We propose to observe interstellar absorption toward the O V 9 star HD 204827 for 30 orbits in order to make a comprehensive survey of the prototypical translucent molecular cloud that lies in the direction of that star. The high throughput of COS at medium resolution will make it possible to overcome the effects of the extinction at the shorter UV wavelengths while STIS will be used to cover important features at longer wavelengths. These data will enable us to: test and refine chemical models; infer elemental depletions; estimate the density and radiation field intensity (by measuring the ionization balance and molecular excitation); and search for new molecules, including complex organics. We will use a combination of medium-resolution STIS and COS observations, and also a wide variety of ancillary instruments in space (the Spitzer Space Telescope) and on the ground (optical and infrared spectrographs, radio spectrometers, and laboratory spectroscopic measurements). The result of this program, including the ancillary observations, will be the most complete analysis of any isolated translucent interstellar cloud.

30 Orbits on reddened point source target to study the cold ISM. We will observe HD204827, a spectroscopic binary, in 3 "sessions" at 3 different phases in its orbit. We are interested in ISM absorption lines that do NOT change with orbit phase. Lines that DO change with phase can be safely assumed to be stellar lines. The "50-100 days later" time contraints on visits 04 & 07 are necessary to acquire spectra at different phases. Each session will involve 3 visits of 3, 3, & 4 orbits each. The visits within each session need to be within 2 days of each other to be close enough to the same phase of the binary orbit, hence the time contraints of visits 02 & 03 after 01, 05 & 06 after 04 and 08 & 09 after 07. The two 3-orbit visits will use COS. The 4-orbit visit will use STIS. For all targets the STIS and COS online ETCs were run using Low resolution IUE and FOS data. ETC IDs are included in the comment sections of the exposures. The special requirement of CVZ is requested as high signal to noise ratios are critical for measuring weak absorption lines. ISM AND CIRCUMSTELLAR MATTER 12 false 0.0 0.0 false false false false SUPPORTED EXT-STAR MAIN SEQUENCE O This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 COS/FUV Spectroscopic No No G130M 1309 COS/FUV Spectroscopic No No G160M 1611 STIS/NUV-MAMA Spectroscopic No No E230M 1978 STIS/NUV-MAMA Spectroscopic No No E230M 2707 COS/FUV Spectroscopic No No G130M 1309 COS/FUV Spectroscopic No No G160M 1611 STIS/NUV-MAMA Spectroscopic No No E230M 1978 STIS/NUV-MAMA Spectroscopic No No E230M 2707 COS/FUV Spectroscopic No No G130M 1309 COS/FUV Spectroscopic No No G160M 1611 STIS/NUV-MAMA Spectroscopic No No E230M 1978 STIS/NUV-MAMA Spectroscopic No No E230M 2707 Timing link suitability includes constraints ([02 After 01 by at most 2.0 days] [03 After 01 by at most 2.0 days]) The scheduling data was generated by CASM 19.3. CASM was run in Phase II mode. Uses multiple central wavelengths but only one FP-POS setting. A different FP-POS setting is used in the next COS visit in this session and then a different pair of settings is used in each of the other sessions. (Tic-Visit :proposal-id 12542 :visit-id "01" :proposal-version -1 :trans-version "20110509" :date "06-Jul-2011 18:00:24.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 1217824 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12542 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :cvz T :proposal-id 12542 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 16562 :al-overhead-at-end 0 :internal-dur-at-end 352 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 0 :low-sky "N" :pcs-visibility 0 :pcs-gap 0 ) true 3 0 File: final_HD204827.dat ETC ID:COS.sa.186459 File: final_HD204827.dat ETC ID:COS.sa.186459 File: final_HD204827.dat ETC ID: COS.sp.186429 ETC Buffer time 2000 File: final_HD204827.dat ETC ID: COS.sp.186429 ETC Buffer time 2000 File: final_HD204827.dat ETC ID: COS.sp.186429 ETC Buffer time 2000 File: final_HD204827.dat ETC ID: COS.sp.186429 ETC Buffer time 2000 File: final_HD204827.dat ETC ID: COS.sp.186429 ETC Buffer time 2000 Timing link suitability includes constraints ([03 After 01 by at most 2.0 days] [04 After 03 by 50.0 to 100.0 days]) The scheduling data was generated by CASM 19.3. CASM was run in Phase II mode. Uses multiple central wavelengths but only one FP-POS setting. For G130M, a different FP-POS setting was used in the previous COS visit in this session and then a different pair of settings is used in each of the other sessions. For G160M, we use a different FP-POS in the corresponding visits in the other sessions. G160M exposures do not include the 1623 central wavelength because that puts some lines of interest near 1613A in the central gap. (Tic-Visit :proposal-id 12542 :visit-id "03" :proposal-version -1 :trans-version "20110509" :date "06-Jul-2011 18:10:08.