----- Submission 1 (Tue Feb 21 23:35:04 GMT 2006) ----- Phase II Proposal 1 (EC98DDT) successfully submitted. ----- Submission 3 (Thu Feb 23 17:48:46 GMT 2006) ----- Phase II Proposal 10781 (EC98DDT) successfully submitted. ----- Submission 4 (Wed Mar 01 14:06:59 GMT 2006) ----- Phase II Proposal 10781 (EC98DDT.apt.xml) successfully submitted. ----- Submission 5 (Wed Mar 01 19:37:54 GMT 2006) ----- Phase II Proposal 10781 (10781) successfully submitted. ----- Submission 6 (Wed Mar 01 19:46:53 GMT 2006) ----- ----- Submission 8 (Thu Mar 16 20:52:03 GMT 2006) ----- Program Coordinator, Alison Vick advised to submit with the error because APT doest not do the moving target calculations for the orbit planner to determine the length of the target visibility. Assigned ID: 739 ----- Submission 1 (Sat Feb 11 01:08:49 GMT 2006) ----- Phase I Proposal 739 (EC98DDT) successfully submitted. Observations of the active Centaur (60558) 2000 EC98 On the next-to-last day of 2005, an amazing discovery was made. A modest member of the population of minor planets was suddenly found to be outbursting. The object, originally classified as an asteroidal body with no visible sign of coma or non-rotational photometric variations, had become a comet. (60558) 2000 EC98 is a Centaur, a class of objects that have long been seen as the precursors to many of the comets in our Solar System. This previously quiescent, fairly well-studied body has now afforded the astronomical community the opportunity to observe the changes that the earliest onset of cometary activity may bring to a planetary surface. It also allows us to test theories as to which physical characteristics may herald the potential for future activity and the existence of primordial substances, like volatiles, within the outer Solar System's asteroidal populations. We are requesting Director's Discretionary Time on the Hubble Space Telescope to observe this rare event with high spatial resolution, while the Centaur is still active, so that we may characterize the changes taking place on the nucleus, the robustness of the activity, and the nature of the dust and gas in the coma. Unlike the surfaces of Jupiter-Family Comets, which have been processed by long periods of activity, and unlike the few other active Centaurs, which were discovered after the onset of their activity, this would be a first and rare opportunity to study changes on a cometary surface soon after it evolved from a likely long period of dormancy into strong outburst.
We request 10 orbits of ACS/WFC observations, consisting of 5 x????????2 orbits with each of 4 filters: F435W, F555W, F625W and FR388N. Because of the 26 hour rotation period of the target (assuming a double-peaked lightcurve), the observations for each filter set are evenly separated by 3 hours in order to obtain well-sampled data over rotational phase. The position of 2000 EC98 is obtained from JPL ephemerides and the exposure estimates are from the ACS imaging ETC to obtain reasonable S/N values, based on Johnson UBVR magnitudes that were recently obtained with the 0.6-m telescope at Table Mountain Observatory. We selected the exposure times to obtain reasonable S/N values in the case of a bare nucleus, while not saturating in the extreme case of a large coma, and adopted CR-SPLIT for easier identification of cosmic-ray events: CR-SPLIT=2 for the F435W, F555W and F625W filters, and CR-SPLIT=4 for the FR388N filter. The FR388N observations are requested for the purpose of detecting CN, which has an emission band at 388.3 nm. 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