2010 DJ1 Goldstone Radar Observations Planning
2010 DJ1 was discovered on Feb. 17, 2010 by the Mt. Lemmon Survey. 2010 DJ1 is a very small object, perhaps 15 meters in diameter, and it will be a very strong radar target when it approaches within 1 lunar distance (LD) late on Feb. 21. We will be tracking it at Goldstone for 2 hours, starting shortly after its closest approach. Date__(UT)__HR:MN R.A._(J2000.0)_DEC. delta(LD) RTT(sec) 2010-Feb-21 23:00 62.36523 -4.73612 0.99 2.54 2010-Feb-22 00:00 52.17470 -8.35570 1.01 2.60 2010-Feb-22 01:00 42.59813 -11.45534 1.07 2.75 2010-Feb-22 02:00 34.07817 -13.89676 1.16 2.97 Due to the short round-trip time, we will be using bistatic setup with DSS-14 transmitting and DSS-13 receiving. 2010 DJ1 is optically observable until Feb 22. after which it goes too close to the Sun.
Orbital and Physical Characteristics orbit type Apollo semimajor axis 2.200 AU eccentricity 0.70 inclination 5.6 deg perihelion distance 0.662 AU aphelion distance 3.737 AU absolute magnitude (H) 26.8 diameter 11-25 m rotation period unknown pole direction unknown lightcurve amplitude unknown spectral class unknown Last update: 2010 Feb 21
M.P.E.C. 2010-D43 Issued 2010 Feb. 18, 15:41 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
2010 DJ1
Observations:
K10D01J* C2010 02 17.40179 10 01 54.84 +20 22 33.1 21.1 V ED043G96
K10D01J C2010 02 17.40560 10 01 54.01 +20 22 31.6 21.0 V ED043G96
K10D01J C2010 02 17.40936 10 01 53.18 +20 22 30.9 21.0 V ED043G96
K10D01J C2010 02 17.41318 10 01 52.39 +20 22 29.8 20.9 V ED043G96
K10D01J C2010 02 17.43673 10 01 47.06 +20 22 15.3 20.4 R ED043H01
K10D01J C2010 02 17.44292 10 01 45.77 +20 22 13.2 20.8 R ED043H01
K10D01J C2010 02 17.45048 10 01 44.23 +20 22 10.2 20.8 R ED043H01
K10D01J C2010 02 17.45751 10 01 42.81 +20 22 07.5 20.8 R ED043H01
K10D01J KC2010 02 18.24613 09 59 21.90 +20 19 38.7 20.1 C ED043G58
K10D01J KC2010 02 18.25182 09 59 20.19 +20 19 38.8 20.0 C ED043G58
K10D01J KC2010 02 18.25750 09 59 18.50 +20 19 38.9 20.1 C ED043G58
K10D01J C2010 02 18.28192409 59 04.19 +20 19 34.0 20.5 V ED043H21
K10D01J C2010 02 18.29094 09 59 05.96 +20 19 56.7 20.4 V ED043G96
K10D01J C2010 02 18.29404709 59 00.34 +20 19 29.5 20.8 V ED043H21
K10D01J C2010 02 18.29461 09 59 04.84 +20 19 56.1 20.8 V ED043G96
K10D01J C2010 02 18.29825 09 59 03.62 +20 19 55.4 20.3 V ED043G96
K10D01J C2010 02 18.30021709 58 58.40 +20 19 27.4 20.4 V ED043H21
K10D01J C2010 02 18.30193 09 59 02.43 +20 19 54.1 20.6 V ED043G96
K10D01J C2010 02 18.30920 09 58 59.29 +20 19 47.1 19.9 R ED043H01
K10D01J C2010 02 18.31425 09 58 57.64 +20 19 45.8 20.0 R ED043H01
K10D01J C2010 02 18.32160 09 58 55.24 +20 19 43.6 19.9 R ED043H01
K10D01J C2010 02 18.32825 09 58 53.06 +20 19 41.5 19.9 R ED043H01
K10D01J C2010 02 18.33975 09 58 49.98 +20 19 47.3 20.7 R ED043926
K10D01J C2010 02 18.34455 09 58 48.36 +20 19 45.7 20.8 R ED043926
K10D01J C2010 02 18.34937 09 58 46.78 +20 19 44.3 21.2 R ED043926
Observer details:
926 Tenagra II Observatory. Observers P. R. Holvorcem, M. Schwartz. Measurer
P. R. Holvorcem. 0.81-m f/7 Ritchey-Chretien + CCD.
G58 Chabot Space and Science Center, Oakland. Observers G. McKeegan, C. Jung.
