Strange Data for 2000 YE44

B. Hudgens Apr 10, 2002

Bill and others,


There may be a problem (bug?) in plotting this asteroid... Guide shows it
completely different than that of MPE Services.
See below.
Guide shows 9th mag but MPE list it at 24th mag??
Element sets do not even look similar ??

There may be others, but haven't come across them yet.

Thanks, Ben Hudgens , Memphis, TN

=============

Guide 8.0 generated the following info on 2000 YE44......

2000 YE44
Date RA declination r delta mag Elong
---- -- ----------- - ----- --- -----
10 Apr 2002 19 13h40m26.37s + 2 11.273' 2.820 1.831 9.6 168.1
11 Apr 2002 19 13h39m36.65s + 2 15.893' 2.820 1.831 9.6 168.2
12 Apr 2002 19 13h38m46.74s + 2 20.414' 2.820 1.831 9.6 168.2
13 Apr 2002 19 13h37m56.70s + 2 24.829' 2.820 1.831 9.6 168.1
14 Apr 2002 19 13h37m06.59s + 2 29.133' 2.820 1.832 9.6 167.8
15 Apr 2002 19 13h36m16.47s + 2 33.321' 2.821 1.833 9.6 167.5
16 Apr 2002 19 13h35m26.39s + 2 37.387' 2.821 1.834 9.6 167.0
17 Apr 2002 19 13h34m36.42s + 2 41.327' 2.821 1.835 9.6 166.5
18 Apr 2002 19 13h33m46.61s + 2 45.135' 2.821 1.837 9.6 165.8
19 Apr 2002 19 13h32m57.02s + 2 48.809' 2.821 1.838 9.6 165.2
20 Apr 2002 19 13h32m07.71s + 2 52.342' 2.821 1.841 9.7 164.4
21 Apr 2002 19 13h31m18.72s + 2 55.732' 2.822 1.843 9.7 163.6
22 Apr 2002 19 13h30m30.11s + 2 58.975' 2.822 1.846 9.7 162.8
23 Apr 2002 19 13h29m41.93s + 3 02.068' 2.822 1.849 9.7 161.9
24 Apr 2002 19 13h28m54.23s + 3 05.007' 2.822 1.852 9.7 161.0
25 Apr 2002 19 13h28m07.06s + 3 07.790' 2.822 1.855 9.8 160.1

2000 YE44 mag 9.6
Period of orbit 4.56 years (1663.9 days)
Perihelion distance 2.66 AU
Aphelion distance 2.84 AU
Orbital elements:
Semimajor axis 2.7479651 AU
Eccentricity 0.0320723
Inclination of orbit 7.7193454 degrees
Argument of perihelion 314.5102949 degrees
Long. ascending node 101.8856069 degrees
Mean anomaly 148.6942201 degrees
Epoch of elements JD 2452400.5 ( 6 May 2002 0:00)
Right ascension: 13h40m26.377s
Declination: + 2 11.2733'
Mean position at current epoch:
Right ascension: 13h40m33.319s
Declination: + 2 10.5856'
Apparent position at current epoch:
Right ascension: 13h40m33.516s
Declination: + 2 10.5490'
Dist from home planet: 1.83135328 AU (273,966,550 km)
Heliocentric position: lon 201.89606 lat 7.60321
Heliocentric radius 2.81959 AU
99.87% illuminated
Phase angle: 4.19 degrees
Elongation from Sun 168.15 degrees (morning sky)
Speed of apparent motion: 33.789"/hour at position angle 290.2
Assumed asteroid diameter 490.9 km
Absolute magnitude: 5.64
Slope parameter: 0.15
Orbital arc: 6 days
13 observations made to determine orbit
Orbit computed on 15 01 2001
Current ephemeris uncertainty (CEU) on 30 11 2001:
1.1E+05 arcseconds, changing by 4.3E+02 arcseconds/day
Next peak CEU: 2.4E+08 arcsec, on 12 04 2002
Maximum CEU in next ten years: 2.6E+08 arcsec, on 04 09 2008
The orbital eccentricity is assumed, not computed.

================
Below shows what the MPE Service generated tonight....

2000 YE44

Epoch 2000 Dec. 22.0 TT = JDT 2451900.5 Williams
M 355.97680 (2000.0) P Q
n 0.33015336 Peri. 0.52834 -0.21456938 -0.97605551
a 2.0732845 Node 101.86228 +0.89597884 -0.21125983
e 0.2141581 Incl. 2.09149 +0.38882116 -0.05181634
P 2.99 H 20.0 G 0.15
From 13 observations 2000 Dec. 30-2001 Jan. 5. E-assumed.

Last observed on 2001 Jan. 5. Elements from MPO 8582.

Further observations? Leave for survey recovery.

K00Y44E
Date UT R.A. (J2000) Decl. Delta r El. Ph. V
Motion

"/min P.A.
2002 04 11 00 19 17.51 -21 31.7 2.222 2.483 92.9 23.8 24.8
0.52 083.7
2002 04 12 00 19 18.38 -21 30.4 2.209 2.484 93.7 23.7 24.8
0.50 083.6
2002 04 13 00 19 19.23 -21 29.1 2.197 2.485 94.5 23.7 24.8
0.49 083.6
2002 04 14 00 19 20.05 -21 27.8 2.184 2.486 95.3 23.7 24.8
0.48 083.6
2002 04 15 00 19 20.86 -21 26.5 2.172 2.487 96.1 23.7 24.8
0.47 083.6
2002 04 16 00 19 21.64 -21 25.3 2.159 2.487 96.9 23.6 24.8
0.45 083.6
2002 04 17 00 19 22.41 -21 24.1 2.147 2.488 97.7 23.6 24.7
0.44 083.6
2002 04 18 00 19 23.15 -21 22.9 2.134 2.489 98.5 23.5 24.7
0.43 083.6
2002 04 19 00 19 23.86 -21 21.8 2.122 2.490 99.3 23.5 24.7
0.41 083.6
2002 04 20 00 19 24.56 -21 20.7 2.110 2.490 100.1 23.4 24.7
0.40 083.6
2002 04 21 00 19 25.23 -21 19.6 2.097 2.491 100.9 23.3 24.7
0.39 083.6
2002 04 22 00 19 25.87 -21 18.6 2.085 2.492 101.7 23.3 24.7
0.37 083.7
2002 04 23 00 19 26.50 -21 17.7 2.073 2.493 102.6 23.2 24.7
0.36 083.7
2002 04 24 00 19 27.10 -21 16.8 2.060 2.493 103.4 23.1 24.6
0.34 083.8
2002 04 25 00 19 27.67 -21 15.9 2.048 2.494 104.2 23.0 24.6
0.33 083.9
2002 04 26 00 19 28.22 -21 15.1 2.036 2.495 105.1 22.9 24.6
0.32 084.0
2002 04 27 00 19 28.75 -21 14.3 2.024 2.495 105.9 22.8 24.6
0.30 084.1
2002 04 28 00 19 29.25 -21 13.6 2.012 2.496 106.8 22.7 24.6
0.29 084.3
2002 04 29 00 19 29.72 -21 13.0 2.000 2.497 107.6 22.6 24.6
0.27 084.5
2002 04 30 00 19 30.17 -21 12.4 1.988 2.497 108.5 22.5 24.6
0.25 084.7
2002 05 01 00 19 30.59 -21 11.8 1.976 2.498 109.4 22.4 24.5
0.24 084.9