Read MPEC 1994-E04
Read MPEC 1994-F01
Read MPEC 1994-E04
Read MPEC 1994-F01
M.P.E.C. 1994-E05 Issued 1994 Mar. 15, 22:51 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.
MARSDEN@CFA or WILLIAMS@CFA (.HARVARD.EDU, .SPAN or .BITNET)
1994 ES1
Discovered 1994 Mar. 14 by Spacewatch.
Available observations:
J94E01S* C1994 03 14.27308 11 43 28.22 +01 30 45.7 20.0 V 691
J94E01S C1994 03 14.33138 11 42 34.44 +01 29 49.2 20.6 V 691
J94E01S C1994 03 14.39889 11 41 26.44 +01 28 34.6 20.0 V 691
J94E01S C1994 03 14.44752 11 40 35.27 +01 27 34.5 20.4 V 691
J94E01S C1994 03 14.45437 11 40 27.80 +01 27 25.3 19.8 V 691
J94E01S C1994 03 15.23838 11 11 00.42 +00 44 42.6 17.4 V 691
J94E01S C1994 03 15.24597 11 10 10.17 +00 43 38.3 17.3 V 691
J94E01S C1994 03 15.25465 11 09 10.67 +00 42 20.1 17.5 V 691
J94E01S IC1994 03 15.31209 11 01 34.18 +00 32 23.7 17.0 V 691
J94E01S C1994 03 15.36829 10 51 55.46 +00 19 38.4 16.7 V 691
J94E01S C1994 03 15.41175 10 42 22.37 +00 06 50.9 16.8 V 691
J94E01S C1994 03 15.42116 10 40 00.19 +00 03 38.1 16.6 V 691
J94E01S C1994 03 15.42893 10 37 56.46 +00 00 51.4 16.7 V 691
Observer details:
691 Steward Observatory, Kitt Peak. Observer D. Rabinowitz. Measured
by J. V. Scotti.
Orbital elements:
1994 ES1
Epoch 1994 Feb. 17.0 TT = JDT 2449400.5 (M-N) Marsden
M 312.25596 (2000.0) P Q
n 0.60230655 Peri. 279.95343 +0.05870416 +0.99827275
a 1.3886442 Node 353.41068 -0.90782608 +0.05242190
e 0.5877842 Incl. 1.15432 -0.41521757 +0.02652294
P 1.64 H 28.5 G 0.15
From 13 observations 1994 Mar. 14-15, mean residual 1".4.
An initial orbit determination already on the discovery night
showed that 1994 ES1 would pass only 0.001 AU from the earth a day and a
half later (on the Ides of March), at which time it would be moving
rapidly across the sky for observers in New Zealand, Japan and Australia,
prior to running into daylight over the Indian Ocean. Four astronomers
in those countries were therefore supplied with an initial ephemeris
and alerted to the likelihood that it would be improved as the result of
further Spacewatch observations on the night after discovery. This
exercise seemed to be a useful simulation of what could be done if the
object were perceived to be a real danger to the earth. Unfortunately,
the exercise failed. The Spacewatch second-night observations were
secured, and an improved orbit was determined. Perturbations by the
earth and moon were considered separately, the minimum distances being
0.0011 AU to the earth on Mar. 15.7 TT and 0.0009 AU to the moon on
Mar. 15.9 TT. Failure was due to communication delays with Japan, bad
weather in New Zealand, and an observatory in Australia missed the
object by 0.5 deg because of inadequate allowance for parallax. The
Minor Planet Center attempted to provide topocentric ephemerides to the
Australian observatories, but these could not be communicated in time--
something that has now already been rectified. The ephemeris below is
a geocentric one with UNIVERSAL TIME as the argument. In future cases of
this type, we hope to be able to provide corresponding topocentric
ephemerides for key locations.