0.9-m f/8 Cassegrain + CCD + f/6.3 focal reducer.
G96 Mt. Lemmon Survey. Observer R. E. Hill. Measurers J. D. Ahern,
E. C. Beshore, A. Boattini, G. J. Garradd, A. R. Gibbs, A. D. Grauer,
R. E. Hill, R. A. Kowalski, S. M. Larson, R. H. McNaught. 1.5-m reflector
+ CCD.
H01 Magdalena Ridge Observatory, Socorro. Observer W. H. Ryan. 2.4-m f/8.9
reflector + CCD.
H21 Astronomical Research Observatory, Westfield. Observer R. Holmes.
Measurer S. Foglia.
Orbital elements:
2010 DJ1 Earth MOID = 0.0011 AU
Epoch 2010 Jan. 4.0 TT = JDT 2455200.5 MPC
M 331.87262 (2000.0) P Q
n 0.30181709 Peri. 259.24550 -0.61969139 +0.78352237
a 2.2011020 Node 332.30024 -0.67634453 -0.56256869
e 0.6990471 Incl. 5.62414 -0.39817165 -0.26383548
P 3.27 H 26.8 G 0.15 U 9
Residuals in seconds of arc
100217 G96 0.9+ 0.9+ 100218 G58 0.6+ 0.7+ 100218 H01 0.8+ 0.7+
100217 G96 0.7+ 0.6+ 100218 G58 0.9+ 1.1+ 100218 H01 0.8+ 0.8+
100217 G96 0.4+ 1.0+ 100218 H21 0.9+ 1.0+ 100218 H01 0.9+ 0.8+
100217 G96 0.8+ 1.1+ 100218 G96 0.0 0.7+ 100218 H01 1.0+ 0.7+
100217 H01 0.6+ 0.8+ 100218 H21 0.7+ 0.6+ 100218 926 0.6+ 0.5+
100217 H01 0.4+ 0.9+ 100218 G96 1.0+ 0.9+ 100218 926 0.3+ 0.5+
100217 H01 0.4+ 0.8+ 100218 G96 0.4+ 0.9+ 100218 926 0.7+ 0.8+
100217 H01 0.5+ 0.8+ 100218 H21 0.9+ 0.8+
100218 G58 0.8+ 0.3+ 100218 G96 0.6+ 0.5+
Ephemeris:
2010 DJ1 a,e,i = 2.20, 0.70, 6 q = 0.6624
Date TT R. A. (2000) Decl. Delta r Elong. Phase V
2010 02 13 10 07.88 +20 24.8 0.103 1.090 171.2 7.9 22.6
2010 02 14 10 07.13 +20 25.2 0.0918 1.078 171.6 7.7 22.3
2010 02 15 10 06.16 +20 25.3 0.0801 1.067 171.8 7.6 22.0
2010 02 16 10 04.84 +20 25.0 0.0685 1.056 171.9 7.6 21.6
2010 02 17 10 02.98 +20 23.9 0.0570 1.044 171.7 7.8 21.2
2010 02 18 10 00.18 +20 21.7 0.0454 1.033 171.4 8.3 20.7
2010 02 19 09 55.49 +20 16.9 0.0339 1.022 170.6 9.1 20.1
2010 02 20 09 46.06 +20 05.1 0.0225 1.011 169.0 10.8 19.3
2010 02 21 09 17.62 +19 16.6 0.0112 1.000 163.5 16.4 17.9
2010 02 22 03 27.27 -07 45.9 0.00263 0.988 75.7 104.2 17.7
2010 02 23 23 04.39 -20 49.6 0.0124 0.977 14.5 165.3 30.5
Sonia Keys (C) Copyright 2010 MPC M.P.E.C. 2010-D43
Target Name: 2010 DJ1
HMag: 26.8
Diameter: 0.015 km (plus/minus a factor of two)
Period: 0.5 h (a standard guess for really small objects)
# SNR/ SNR/
Start date UT window RA, dec dist runs date RTT
----------------------------------------------------------------
2010 Feb 21 01:45-11:19 134, 18 0.008 700 90 4
2010 Feb 21 22:10-02:54 48, -10 0.003 700 4100 170
2010 Feb 22 18:02-23:37 348, -21 0.011 531 20 1
Goldstone SNRs assume Ptx = 430 kW, bistatic observations
Goldstone track:
UT UT PDT Duration Round-trip
DOY Date TX Window TX Window hh:mm time (sec) SNR/RTT
--- ---- --------- --------- --------- ------- -------
052 Feb 21/22 2355-0155 1555-1755 Feb 21 02:00 2.7 170
