PRIOR INFO
Skiff Summary
Asteroid Inc Ecc S-M q RA Dec Solar Phase R Gal Ecl Daily Motn
Axis El Ang Lat Lat RA Dec
d AU AU h d d d mag d d s '
5011 Ptah 7.4 0.500 1.635 0.817 8.730 17.03 99.9 64.3 16.60 32.3 -1.1 477. -56.4
Orbital Elements:
5011 Ptah |2009 06 18.000|0.500429 |1.635458| 7.4069| 10.8277 |105.7005 | 2000| 55.6268 |17.1 | 0.15| 0.00
JPL Ephemeris
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Date__(UT)__HR:MN R.A._(ICRF/J2000.0)_DEC APmag S-O-T /r S-T-O ObsEcLon ObsEcLat
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2009-Apr-18 00:00 * 08 35 45.93 +17 57 56.2 16.99 98.7599 /T 65.4633 126.8553358 -0.6470620
2009-Apr-19 00:00 * 08 43 50.93 +17 01 26.1 17.00 99.8857 /T 64.2617 128.9596591 -1.0652576
2009-Apr-20 00:00 * 08 51 39.69 +16 05 17.8 17.01 100.9611 /T 63.0979 131.0138412 -1.4694542
2009-Apr-21 00:00 * 08 59 12.45 +15 09 43.4 17.03 101.9846 /T 61.9736 133.0165001 -1.8589071
2009-Apr-22 00:00 * 09 06 29.54 +14 14 53.4 17.05 102.9553 /T 60.8900 134.9667274 -2.2330758
2009-Apr-23 00:00 * 09 13 31.35 +13 20 56.7 17.07 103.8728 /T 59.8479 136.8640490 -2.5916079
2009-Apr-24 00:00 *m 09 20 18.36 +12 28 00.6 17.10 104.7369 /T 58.8475 138.7083791 -2.9343213
2009-Apr-25 00:00 *m 09 26 51.06 +11 36 11.0 17.13 105.5479 /T 57.8889 140.4999726 -3.2611835
2009-Apr-26 00:00 *m 09 33 09.97 +10 45 32.7 17.16 106.3066 /T 56.9717 142.2393745 -3.5722920
2009-Apr-27 00:00 *m 09 39 15.65 +09 56 09.1 17.19 107.0137 /T 56.0953 143.9273719 -3.8678542
2009-Apr-28 00:00 *m 09 45 08.64 +09 08 02.7 17.23 107.6705 /T 55.2588 145.5649491 -4.1481682
2009-Apr-29 00:00 *m 09 50 49.50 +08 21 15.1 17.26 108.2781 /T 54.4613 147.1532497 -4.4136054
2009-Apr-30 00:00 *m 09 56 18.77 +07 35 47.1 17.30 108.8379 /T 53.7016 148.6935454 -4.6645948
2009-May-01 00:00 *m 10 01 37.00 +06 51 39.0 17.34 109.3514 /T 52.9784 150.1872099 -4.9016086
2009-May-02 00:00 *m 10 06 44.70 +06 08 50.3 17.38 109.8203 /T 52.2905 151.6356963 -5.1251505
2009-May-03 00:00 *m 10 11 42.39 +05 27 20.2 17.42 110.2460 /T 51.6365 153.0405172 -5.3357447
2009-May-04 00:00 *m 10 16 30.57 +04 47 07.4 17.47 110.6302 /T 51.0150 154.4032252 -5.5339274
2009-May-05 00:00 *m 10 21 09.70 +04 08 10.3 17.51 110.9745 /T 50.4245 155.7253964 -5.7202396
2009-May-06 00:00 *m 10 25 40.25 +03 30 27.2 17.55 111.2807 /T 49.8635 157.0086143 -5.8952207
2009-May-07 00:00 * 10 30 02.66 +02 53 56.1 17.60 111.5502 /T 49.3308 158.2544566 -6.0594038
2009-May-08 00:00 * 10 34 17.34 +02 18 34.7 17.65 111.7846 /T 48.8248 159.4644842 -6.2133121
2009-May-09 00:00 * 10 38 24.70 +01 44 20.9 17.69 111.9857 /T 48.3442 160.6402323 -6.3574554
2009-May-10 00:00 * 10 42 25.13 +01 11 12.2 17.74 112.1547 /T 47.8876 161.7832027 -6.4923284
2009-May-11 00:00 * 10 46 18.99 +00 39 06.4 17.79 112.2933 /T 47.4537 162.8948595 -6.6184088
2009-May-12 00:00 * 10 50 06.63 +00 08 00.9 17.83 112.4028 /T 47.0413 163.9766244 -6.7361561
2009-May-13 00:00 * 10 53 48.38 -00 22 06.4 17.88 112.4847 /T 46.6490 165.0298743 -6.8460112
2009-May-14 00:00 * 10 57 24.55 -00 51 18.1 17.93 112.5402 /T 46.2758 166.0559392 -6.9483955
2009-May-15 00:00 * 11 00 55.45 -01 19 36.4 17.98 112.5707 /T 45.9204 167.0561009 -7.0437113
2009-May-16 00:00 * 11 04 21.36 -01 47 03.7 18.03 112.5774 /T 45.5819 168.0315929 -7.1323419
2009-May-17 00:00 * 11 07 42.53 -02 13 42.0 18.07 112.5614 /T 45.2591 168.9835997 -7.2146515
2009-May-18 00:00 * 11 10 59.23 -02 39 33.7 18.12 112.5239 /T 44.9511 169.9132580 -7.2909862
FOLDED ROTATION LIGHT CURVE
This RLC is going to be interesting to watch come together.
OBSERVATIONS
2009.04.20
2009.04.19
Other nightly LCs are not presented since they are brief and merely show slopes.
DISCUSSION
Average r' = 16.44, so assuming R = r' - 0.20 mag (my estimate), then R = 16.24. If we assume V-R = 0.4 +- 0.1, then V = R + 0.4 = 16.64 +- 0.1. This compares with the ephemeris prediciton of V = 17.0, so this asteroid appears to be ~ 0.36 +/ 0.1 magnitude brighter than expected, which might be a significant difference (allowing for the unknown V-R color).