1998 CS1 Goldstone Radar Observations Planning
(136849) 1998 CS1 was discovered by A. Nakamura at Kuma Kogen Observatory (Japan) on February 9, 1998. It will approach within 0.0291 AU (11.3 lunar distances) on January 17, 2009. Its absolute magnitude of 17.7 suggests a diameter within a factor of two of 0.9 km. Spectroscopy obtained by M. D. Hicks and K. Lawrence at Palomar indicates that it's an Sq-type object. Lightcurves obtained by Joe Pollock (Appalachian State University) reveal a 2.6-hour rotation period with an amplitude of about 0.2 magnitudes, suggestive of a shape with low-to-moderate elongation. Subsequent lightcurves obtained by Michael Hicks and Heath Rhoades at Table Mountain Observatory have revealed a consistent synodic rotation period of 2.7 hours. Goldstone observations are scheduled on January 13, 14, 17, 18, and 22. Arecibo observations are scheduled on January 14-21. This object will brighten to about 12th magnitude in mid-January and it will be a good target for photometric and spectroscopic observations. 1998 CS1 has been classified as a "Potentially Hazardous Asteroid" by the Minor Planet Center.
Orbital and Physical Characteristics
orbit type Apollo
semimajor axis 1.493 AU
eccentricity 0.579
inclination 7.8°
perihelion distance 0.629 AU
aphelion distance 2.357 AU
absolute magnitude (H) 17.7
diameter 900 meters +- a factor of two
rotation period 2.6 h (J. Pollock, pers. comm.)
2.7 h (M. D. Hicks and H. Rhoades, pers. comm.)
pole direction unknown
lightcurve amplitude ~0.2 mag (J. Pollock, M. D. Hicks, H. Rhoades, pers. comm.)
spectral class Sq (M. D. Hicks and K. Lawrence, pers. comm.)
Last update: 2009 January 18
M.P.E.C. 1998-C27 Issued 1998 Feb. 13, 15:36 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.
BMARSDEN@CFA.HARVARD.EDU or GWILLIAMS@CFA.HARVARD.EDU
URL http://cfa-www.harvard.edu/iau/mpc.html
1998 CS1
Observations:
J98C01S* C1998 02 09.47453 02 10 13.61 +17 40 40.7 327
J98C01S C1998 02 09.50193 02 10 07.30 +17 40 51.0 327
J98C01S C1998 02 09.51060 02 10 05.38 +17 40 54.4 18.2 327
J98C01S C1998 02 10.78862 02 05 18.01 +17 48 59.7 17.6 V 046
J98C01S C1998 02 10.79144 02 05 17.34 +17 49 00.9 046
J98C01S C1998 02 10.79362 02 05 16.79 +17 49 01.6 046
J98C01S C1998 02 10.79557 02 05 16.35 +17 49 02.9 046
J98C01S C1998 02 10.79686 02 05 16.11 +17 49 03.3 046
J98C01S C1998 02 11.44410 02 02 47.92 +17 53 03.8 360
J98C01S FC1998 02 11.44753 02 02 47.47 +17 53 04.2 327
J98C01S C1998 02 11.44861 02 02 46.84 +17 53 06.2 360
J98C01S FC1998 02 11.45455 02 02 45.65 +17 53 06.1 327
J98C01S C1998 02 11.45625 02 02 45.02 +17 53 07.2 360
J98C01S C1998 02 11.46076 02 02 43.87 +17 53 09.4 360
J98C01S C1998 02 11.74847 02 01 37.96 +17 54 47.3 18.0 V 104
J98C01S C1998 02 11.75116 02 01 37.41 +17 54 48.5 104
J98C01S C1998 02 11.75382 02 01 36.81 +17 54 49.0 104
J98C01S C1998 02 11.75995 02 01 35.38 +17 54 52.6 104
J98C01S C1998 02 11.76262 02 01 34.82 +17 54 53.2 104
J98C01S C1998 02 13.45052 01 54 57.44 +18 03 56.8 18.4 327
J98C01S C1998 02 13.46140 01 54 54.68 +18 03 59.2 327
J98C01S C1998 02 13.46936 01 54 52.65 +18 04 00.4 327
Observer details:
046 Klet. Observers M. Tichy, Z. Moravec. Measurer M. Tichy. 0.57-m f/5.2
reflector + CCD.