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 1557088 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12542 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :cvz T :proposal-id 12542 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 16542 :al-overhead-at-end 0 :internal-dur-at-end 371 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 0 :low-sky "N" :pcs-visibility 0 :pcs-gap 0 ) true 3 0 File: final_HD204827.dat ETC ID:COS.sa.186459 File: final_HD204827.dat ETC ID:COS.sa.186459 File: final_HD204827.dat ETC ID: COS.sp.186430 ETC Buffer Time 2000 File: final_HD204827.dat ETC ID: COS.sp.186430 ETC Buffer Time 2000 File: final_HD204827.dat ETC ID: COS.sp.186430 ETC Buffer Time 2000 File: final_HD204827.dat ETC ID: COS.sp.186430 ETC Buffer Time 2000 File: final_HD204827.dat ETC ID: COS.sp.186430 ETC Buffer Time 2000 File: final_HD204827.dat ETC ID: COS.sp.186433 ETC Buffer Time 872 File: final_HD204827.dat ETC ID: COS.sp.186433 ETC Buffer Time 872 File: final_HD204827.dat ETC ID: COS.sp.186433 ETC Buffer Time 872 File: final_HD204827.dat ETC ID: COS.sp.186433 ETC Buffer Time 872 Timing link suitability includes constraints ([02 After 01 by at most 2.0 days]) The scheduling data was generated by CASM 19.3. CASM was run in Phase II mode. BOT was run using the 0.2x0.2 aperture because BOT doesn't support the 0.2x0.2FP* apertures. This was done on 2 representative exposures (one 1978, one 2707) and then changed back to 0.2x0.2FP*. (Tic-Visit :proposal-id 12542 :visit-id "02" :proposal-version -1 :trans-version "20110509" :date "07-Jul-2011 15:28:06.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 4 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 818192 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12542 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :cvz T :proposal-id 12542 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 22214 :al-overhead-at-end 0 :internal-dur-at-end 452 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 0 :low-sky "N" :pcs-visibility 0 :pcs-gap 0 ) true 4 0 file: final_HD204827.dat ETC ID: STIS.ta.195661 file: final_HD204827.dat ETC ID: STIS.sp.186476 BOT was run by changing Aperture to 0.2X0.2 and then changing it back. file: final_HD204827.dat ETC ID: STIS.sp.186476 BOT was run by changing Aperture to 0.2X0.2 and then changing it back. file: final_HD204827.dat ETC ID: STIS.sp.186476 BOT was run by changing Aperture to 0.2X0.2 and then changing it back. file: final_HD204827.dat ETC ID: STIS.sp.186476 BOT was run by changing Aperture to 0.2X0.2 and then changing it back. file: final_HD204827.dat ETC ID: STIS.sp.186476 BOT was run by changing Aperture to 0.2X0.2 and then changing it back. file: final_HD204827.dat ETC ID: STIS.sp.186480 BOT was run by changing Aperture to 0.2X0.2 and then changing it back. file: final_HD204827.dat ETC ID: STIS.sp.186480 BOT was run by changing Aperture to 0.2X0.2 and then changing it back. file: final_HD204827.dat ETC ID: STIS.sp.186480 BOT was run by changing Aperture to 0.2X0.2 and then changing it back. file: final_HD204827.dat ETC ID: STIS.sp.186480 BOT was run by changing Aperture to 0.2X0.2 and then changing it back. file: final_HD204827.dat ETC ID: STIS.sp.186480 BOT was run by changing Aperture to 0.2X0.2 and then changing it back. Timing link suitability includes constraints ([04 After 03 by 50.0 to 100.0 days] [05 After 04 by at most 2.0 days] [06 After 04 by at most 2.0 days]) The scheduling data was generated by CASM 19.3. CASM was run in Phase II mode. Uses multiple central wavelengths but only one FP-POS setting. A different FP-POS setting is used in the next COS visit in this session and then a different pair of settings is used in each of the other sessions. (Tic-Visit :proposal-id 12542 :visit-id "04" :proposal-version -1 :trans-version "20110509" :date "06-Jul-2011 18:40:38.