Jupiter Trojan Lightcurve Project
Joshua Emery of the University of Tennessee needs lightcurves on Jupiter Trojans:
Along with several colleagues, I have a program to observe several Trojans with the Spitzer Space Telescope. None of the objects on our target list has very good light curve data, and many of them have no info whatsoever.
Rotational data on these objects would really make our analysis of the Spitzer data more robust, especially if the light curve observations are close in time to the Spitzer observations, and I was wondering if you could help us let people know that we would appreciate such observations.
Unfortunately, Spitzer only announces its schedule a few weeks in advance, so right now we don't know exactly when our targets will be observed. But since most of the targets don't have any light curve info, anytime anyone can observe would help. I could send a list of dates when each object is observable with Spitzer, if it would be helpful.
What I want kind of depends on what I can get. The following list is arranged from "really need" to "would be terrific if possible."
Amplitude - if I get nothing else, this allows me to put a realistic estimate on my albedo estimate from thermal observations (since I won't have simultaneous visible, unless . . .
Period - necessary to reasonably constrain thermal inertia of the surface.
Calibrated brightness - H magnitudes of some of these guys are not very good, probably because they haven't had lightcurve and phase effects removed.
- Close-in-time light curve - A flux calibrated light curve within a few rotations of the Spitzer observations would be heaven. Knowing the rotational phase of of the Spitzer observations would let me get a very good size and albedo (and would tighten estimates of thermal inertia, though a pole position is needed to do this well.
0.01 to 0.03 mag precision would be just fine, and I would very much enjoy having the data sent to me.
I very much encourage anyone who collects data to publish it as soon as they can. Please don't have them wait for me. That gives everyone the chance to do as much as they can with the data.
Upcoming Jupiter Trojans
 | Mag1 and Mag2 are the V mags on the first and last dates of the search period |
| Declination and Date are for brightest mag in the search period |
| Positions are geocentric, 00:00 UT |
# Name Mag1 Mag2 Dec Date
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617 Patroclus 15.47 15.25 -27 2009/05/21
884 Priamus 15.64 15.37 -31 2009/05/21
1172 Aneas 15.33 15.07 -18 2009/05/21
1173 Anchises 15.94 15.88 -25 2009/05/11
1867 Deiphobus 15.74 15.51 -40 2009/05/21
2241 Alcathous 15.70 15.43 -29 2009/05/21
2357 Phereclos 16.20 15.96 -20 2009/05/21
2674 Pandarus 16.22 15.98 -21 2009/05/21
2893 Peiroos 16.06 15.92 -05 2009/05/21
3317 Paris 15.27 15.07 +05 2009/05/21
3451 Mentor 15.32 15.13 +06 2009/05/21
7352 1994 CO 15.91 15.71 -11 2009/05/21
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617 Patroclus H: 8.19 Min: 15.25 Date: 2009/05/21
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DATE RA(2000) DC(2000) E.D. S.D. Mag PA E
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2009/05/01 15 51.25 -26 43.9 4.470 5.419 15.47 3.9 158
2009/05/06 15 48.41 -26 48.2 4.440 5.414 15.40 3.1 163
2009/05/11 15 45.43 -26 51.5 4.417 5.409 15.33 2.2 168
2009/05/16 15 42.37 -26 53.7 4.402 5.404 15.27 1.5 172
2009/05/21 15 39.27 -26 54.9 4.394 5.399 15.25 1.4 173
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884 Priamus H: 8.81 Min: 15.37 Date: 2009/05/21
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DATE RA(2000) DC(2000) E.D. S.D. Mag PA E
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2009/05/01 17 52.93 -30 40.9 3.818 4.552 15.64 9.5 132
2009/05/06 17 51.72 -30 42.5 3.763 4.551 15.57 8.7 137
2009/05/11 17 50.13 -30 43.5 3.712 4.549 15.51 7.9 142
2009/05/16 17 48.18 -30 43.7 3.667 4.548 15.44 7.0 147
2009/05/21 17 45.90 -30 42.9 3.627 4.547 15.37 6.0 152
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1172 Aneas H: 8.33 Min: 15.07 Date: 2009/05/21
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DATE RA(2000) DC(2000) E.D. S.D. Mag PA E
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2009/05/01 17 54.27 -19 10.0 4.009 4.741 15.33 9.1 132
2009/05/06 17 53.10 -18 56.2 3.951 4.738 15.27 8.4 137
2009/05/11 17 51.59 -18 42.2 3.899 4.736 15.20 7.5 142
2009/05/16 17 49.77 -18 28.2 3.852 4.734 15.14 6.6 147
2009/05/21 17 47.68 -18 14.2 3.811 4.731 15.07 5.7 152
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1173 Anchises H: 8.89 Min: 15.82 Date: 2009/05/11
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DATE RA(2000) DC(2000) E.D. S.D. Mag PA E
