2010 AF40 Goldstone Radar Observations Planning
2010 AF40 was discovered on Jan 12, 2010 by Mt. Lemmon Survey. 2010 AF40 is a small object (26-59 m), but it will be an excellent radar target when it approaches within 2.3 LD on Jan 21. We will start tracking it at Goldstone shortly before its closest approach. Our track is scheduled for Jan 21, from 00:50 UT to 02:40 UT. Date__(UT)__HR:MN R.A._(J2000.0)_DEC. delta(LD) RTT(sec) 2010-Jan-21 00:30 55.76316 32.34769 2.6 6.6 2010-Jan-21 01:00 54.13880 32.40435 2.5 6.5 2010-Jan-21 01:30 52.47859 32.44069 2.5 6.4 2010-Jan-21 02:00 50.78420 32.45530 2.5 6.4 2010-Jan-21 02:30 49.05761 32.44685 2.5 6.3 2010-Jan-21 03:00 47.30112 32.41407 2.4 6.3 Due to a short RTT, we will be using bistatic setup with DSS-14 transmitting and DSS-13 receiving. 2010 AF40 is optically observable until Jan 22 after which it goes too close to the Sun.
Orbital and Physical Characteristics orbit type Apollo semimajor axis 1.235 AU eccentricity 0.47 inclination 4.4° perihelion distance 0.660 AU aphelion distance 1.810 AU absolute magnitude (H) 25.0 diameter 26-59 m rotation period 0.357 h (Joe Pollock and Peter Kusnirak, pers. comm.) pole direction unknown lightcurve amplitude ~1 mag spectral class unknown Last update: 2010 Jan 20
M.P.E.C. 2010-A68 Issued 2010 Jan. 13, 15:02 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 AF40
Observations:
K10A40F* C2010 01 12.35742 07 57 11.41 +13 03 28.0 20.5 V EA068G96
K10A40F C2010 01 12.36453 07 57 10.36 +13 03 33.7 20.3 V EA068G96
K10A40F C2010 01 12.37176 07 57 09.32 +13 03 39.6 20.3 V EA068G96
K10A40F C2010 01 12.37897 07 57 08.20 +13 03 45.5 20.1 V EA068G96
K10A40F C2010 01 12.40453 07 57 04.12 +13 04 02.1 19.4 R EA068H01
K10A40F C2010 01 12.41284 07 57 02.91 +13 04 08.5 19.5 R EA068H01
K10A40F C2010 01 12.42015 07 57 01.87 +13 04 14.2 19.4 R EA068H01
K10A40F C2010 01 12.43981 07 56 59.07 +13 04 29.1 19.4 R EA068H01
K10A40F C2010 01 12.48383 07 56 53.20 +13 05 07.2 EA068291
K10A40F C2010 01 12.48761 07 56 52.69 +13 05 10.2 EA068291
K10A40F C2010 01 12.49138 07 56 52.17 +13 05 13.0 EA068291
K10A40F C2010 01 13.26122 07 55 27.00 +13 17 36.8 19.3 R EA068H01
K10A40F C2010 01 13.26824 07 55 25.75 +13 17 44.6 19.3 R EA068H01
K10A40F IC2010 01 13.27535907 55 22.06 +13 17 41.2 EA068H21
K10A40F C2010 01 13.27582 07 55 24.40 +13 17 52.9 19.4 R EA068H01
K10A40F IC2010 01 13.27999207 55 21.22 +13 17 46.3 19.8 V EA068H21
K10A40F C2010 01 13.28292 07 55 23.12 +13 18 00.8 19.5 R EA068H01
K10A40F C2010 01 13.32619 07 55 15.73 +13 18 50.6 19.6 R EA068854
K10A40F C2010 01 13.32907 07 55 15.34 +13 18 54.4 19.6 R EA068854
K10A40F C2010 01 13.34346 07 55 12.43 +13 19 11.6 19.6 R EA068854
Observer details:
291 LPL/Spacewatch II. Observer R. S. McMillan. 1.8-m f/2.7 reflector + CCD.
854 Sabino Canyon Observatory, Tucson. Observer J. E. McGaha. 0.36-m f/10.0
Schmidt-Cassegrain + CCD.
