The Cycle 25 Announcement webpage
provides links to information and documentation that will be useful to you while preparing your proposals. This page will also provide any late-breaking updates on the Phase I process, and answers to frequently asked questions.
The Phase I Proposal Roadmap
is a high level step-by-step guide to writing a Phase I Proposal. Links to the appropriate sections of various documents (Call for Proposals, Primer, etc.) are given for each step.
The HST Primer
provides a basic introduction to the technical aspects of HST and its instruments, and explains how to request the appropriate number of orbits in a Phase I proposal.
The HST Data Archive is part of the (Mikulski Archive for Space Telescopes
(MAST). The HST Data Archive contains all the data taken by HST. Completed HST observations from both General Observer (GO) and Guaranteed Time Observer (GTO) programs are available to the community upon the expiration of their proprietary periods. Observations taken by Large, Calibration, Treasury (see Section 3.2 Section 3.2 and subsections therein
), and Large GO Pure Parallel programs (see Section 4.2.2
) generally carry no proprietary period.
The HST Archive Page
provides links to information about getting started, search and retrieval, documentation, etc. (see also the introductory description in Section 7.2 of the HST Primer
). You can search for HST data using either of two main search pages: the dedicated HST search page or the Data Discovery Portal.
The Canadian Astronomy Data Centre
(CADC) and the European Space Agency Centre
(ESAC) maintain copies of the HST science data, and are the preferred sources for Canadian and European astronomers.
The Hubble Legacy Archive (HLA) i
s a project designed to enhance science from HST data by augmenting the HST Data Archive and by providing advanced browsing capabilities. Features of the HLA include a preview viewer, an interactive image display, a footprint service, individual and combined and mosaicked images, improved astrometric positions, object catalogs, and selected grism extractions. The HLA is a joint project of the Space Telescope Science Institute, the European Coordinating Facility (ST-ECF), and the Canadian Astronomy Data Centre. It offers access to high-level HST products including composite images and interactive tools for previewing data products. Section 7.3 of the HST Primer
contains more detailed information about the HLA.
The HLA also produces source lists for tens of thousands of HST images. The Hubble Source Catalog (HSC)
combines these visit-based WFC3, ACS, and WFPC2 source lists from the HLA into a master catalog
with roughly 300 million sources. Searches that would require months or years to perform in the past can be completed in a matter of seconds using the HSC. Version 1 of the HSC was released in February 2015, and Version 2 was released in the Fall 2016. The HSC is an invaluable resource for exploring a wide range of new archival proposals, a few potential examples of which are also included in Section 7.4 of the HST Primer
Cycle 25 proposers will be able to mine the HST Spectroscopic Legacy Archive
for high-level data products intended to accelerate the scientific use of existing spectroscopic data. This archive will contain “science grade” co-added spectra of all usable public data, combining exposures for each target from across visits, programs, and cycles. This data will be organized into “smart archives” by target type (such as “hot stars” and “white dwarfs”) and by scientific purpose (“IGM absorption sources”) so that samples can be readily constructed and downloaded without manual interaction with MAST. The first generation of these products for the FUV modes of COS is available online via MAST. We encourage the development and submission of Archival Programs based on these new products.
See Section 5.1 of the HST Primer
for more information on Bright Object Constraints.