2003 YE45 Goldstone Radar Observations Planning
2003 YE45 was discovered the Catalina Sky Survey (University of Arizona) on December 21, 2003. It will approach within 0.0424 AU (16.5 lunar distances) on July 13 and it should be a strong radar target. With an absolute magnitude of 17.5, 2003 YE45 has a diameter that is probably within a factor of two of 1.1 km. Spectroscopy reported by Michael Hicks (JPL) indicates that it has an S-class composition (possibly analogous to the ordinary chondrite meteorites). Otherwise, we know nothing about its physical properties. Given recent experience, there's a a ~1/6 chance that it's a binary system. Goldstone observations are scheduled on four tracks during July 16-19. Arecibo observations are scheduled on July 6 and 7 (on the same dates as 2008 BT18), so by the time we start the YE45 observations at Goldstone, we should have a much better understanding of this object's physical properties. 2003 YE45 will brighten to about 15th magnitude in July when it will be a good target for lightcurves and spectroscopy. Due to its diameter and the proximity of its orbit to Earth, this asteroid has been classified as a "Potentially Hazardous Asteroid" by the Minor Planet Center.
Orbital and Physical Characteristics orbit type Apollo semimajor axis 1.235 AU eccentricity 0.280 inclination 19.0° perihelion distance 0.889 AU aphelion distance 1.581 AU absolute magnitude (H) 17.5 diameter 1.1 km +- a factor of two rotation period unknown pole direction unknown lightcurve amplitude unknown spectral class S (M. D. Hicks, personal communication) Last update: 2008 June 26
M.P.E.C. 2003-Y48 Issued 2003 Dec. 23, 00:15 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.
Supported in part by the Steven and Michele Kirsch Foundation
Prepared using the Tamkin Foundation Computer Network
MPC@CFA.HARVARD.EDU
URL http://cfa-www.harvard.edu/iau/mpc.html ISSN 1523-6714
2003 YE45
Observations:
K03Y45E* C2003 12 21.44012 10 48 29.76 -00 14 48.7 19.0 V EY048703
K03Y45E C2003 12 21.45381 10 48 31.18 -00 15 23.3 18.9 V EY048703
K03Y45E C2003 12 21.46743 10 48 32.63 -00 15 58.7 18.5 V EY048703
K03Y45E C2003 12 21.48110 10 48 33.94 -00 16 35.9 19.4 V EY048703
K03Y45E C2003 12 22.11419 10 49 42.29 -00 44 44.0 EY048J95
K03Y45E C2003 12 22.12002 10 49 42.93 -00 45 00.7 EY048J95
K03Y45E C2003 12 22.12595 10 49 43.55 -00 45 15.4 18.6 R EY048J95
K03Y45E C2003 12 22.28786 10 50 01.16 -00 52 28.2 17.4 R EY048785
K03Y45E C2003 12 22.30747 10 50 03.24 -00 53 20.4 17.8 R EY048785
K03Y45E C2003 12 22.30968 10 50 03.84 -00 53 24.3 18.6 R EY048854
K03Y45E C2003 12 22.31629 10 50 04.48 -00 53 43.5 18.5 R EY048854
K03Y45E C2003 12 22.39021 10 50 12.20 -00 57 01.0 18.4 EY048704
K03Y45E C2003 12 22.40292 10 50 13.60 -00 57 35.4 18.5 EY048704
K03Y45E C2003 12 22.41533 10 50 14.90 -00 58 09.0 18.8 EY048704
K03Y45E C2003 12 22.42771 10 50 16.11 -00 58 42.8 18.2 EY048704
K03Y45E C2003 12 22.44066 10 50 17.46 -00 59 17.2 18.8 EY048704
Observer details:
703 Catalina Sky Survey. Observers S. Larson, E. Beshore, E. Christensen,
R. Hill, S. Kolar, D. McLean. 0.68-m f/1.8 Schmidt + CCD.
704 Lincoln Laboratory ETS, New Mexico. Observers M. Blythe, F. Shelly,
M. Bezpalko, R. Huber, L. Manguso, D. Torres, R. Kracke, M. McCleary,
H. Stange, A. Milner. Measurers J. Stuart, R. Sayer, J. Evans, J. Kommers.
1.0-m f/2.15 reflector + CCD.