From Jon Giorgini, Feb 21, 2010: With 91 optical measurements (2010-Feb-17 9:40 to 2010-Feb-21 14:36, which includes the e-mailed data from R. McNaught and P. Halvorcem), 2010 DJ1 solution #10 was estimated. Formal 3-sigma X-band uncertainties are below: Date__(UT)__HR:MN POS_3sigma DOP_X_3sig RT_delay_3sig 2010-Feb-21 23:00 13.992 114.66 0.002074 2010-Feb-22 00:00 14.550 626.49 0.002134 2010-Feb-22 01:00 14.244 1082.16 0.002261 2010-Feb-22 02:00 13.369 1454.46 0.002443 2010-Feb-22 03:00 12.245 1742.19 0.002670 From Jon Giorgini, Feb 20, 2010: With 64 optical measurements (2010-Feb-17 09:40 to 2010-Feb-20 22:22), 2010 DJ1 solution #7 was estimated. Formal 3-sigma X-band certainties are shown below. Date__(UT)__HR:MN POS_3sigma DOP_X_3sig RT_delay_3sig 2010-Feb-21 22:00 147.389 286.67 0.004733 2010-Feb-21 23:00 158.944 87.29 0.004601 2010-Feb-22 00:00 159.503 453.79 0.004645 2010-Feb-22 01:00 150.152 780.26 0.004860 2010-Feb-22 02:00 135.008 1046.88 0.005219 2010-Feb-22 03:00 118.220 1252.82 0.005686 JPL/Horizons solution #4: 41 measurements (2 days) Date__(UT)__HR:MN POS_3sigma DOP_X_3sig RT_delay_3sig 2010-Feb-21 22:00 1403.064 1178.54 0.019670 2010-Feb-21 23:00 1480.329 376.16 0.018815 2010-Feb-22 00:00 1453.336 1895.15 0.019176 2010-Feb-22 01:00 1338.909 3247.53 0.020638 2010-Feb-22 02:00 1178.933 4351.12 0.022809 2010-Feb-22 03:00 1011.913 5203.11 0.025341 From Jon Giorgini, Feb 19, 2010: With 28 optical measurements 2010-Feb-17 to 2010-Feb-19, 2010 DJ1 soln. #3 formal 3-sigma X-band uncertainties are: Date__(UT)__HR:MN POS_3sigma DOP_X_3sig RT_delay_3sig 2010-Feb-21 22:00 5845.004 2547.74 0.027777 2010-Feb-21 23:00 6094.925 756.98 0.034534 2010-Feb-22 00:00 5901.087 3941.08 0.045964 2010-Feb-22 01:00 5367.790 6741.42 0.058828 2010-Feb-22 02:00 4682.811 9004.42 0.071260 2010-Feb-22 03:00 3997.671 10744.46 0.082627 JPL/Horizons solution #1: 25 measurements (1 day arc) Date__(UT)__HR:MN R.A._(J2000.0)_DEC. delta POS_3sigma DOP_X_3sig RT_delay_3sig 2010-Feb-19 00:00 *m 148.92669 20.23397 0.03393950002568 53.232 61259.85 0.465634 2010-Feb-20 00:00 *m 146.60123 20.01370 0.02249897980400 485.851 61143.61 0.693210 2010-Feb-21 00:00 *m 139.58705 19.14106 0.01116977711886 4394.048 60289.17 1.212284 2010-Feb-22 00:00 *m 52.17460 -8.35670 0.00260367453641 142637.351 10174.66 0.357636 2010-Feb-23 00:00 *m 345.85965 -20.96629 0.01233639234610 9792.062 59683.25 2.366127 Uncertainties at hourly intervals during the track: Date__(UT)__HR:MN POS_3sigma DOP_X_3sig RT_delay_3sig 2010-Feb-21 23:00 146897.613 1828.82 0.037498 2010-Feb-22 00:00 142639.419 10174.22 0.357623 2010-Feb-22 01:00 130029.789 20516.10 0.669646 2010-Feb-22 02:00 113378.135 29099.99 0.934477 Solar elongations and visual magnitudes: Date__(UT)__HR:MN R.A._(J2000.0)_DEC. APmag delta S-O-T /r 2010-Feb-17 00:00 150.77661 20.36988 21.27 0.05694332237305 171.7633 /L 2010-Feb-18 00:00 150.08432 20.32536 20.78 0.04542365435311 171.4082 /T 2010-Feb-19 00:00 148.92673 20.23405 20.15 0.03393952551262 170.6797 /T 2010-Feb-20 00:00 146.60131 20.01382 19.30 0.02249900370190 169.0920 /T 2010-Feb-21 00:00 139.58720 19.14130 17.96 0.01116979680542 163.6800 /T 2010-Feb-22 00:00 52.17470 -8.35570 17.72 0.00260364055778 75.9416 /T 2010-Feb-23 00:00 345.85953 -20.96610 n.a. 0.01233636107879 14.4963 /T
