a bandwidth of 50-60 Hz if
the diameter is about 1.5 km. The SNRs will be pretty strong so we're going to start
with the following CW setup:
CW setup:
---------------------------------------------------------------------------
TX polarization RCP
RCV polarization LCP & RCP
Frequency hops: no hops (+0.5 kHz offset)
Bandwidth: 4000 Hz
Sampling interval: 2500 x 0.1 usec
PFS FFT: 1024 for 3.9 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 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
____________________________________________________________________
OSOD and predicts are aardvark:
Monostatic with the new waveform generator:
/export/data3/osod/ops/2007sj/PRDX.OUT.14v-14-14.s129
/PUNCH.OUT.14v-14-14.s129
/EPH.OUT.s129
POINTING
TX Offsets
Date (UTC) DOY hhmmss RA Dec Macro LHA Dec RTT OSOD
2014 JAN 18 18 200000 304.947 5.3550 A 2.500 -2.400 50.9 s129
2014 JAN 18 18 210000 304.772 5.1833 A 2.500 -2.500 50.8
2014 JAN 18 18 220000 304.598 5.0107 A 2.500 -2.400 50.7
2014 JAN 18 18 230000 304.424 4.8375 A 2.500 -2.400 50.7
2014 JAN 19 19 000000 304.252 4.6636 A 2.400 -2.400 50.6
2014 JAN 19 19 010000 304.081 4.4891 A 2.400 -2.400 50.6
Transmit offsets are given in millidegrees.
PRDX.OUT.14f-14-14.s129
...Not available yet...
2007 SJ 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/2007SJ/2007SJ_planning.html
Asteroid Radar Astronomy