785 Fitz-Randolph Observatory, Princeton. Observer J. Maffei. 0.91-m f/13.6
Cassegrain + CCD.
854 Sabino Canyon Observatory, Tucson. Observer J. E. McGaha. 0.356-m f/10.0
Schmidt-Cassegrain + CCD.
J95 Great Shefford. Observer P. Birtwhistle. 0.30-m f/6.3 Schmidt-Cassegrain
+ CCD.
Orbital elements:
2003 YE45
Epoch 2003 Dec. 7.0 TT = JDT 2452980.5 MPC
M 278.93205 (2000.0) P Q
n 0.64119895 Peri. 291.94129 -0.72888140 +0.60747482
a 1.3319079 Node 286.92517 -0.44006249 -0.76901154
e 0.2539565 Incl. 19.27237 -0.52447774 -0.19898644
P 1.54 H 17.3 G 0.15
From 16 observations 2003 Dec. 21-22.
Ephemeris:
2003 YE45 a,e,i = 1.33, 0.25, 19 q = 0.9937
Date TT R. A. (2000) Decl. Delta r Elong. Phase V
2003 12 17 10 40.45 +02 52.8 0.684 1.327 104.0 46.0 18.8
2003 12 27 10 58.41 -04 33.1 0.595 1.289 106.9 46.9 18.5
2004 01 06 11 16.11 -13 32.6 0.518 1.250 108.7 48.2 18.2
2004 01 16 11 34.28 -24 15.1 0.457 1.211 108.8 50.3 17.9
2004 01 26 11 54.17 -36 28.1 0.414 1.172 106.7 53.6 17.7
2004 02 05 12 18.69 -49 26.0 0.389 1.135 102.5 58.0 17.6
2004 02 15 12 55.01 -61 57.9 0.381 1.100 96.9 63.0 17.6
2004 02 25 14 03.7 -72 37.4 0.385 1.069 91.1 67.8 17.8
2004 03 06 16 38.3 -78 50.9 0.396 1.041 85.9 71.8 17.9
2004 03 16 19 48.8 -77 02.8 0.410 1.019 81.7 74.9 18.0
2004 03 26 21 21.3 -70 43.6 0.423 1.004 78.6 77.0 18.1
2004 04 05 22 03.71 -63 27.1 0.433 0.995 76.8 78.2 18.2
2004 04 15 22 28.06 -55 57.0 0.438 0.994 76.2 78.5 18.2
2004 04 25 22 44.58 -48 19.0 0.440 1.001 76.6 78.0 18.2
2004 05 05 22 56.93 -40 31.0 0.437 1.014 78.2 76.8 18.2
2004 05 15 23 06.65 -32 31.0 0.431 1.035 80.9 74.8 18.2
2004 05 25 23 14.02 -24 19.4 0.422 1.060 84.7 72.0 18.1
2004 06 04 23 18.84 -15 56.4 0.411 1.091 89.4 68.4 18.0
2004 06 14 23 20.60 -07 24.6 0.400 1.125 95.2 64.1 17.8
2004 06 24 23 18.28 +01 08.6 0.391 1.161 101.9 58.9 17.7
2004 07 04 23 10.79 +09 29.3 0.384 1.200 109.2 53.1 17.6
2004 07 14 22 57.06 +17 13.2 0.384 1.239 117.0 47.0 17.5
2004 07 24 22 36.57 +23 44.0 0.391 1.278 124.3 41.0 17.4
2004 08 03 22 10.70 +28 24.4 0.408 1.316 130.5 35.9 17.4
2004 08 13 21 42.93 +30 52.7 0.435 1.354 134.4 32.3 17.5
2004 08 23 21 17.94 +31 14.7 0.474 1.390 135.6 30.6 17.7
2004 09 02 20 59.37 +30 03.2 0.524 1.425 134.3 30.4 18.0
2004 09 12 20 48.42 +27 57.7 0.584 1.458 131.1 31.3 18.3
2004 09 22 20 44.69 +25 30.6 0.652 1.489 126.9 32.6 18.6
2004 10 02 20 47.03 +23 04.9 0.728 1.518 122.0 34.0 18.9
2004 10 12 20 54.11 +20 52.9 0.811 1.545 116.9 35.2 19.2
2004 10 22 21 04.92 +19 01.3 0.899 1.569 111.8 36.1 19.5
2004 11 01 21 18.56 +17 33.2 0.991 1.591 106.6 36.7 19.8
2004 11 11 21 34.37 +16 28.7 1.087 1.610 101.5 37.1 20.0
