(11500) 1989 UR Planning
(11500) 1989 UR was discovered by J. Mueller and D. Mendenhall at Palomar on October 28, 1989. It will approach within 0.0710 AU (28 lunar distances) on November 24 when it will be a moderately strong radar target. Spectroscopy reported by Binzel et al. (2004) places 1989 UR in the S taxonomic class, so its composition is similar to that of many NEAs. 1989 UR has an unusually slow rotation period of about 3 days (Pravec et al., unpublished) and its 0.5 magnitude lightcurve amplitude reveals an elongated shape. Several other asteroids with such slow rotation periods are non-principal axis rotators, but we don't yet know if this is true for 1989 UR. The absolute magnitude of 18.4 suggests a diameter within a factor of two of 660 meters. Goldstone observations are scheduled on November 26 and 27. 2007 VD12 is observable during the tracks already scheduled for 1989 UR so we plan to observe both objects. The 2007 VD12 planning page is available here. This object will brighten to about 15th magnitude in November when it will be a good target for photometric and spectroscopic observations. Due to the proximity of its orbit to Earth and its diameter, 1989 UR has been classified as a "Potentially Hazardous Asteroid" by the Minor Planet Center.
Orbital and Physical Characteristics orbit type Apollo semimajor axis 1.080 AU eccentricity 0.356 inclination 10.3° perihelion distance 0.696 AU aphelion distance 1.464 AU absolute magnitude (H) 18.4 diameter 660 meters +- a factor of two rotation period 73 +- 0.5 hours (Pravec et al., unpublished) pole direction unknown lightcurve amplitude 0.5 mag (Pravec et al., unpublished) spectral class S (Binzel et al. 2004) Last update: 2007 December 3
Circular No. 4891
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM EASYLINK 62794505
MARSDEN or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN
1989 UR
J. Mueller and D. Mendenhall report their discovery of a
fast-moving asteroidal object, found in the course of the second
Palomar Sky Survey with the 1.2-m Oschin Schmidt telescope.
C. Brewer was an observer. The following positions are available:
1989 UT R.A. (1950) Decl. R
Oct. 28.20278 1 13 59.97 +28 23 16.3 18
28.25139 1 13 49.15 +28 21 25.1
29.23264 1 10 16.91 +27 41 12.9
29.24653 1 10 13.94 +27 40 40.5
Nov. 1.16667 0 59 31.93 +25 28 11.5
1.21875 0 59 20.2 +25 25 45.1
Preliminary orbital elements by B. G. Marsden, Center for
Astrophysics, from the above observations:
T = 1990 Feb. 11.702 ET Peri. = 289.905
e = 0.36509 Node = 233.769 1950.0
q = 0.68748 AU Incl. = 10.652
a = 1.08281 AU n = 0.874734 P = 1.13 years
1989 ET R.A. (1950) Decl. Delta r V
Nov. 2 0 56.43 +24 47.2 0.234 1.210 18.1
4 0 49.01 +23 02.2
6 0 41.64 +21 09.1 0.221 1.189 18.1
8 0 34.36 +19 08.7
10 0 27.24 +17 01.7 0.211 1.168 18.1
12 0 20.31 +14 49.2
14 0 13.63 +12 32.3 0.204 1.145 18.2
16 0 07.21 +10 12.1
18 0 01.08 + 7 49.8 0.200 1.123 18.3
.
.
.
1989 November 2 (4891) Daniel W. E. Green
Target Name: 1989 UR
HMag: 18.4
Diameter: 0.66 km (an educated guess assuming H = 18.4 and an S-class optical albedo)
Period: 73 (Pravec et al., unpublished)
------------GOLDSTONE---------- -------------ARECIBO-----------
Max Max
Date Run UTC Date Run UTC
Date RA Decl Delta Runs SNR SNR Window Runs SNR SNR Window
2007 11 8 95 28 0.150 115 13 1 5:30-16:36 25 260 57 6:30- 8:54
2007 11 9 96 27 0.143 119 16 2 5:30-16:36 26 320 67 6:30- 9:00
2007 11 10 98 26 0.137 122 19 2 5:35-16:36 28 400 79 6:30- 9:05
2007 11 11 100 25 0.130 126 23 2 5:42-16:36 30 490 95 6:30- 9:05
