(326290) 1998 HE3 Goldstone Radar Observations Planning
Near-Earth asteroid (326290) 1998 HE3 was discovered by R. A. Tucker at Goodricke-Pigott Observatory, Tucson on April 21, 1998. Not much is known about this object except that its absolute magnitude of 21.7 suggests a diameter of ~140 m (within a factor of two). 1998 HE3 belongs to the Aten class of asteroids and it makes regular 10-30 lunar distance approaches to both Venus and Earth. On May 10, 2012, it will encounter Earth encounter at 12.4 lunar distances, the closest approach until 2059. This asteroid will be a relatively weak radar target (most likely CW-only) at Goldstone and a strong imaging target at Arecibo. 1998 HE3 will brighten to 16th magnitude in early May and it would be very helpful if someone could estimate the rotation period and confirm the spectral class. 1998 HE3 has been classified as a "Potentially Hazardous Asteroid" by the Minor Planet Center.
Orbital and Physical Characteristics orbit type Aten semimajor axis 0.878 AU eccentricity 0.44 inclination 3.38 deg perihelion distance 0.491 AU aphelion distance 1.265 AU absolute magnitude (H) 21.7 diameter ~80 m (M. Nolan, Arecibo private comm.) rotation period ~4 min (Y. Krugly, private comm.) pole direction unknown lightcurve amplitude unknown spectral class R Fevig and Fink (2007) Last update: 2012 May 10
M.P.E.C. 1998-H17 Issued 1998 Apr. 23, 14:16 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 HE3
Observations:
J98H03E* C1998 04 21.27552 15 29 58.09 -09 23 43.1 18.3 R 683
J98H03E C1998 04 21.29794 15 29 52.84 -09 23 15.3 18.2 R 683
J98H03E C1998 04 21.32066 15 29 47.61 -09 22 47.2 18.5 R 683
J98H03E C1998 04 21.43469 15 29 20.79 -09 20 25.4 683
J98H03E C1998 04 21.45056 15 29 17.10 -09 20 05.1 18.4 R 683
J98H03E C1998 04 21.46697 15 29 13.27 -09 19 43.8 18.2 R 683
J98H03E C1998 04 21.88573 15 27 45.23 -09 10 53.1 18.0 V 104
J98H03E C1998 04 21.88981 15 27 44.31 -09 10 48.0 104
J98H03E C1998 04 21.89347 15 27 43.52 -09 10 43.8 104
J98H03E C1998 04 21.97008 15 27 24.69 -09 09 08.3 18.5 V 046
J98H03E C1998 04 21.98032 15 27 22.15 -09 08 55.4 046
J98H03E C1998 04 21.98677 15 27 20.52 -09 08 46.4 046
J98H03E C1998 04 21.98788 15 27 20.32 -09 08 44.8 046
J98H03E C1998 04 21.98902 15 27 20.08 -09 08 43.2 046
J98H03E C1998 04 22.00111 15 27 17.01 -09 08 27.7 557
J98H03E C1998 04 22.00273 15 27 16.66 -09 08 26.5 18.6 V 557
J98H03E C1998 04 22.01120 15 27 14.68 -09 08 15.4 557
J98H03E IC1998 04 22.01470 15 27 13.65 -09 08 10.2 557
J98H03E C1998 04 22.39887 15 25 43.21 -08 59 18.3 18.1 R 683
J98H03E C1998 04 22.40583 15 25 41.33 -08 59 09.0 18.3 R 683
J98H03E C1998 04 22.42392 15 25 36.63 -08 58 43.5 18.8 R 683
J98H03E C1998 04 22.46693 15 25 25.52 -08 57 43.2 683
J98H03E C1998 04 22.47432 15 25 23.51 -08 57 32.6 683
J98H03E C1998 04 22.97043 15 23 23.95 -08 46 02.0 557
J98H03E C1998 04 22.97206 15 23 23.57 -08 45 59.2 18.6 V 557
J98H03E C1998 04 23.05709 15 23 00.12 -08 43 54.0 118
J98H03E C1998 04 23.05933 15 22 59.54 -08 43 51.0 118
J98H03E C1998 04 23.06380 15 22 58.32 -08 43 44.4 118
J98H03E C1998 04 23.07516 15 22 55.36 -08 43 27.9 046
J98H03E C1998 04 23.07635 15 22 54.99 -08 43 26.3 046
J98H03E C1998 04 23.07774 15 22 54.56 -08 43 23.7 046
J98H03E C1998 04 23.28332 15 22 04.13 -08 38 04.4 18.2 R 683
J98H03E C1998 04 23.28666 15 22 03.13 -08 38 00.1 18.1 R 683
J98H03E C1998 04 23.29326 15 22 01.30 -08 37 49.4 17.9 R 683
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.