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 1217824 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12542 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :cvz T :proposal-id 12542 :visit-id "04" :orbit-number 1 :pcs-time 333 :si-vis-utilization 16562 :al-overhead-at-end 0 :internal-dur-at-end 352 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 0 :low-sky "N" :pcs-visibility 0 :pcs-gap 0 ) true 3 0 File: final_HD204827.dat ETC ID:COS.sa.186459 File: final_HD204827.dat ETC ID:COS.sa.186459 File: final_HD204827.dat ETC ID: COS.sp.186429 ETC Buffer time 2000 File: final_HD204827.dat ETC ID: COS.sp.186429 ETC Buffer time 2000 File: final_HD204827.dat ETC ID: COS.sp.186429 ETC Buffer time 2000 File: final_HD204827.dat ETC ID: COS.sp.186429 ETC Buffer time 2000 File: final_HD204827.dat ETC ID: COS.sp.186429 ETC Buffer time 2000 Timing link suitability includes constraints ([05 After 04 by at most 2.0 days]) The scheduling data was generated by CASM 19.3. CASM was run in Phase II mode. Uses multiple central wavelengths but only one FP-POS setting. For G130M, a different FP-POS setting was used in the previous COS visit in this session and then a different pair of settings is used in each of the other sessions. For G160M, we use a different FP-POS in the corresponding visits in the other sessions. G160M exposures do not include the 1623 central wavelength because that puts some lines of interest near 1613A in the central gap. (Tic-Visit :proposal-id 12542 :visit-id "05" :proposal-version -1 :trans-version "20110509" :date "06-Jul-2011 18:40:44.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 1557088 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12542 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Orbit :cvz T :proposal-id 12542 :visit-id "05" :orbit-number 1 :pcs-time 333 :si-vis-utilization 16472 :al-overhead-at-end 0 :internal-dur-at-end 371 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 0 :low-sky "N" :pcs-visibility 0 :pcs-gap 0 ) true 3 0 File: final_HD204827.dat ETC ID:COS.sa.186459 File: final_HD204827.dat ETC ID:COS.sa.186459 File: final_HD204827.dat ETC ID: COS.sp.186430 ETC Buffer Time 2000 File: final_HD204827.dat ETC ID: COS.sp.186430 ETC Buffer Time 2000 File: final_HD204827.dat ETC ID: COS.sp.186430 ETC Buffer Time 2000 File: final_HD204827.dat ETC ID: COS.sp.186430 ETC Buffer Time 2000 File: final_HD204827.dat ETC ID: COS.sp.186430 ETC Buffer Time 2000 File: final_HD204827.dat ETC ID: COS.sp.186433 ETC Buffer Time 872 File: final_HD204827.dat ETC ID: COS.sp.186433 ETC Buffer Time 872 File: final_HD204827.dat ETC ID: COS.sp.186433 ETC Buffer Time 872 File: final_HD204827.dat ETC ID: COS.sp.186433 ETC Buffer Time 872 Timing link suitability includes constraints ([06 After 04 by at most 2.0 days] [07 After 06 by 50.0 to 100.0 days]) The scheduling data was generated by CASM 19.3. CASM was run in Phase II mode. BOT was run using the 0.2x0.2 aperture because BOT doesn't support the 0.2x0.2FP* apertures. This was done on 2 representative exposures (one 1978, one 2707) in Visit 02 and then changed back to 0.2x0.2FP*. (Tic-Visit :proposal-id 12542 :visit-id "06" :proposal-version -1 :trans-version "20110509" :date "07-Jul-2011 14:43:28.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 4 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 818192 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12542 :visit-id "06" :obset-id "06" :pcs-mode "FGS" ) (Tic-Orbit :cvz T :proposal-id 12542 :visit-id "06" :orbit-number 1 :pcs-time 333 :si-vis-utilization 22214 :al-overhead-at-end 0 :internal-dur-at-end 452 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 0 :low-sky "N" :pcs-visibility 0 :pcs-gap 0 ) true 4 0 file: final_HD204827.dat ETC ID: STIS.ta.195661 file: final_HD204827.dat ETC ID: STIS.sp.186476 file: final_HD204827.dat ETC ID: STIS.sp.186476 file: final_HD204827.dat ETC ID: STIS.sp.186476 file: final_HD204827.dat ETC ID: STIS.sp.186476 file: final_HD204827.dat ETC ID: STIS.sp.186476 file: final_HD204827.dat ETC ID: STIS.sp.186480 file: final_HD204827.dat ETC ID: STIS.sp.186480 file: final_HD204827.dat ETC ID: STIS.sp.186480 file: final_HD204827.dat ETC ID: STIS.sp.186480 file: final_HD204827.dat ETC ID: STIS.sp.186480 Timing link suitability includes constraints ([07 After 06 by 50.0 to 100.0 days] [08 After 07 by at most 2.0 days] [09 After 07 by at most 2.0 days]) The scheduling data was generated by CASM 19.3. CASM was run in Phase II mode. Uses multiple central wavelengths but only one FP-POS setting. A different FP-POS setting is used in the next COS visit in this session and then a different pair of settings is used in each of the other sessions. (Tic-Visit :proposal-id 12542 :visit-id "07" :proposal-version -1 :trans-version "20110509" :date "06-Jul-2011 19:05:09.