Assigned ID: 132 ----- Attempting Submission 1 (Thu Feb 24 06:01:39 GMT 2011) ----- HST Phase I Proposal 132 (phase1-AR.apt) successfully submitted. ----- Attempting Submission 2 (Fri Feb 25 18:50:28 GMT 2011) ----- HST Phase I Proposal 132 (phase1-AR.apt) successfully submitted. ----- Attempting Submission 3 (Fri Feb 25 21:36:05 GMT 2011) ----- HST Phase I Proposal 132 (phase1-AR.apt) successfully submitted. ----- Attempting Submission 4 (Sat Feb 26 01:13:01 GMT 2011) ----- HST Phase I Proposal 132 (phase1-AR.apt) successfully submitted. ----- Attempting Submission 5 (Sat Feb 26 03:02:11 GMT 2011) ----- HST Phase I Proposal 132 (phase1-AR.apt) successfully submitted. ----- Attempting Submission 6 (Sat Feb 26 03:05:33 GMT 2011) ----- HST Phase I Proposal 132 (phase1-AR.apt) successfully submitted. ----- Attempting Submission 7 (Sat Feb 26 19:59:46 GMT 2011) ----- We propose to continue our successful archival program by harvesting TNOs (Trans-neptunian Objects) from WFC3 data. We will discover ~100 new TNOs down to 10 km. This will allow us to measure the magnitude distribution for the dynamically hot and cold subclasses independently, probing their potentially different evolutionary histories. We will measure the V-NIR colors for ~30 faint TNOs. This will allow us to test whether TNO surface colors are collisionally-derived (if all small TNOs have neutral/blue colors) or compositionally intrinsic (a range of colors for these smallest TNOs). This proposed work builds on our previous archive program in which we have discovered 45 faint TNOs to date in ACS/WFC data. These experiments can only be carried out with archival HST data.

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