118 Modra. Observers L. Kornos, P. Koleny. 0.6-m f/5.5 reflector + CCD.
557 Ondrejov. Observer P. Pravec. 0.65-m f/3.6 reflector + CCD.
683 Goodricke-Pigott Observatory, Tucson. Observer R. A. Tucker. 0.36-m
Schmidt-Cassegrain + CCD.
Orbital elements:
1998 HE3 PHA 0.003
Epoch 1998 Apr. 17.0 TT = JDT 2450920.5 Williams
M 241.31907 (2000.0) P Q
n 1.19707608 Peri. 309.00833 +0.99760584 -0.04959563
a 0.8784591 Node 53.88642 +0.06552303 +0.90076784
e 0.4426665 Incl. 3.42028 -0.02212059 +0.43145982
P 0.82 H 21.5 G 0.15
From 34 observations 1998 Apr. 21-23.
Ephemeris:
1998 HE3 a,e,i = 0.88, 0.44, 3 q = 0.4896
Date TT R. A. (2000) Decl. Delta r Elong. Phase V
1998 04 17 15 41.94 -10 36.1 0.176 1.159 149.9 25.7 19.2
1998 04 18 15 39.62 -10 21.4 0.169 1.155 151.4 24.6 19.1
1998 04 19 15 37.02 -10 05.4 0.162 1.151 152.9 23.4 19.0
.
.
.
1998 05 25 06 59.80 +19 49.1 0.106 0.935 40.5 135.2 22.8
1998 05 26 06 52.08 +19 41.7 0.112 0.927 37.8 138.0 23.2
1998 05 27 06 45.04 +19 34.2 0.118 0.919 35.2 140.5 23.6
Gareth V. Williams (C) Copyright 1998 MPC M.P.E.C. 1998-H17
Target Name: 1998 HE3
D = 0.14 km
Period = 2.2 h
OC albedo = 0.1
UT # max
start date window RA, dec dist runs SNR SNR/run
----------------------------------------------------------------------
2012 May 5 03:04-11:25 215, -2 0.049 327 18 1
2012 May 6 02:33-11:06 210, 0 0.044 371 28 2
2012 May 7 01:57-10:43 203, +3 0.040 422 43 2
2012 May 8 01:14-10:16 195, +6 0.036 476 64 3
2012 May 9 00:23-09:42 186, +10 0.034 529 88 4
2012 May 9 23:27-09:03 175, +13 0.032 569 110 5
2012 May 10 22:28-08:20 163, +17 0.032 587 110 5
2012 May 11 21:30-07:36 151, +19 0.033 579 96 4
2012 May 12 20:37-06:54 140, +21 0.036 549 73 3
2012 May 13 19:51-06:15 131, +22 0.039 506 51 3
Goldstone SNRs assume Ptx = 450 kW
Goldstone tracks:
UT UT PST Duration Round-trip
DOY Date TX Window TX Window hh:mm time (sec) SNR/Run
--- ---- --------- --------- --------- --------- -------
130-131 May 09-10 2330-0720 1630-0020 May 09 7:50 32 5
132 May 11 0140-0820 1840-0120 May 10-11 6:20 32 5
TXON is listed at the earliest possible transmit time, which may occur before the end of precal.