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 1217824 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12542 :visit-id "07" :obset-id "07" :pcs-mode "FGS" ) (Tic-Orbit :cvz T :proposal-id 12542 :visit-id "07" :orbit-number 1 :pcs-time 333 :si-vis-utilization 16492 :al-overhead-at-end 0 :internal-dur-at-end 352 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 0 :low-sky "N" :pcs-visibility 0 :pcs-gap 0 ) true 3 0 File: final_HD204827.dat ETC ID:COS.sa.186459 File: final_HD204827.dat ETC ID:COS.sa.186459 File: final_HD204827.dat ETC ID: COS.sp.186429 ETC Buffer time 2000 File: final_HD204827.dat ETC ID: COS.sp.186429 ETC Buffer time 2000 File: final_HD204827.dat ETC ID: COS.sp.186429 ETC Buffer time 2000 File: final_HD204827.dat ETC ID: COS.sp.186429 ETC Buffer time 2000 File: final_HD204827.dat ETC ID: COS.sp.186429 ETC Buffer time 2000 Timing link suitability includes constraints ([08 After 07 by at most 2.0 days]) The scheduling data was generated by CASM 19.3. CASM was run in Phase II mode. Uses multiple central wavelengths but only one FP-POS setting. For G130M, a different FP-POS setting was used in the previous COS visit in this session and then a different pair of settings is used in each of the other sessions. For G160M, we use a different FP-POS in the corresponding visits in the other sessions. G160M exposures do not include the 1623 central wavelength because that puts some lines of interest near 1613A in the central gap. (Tic-Visit :proposal-id 12542 :visit-id "08" :proposal-version -1 :trans-version "20110509" :date "06-Jul-2011 19:05:16.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 1557088 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12542 :visit-id "08" :obset-id "08" :pcs-mode "FGS" ) (Tic-Orbit :cvz T :proposal-id 12542 :visit-id "08" :orbit-number 1 :pcs-time 333 :si-vis-utilization 16475 :al-overhead-at-end 0 :internal-dur-at-end 371 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 0 :low-sky "N" :pcs-visibility 0 :pcs-gap 0 ) true 3 0 File: final_HD204827.dat ETC ID:COS.sa.186459 File: final_HD204827.dat ETC ID:COS.sa.186459 File: final_HD204827.dat ETC ID: COS.sp.186430 ETC Buffer Time 2000 File: final_HD204827.dat ETC ID: COS.sp.186430 ETC Buffer Time 2000 File: final_HD204827.dat ETC ID: COS.sp.186430 ETC Buffer Time 2000 File: final_HD204827.dat ETC ID: COS.sp.186430 ETC Buffer Time 2000 File: final_HD204827.dat ETC ID: COS.sp.186430 ETC Buffer Time 2000 File: final_HD204827.dat ETC ID: COS.sp.186433 ETC Buffer Time 872 File: final_HD204827.dat ETC ID: COS.sp.186433 ETC Buffer Time 872 File: final_HD204827.dat ETC ID: COS.sp.186433 ETC Buffer Time 872 File: final_HD204827.dat ETC ID: COS.sp.186433 ETC Buffer Time 872 Timing link suitability includes constraints ([09 After 07 by at most 2.0 days]) The scheduling data was generated by CASM 19.3. CASM was run in Phase II mode. BOT was run using the 0.2x0.2 aperture because BOT doesn't support the 0.2x0.2FP* apertures. This was done on 2 representative exposures (one 1978, one 2707) in Visit 02 and then changed back to 0.2x0.2FP*. (Tic-Visit :proposal-id 12542 :visit-id "09" :proposal-version -1 :trans-version "20110509" :date "07-Jul-2011 14:44:01.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 4 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 818192 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12542 :visit-id "09" :obset-id "09" :pcs-mode "FGS" ) (Tic-Orbit :cvz T :proposal-id 12542 :visit-id "09" :orbit-number 1 :pcs-time 333 :si-vis-utilization 22214 :al-overhead-at-end 0 :internal-dur-at-end 452 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 0 :low-sky "N" :pcs-visibility 0 :pcs-gap 0 ) true 4 0 file: final_HD204827.dat ETC ID: STIS.ta.195661 file: final_HD204827.dat ETC ID: STIS.sp.186476 file: final_HD204827.dat ETC ID: STIS.sp.186476 file: final_HD204827.dat ETC ID: STIS.sp.186476 file: final_HD204827.dat ETC ID: STIS.sp.186476 file: final_HD204827.dat ETC ID: STIS.sp.186476 file: final_HD204827.dat ETC ID: STIS.sp.186480 file: final_HD204827.dat ETC ID: STIS.sp.186480 file: final_HD204827.dat ETC ID: STIS.sp.186480 file: final_HD204827.dat ETC ID: STIS.sp.186480 file: final_HD204827.dat ETC ID: STIS.sp.186480