HST Call for Proposals and HST Primer for Cycle 24
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Hubble Space Telescope Primer for Cycle 24 > Chapter 1: Introduction > 1.2 What’s New This Cycle

1.2
The following instruments will be offered in Cycle 24: two cameras on ACS (ACS/WFC and ACS/SBC), COS, FGS, STIS, and WFC3.
Due to heavy demand and the need for scheduling flexibility in Cycle 24, Large GO programs requesting 75 orbits or more must use the shorter orbital visibility values from Table 6.1; this will be enforced for such programs approved for Phase II.
COS/FUV
COS Lifetime Position. In February 2015 COS FUV spectra were moved from the second COS Lifetime Position (LP2) to the third (LP3) in order to alleviate the continuing effects of gain sag. The typical spectral resolution (λ/Δλ) has declined by about 5% for observations with the primary science aperture (PSA). Changes in the COS extraction and calibration pipeline have improved the calibration of point-source observations. COS/FUV observations at LP3 targeting extended objects or using the Bright Object Aperture (BOA) are more complex. In these cases the standard pipeline calibration will not always produce the flux accuracy achieved for point sources observed with the PSA, and it will be the responsibility of the user to evaluate the adequacy of the spectral extraction and, if necessary, undertake any customized extractions. See Chapter 3 of the COS Data Handbook for more information.
STIS/CCD
For Cycle 24 STIS/CCD imaging observations. Observations with the new BAR5 coronagraphic position will be supported. This is intended to provide high contrast at inner working angles as small as 0.25”. See the STIS coronagraphy webpage and the articles in the November 2015 and March 2014 STIS STAN for additional details, and watch for additional updates on the performance of this new position in future STIS STAN articles.
WFC3
New Supported Sample Sequence for WFC3/IR. The sample sequence SPARS5, intermediate between RAPID and SPARS10, is intended to allow the efficiency and uninterrupted time series of SPARS10 and yet be short enough in cadence to better isolate an exoplanet-host star from a nearby stellar companion in spatially-scanned observations using an IR grism. See the article in WFC3 STAN Issue 20.
New Supported WFC3/UVIS Apertures. The apertures UVIS2-C512C-CTE and UVIS2-C1K1C-CTE enable observers to automatically place a small target near a readout amplifier to reduce CTE losses while still reading out all of the detector. See the article in WFC3 STAN Issue 20.
Archive changes credentials to Single Sign-On: As of April 2015, the Archive’s account management system has been replaced by the STScI Single Sign-On (SSO) System. Most users will need to register for a new account. As an Archive user, the only difference you should see (apart from a different registration process) is that instead of a username, you will login with your email address.  You can check whether or not you currently have an SSO account here:
https://archive.stsci.edu/registration/index.html.
It is not necessary to register for an account to search the Archive catalogs or retrieve public data. However, to retrieve proprietary data, such as recently archived HST data, an SSO account is required. When retrieving proprietary HST data, the Retrieval Options page will ask you to enter your SSO email and password. This will be used to verify that you are authorized to retrieve the data. (You can also use your SSO account to retrieve public HST data, instead of doing so anonymously, if you wish.)

Hubble Space Telescope Primer for Cycle 24 > Chapter 1: Introduction > 1.2 What’s New This Cycle

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