Scheduled Arecibo tracks:
UT UT AST PST Duration Round-trip
DOY Date TX Window TX Window TX Window hh:mm time (sec) SNR/Run
--- ---- --------- --------- --------- --------- ---------- ---------
130-131 May 09-10 2344-0215 1944-2215 May 09 1644-1915 May 09 2:31 32 110
131-132 May 10-11 2250-0128 1850-2115 May 10 1550-1815 May 10 2:25 32 120
132-133 May 11-12 2158-0038 1758-2038 May 11 1458-1738 May 11 2:40 33 100
From Jon Giorgini, May 07 2012, Solution 27, 232 optical measurements (1993-Apr-13 to 2012-May-3). Formal 3-sigma S/X-band uncertainties: Date__(UT)__HR:MN POS_3sigma DOP_S_3sig DOP_X_3sig RT_delay_3sig 2012-May-08 00:00 1.054 0.58 2.12 0.000254 2012-May-09 00:00 1.255 0.76 2.77 0.000246 2012-May-10 00:00 1.489 1.01 3.65 0.000230 From Horizons, 2012 Apr 17, Solution 16, #obs = 150 (1993-2012): Date__(UT)__HR:MN R.A._(J2000.0)_DEC. delta POS_3sigma DOP_S_3sig DOP_X_3sig RT_delay_3sig 2012-Apr-18 00:00 * 240.86095 -12.29012 0.16684007700845 0.796 0.32 1.17 0.000212 2012-Apr-19 00:00 *m 240.50856 -12.11527 0.15936974475972 0.840 0.34 1.24 0.000208 2012-Apr-20 00:00 *m 240.10221 -11.92337 0.15195554678288 0.886 0.36 1.31 0.000205 2012-Apr-21 00:00 *m 239.63544 -11.71204 0.14459973065372 0.938 0.38 1.39 0.000203 2012-Apr-22 00:00 *m 239.10059 -11.47842 0.13730479336390 0.994 0.41 1.49 0.000201 2012-Apr-23 00:00 *m 238.48853 -11.21899 0.13007357079364 1.055 0.44 1.60 0.000201 2012-Apr-24 00:00 *m 237.78821 -10.92949 0.12290936000830 1.122 0.47 1.72 0.000203 2012-Apr-25 00:00 *m 236.98625 -10.60460 0.11581608649309 1.196 0.51 1.87 0.000206 2012-Apr-26 00:00 *m 236.06618 -10.23771 0.10879853371848 1.278 0.56 2.04 0.000212 2012-Apr-27 00:00 *m 235.00757 -9.82045 0.10186266061560 1.369 0.61 2.23 0.000220 2012-Apr-28 00:00 *m 233.78482 -9.34219 0.09501604537735 1.470 0.68 2.47 0.000231 2012-Apr-29 00:00 *m 232.36549 -8.78923 0.08826851417783 1.581 0.75 2.74 0.000246 2012-Apr-30 00:00 *m 230.70797 -8.14375 0.08163304510566 1.704 0.84 3.07 0.000265 2012-May-01 00:00 *m 228.75836 -7.38237 0.07512708719154 1.840 0.95 3.46 0.000288 2012-May-02 00:00 *m 226.44602 -6.47412 0.06877451078540 1.988 1.08 3.94 0.000316 2012-May-03 00:00 *m 223.67765 -5.37795 0.06260851873838 2.145 1.24 4.50 0.000351 2012-May-04 00:00 * 220.32946 -4.03960 0.05667600033455 2.306 1.42 5.16 0.000392 2012-May-05 00:00 * 216.23786 -2.38907 0.05104396440218 2.455 1.63 5.91 0.000440 2012-May-06 00:00 * 211.19115 -0.34123 0.04580866529393 2.568 1.84 6.68 0.000496 2012-May-07 00:00 * 204.93010 2.19305 0.04110724492500 2.597 2.00 7.28 0.000558 2012-May-08 00:00 * 197.17746 5.27050 0.03712866802873 2.482 2.03 7.38 0.000624 2012-May-09 00:00 * 