104 San Marcello Pistoiese. Observers L. Tesi, A. Boattini. Measurers
A. Boattini, G. Forti, L. Tesi. 0.40-m f/5 reflector + CCD.
327 Peking Observatory, Xinglong Station. Observers J. Zhu, Y. J. Chen,
Z. Y. Zheng. Measurers Y. J. Chen, X. Y. Li. 0.6-m Schmidt + CCD.
360 Kuma Kogen. Observer A. Nakamura. 0.60-m f/6.0 Ritchey-Chretien + CCD.
Orbital elements:
1998 CS1
Epoch 1998 Jan. 27.0 TT = JDT 2450840.5 Williams
M 325.77751 (2000.0) P Q
n 0.55576277 Peri. 96.97617 -0.87043647 +0.47652103
a 1.4651309 Node 111.54754 -0.48760637 -0.80006224
e 0.5670136 Incl. 7.63422 -0.06767853 -0.36445593
P 1.77 H 17.0 G 0.15
From 22 observations 1998 Feb. 9-13.
Ephemeris:
1998 CS1 a,e,i = 1.47, 0.57, 8 q = 0.6344
Date TT R. A. (2000) Decl. Delta r Elong. Phase V
1998 02 06 02 22.86 +17 16.4 0.319 0.994 82.1 79.4 17.3
1998 02 11 02 04.52 +17 50.6 0.312 0.945 73.1 88.4 17.5
1998 02 16 01 44.49 +18 14.7 0.305 0.896 63.9 98.3 17.7
1998 02 21 01 21.82 +18 19.6 0.299 0.849 54.1 109.3 18.2
1998 02 26 00 55.84 +17 52.9 0.295 0.803 43.7 121.6 18.8
1998 03 03 00 26.74 +16 41.1 0.295 0.760 32.9 135.0 20.0
.
.
.
1999 01 27 00 22.98 -04 37.7 2.670 2.289 57.1 21.2 22.0
Gareth V. Williams (C) Copyright 1998 MPC M.P.E.C. 1998-C27
Target Name: 1998 CS1
HMag: 17.7
Diameter: 0.9 km (an educated guess for its absolute magnitude and assuming an S-class optical albedo)
Period: 2.2 h (a conservative guess; unlikely to be faster than this)
Goldstone SNRs
UTC LST # max
start date window window RA, dec dist runs SNR SNR/run
-----------------------------------------------------------------------------
2009 Jan 12 04:40-15:23 04:20-15:04 145, 21 0.064 262 56 4
2009 Jan 13 04:50-15:47 04:34-15:32 150, 23 0.055 305 106 7
2009 Jan 14 05:08-16:23 04:56-16:13 158, 25 0.046 362 214 12
2009 Jan 15 05:38-17:18 05:30-17:12 169, 28 0.038 432 452 24
2009 Jan 16 06:31-18:36 06:27-18:34 187, 30 0.032 505 891 43
2009 Jan 17 07:58-20:06 07:58-20:08 211, 29 0.029 538 1265 59
2009 Jan 18 09:45-21:16 09:49-21:22 235, 24 0.031 497 1026 50
2009 Jan 19 11:14-21:57 11:22-22:07 252, 18 0.036 417 551 29
2009 Jan 20 12:15-22:20 12:27-22:34 263, 12 0.043 341 260 15
2009 Jan 21 12:54-22:33 13:11-22:51 271, 8 0.052 282 125 8
2009 Jan 22 13:21-22:40 13:42-23:02 276, 5 0.061 238 64 4 CANCELLED
2009 Jan 23 13:39-22:44 14:04-23:10 279, 3 0.071 204 35 3
Goldstone SNRs assume Ptx = 200 kW
Arecibo SNRs
UTC LST # max