CW setup: --------------------------------------------------------------------------- TX polarization RCP RCV polarization LCP & RCP Frequency hops: 2 Dwell 10 seconds Bandwidth: 16000 Hz <-- NOTE THE BANDWIDTH! Sampling interval: 625 x 0.1 usec VME FFT for PSD files: 16384 for 0.98-Hz resolution After the first orbital update, we will change CW setup to: TX polarization RCP RCV polarization LCP & RCP Frequency hops: 2 Dwell 10 seconds Bandwidth: 4000 Hz <-- NOTE THE BANDWIDTH! Sampling interval: 2500 x 0.1 usec VME FFT for PSD files: 4096 for 1-Hz resolution Chirp Test: ------------- Joseph and Clement recommended 20 MHz chirp with 20 usec PRP which will PFS sample at 20 MHz (0.05 usec baud) and Digital RCV at 80 MHz (0.0125 usec baud).
OSOD and predicts are on aardvark:
/export/data3/osod/ops/2010dj1/PRDX.OUT.14v-13-13.s10
/PUNCH.OUT.14v-13-13.s10
/EPH.OUT.s10
POINTING
TX Offsets
Date (UTC) DOY hhmmss RA Dec Macro LHA Dec RTT OSOD
2010 02 21 052 230000 63.0196 -4.51420 A 2.55
2010 02 22 053 000000 52.8219 -8.14010 A 7.20 -2.40 2.61 s10
2010 02 22 053 010000 43.2102 -11.2614 A 2.75
2010 02 22 053 010000 43.2102 -11.2614 B 2.75
2010 02 22 053 020000 34.6386 -13.7301 B 6.60 -1.70 2.97 s10
2010 02 22 053 030000 27.2904 -15.5746 B 3.25
Transmit offsets are given in millidegrees.
PRDX.OUT.14v-13-13.s10
TRANSMITTER: STATION #14, RECEIVER: STATION #13
2010 FEB 21 23:50 2.5895346281 -209227.199 338.0011 -7.5627 54.493 42.428
2010 FEB 22 00:00 2.6054539760 -244846.041 342.1829 -8.1390 52.818 43.469
2010 FEB 22 00:10 2.6238450760 -279820.946 346.3480 -8.7008 51.160 44.200
2010 FEB 22 00:20 2.6446621652 -314064.824 350.4936 -9.2471 49.522 44.608
2010 FEB 22 00:30 2.6678513086 -347502.262 354.6174 -9.7768 47.905 44.689
2010 FEB 22 00:40 2.6933536436 -380067.870 358.7170 -10.2893 46.312 44.447
2010 FEB 22 00:50 2.7211060849 -411706.457 2.7905 -10.7839 44.745 43.893
2010 FEB 22 01:00 2.7510420386 -442372.954 6.8360 -11.2602 43.206 43.045
2010 FEB 22 01:10 2.7830921052 -472032.142 10.8520 -11.7180 41.697 41.924
2010 FEB 22 01:20 2.8171847452 -500658.211 14.8370 -12.1571 40.219 40.557
2010 FEB 22 01:30 2.8532469364 -528234.150 18.7901 -12.5775 38.773 38.971
2010 FEB 22 01:40 2.8912047385 -554751.093 22.7101 -12.9795 37.360 37.192
2010 FEB 22 01:50 2.9309838619 -580207.539 26.5965 -13.3631 35.980 35.247
2010 FEB 22 02:00 2.9725101456 -604608.562 30.4488 -13.7288 34.635 33.159
2010 DJ1 GOLDSTONE MASTERLOG
==============================================================================
Receive TX
Setup hops dwell code ncoh FFT runs start -stop OSOD offset Poln Notes
------------------------------------------------------------------------------
POINTING
TX Offsets
Date (UTC) DOY hhmmss RA Dec Macro LHA Dec RTT OSOD
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/2010DJ1/2010DJ1_planning.html
Asteroid Radar Astronomy