2007 11 12 101 23 0.123 130 29 3 5:47-16:36 31 600 110 6:30- 9:11
2007 11 13 103 22 0.117 165 39 3 6:00-16:36 41 840 140 6:35- 9:18
2007 11 14 105 20 0.111 172 48 4 6:05-16:36 42 1000 170 6:42- 9:24
2007 11 15 108 18 0.105 178 59 5 6:17-16:36 44 1300 200 6:42- 9:24
2007 11 16 110 16 0.099 184 73 6 6:30-16:36 47 1600 240 6:47- 9:30
2007 11 17 113 14 0.094 189 90 7 6:42-16:36 48 1900 300 7:00- 9:35
2007 11 18 115 11 0.089 194 110 9 6:54-16:36 48 2300 360 7:12- 9:35
2007 11 19 118 8 0.085 198 130 10 7:12-16:36 47 2700 430 7:24- 9:41
2007 11 20 122 5 0.081 200 160 12 7:30-16:30 42 2900 500 7:47- 9:35
2007 11 21 125 1 0.077 201 180 14 7:54-16:30 30 2400 480 8:18- 9:30
2007 11 22 129 -3 0.075 198 200 16 8:18-16:30 0 0 0 -
2007 11 23 133 -8 0.073 193 210 17 8:41-16:23 0 0 0 -
2007 11 24 137 -12 0.071 184 210 18 9:11-16:23 0 0 0 -
2007 11 25 142 -16 0.071 172 200 17 9:48-16:18 0 0 0 -
2007 11 26 147 -21 0.071 156 180 16 10:24-16:11 0 0 0 -
2007 11 27 152 -25 0.073 138 150 14 11:05-16:00 0 0 0 -
2007 11 28 157 -29 0.075 118 120 12 11:54-15:48 0 0 0 -
2007 11 29 162 -32 0.078 97 91 10 12:48-15:24 0 0 0 -
1989 UR Goldstone Schedule
UT UT PST Duration Round-trip
DOY Date TX Window TX Window hh:mm time (sec) SNR/Run
--- ---- --------- --------- ------- --------- -------
330 Nov 26 1130-1530 0330-0730 4:00 72 16
331 Nov 27 1130-1530 0330-0730 4:00 74 14
Note that the first track is late on the Sunday night after Thanksgiving.
This object cannot be observed at Arecibo due to maintenance on the platform.
From Jon Giorgini, 2007 November 1:
With 242 usable optical measurements spanning 1989-Oct-25 to 2007-Oct-23,
11500 (1989 UR) solution #33 was computed. Formal 3-sigma X-band uncertainties
are as shown below.
Date__(UT)__HR:MN POS_3sigma DOP_X-sig RT_delay-sig
arcsec Hz usec
2007-Nov-25 00:00 2.04845556 0.43 0.001018
2007-Nov-26 00:00 1.94365251 0.41 0.001050
2007-Nov-27 00:00 1.85348349 0.46 0.001072
2007-Nov-28 00:00 1.78480938 0.56 0.001086
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
From Horizons, 2007 November 7: JPL solution 37, #obs = 267 (1999-2007)
Date__(UT)__HR:MN R.A._(J2000.0) DEC. delta POS_3sigma DOP_X-sig RT_delay-sig
2007-Nov-25 00:00 141.87 -16.40 0.07105 1.195 0.40 0.000500
2007-Nov-26 00:00 146.61 -20.74 0.07151 1.160 0.40 0.000515
2007-Nov-27 00:00 151.51 -24.85 0.07278 1.126 0.43 0.000527
2007-Nov-28 00:00 156.50 -28.62 0.07483 1.095 0.48 0.000535
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
From Horizons, 2007 November 19: JPL solution 41, #obs = 289 (1999-2007)
2007-Nov-25 00:00 141.87 -16.41 0.07105 0.862 0.40 0.000305
2007-Nov-26 00:00 146.61 -20.75 0.07151 0.860 0.40 0.000311
2007-Nov-27 00:00 151.51 -24.85 0.07278 0.854 0.42 0.000316
2007-Nov-28 00:00 156.50 -28.62 0.07483 0.842 0.46 0.000319
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
From Jon Giorgini, 2007 November 25:
With 287 optical measurements spanning 1989-Oct-25 to 2007-Nov-16,
solution #43 formal 3-sigma X-band uncertainties are as shown below.
Date__(UT)__HR:MN POS_3sigma DOP_X-sig RT_delay-sig
2007-Nov-25 00:00 .885772832 0.40 0.000318
2007-Nov-26 00:00 .881564992 0.40 0.000325
2007-Nov-27 00:00 .872698364 0.42 0.000330
2007-Nov-28 00:00 .859877610 0.46 0.000334
Plans for the first track:
WE WILL START WITH SOLUTION 43
Due to the 73 hour rotation period, we are expecting a narrow bandwidth in the realm
of only 1 Hz. Consequently, our initial CW setup will have higher resolution
than usual in an attempt to resolve the echo in frequency.