start date window window RA, dec dist runs SNR SNR/run
-----------------------------------------------------------------------------
2009 Jan 11 05:04-07:51 08:00-10:48 141, 19 0.075 58 690 94
2009 Jan 12 05:14-08:02 08:14-11:03 144, 21 0.066 67 1200 150
2009 Jan 13 05:30-08:17 08:34-11:22 149, 22 0.056 76 2200 270
2009 Jan 14 05:56-08:40 09:04-11:49 157, 25 0.047 86 4400 490
2009 Jan 15 06:39-09:16 09:51-12:29 167, 28 0.039 95 8800 950
2009 Jan 16 07:47-10:14 11:04-13:31 184, 30 0.033 100 17000 1800
2009 Jan 17 09:16-11:46 12:37-15:07 208, 30 0.029 110 25000 2600
2009 Jan 18 10:40-13:28 14:05-16:53 232, 25 0.030 122 24000 2300
2009 Jan 19 11:46-14:38 15:15-18:07 250, 19 0.035 112 14000 1400
2009 Jan 20 12:34-15:15 16:07-18:49 262, 13 0.042 92 6700 730
2009 Jan 21 13:10-15:34 16:47-19:12 270, 9 0.050 71 3100 380
2009 Jan 22 13:36-15:42 17:17-19:23 275, 6 0.060 54 1500 210
2009 Jan 23 13:57-15:44 17:42-19:29 279, 4 0.069 40 710 130
Arecibo SNRs assume Ptx = 700 kW.
1998 CS1 Goldstone Schedule
UT UT PST AST Duration Round-trip
DOY Date TX Window TX Window TX Window hh:mm time (sec) SNR/Run
--- ---- --------- --------- --------- --------- -------
012 Jan 12 0555-0810 2155-0010 Jan 11-12 0155-0410 2:15 65.4 4 CANCELLED
013 Jan 13 0600-1040 2200-0240 Jan 12-13 0200-0640 4:40 55.3 7
014 Jan 14 0520-1020 2120-0220 Jan 13-14 0120-0620 5:00 47.0 12
017 Jan 17 0800-1320 0000-0520 Jan 17 0400-0920 5:20 29.3 59
018 Jan 18 1730-1930 0930-1130 Jan 18 1330-1530 2:00 31.1 50
022 Jan 22 1325-1530 0525-0730 Jan 22 0925-1130 2:05 59.5 4 CANCELLED
Arecibo Schedule
014 Jan 14 0556-0840 2156-0040 Jan 13-14 0156-0440 Jan 14 2:44 47.0 490
015 Jan 15 0639-0916 2239-0116 Jan 14-15 0239-0516 Jan 15 2:37 38.9 950
016 Jan 16 0747-1014 2347-0214 Jan 15-16 0347-0614 Jan 16 2:27 32.6 1800
017 Jan 17 0916-1146 0116-0346 Jan 17 0516-0746 Jan 17 2:30 29.3 2600
018 Jan 18 1040-1328 0240-0528 Jan 18 0640-0928 Jan 18 2:48 30.2 2300
019 Jan 19 1146-1438 0346-0638 Jan 19 0746-1038 Jan 19 2:52 34.9 1400
020 Jan 20 1234-1515 0434-0715 Jan 20 0834-1115 Jan 20 2:41 42.0 730
021 Jan 21 1310-1534 0510-0734 Jan 21 0910-1134 Jan 21 2:24 50.4 380