2004 11 21 21 51.89 +15 47.2 1.186 1.626 96.4 37.1 20.2
2004 12 01 22 10.70 +15 27.2 1.286 1.640 91.5 36.9 20.4
2004 12 11 22 30.53 +15 26.4 1.386 1.652 86.6 36.5 20.6
2004 12 21 22 51.21 +15 42.8 1.486 1.660 81.7 35.9 20.7
2004 12 31 23 12.55 +16 13.8 1.585 1.666 77.0 35.1 20.9
2005 01 10 23 34.49 +16 56.9 1.681 1.669 72.3 34.1 21.0
2005 01 20 23 56.97 +17 49.7 1.774 1.670 67.7 33.0 21.0
2005 01 30 00 19.96 +18 49.6 1.863 1.668 63.1 31.8 21.1
Timothy B. Spahr (C) Copyright 2003 MPC M.P.E.C. 2003-Y48
Target Name: 2003 YE45
HMag: 17.5
Diameter: 1.1 (an educated guess assuming H = 17.5 and an S-class optical albedo)
Period: 4 (a standard guess)
Scheduled tracks are highlighted in bold.
Goldstone: G = 0.94 K/Jy, Tsys = 18.0 K, P = 450 kW, elev >= 20.00 deg, unhopped
UTC # max
start date window RA dec dist runs SNR SNR/run
-----------------------------------------------------------------
2008 Jul 05 01:35-21:36 130 -3 0.071 187 130 11
2008 Jul 06 01:48-21:40 132 0 0.065 210 190 14
2008 Jul 07 02:04-21:46 135 4 0.060 238 280 20
2008 Jul 08 02:23-21:54 138 9 0.055 269 410 27
2008 Jul 09 02:46-22:05 141 14 0.050 304 580 36
2008 Jul 10 03:14-22:18 145 21 0.047 342 790 46
2008 Jul 11 03:47-22:36 151 28 0.044 381 1000 56
2008 Jul 12 04:28-23:00 157 36 0.043 416 1200 64
2008 Jul 13 05:18-23:31 166 43 0.043 445 1300 65
2008 Jul 14 06:17-00:11 176 50 0.044 463 1200 60
2008 Jul 15 07:24-01:00 189 55 0.046 467 1000 50
2008 Jul 16 08:35-01:52 202 58 0.049 458 770 39
2008 Jul 17 09:38-02:41 216 60 0.053 435 560 29
2008 Jul 18 10:28-03:22 228 60 0.058 404 400 22
2008 Jul 19 11:03-03:54 237 59 0.064 371 280 16
2008 Jul 20 11:27-04:19 245 58 0.069 339 200 12
2008 Jul 21 11:43-04:37 251 57 0.075 311 140 9
Arecibo: G = 10.00 K/Jy, Tsys = 25.0 K, P = 700 kW, elev >= 70.31 deg, unhopped
UTC # max
start date window RA dec dist runs SNR SNR/run
----------------------------------------------------------------
2008 Jul 06 17:47-18:49 133 0 0.065 25 1000 220
2008 Jul 07 17:27-19:20 135 4 0.060 49 2500 390
2008 Jul 08 17:19-19:43 138 9 0.055 67 4100 530
2008 Jul 09 17:20-20:02 141 15 0.050 82 6200 710
2008 Jul 10 17:30-20:18 146 21 0.047 89 8400 920
2008 Jul 11 17:57-20:25 151 29 0.044 83 9700 1100
2008 Jul 12 18:59-20:08 158 37 0.043 39 7165 950
Goldstone Schedule
UT UT PDT Duration Round-trip
DOY Date TX Window TX Window hh:mm time (sec)
--- ---- --------- --------- ------- ---------
198 Jul 16 0710-0835 0010-0135 Jul 16 01:25 48
199 Jul 17 0445-0935 2145-0235 Jul 16-17 04:50 51
200 Jul 18 0630-1025 2330-0325 Jul 17-18 03:55 56
201 Jul 19 0630-1120 2330-0420 Jul 18-19 05:10 61
On DOY 201, we also have transmit authorization to observe 2005 RC34.