187.73244 8.83695 0.03411317889956 2.189 1.80 6.56 0.000683 2012-May-10 00:00 * 176.65944 12.62476 0.03231927469369 1.845 1.34 4.89 0.000724 2012-May-11 00:00 * 164.49618 16.14284 0.03194326917019 1.833 1.18 4.29 0.000733 2012-May-12 00:00 * 152.22999 18.89275 0.03302597798608 2.239 1.63 5.93 0.000707 2012-May-13 00:00 * 140.89336 20.66372 0.03542891759900 2.670 2.04 7.41 0.000655 ****************************************************************************************** Apparent Magnitudes and Solar Elongations: Date__(UT)__HR:MN R.A._(J2000.0)_DEC. APmag delta S-O-T /r 2012-Apr-18 00:00 240.85511 -12.28410 19.38 0.16680499100601 146.0175 /L 2012-Apr-19 00:00 240.50219 -12.10890 19.24 0.15933510047847 147.3003 /L 2012-Apr-20 00:00 240.09525 -11.91661 19.10 0.15192138312120 148.6291 /L 2012-Apr-21 00:00 239.62783 -11.70486 18.95 0.14456609134357 150.0085 /L 2012-Apr-22 00:00 239.09226 -11.47075 18.80 0.13727172793734 151.4438 /L 2012-Apr-23 00:00 238.47938 -11.21079 18.63 0.13004113580655 152.9407 /L 2012-Apr-24 00:00 237.77815 -10.92067 18.46 0.12287762060494 154.5055 /L 2012-Apr-25 00:00 236.97516 -10.59510 18.28 0.11578511842720 156.1444 /L 2012-Apr-26 00:00 236.05391 -10.22741 18.09 0.10876842599196 157.8631 /L 2012-Apr-27 00:00 234.99395 -9.80925 17.89 0.10183351896117 159.6649 /L 2012-Apr-28 00:00 233.76966 -9.32994 17.68 0.09498799690603 161.5468 /L 2012-Apr-29 00:00 232.34854 -8.77576 17.45 0.08824171364699 163.4914 /L 2012-Apr-30 00:00 230.68893 -8.12886 17.21 0.08160768345409 165.4474 /L 2012-May-01 00:00 228.73686 -7.36579 16.95 0.07510340324464 167.2864 /L 2012-May-02 00:00 226.42162 -6.45555 16.70 0.06875280734281 168.7163 /L 2012-May-03 00:00 223.64982 -5.35700 16.47 0.06258918451955 169.1822 /L 2012-May-04 00:00 220.29755 -4.01584 16.29 0.05665953911229 168.0090 /T 2012-May-05 00:00 216.20116 -2.36204 16.16 0.05103103103912 164.8819 /T 2012-May-06 00:00 211.14894 -0.31053 16.08 0.04580010257672 159.8754 /T 2012-May-07 00:00 204.88193 2.22752 16.04 0.04110409929604 153.0562 /T 2012-May-08 00:00 197.12360 5.30812 16.05 0.03713212935558 144.3743 /T 2012-May-09 00:00 187.67472 8.87582 16.14 0.03412434997985 133.8180 /T 2012-May-10 00:00 176.60194 12.66171 16.35 0.03233871367256 121.6671 /T 2012-May-11 00:00 164.44476 16.17461 16.70 0.03197050242090 108.6750 /T 2012-May-12 00:00 152.18976 18.91795 17.19 0.03305946665553 95.9175 /T 2012-May-13 00:00 140.86626 20.68321 17.79 0.03546663845176 84.3271 /T 2012-May-14 00:00 131.09990 21.59303 18.45 0.03894588262284 74.3548 /T 2012-May-15 00:00 123.02367 21.91290 19.13 0.04323900632298 66.0091 /T 2012-May-16 00:00 116.46699 21.88517 19.81 0.04813059686617 59.0730 /T