From Horizons, 2008 December 11: JPL solution 37, #obs = 177 (1998-2008) Date__(UT)__HR:MN R.A._(J2000.0)_DEC. delta POS_3sigma DOP_S-sig DOP_X-sig RT_delay-sig 2009-Jan-12 00:00 * 143.27034 20.15189 0.068279175261513 6.69731860 0.64 2.30 0.000905 2009-Jan-13 00:00 * 147.74945 21.86838 0.058701044615426 7.92405249 0.64 2.28 0.000848 2009-Jan-14 00:00 * 154.06038 24.02981 0.049644668916033 9.53068026 0.62 2.21 0.000785 2009-Jan-15 00:00 * 163.33422 26.63639 0.041429387027008 11.5576555 0.58 2.06 0.000751 2009-Jan-16 00:00 * 177.29405 29.27369 0.034635484375694 13.7223150 0.50 1.77 0.000849 2009-Jan-17 00:00 * 197.30915 30.41990 0.030216952903686 14.8649673 0.39 1.39 0.001169 2009-Jan-18 00:00 * 220.84720 27.83852 0.029256653546495 13.4912598 0.37 1.31 0.001589 2009-Jan-19 00:00 * 241.34089 22.02008 0.032061255562888 10.5908278 0.50 1.77 0.001887 2009-Jan-20 00:00 * 255.78142 15.92524 0.037803183267068 8.27484315 0.63 2.26 0.002015 2009-Jan-21 00:00 * 265.37787 11.07018 0.045387223413233 6.82120919 0.73 2.61 0.002049 2009-Jan-22 00:00 * 271.88957 7.48871 0.054053319915682 5.84313694 0.80 2.86 0.002051 - - - - - - - - - - From Jon Giorgini, 2009 January 5: With 201 opt. measurements (1998-Feb-9 to 2009-Jan-2), 136849 (1998 CS1) solution #44 was computed. Formal 3-sigma S/X-band uncertainties are shown below: Date__(UT)__HR:MN POS_3sigma DOP_S-sig DOP_X-sig RT_delay-sig 2009-Jan-13 00:00 3.54785407 0.26 0.93 0.000921 2009-Jan-14 00:00 4.47596854 0.26 0.92 0.000855 2009-Jan-15 00:00 5.79165812 0.26 0.91 0.000752 2009-Jan-16 00:00 7.49467643 0.27 0.95 0.000602 2009-Jan-17 00:00 9.01702423 0.31 1.10 0.000481 2009-Jan-18 00:00 9.03379603 0.38 1.35 0.000605 2009-Jan-19 00:00 7.34645735 0.44 1.59 0.000859 2009-Jan-20 00:00 5.40472644 0.48 1.73 0.001048 2009-Jan-21 00:00 3.99930337 0.51 1.81 0.001160 2009-Jan-22 00:00 3.09784847 0.52 1.87 0.001226 - - - - - - - - - - From Jon Giorgini, 2009 January 13: The solution #48 Marina generated, using one additional DSS-14 delay measurement, is in place for Arecibo. 3-sigma formal uncertainties: Date__(UT)__HR:MN POS_3sigma DOP_S-sig DOP_X-sig RT_delay-sig 2009-Jan-13 00:00 2.92393477 0.26 0.93 0.000028 2009-Jan-14 00:00 3.46844495 0.26 0.92 0.000043 2009-Jan-15 00:00 4.12626577 0.25 0.90 0.000133 2009-Jan-16 00:00 4.76907787 0.24 0.86 0.000264 2009-Jan-17 00:00 4.99196132 0.23 0.82 0.000427 2009-Jan-18 00:00 4.41788524 0.23 0.83 0.000575 2009-Jan-19 00:00 3.54996399 0.25 0.89 0.000653 2009-Jan-20 00:00 2.95615606 0.27 0.96 0.000668 2009-Jan-21 00:00 2.56612574 0.29 1.02 0.000656 2009-Jan-22 00:00 2.26198076 0.30 1.07 0.000638
We will start the January 14 track with solution 48.