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2009/05/01 15 15.36 -25 08.6 4.278 5.260 15.94 2.7 166
2009/05/06 15 12.72 -24 58.0 4.258 5.255 15.87 1.9 170
2009/05/11 15 10.03 -24 46.3 4.246 5.250 15.82 1.3 173
2009/05/16 15 07.34 -24 33.7 4.241 5.245 15.82 1.5 172
2009/05/21 15 04.70 -24 20.3 4.244 5.240 15.88 2.2 168
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1867 Deiphobus H: 8.61 Min: 15.51 Date: 2009/05/21
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DATE RA(2000) DC(2000) E.D. S.D. Mag PA E
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2009/05/01 17 20.41 -39 56.3 4.161 4.934 15.74 8.2 136
2009/05/06 17 18.24 -39 53.5 4.112 4.933 15.68 7.5 141
2009/05/11 17 15.73 -39 48.8 4.068 4.932 15.63 6.7 145
2009/05/16 17 12.92 -39 41.9 4.031 4.931 15.57 5.9 150
2009/05/21 17 09.85 -39 32.9 3.999 4.931 15.51 5.1 154
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2241 Alcathous H: 8.64 Min: 15.43 Date: 2009/05/21
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DATE RA(2000) DC(2000) E.D. S.D. Mag PA E
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2009/05/01 16 55.41 -29 18.6 4.108 4.960 15.70 6.8 144
2009/05/06 16 53.30 -29 10.6 4.067 4.962 15.63 5.9 149
2009/05/11 16 50.93 -29 01.3 4.032 4.964 15.57 5.0 155
2009/05/16 16 48.34 -28 50.7 4.004 4.966 15.50 4.0 160
2009/05/21 16 45.58 -28 39.0 3.983 4.968 15.43 3.0 165
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2357 Phereclos H: 8.94 Min: 15.96 Date: 2009/05/21
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DATE RA(2000) DC(2000) E.D. S.D. Mag PA E
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2009/05/01 18 15.17 -20 19.1 4.294 4.966 16.20 9.3 127
2009/05/06 18 14.34 -20 16.6 4.234 4.967 16.15 8.7 132
2009/05/11 18 13.17 -20 14.4 4.179 4.967 16.09 8.0 137
2009/05/16 18 11.69 -20 12.5 4.129 4.967 16.03 7.2 142
2009/05/21 18 09.91 -20 10.7 4.084 4.968 15.96 6.3 147
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2674 Pandarus H: 9.00 Min: 15.98 Date: 2009/05/21
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DATE RA(2000) DC(2000) E.D. S.D. Mag PA E
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2009/05/01 18 15.87 -21 15.1 4.244 4.915 16.22 9.4 127
2009/05/06 18 15.03 -21 13.5 4.185 4.917 16.16 8.8 132
2009/05/11 18 13.85 -21 12.0 4.132 4.919 16.11 8.0 137
2009/05/16 18 12.35 -21 10.8 4.083 4.921 16.04 7.2 142
2009/05/21 18 10.55 -21 09.8 4.040 4.923 15.98 6.4 147
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2893 Peiroos H: 9.23 Min: 15.92 Date: 2009/05/21
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DATE RA(2000) DC(2000) E.D. S.D. Mag PA E
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2009/05/01 16 02.60 -05 45.3 3.939 4.878 16.06 4.8 156
2009/05/06 16 00.19 -05 38.0 3.915 4.876 16.00 4.0 160
2009/05/11 15 57.63 -05 31.8 3.897 4.874 15.95 3.4 163
2009/05/16 15 54.97 -05 26.9 3.887 4.871 15.92 3.0 165
2009/05/21 15 52.27 -05 23.4 3.884 4.869 15.92 3.0 165
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3317 Paris H: 8.30 Min: 15.07 Date: 2009/05/21
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DATE RA(2000) DC(2000) E.D. S.D. Mag PA E
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2009/05/01 17 57.75 +04 46.1 3.959 4.618 15.27 10.2 126
2009/05/06 17 56.68 +04 59.8 3.907 4.615 15.21 9.7 130
2009/05/11 17 55.29 +05 11.7 3.859 4.613 15.16 9.1 134
2009/05/16 17 53.59 +05 21.5 3.817 4.611 15.11 8.6 137
2009/05/21 17 51.61 +05 28.9 3.779 4.609 15.07 8.0 141
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3451 Mentor H: 8.10 Min: 15.13 Date: 2009/05/21
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DATE RA(2000) DC(2000) E.D. S.D. Mag PA E
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2009/05/01 18 19.16 +04 57.9 4.242 4.832 15.32 10.3 121
2009/05/06 18 18.48 +05 22.5 4.187 4.830 15.27 9.9 125
2009/05/11 18 17.48 +05 45.7 4.135 4.828 15.23 9.4 128
2009/05/16 18 16.17 +06 07.3 4.089 4.826 15.18 8.9 132
2009/05/21 18 14.58 +06 26.9 4.047 4.825 15.13 8.4 136
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7352 1994 CO H: 9.00 Min: 15.71 Date: 2009/05/21
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DATE RA(2000) DC(2000) E.D. S.D. Mag PA E
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2009/05/01 16 07.14 -11 05.2 4.031 4.972 15.91 4.6 157
2009/05/06 16 04.81 -10 56.1 4.005 4.972 15.84 3.7 161
2009/05/11 16 02.34 -10 47.6 3.986 4.971 15.78 2.9 166
2009/05/16 15 59.76 -10 39.7 3.974 4.971 15.73 2.2 169
2009/05/21 15 57.12 -10 32.6 3.970 4.970 15.71 2.0 170
*************************************************************************
Brian D. Warner
Palmer Divide Observatory (716)
17995 Bakers Farm Rd.
Colorado Springs, CO 80908