Initial CW setup
----------------
TX polarization RCP
RCV polarization LCP & RCP
Frequency hops: 2
Dwell 30 seconds
Bandwidth: 4000 Hz
Sampling interval: 2500 x 0.1 usec
VME FFT for PSD files: 16384 for 0.244-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/home1/jongi/ops/a11500/PRDX.OUT.s43
/PUNCH.OUT.s43
/EPH.OUT.s43
and have been copied to:
http://echo.jpl.nasa.gov/asteroids/1989UR/PRDX.OUT.s43
http://echo.jpl.nasa.gov/asteroids/1989UR/PUNCH.OUT.s43
http://echo.jpl.nasa.gov/asteroids/1989UR/EPH.OUT.s43
POINTING
TX Offsets
Date (UTC) DOY hhmmss RA Dec Macro LHA Dec RTT OSOD
2007 11 26 330 100000 148.7618 -22.5443 A 71.8 43
2007 11 26 330 110000 148.9600 -22.7184 A 71.8
2007 11 26 330 120000 149.1573 -22.8914 A 71.9
2007 11 26 330 130000 149.3541 -23.0632 A -0.0039 -0.0034 71.9
2007 11 26 330 140000 149.5508 -23.2338 A 72.0
2007 11 26 330 150000 149.7481 -23.4032 A 72.0
2007 11 26 330 160000 149.9464 -23.5714 A 72.0
2007 11 27 331 110000 153.9122 -26.6831 A 73.4 33
2007 11 27 331 120000 154.1137 -26.8424 A 73.5
2007 11 27 331 130000 154.3146 -27.0002 A 73.6
2007 11 27 331 140000 154.5151 -27.1566 A -0.0041 -0.0032 73.7
2007 11 27 331 150000 154.7160 -27.3115 A 73.8
2007 11 27 331 160000 154.9175 -27.4650 A 73.9
2007 11 27 331 170000 155.1204 -27.6170 A 74.0
PRDX.OUT.s43
TRANSMITTER: STATION #14, RECEIVER: STATION #14
RECEIVER U.T. RANGE DOPPLER LHA DEC RA EL
2007 NOV 25 11:30 70.9717967022 -35646.117 335.4112 -18.5575 144.233 31.196
2007 NOV 25 11:40 70.9743433077 -37019.492 337.8863 -18.5879 144.264 32.058
2007 NOV 25 11:50 70.9769866724 -38406.684 340.3614 -18.6183 144.296 32.836
2007 NOV 25 12:00 70.9797277111 -39806.156 342.8365 -18.6486 144.328 33.528
2007 NOV 25 12:10 70.9825672231 -41216.349 345.3116 -18.6790 144.360 34.130
2007 NOV 25 12:20 70.9855059188 -42635.683 347.7867 -18.7093 144.391 34.639
2007 NOV 25 12:30 70.9885443689 -44062.563 350.2618 -18.7395 144.423 35.053
2007 NOV 25 12:40 70.9916830496 -45495.378 352.7370 -18.7698 144.455 35.368
2007 NOV 25 12:50 70.9949223238 -46932.509 355.2121 -18.8000 144.487 35.584
2007 NOV 25 13:00 70.9982624334 -48372.328 357.6872 -18.8302 144.518 35.700
2007 NOV 25 13:10 71.0017035132 -49813.201 0.1623 -18.8604 144.550 35.713
2007 NOV 25 13:20 71.0052455799 -51253.496 2.6374 -18.8905 144.582 35.626
2007 NOV 25 13:30 71.0088885357 -52691.579 5.1125 -18.9206 144.614 35.437
2007 NOV 25 13:40 71.0126321613 -54125.823 7.5876 -18.9507 144.645 35.149
2007 NOV 25 13:50 71.0164761379 -55554.607 10.0627 -18.9808 144.677 34.762
2007 NOV 25 14:00 71.0204200263 -56976.323 12.5377 -19.0108 144.709 34.279
2007 NOV 25 14:10 71.0244632749 -58389.374 15.0127 -19.0409 144.741 33.703
2007 NOV 25 14:20 71.0286052137 -59792.181 17.4878 -19.0709 144.773 33.035
2007 NOV 25 14:30 71.0328450771 -61183.184 19.9627 -19.1008 144.804 32.280
2007 NOV 25 14:40 71.0371819835 -62560.848 22.4377 -19.1308 144.836 31.441
2007 NOV 25 14:50 71.0416149449 -63923.659 24.9126 -19.1607 144.868 30.521
2007 NOV 25 15:00 71.0461428605 -65270.136 27.3875 -19.1906 144.900 29.524
2007 NOV 25 15:10 71.0507645488 -66598.826 29.8624 -19.2204 144.932 28.454
2007 NOV 25 15:20 71.0554786985 -67908.310 32.3372 -19.2503 144.964 27.315
2007 NOV 25 15:30 71.0602839218 -69197.207 34.8120 -19.2801 144.996 26.111
(11500) 1989 UR GOLDSTONE MASTERLOG
==============================================================================
Receive TX
Setup hops dwell code ncoh FFT runs start -stop OSOD offset Poln Notes
------------------------------------------------------------------------------
PSD2007330168.1989UR, VOLT2007330169.1989UR
CW, 4 kHz 2 30 16384 10 121501-123806 43 None RCP
VME only; PFS data are corrupted.
Radar Astrometry
----------------
2007 11 26 12:20:00 P -121825.1D0 0.5 8560.D6 -14 -14 Benner,L.A.M
Correction of +1 Hz to solution 43 from 10 CW runs with 0.24 Hz
resolution. Bandwidth is about 1.5 Hz.
==============================================================================
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/1989UR/html/1989UR_planning.html
Asteroid Radar Astronomy