G96 Mt. Lemmon Survey. Observer A. D. Grauer. 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 AF40 Earth MOID = 0.0019 AU
Epoch 2010 Jan. 4.0 TT = JDT 2455200.5 MPC
M 306.78932 (2000.0) P Q
n 0.72339923 Peri. 93.47933 -0.83763793 +0.54226603
a 1.2289966 Node 119.36895 -0.52629209 -0.76904469
e 0.4606513 Incl. 4.32045 -0.14621677 -0.33840481
P 1.36 H 25.0 G 0.15 U 9
Residuals in seconds of arc
100112 G96 0.4- 0.0 100112 H01 0.1- 0.1+ 100113 H01 0.2- 0.0
100112 G96 0.2- 0.0 100112 291 0.1- 0.1+ 100113 H21 0.1- 0.1-
100112 G96 0.4+ 0.1+ 100112 291 0.0 0.2+ 100113 H01 0.3- 0.1+
100112 G96 0.3- 0.2+ 100112 291 0.2- 0.2+ 100113 854 0.0 0.6-
100112 H01 0.0 0.2+ 100113 H01 0.4- 0.1+ 100113 854 2.0+ 0.1+
100112 H01 0.1- 0.2+ 100113 H01 0.4- 0.1+ 100113 854 1.7- 1.9+
100112 H01 0.1+ 0.2+ 100113 H21 0.1+ 0.3-
Ephemeris:
2010 AF40 a,e,i = 1.23, 0.46, 4 q = 0.6629
Date TT R. A. (2000) Decl. Delta r Elong. Phase V
2010 01 14 07 53.60 +13 32.9 0.0609 1.044 171.7 7.8 19.6
2010 01 15 07 50.45 +13 58.2 0.0527 1.036 172.7 6.9 19.2
2010 01 16 07 46.13 +14 32.9 0.0445 1.028 173.5 6.3 18.8
2010 01 17 07 39.83 +15 23.1 0.0364 1.020 173.5 6.2 18.3
2010 01 18 07 29.86 +16 40.9 0.0284 1.012 172.1 7.7 17.8
2010 01 19 07 11.82 +18 55.1 0.0205 1.004 167.8 11.9 17.3
2010 01 20 06 30.25 +23 26.8 0.0129 0.996 157.3 22.5 16.6
2010 01 21 04 01.77 +32 04.7 0.00682 0.988 123.4 56.3 16.2
2010 01 22 23 07.80 +15 48.4 0.00773 0.980 55.2 124.4 19.6
2010 01 23 21 36.75 +02 19.4 0.0143 0.972 28.9 150.7 24.3
2010 01 24 21 06.63 -02 28.0 0.0220 0.964 19.8 159.8 27.5
Sonia Keys (C) Copyright 2010 MPC M.P.E.C. 2010-A68
Target Name: 2010 AF40
HMag: 25
Diameter: 0.032 km (plus/minus a factor of two)
Period: 0.2 h (a conservative lower bound)
NOTE: Bistatic SNRs
# max
Start date UT window RA, dec dist runs SNR SNR/run
-----------------------------------------------------------------
2010 Jan 20 00:51-11:07 92, 26 0.011 700 50 2
2010 Jan 20/21 22:13-07:32 48, 32 0.006 700 350 14
2010 Jan 21/22 18:14-03:17 347, 16 0.008 700 170 7
Goldstone SNRs assume Ptx = 430 kW
Goldstone track:
UT UT PST Duration Round-trip
DOY Date TX Window TX Window hh:mm time (sec) SNR/Run
--- ---- --------- --------- --------- ------- -------
021 Jan 21 0050-0240 1650-1840 Jan 21 01:50 6.4 14
From Jon Giorgini, Jan-20-2010, s#9, 63 optical measurements (2010-Jan-12 to 2010-jan-19), Date__(UT)__HR:MN POS_3sigma DOP_X_3sig RT_delay_3sig 2010-Jan-21 00:00 16.554 1718.56 0.032271 2010-Jan-21 00:20 16.992 1662.31 0.032034 2010-Jan-21 00:40 17.445 1604.65 0.031804 2010-Jan-21 01:00 17.915 1545.58 0.031582 2010-Jan-21 01:20 18.402 1485.14 0.031369 2010-Jan-21 01:40 18.909 1423.35 0.031163 2010-Jan-21 02:00 19.435 1360.24 0.030967 2010-Jan-21 02:20 19.981 1295.85 0.030778 2010-Jan-21 02:40 20.546 1230.23 0.030599 JPL/Horizons solution #7: # obs: 63 (7 days) Date__(UT)__HR:MN R.A._(J2000.0)_DEC. delta POS_3sigma DOP_S_3sig DOP_X_3sig RT_delay_3sig 2010-Jan-20 00:00 *m 97.18294 23.54809 0.01263172202553 2.931 965.95 3454.91 0.061176 2010-Jan-21 00:00 *m 57.74077 32.17836 0.00661930641587 16.515 480.31 1717.93 0.032258 2010-Jan-22 00:00 *m 344.74542 14.54771 0.00794043322758 26.813 735.21 2629.60 0.038716 2010-Jan-23 00:00 *m 323.39489 1.77557 0.01473794353635 18.422 1008.19 3605.97 0.071553 JPL/Horizons solution #6: # obs: 47 (6 days) Date__(UT)__HR:MN R.A._(J2000.0)_DEC. delta POS_3sigma DOP_S_3sig DOP_X_3sig RT_delay_3sig 2010-Jan-20 00:00 *m 97.18278 23.54806 0.01264407291414 39.845 1863.11 6663.77 0.112934 2010-Jan-21 00:00 *m 57.73976 32.17822 0.00662576352822 241.287 929.76 3325.45 0.058666 2010-Jan-22 00:00 *m 344.74511 14.54730 0.00794836670114 242.525 1412.79 5053.11 0.076723 2010-Jan-23 00:00 *m 323.39516 1.77559 0.01475265166976 92.605 1940.57 6940.81 0.141922 JPL/Horizons solution #4: 40 measurements (2010-Jan-12 to 2010-Jan-16) Date__(UT)__HR:MN POS_3sigma DOP_X_3sig RT_delay_3sig 2010-Jan-21 00:00 2935.868 4832.20 0.068729 2010-Jan-21 01:00 3108.311 4358.94 0.066660 2010-Jan-21 02:00 3276.763 3851.60 0.064823 2010-Jan-21 03:00 3437.074 3312.65 0.063334 2010-Jan-21 04:00 3584.937 2746.04 0.062328 Optical observations: Date__(UT)__HR:MN R.A._(J2000.0)_DEC. APmag delta S-O-T /r 2010-Jan-16 00:00 116.52250 14.55289 18.81 0.04461060974815 173.4546 /T 2010-Jan-17 00:00 114.93533 15.39586 18.35 0.03641059277993 173.5284 /T 2010-Jan-18 00:00 112.41026 16.70841 17.85 0.02828585302582 172.0584 /T 2010-Jan-19 00:00 107.79910 18.99011 17.29 0.02029529036767 167.7129 /T 2010-Jan-20 00:00 96.99451 23.66307 16.61 0.01265644708987 156.7408 /T 2010-Jan-21 00:00 57.35031 32.27212 16.22 0.00665746311617 120.7734 /T 2010-Jan-22 00:00 344.76002 14.62271 n.a. 0.00800337284678 52.8616 /T
CW setup: --------------------------------------------------------------------------- TX polarization RCP RCV polarization LCP and RCP Frequency hops: 2 Dwell 10 seconds Bandwidth: 16000 Hz <-- please 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: 0.2 usec is max resolution in delay
OSOD and predicts are on aardvark:
/export/data3/osod/ops/2010af40/PRDX.OUT.14-13-13.s9
/PUNCH.OUT.14-13-13.s9
/EPH.OUT.s9
POINTING
TX Offsets
Date (UTC) DOY hhmmss RA Dec Macro LHA Dec RTT OSOD
2010 01 21 021 000000 57.9086 32.2115 A 6.6
2010 01 21 021 010000 54.6277 32.3848 A 6.10 0.30 6.5 s9
2010 01 21 021 020000 51.1759 32.4651 A 6.4
2010 01 21 021 020000 51.1759 32.4651 B 6.4
2010 01 21 021 030000 47.5776 32.4371 B 6.30 -0.10 6.3 s9
2010 01 21 021 040000 43.8657 32.2890 B 6.3
Transmit offsets are given in millidegrees.
PRDX.OUT.14-13-13.s9
TRANSMITTER: STATION #14, RECEIVER: STATION #13
RECEIVER U.T. RANGE DOPPLER LHA DEC RA EL
2010 JAN 21 00:50 6.4800551851 342326.600 320.8090 32.3632 55.186 57.517
2010 JAN 21 01:00 6.4563017027 335422.031 323.8751 32.3861 54.627 60.015
2010 JAN 21 01:10 6.4330358126 328414.403 326.9460 32.4064 54.063 62.521
2010 JAN 21 01:20 6.4102646372 321306.525 330.0216 32.4240 53.494 65.034
2010 JAN 21 01:30 6.3879951140 314101.389 333.1018 32.4389 52.921 67.553
2010 JAN 21 01:40 6.3662339291 306802.163 336.1864 32.4509 52.343 70.075
2010 JAN 21 01:50 6.3449875777 299412.188 339.2753 32.4601 51.761 72.598
2010 JAN 21 02:00 6.3242622981 291934.971 342.3684 32.4663 51.175 75.117
2010 JAN 21 02:10 6.3040640688 284374.176 345.4657 32.4696 50.584 77.627
2010 JAN 21 02:20 6.2843986232 276733.616 348.5669 32.4697 49.990 80.115
2010 JAN 21 02:30 6.2652714103 269017.250 351.6718 32.4667 49.392 82.549
2010 JAN 21 02:40 6.2466875991 261229.166 354.7805 32.4605 48.790 84.848
2010 AF40 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/2010AF40/2010AF40_planning.html
Asteroid Radar Astronomy