Here's the initial set up for Jan. 14:
TX polarization RCP
RCV polarization LCP & RCP
Frequency hops: 2 <-- Note the number of hops
Dwell 20 seconds
Bandwidth: 4000 Hz
Sampling interval: 2500 x 0.1 usec
VME FFT for PSD files: 1024 for 3.91-Hz resolution <-- Note the short FFT
Possible ranging setups:
---------------------------------------------------------------------------
127 x 64 10-usec single sample
baud 10 usec
code 127
gates 127
PRP 1270 usec
FFT 64
CLT VME ?
PFS ?
ncoh 1
bandwidth 787.4 Hz
resolution 12.3 Hz
TXOFF +100 Hz -> echo will be centered at +8 bins or in bin 32 + 8 = 40
---------------------------------------------------------------------------
127 x 64 11-usec single sample
baud 11 usec
code 127
gates 127
PRP 1397 usec
FFT 64
CLT VME ?
PFS ?
ncoh 1
bandwidth 715.8 Hz
resolution 11.2 Hz
TXOFF +100 Hz --> echo will be centered at +9 bins or in bin 32 + 9 = 41
-------------------------------------------------------------------------
127 x 64 7-usec single sample
baud 7 usec
code 127
gates 127
PRP 889
FFT 64
CLT VME ?
PFS ?
ncoh 1
bandwidth 1124.9 Hz
resolution 17.6 Hz
TXOFF +60 -> echo would be centered at +3.4 bins w/perfect ephemeris
-------------------------------------------------------------------------
127 x 64 1-usec single sample
baud 1 usec
code 127
gates 127
PRP 127
FFT 64
CLT 4
ncoh 15
bandwidth 525 Hz
resolution 8.2 Hz
TXOFF +100 -> echo would be centered at +12.2 bins or in bin 32 + 12.2 = 44
-------------------------------------------------------------------------------
0.125-usec ranging
setup JX1XS001 revised
baud 0.125 usec
code 127
gates 127
FFT 64
ncoh 984
bandwidth 64.016384 Hz
resolution 1.000256 Hz
TXOFF +15 Hz to put echo at 32 + 15 = bin 47
PFS CLT gate ?
VME CLT gate ?
_____________________________________________________________________
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/a136849/PRDX.OUT.s44
/PUNCH.OUT.s44
/EPH.OUT.s44
POINTING
TX Offsets
Date (UTC) DOY hhmmss RA Dec Macro LHA Dec RTT OSOD
2009 01 13 013 060000 149.2734 22.3362 A 56.2 44
2009 01 13 070000 149.5085 22.4247 A 55.8
2009 01 13 080000 149.7452 22.5134 A 55.4
2009 01 13 090000 149.9840 22.6022 A -3.7 1.4 55.1
2009 01 13 100000 150.2255 22.6910 A 54.7
2009 01 13 110000 150.4704 22.7798 A 54.3
2009 01 13 120000 150.7196 22.8684 A 53.9
2009 01 14 014 050000 155.8622 24.5088 A 47.7 44
2009 01 14 060000 156.2040 24.6177 A 47.4
2009 01 14 070000 156.5485 24.7271 A 47.0
2009 01 14 080000 156.8963 24.8366 A -4.5 1.4 46.6
2009 01 14 090000 157.2479 24.9461 A 46.3
2009 01 14 100000 157.6041 25.0552 A 45.9
2009 01 14 110000 157.9657 25.1639 A 45.6
2009 01 17 017 080000 205.2868 30.0239 A 29.4 44
2009 01 17 090000 206.2726 29.9508 A 29.3
2009 01 17 100000 207.2564 29.8693 A 29.3
2009 01 17 110000 208.2379 29.7790 A -8.0 -0.8 29.2
2009 01 17 120000 209.2174 29.6794 A 29.1
2009 01 17 130000 210.1952 29.5702 A 29.1
2009 01 17 140000 211.1717 29.4514 A 29.1
2009 01 18 018 160000 235.3094 24.1392 A 30.6 44
2009 01 18 170000 236.1036 23.8779 A 30.8
2009 01 18 180000 236.8886 23.6134 A -6.7 -2.2 30.9
2009 01 18 190000 237.6652 23.3463 A 31.1
2009 01 18 200000 238.4341 23.0771 A 31.3
2009 01 22 022 130000 274.7444 5.9660 A 58.9 44
2009 01 22 140000 274.9277 5.8595 A 59.3
2009 01 22 150000 275.1066 5.7543 A -2.9 -1.8 59.7
2009 01 22 160000 275.2816 5.6501 A 60.1
2009 01 22 170000 275.4532 5.5470 A 60.5
Transmit offsets are given in millidegrees.