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: 256 for 15 Hz resolution
Ranging setups:
---------------------------------------------------------------------------
127 x 64 10-usec
baud 10 usec
code 127
PRP 1270 usec
FFT 64
ncoh 1
bandwidth 787 Hz
resolution 12.3 Hz
TXOFF +150 Hz (echo in bin 32+12=44)
---------------------------------------------------------------------------
127 x 64 11-usec
baud 11 usec
code 127
PRP 1397 usec
FFT 64
ncoh 1
bandwidth 717 Hz
resolution 11.2 Hz
TXOFF +150 Hz (echo in bin 32+13=45)
-------------------------------------------------------------------------
_____________________________________________________________________
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/1998he3/PRDX.OUT.14f-14-14.s29
/PUNCH.OUT.14f-14-14.s29
/EPH.OUT.s29
POINTING
TX Offsets
Date (UTC) DOY hhmmss RA Dec Macro LHA Dec RTT OSOD
2012 05 11 132 010000 164.1369 16.2108 A 31.9
2012 05 11 132 020000 163.6052 16.3444 A 31.9
2012 05 11 132 030000 163.0718 16.4754 A 4.70 1.20 31.9 s29
2012 05 11 132 040000 162.5379 16.6037 A 31.9
2012 05 11 132 050000 162.0050 16.7292 A 32.0
2012 05 11 132 050000 162.0050 16.7292 B 32.0
2012 05 11 132 060000 161.4745 16.8520 B 32.0
2012 05 11 132 070000 160.9473 16.9722 B 4.70 1.00 32.0 s29
2012 05 11 132 080000 160.4246 17.0900 B 32.1
2012 05 11 132 090000 159.9069 17.2058 B 32.1
Transmit offsets are given in millidegrees.
PRDX.OUT.14f-14-14.s29
TRANSMITTER: STATION #14, RECEIVER: STATION #14
RECEIVER U.T. RANGE DOPPLER LHA DEC RA EL
2012 MAY 11 01:00 31.8869125019 -29592.042 323.1961 16.2108 164.137 52.030
2012 MAY 11 01:10 31.8890498491 -31397.724 325.7914 16.2332 164.048 54.005
2012 MAY 11 01:20 31.8913146197 -33227.698 328.3868 16.2556 163.960 55.941
2012 MAY 11 01:30 31.8937084642 -35080.269 330.9822 16.2779 163.871 57.831
2012 MAY 11 01:40 31.8962329058 -36953.695 333.5777 16.3001 163.783 59.667
2012 MAY 11 01:50 31.8988893367 -38846.193 336.1733 16.3223 163.694 61.435
2012 MAY 11 02:00 31.9016790370 -40755.937 338.7689 16.3444 163.605 63.123
2012 MAY 11 02:10 31.9046031432 -42681.066 341.3646 16.3664 163.516 64.714
2012 MAY 11 02:20 31.9076626746 -44619.688 343.9603 16.3884 163.428 66.187
2012 MAY 11 02:30 31.9108585098 -46569.881 346.5560 16.4103 163.339 67.520
2012 MAY 11 02:40 31.9141913917 -48529.700 349.1518 16.4321 163.250 68.683
2012 MAY 11 02:50 31.9176619189 -50497.179 351.7476 16.4538 163.161 69.650
2012 MAY 11 03:00 31.9212705663 -52470.336 354.3434 16.4754 163.072 70.389
2012 MAY 11 03:10 31.9250176618 -54447.177 356.9392 16.4970 162.983 70.875
2012 MAY 11 03:20 31.9289033864 -56425.700 359.5351 16.5185 162.894 71.088