We will decide how to partition the time later.
Arecibo Schedule
188 Jul 06 1747-1849 1047-1149 Jul 06 01:02 65
189 Jul 07 1727-1920 1027-1220 Jul 07 01:53 60
From Jon Giorgini, 2008 June 24: With 290 optical measurements (1989-Sep-12 to 2008-Mar-08), 90403 (2003 YE45) solution #63 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 2008-Jul-06 00:00 11.1030793 1.53 5.48 0.003472 2008-Jul-07 00:00 12.1516443 1.57 5.62 0.003445 2008-Jul-08 00:00 13.3800033 1.60 5.73 0.003398 2008-Jul-09 00:00 14.8185951 1.62 5.81 0.003318 2008-Jul-10 00:00 16.4775349 1.63 5.82 0.003189 2008-Jul-11 00:00 18.3046791 1.60 5.71 0.002991 2008-Jul-12 00:00 20.1271726 1.53 5.46 0.002710 2008-Jul-13 00:00 21.6322463 1.41 5.04 0.002344 2008-Jul-14 00:00 22.4711167 1.25 4.48 0.001914 2008-Jul-15 00:00 22.4572028 1.07 3.82 0.001462 2008-Jul-16 00:00 21.6708031 0.89 3.17 0.001033 2008-Jul-17 00:00 20.3706821 0.72 2.58 0.000667 2008-Jul-18 00:00 18.8345951 0.59 2.11 0.000409 2008-Jul-19 00:00 17.2657801 0.50 1.79 0.000338 2008-Jul-20 00:00 15.7799670 0.45 1.62 0.000433 2008-Jul-21 00:00 14.4285507 0.44 1.57 0.000569 Additional optical measurement prior to the radar experiment is UNLIKELY (until ~July 10+) for this day-time object.
The rotation period, diameter, and pole direction of 2003 YE45 are unknown so we don't know what
bandwdith to expect. The setup below is a placeholder that we will update after Arecibo observations
on July 6-7.
Initial CW setup
----------------
TX polarization RCP
RCV polarization LCP & RCP
Frequency hops: 2
Dwell 20 seconds
Bandwidth: 4000 Hz
Sampling interval: 2500 x 0.1 usec
VME FFT for PSD files: 8192 for 0.49-Hz resolution
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 at Goldstone on aardvark:
/export/data3/ops/2003ye45/ PRDX.OUT.s??
/PUNCH.OUT.s??
/EPH.OUT.s??
POINTING
TX Offsets
Date (UTC) DOY hhmmss RA Dec Macro LHA Dec RTT OSOD
NOT AVAILABLE YET
Note: in this macro LHA and Dec are given in millidegrees.
PRDX.OUT.s??
TRANSMITTER: STATION #14, RECEIVER: STATION #14
RECEIVER U.T. RANGE DOPPLER LHA DEC RA EL
NOT AVAILABLE YET
2003 YE45 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@reason.jpl.nasa.gov
Pasadena, CA 91109-8099 | Plan: To live long and prosper
http://echo.jpl.nasa.gov/asteroids/2003YE45/2003YE45_planning.html
Asteroid Radar Astronomy