The list of Investigators does not match the STScI records for this program. The number of orbits used exceeds the number allocated 0 ----- Attempting Submission 1 (Thu Jan 15 19:42:01 GMT 2026) ----- The PI/Co-I list should match GO 17904, the other Rocky Worlds program. The orbit allocation was an initial estimate, which explains the discrepancy. Rocky Worlds DDT: HST Observations of LTT 1445A 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 LT 1445A, obtaining flare monitoring in G130M/1222 and adding STIS coverage of G230L and G750L to augment archival data of the star in GO 16701 and GO 16722 that include COS/G130M, STIS/G140M, COS/G160M, STIS/G230L, COS/G230L, and STIS/G430L. NOTE: LTT 1445B was 5.09" to the west and 5.10" to the East in 2016 (Gaia DR3) just outside the 7" bright object radius, consisting of magnetically active M dwarfs of later type. These companions are not safe if they fall in the STIS long slit, and thus an ORIENT constraint is placed on the STIS Visit 4. In 2022 using WFC3/IR imaging, the closest star was separated by 7.06", implying that by 2026 it will still be ~7" away. HST observations of LTT 1445A. 12 orbits of flare monitoring using G130M/1222. We obtain NUV/Vis low resolution spectroscopy with STIS G230L 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 the LTT 1445A MUSCLES SED with constant resolution, and a custom HSLA combination of archival spectra for SNR calculations in the above modes. These observations mimic characterization of other M dwarfs from previous programs. LTT1445BC was checked in case it flared during NUV STIS G230L since the 52x0.2 slit could intersect the BC component. It was determined to be unsafe so ORIENT constraints are present, following https://hst-docs.stsci.edu/stisihb/chapter-11-data-taking/11-4-fixing-orientation-on-the-sky, I calculated a +/-20 degree avoidance window assuming a PA of TBD 0 false false SUPPORTED EXT-STAR EMISSION LINE STAR EXTRA-SOLAR PLANETARY SYSTEM M V-IV NO Gaia Coordinates used 11/6/2025 LTT-1445A HD-260665 J2000 /Users/debes/COS_WORK/RockyWorlds/LTT1445/OP-cache/LTT1445A_PhaseII_v2-v01.xml The scheduling data was generated by CASM 34.0. CASM was run in Phase II mode. Flare monitoring of LTT 1445A (Tic-Visit :proposal-id 17903 :visit-id "01" :proposal-version -1 :trans-version "20250624" :date "04-Dec-2025 10:38:10.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 4 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 922176 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17903 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17903 :visit-id "01" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2486 :al-overhead-at-end 0 :internal-dur-at-end 2403 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2866 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17903 :visit-id "01" :orbit-number 2 :pcs-time 380 :si-vis-utilization 2486 :al-overhead-at-end 0 :internal-dur-at-end 2403 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2866 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17903 :visit-id "01" :orbit-number 3 :pcs-time 380 :si-vis-utilization 2486 :al-overhead-at-end 0 :internal-dur-at-end 2403 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2866 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17903 :visit-id "01" :orbit-number 4 :pcs-time 380 :si-vis-utilization 2486 :al-overhead-at-end 0 :internal-dur-at-end 614 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2866 :pcs-gap 0 ) true 4 0 Copied from 16722. Flaring clearance available in CS report for 16722 /Users/debes/COS_WORK/RockyWorlds/LTT1445/OP-cache/LTT1445A_PhaseII_v2-v02.xml The scheduling data was generated by CASM 34.0. CASM was run in Phase II mode. Flare monitoring of LTT 1445A (Tic-Visit :proposal-id 17903 :visit-id "02" :proposal-version -1 :trans-version "20250929" :date "07-Jan-2026 16:40:14.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 4 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 922176 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17903 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17903 :visit-id "02" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2486 :al-overhead-at-end 0 :internal-dur-at-end 2403 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2866 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17903 :visit-id "02" :orbit-number 2 :pcs-time 380 :si-vis-utilization 2486 :al-overhead-at-end 0 :internal-dur-at-end 2403 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2866 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17903 :visit-id "02" :orbit-number 3 :pcs-time 380 :si-vis-utilization 2486 :al-overhead-at-end 0 :internal-dur-at-end 2403 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2866 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17903 :visit-id "02" :orbit-number 4 :pcs-time 380 :si-vis-utilization 2486 :al-overhead-at-end 0 :internal-dur-at-end 614 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2866 :pcs-gap 0 ) true 4 0 Copied from 16722. Flaring clearance available in CS report for 16722 /Users/debes/COS_WORK/RockyWorlds/LTT1445/OP-cache/LTT1445A_PhaseII_v2-v03.xml The scheduling data was generated by CASM 34.0. CASM was run in Phase II mode. Flare monitoring of LTT 1445A (Tic-Visit :proposal-id 17903 :visit-id "03" :proposal-version -1 :trans-version "20250929" :date "07-Jan-2026 16:40:15.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 4 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 922176 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17903 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17903 :visit-id "03" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2486 :al-overhead-at-end 0 :internal-dur-at-end 2403 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2866 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17903 :visit-id "03" :orbit-number 2 :pcs-time 380 :si-vis-utilization 2486 :al-overhead-at-end 0 :internal-dur-at-end 2403 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2866 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17903 :visit-id "03" :orbit-number 3 :pcs-time 380 :si-vis-utilization 2486 :al-overhead-at-end 0 :internal-dur-at-end 2403 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2866 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17903 :visit-id "03" :orbit-number 4 :pcs-time 380 :si-vis-utilization 2486 :al-overhead-at-end 0 :internal-dur-at-end 614 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2866 :pcs-gap 0 ) true 4 0 Copied from 16722. Flaring clearance available in CS report for 16722 The scheduling data was generated by CASM 34.0. CASM was run in Phase II mode. /Users/debes/COS_WORK/RockyWorlds/LTT1445/OP-cache/LTT1445A_PhaseII_v2-v04.xml UV/Vis characterization (Tic-Visit :proposal-id 17903 :visit-id "04" :proposal-version -1 :trans-version "20250929" :date "08-Jan-2026 12:17:03.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 527312 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17903 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17903 :visit-id "04" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2534 :al-overhead-at-end 72 :internal-dur-at-end 637 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2915 :pcs-gap 0 ) true 1 0