2012 MAY 11 03:30 31.9329278019 -58403.898 2.1309 16.5399 162.805 71.019
2012 MAY 11 03:40 31.9370907940 -60379.767 4.7267 16.5613 162.716 70.670
2012 MAY 11 03:50 31.9413921508 -62351.306 7.3225 16.5825 162.627 70.058
2012 MAY 11 04:00 31.9458314842 -64316.521 9.9183 16.6037 162.538 69.204
2012 MAY 11 04:10 31.9504082892 -66273.434 12.5141 16.6248 162.449 68.140
2012 MAY 11 04:20 31.9551219145 -68220.080 15.1098 16.6458 162.360 66.893
2012 MAY 11 04:30 31.9599715728 -70154.519 17.7055 16.6668 162.271 65.492
2012 MAY 11 04:40 31.9649563338 -72074.833 20.3012 16.6877 162.182 63.963
2012 MAY 11 04:50 31.9700751412 -73979.133 22.8967 16.7085 162.094 62.328
2012 MAY 11 05:00 31.9753268216 -75865.564 25.4923 16.7292 162.005 60.605
2012 MAY 11 05:10 31.9807100446 -77732.306 28.0877 16.7498 161.916 58.809
2012 MAY 11 05:20 31.9862233746 -79577.582 30.6831 16.7704 161.828 56.954
2012 MAY 11 05:30 31.9918652388 -81399.655 33.2785 16.7909 161.739 55.049
2012 MAY 11 05:40 31.9976339591 -83196.839 35.8737 16.8113 161.651 53.104
2012 MAY 11 05:50 32.0035277258 -84967.496 38.4689 16.8317 161.563 51.124
2012 MAY 11 06:00 32.0095446315 -86710.045 41.0639 16.8520 161.474 49.117
2012 MAY 11 06:10 32.0156826522 -88422.961 43.6589 16.8722 161.386 47.087
2012 MAY 11 06:20 32.0219396449 -90104.780 46.2538 16.8923 161.298 45.038
2012 MAY 11 06:30 32.0283134024 -91754.101 48.8485 16.9124 161.210 42.973
2012 MAY 11 06:40 32.0348015853 -93369.590 51.4432 16.9324 161.123 40.897
2012 MAY 11 06:50 32.0414017779 -94949.982 54.0377 16.9523 161.035 38.811
2012 MAY 11 07:00 32.0481114778 -96494.084 56.6321 16.9722 160.947 36.718
2012 MAY 11 07:10 32.0549281093 -98000.776 59.2264 16.9920 160.860 34.619
2012 MAY 11 07:20 32.0618490060 -99469.015 61.8206 17.0117 160.773 32.517
2012 MAY 11 07:30 32.0688714461 -100897.838 64.4146 17.0314 160.685 30.414
2012 MAY 11 07:40 32.0759925719 -102286.359 67.0085 17.0510 160.598 28.311
2012 MAY 11 07:50 32.0832096450 -103633.776 69.6023 17.0705 160.511 26.209
2012 MAY 11 08:00 32.0905197003 -104939.371 72.1959 17.0900 160.425 24.111
2012 MAY 11 08:10 32.0979197841 -106202.510 74.7894 17.1095 160.338 22.016
2012 MAY 11 08:20 32.1054069043 -107422.645 77.3827 17.1288 160.251 19.927
2012 MAY 11 08:30 32.1129780271 -108599.318 79.9759 17.1482 160.165 17.845
2012 MAY 11 08:40 32.1206300889 -109732.156 82.5690 17.1674 160.079 15.771
2012 MAY 11 08:50 32.1283600108 -110820.875 85.1619 17.1867 159.993 13.706
2012 MAY 11 09:00 32.1361646931 -111865.282 87.7547 17.2058 159.907 11.652
1998HE3 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/1998HE3/1998HE3_planning.html
Asteroid Radar Astronomy