The list of Investigators does not match the STScI records for this program. The number of orbits used exceeds the number allocated Note: need to revise total orbit allocation to 19 567670836 ----- Attempting Submission 1 (Tue Feb 17 21:50:49 GMT 2026) ----- Co-Is have changed since assignment of program. Orbit allocation needs to be revised by PC Rocky Worlds DDT: HST Observations of LHS 1140 Rocky Worlds is a joint JWST and HST Director's Discretionary Program designed to implement the top recommendations from the Working Group on Strategic Exoplanet Initiatives with HST and JWST. The HST side of the Rocky Worlds DDT focuses on ultraviolet (UV) characterization of the nearby M-dwarf hosts of the rocky planets observed with JWST. We will use COS and STIS to measure the UV to blue-optical spectra of these stars, including UV flare monitoring and measuring the wings of the Ly-alpha profile where appropriate. With these observations we will constrain the high-energy output of these host M dwarfs in the UV, which can be applied to planetary models of atmospheric escape, as well as photochemistry if a planetary atmosphere is present. Complementary observations and analysis to fill in the rest of the M-dwarf panchromatic spectra, from the X-ray to the infrared, are encouraged. Each M-dwarf planet host observed by HST in the Rocky Worlds DDT program has its own Program ID. The observations in this program will focus on LHS 1140. HST observations of LHS 1140. 16 orbits of flare monitoring using G130M/1222. We obtain NUV/Vis low resolution spectroscopy with STIS G230L, G430L, and G750L and the 52x0.2 slit in order to construct an accurate stellar SED and leverage the Mg II 2800 emission lines to tie to archival observations. All UV observations are obtained in time-tag mode to allow for light curves to be generated in the case of a flare or serendipitous transit. For all observations we used previous observations of LHS 1140 with COS and STIS to determine exposure times. These observations mimic characterization of other M dwarfs from previous programs. Note on Target ACQ: We placed a timing constraint on the G130M flare monitoring so that the CIT has time to assess blind pointing accuracy given the high overhead on acquisitions. Subsequent flare monitoring visits may be updated. 6 false false false false false false false SUPPORTED STAR EXTRA-SOLAR PLANETARY SYSTEM M V-IV NO Gaia DR3 coordinates double checked 12/18/2025 Fluxes double checked 02/12/2026 G-268-38 J2000 G =12.653 The scheduling data was generated by CASM 34.0. CASM was run in Phase II mode. 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