PRDX.OUT.s44
TRANSMITTER: STATION #14, RECEIVER: STATION #14
RECEIVER U.T. RANGE DOPPLER LHA DEC RA EL
2009 JAN 13 06:00 56.2265291644 929422.565 296.6929 22.3362 149.273 33.978
2009 JAN 13 06:10 56.1614103356 928629.059 299.1606 22.3509 149.312 35.990
2009 JAN 13 06:20 56.0963482907 927802.466 301.6283 22.3657 149.352 38.006
2009 JAN 13 06:30 56.0313453208 926943.594 304.0960 22.3804 149.391 40.023
2009 JAN 13 06:40 55.9664036583 926053.308 306.5637 22.3952 149.430 42.041
2009 JAN 13 06:50 55.9015254732 925132.531 309.0313 22.4099 149.469 44.058
2009 JAN 13 07:00 55.8367128689 924182.237 311.4988 22.4247 149.508 46.073
2009 JAN 13 07:10 55.7719678784 923203.455 313.9663 22.4394 149.548 48.085
2009 JAN 13 07:20 55.7072924614 922197.263 316.4338 22.4542 149.587 50.091
2009 JAN 13 07:30 55.6426884997 921164.787 318.9012 22.4690 149.627 52.090
2009 JAN 13 07:40 55.5781577948 920107.198 321.3686 22.4838 149.666 54.080
2009 JAN 13 07:50 55.5137020648 919025.713 323.8359 22.4986 149.706 56.058
2009 JAN 13 08:00 55.4493229408 917921.590 326.3032 22.5134 149.745 58.020
2009 JAN 13 08:10 55.3850219641 916796.124 328.7704 22.5282 149.785 59.963
2009 JAN 13 08:20 55.3208005844 915650.649 331.2376 22.5430 149.825 61.881
2009 JAN 13 08:30 55.2566601564 914486.533 333.7046 22.5578 149.864 63.769
2009 JAN 13 08:40 55.1926019378 913305.175 336.1717 22.5726 149.904 65.617
2009 JAN 13 08:50 55.1286270874 912108.002 338.6386 22.5874 149.944 67.416
2009 JAN 13 09:00 55.0647366627 910896.470 341.1055 22.6022 149.984 69.151
2009 JAN 13 09:10 55.0009316187 909672.056 343.5723 22.6170 150.024 70.806
2009 JAN 13 09:20 54.9372128059 908436.260 346.0390 22.6318 150.064 72.355
2009 JAN 13 09:30 54.8735809690 907190.596 348.5056 22.6466 150.104 73.770
2009 JAN 13 09:40 54.8100367460 905936.598 350.9722 22.6614 150.145 75.010
2009 JAN 13 09:50 54.7465806672 904675.810 353.4387 22.6762 150.185 76.029
2009 JAN 13 10:00 54.6832131540 903409.784 355.9050 22.6910 150.225 76.776
2009 JAN 13 10:10 54.6199345189 902140.081 358.3713 22.7058 150.266 77.201
2009 JAN 13 10:20 54.5567449650 900868.263 0.8375 22.7206 150.307 77.274
2009 JAN 13 10:30 54.4936445856 899595.895 3.3036 22.7354 150.347 76.988
2009 JAN 13 10:40 54.4306333645 898324.538 5.7695 22.7502 150.388 76.366
1998 CS1 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/1998CS1/html/1998CS1_planning.html
Asteroid Radar Astronomy