Ephemeris:
1994 ES1 a,e,i = 1.39, 0.59, 1 q = 0.5724
Date UT R. A. (2000) Decl. Delta r Elong. Phase V
1994 03 14.00 11 45.96 +01 38.4 0.019 1.013 177.1 2.8 20.2
1994 03 14.10 11 45.09 +01 37.4 0.018 1.012 177.4 2.5 20.0
1994 03 14.20 11 44.11 +01 36.4 0.016 1.011 177.7 2.2 19.9
1994 03 14.30 11 42.99 +01 35.1 0.015 1.010 178.1 1.9 19.7
1994 03 14.40 11 41.71 +01 33.8 0.014 1.009 178.4 1.5 19.5
1994 03 14.50 11 40.21 +01 32.1 0.013 1.008 178.8 1.2 19.3
1994 03 14.60 11 38.45 +01 30.2 0.012 1.006 179.0 1.0 19.1
1994 03 14.70 11 36.35 +01 27.9 0.011 1.005 179.0 1.0 18.9
1994 03 14.80 11 33.79 +01 25.1 0.010 1.004 178.6 1.4 18.7
1994 03 14.90 11 30.62 +01 21.6 0.0089 1.003 177.8 2.2 18.5
1994 03 15.00 11 26.59 +01 17.1 0.0078 1.002 176.8 3.2 18.3
1994 03 15.05 11 24.13 +01 14.4 0.0073 1.002 176.1 3.8 18.2
1994 03 15.10 11 21.29 +01 11.2 0.0068 1.001 175.4 4.6 18.1
1994 03 15.15 11 17.96 +01 07.5 0.0062 1.001 174.5 5.5 17.9
1994 03 15.20 11 14.01 +01 03.0 0.0057 1.000 173.5 6.5 17.8
1994 03 15.25 11 09.26 +00 57.6 0.0052 1.000 172.3 7.7 17.6
1994 03 15.30 11 03.44 +00 51.0 0.0047 0.999 170.8 9.2 17.5
1994 03 15.35 10 56.15 +00 42.6 0.0041 0.999 168.9 11.1 17.3
1994 03 15.40 10 46.76 +00 31.8 0.0036 0.998 166.5 13.4 17.1
1994 03 15.45 10 34.30 +00 17.4 0.0031 0.998 163.3 16.6 16.9
1994 03 15.50 10 17.05 -00 02.7 0.0026 0.997 159.0 21.0 16.6
1994 03 15.55 09 51.99 -00 31.8 0.0021 0.997 152.6 27.3 16.4
1994 03 15.56 09 45.62 -00 39.2 0.0021 0.996 151.0 28.9 16.3
1994 03 15.57 09 38.66 -00 47.2 0.0020 0.996 149.3 30.7 16.3
1994 03 15.58 09 31.04 -00 55.9 0.0019 0.996 147.4 32.6 16.2
1994 03 15.59 09 22.70 -01 05.3 0.0018 0.996 145.3 34.7 16.2
1994 03 15.60 09 13.54 -01 15.6 0.0017 0.996 143.0 37.0 16.2
1994 03 15.61 09 03.47 -01 26.8 0.0016 0.996 140.4 39.5 16.1
1994 03 15.62 08 52.40 -01 38.8 0.0016 0.996 137.6 42.3 16.1
1994 03 15.63 08 40.22 -01 51.8 0.0015 0.996 134.6 45.3 16.1
1994 03 15.64 08 26.84 -02 05.8 0.0014 0.996 131.2 48.7 16.1
1994 03 15.65 08 12.18 -02 20.5 0.0014 0.995 127.6 52.4 16.1
1994 03 15.66 07 56.19 -02 36.0 0.0013 0.995 123.5 56.4 16.1
1994 03 15.67 07 38.83 -02 51.8 0.0013 0.995 119.2 60.7 16.1
1994 03 15.68 07 20.17 -03 07.8 0.0012 0.995 114.5 65.4 16.2
1994 03 15.69 07 00.26 -03 23.5 0.0012 0.995 109.5 70.4 16.3
1994 03 15.70 06 39.41 -03 38.2 0.0012 0.995 104.3 75.6 16.4
1994 03 15.71 06 17.87 -03 51.6 0.0011 0.995 98.9 81.0 16.6
1994 03 15.72 05 55.99 -04 03.0 0.0011 0.995 93.5 86.5 16.8
1994 03 15.73 05 34.15 -04 12.2 0.0011 0.995 88.0 91.9 17.0
1994 03 15.74 05 12.74 -04 19.1 0.0012 0.995 82.7 97.3 17.3
1994 03 15.75 04 52.11 -04 23.5 0.0012 0.994 77.5 102.4 17.6
1994 03 15.76 04 32.52 -04 25.8 0.0012 0.994 72.6 107.3 17.9
1994 03 15.77 04 14.16 -04 26.1 0.0013 0.994 68.0 111.9 18.3
1994 03 15.78 03 57.12 -04 24.9 0.0013 0.994 63.8 116.2 18.6
1994 03 15.79 03 41.43 -04 22.5 0.0014 0.994 59.8 120.1 19.0
1994 03 15.80 03 27.07 -04 19.3 0.0014 0.994 56.3 123.7 19.4
1994 03 15.85 02 32.36 -03 57.7 0.0018 0.993 42.6 137.4 21.3
1994 03 15.90 01 57.90 -03 37.0 0.0023 0.993 33.9 146.0 23.0
1994 03 15.95 01 35.17 -03 20.7 0.0027 0.992 28.2 151.7 24.4
1994 03 16.00 01 19.31 -03 08.0 0.0032 0.992 24.2 155.7 25.7
Brian G. Marsden M.P.E.C. 1994-E05
Read MPEC 1994-E04
Read MPEC 1994-F01
Our Web policy. Index to the CBAT/MPC/ICQ pages.
MPC