Observations of Mars and 2007 WD5

Observations of Mars and 2007 WD5 We are proposing to observe 2007 WD5 prior to its possible impact with Mars. In the event that an impact does occur, we will also observe the asteroid as it approaches Mars, the impact itself, and the aftermath of the impact. HST has unique capabilities to observe this potentially very unusual event.

This DD proposal is set up to observe the asteroid 2007 WD5 shortly before it's close approach to Mars in late January 2007. The first visit, to be scheduled as early in January as windows allow (~Jan 27) will be used to characterize the asteroid by obtaining direct imaging using WFPC2. In the event there is a high probability of a collision, visits on January 30 will be activated. These are intended to detect the impact flash and any observable after effects of the collision. SOLAR SYSTEM 0 false 0.0 false false false false false false SUPPORTED SOLAR SYSTEM ASTEROID NEO TYPE=ASTEROID,A=2.5435673,E=0.6028986,I=2.37274,O=67.48406,W=312.72081,M=2.03815,EQUINOX=J2000,EPOCH=27-OCT-2007:00:00:00 SOLAR SYSTEM PLANET mars STD=MARS WFPC2 Imaging No F606W WFPC2 Imaging No F336W POS-TARG DITHER 0.3535 LINE false false 3 45 WFPC2-LINE 1

false

(Tic-Visit :proposal-id 11497 :visit-id "01" :proposal-version -1 :trans-version "20070709" :date "07-Jan-2008 15:40:40.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "26" :si-bright-earth-limb-angle 20.0 :data-volume 134448 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11497 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11497 :visit-id "01" :orbit-number 1 :pcs-time 355 :si-vis-utilization 669 :al-overhead-at-end 120 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 689.0 :low-sky "N" :pcs-visibility 1044.0 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11497 :visit-id "01" :orbit-number 2 :pcs-time 355 :si-vis-utilization 689 :al-overhead-at-end 120 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 689.0 :low-sky "N" :pcs-visibility 1044.0 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11497 :visit-id "01" :orbit-number 3 :pcs-time 355 :si-vis-utilization 689 :al-overhead-at-end 120 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 689.0 :low-sky "N" :pcs-visibility 1044.0 :pcs-gap 0 ) false 3 0 (Tic-Visit :proposal-id 11497 :visit-id "02" :proposal-version -1 :trans-version "20070709" :date "08-Jan-2008 22:25:55.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "23" :si-bright-earth-limb-angle 20.0 :data-volume 364416 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11497 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11497 :visit-id "02" :orbit-number 1 :pcs-time 355 :si-vis-utilization 631 :al-overhead-at-end 0 :internal-dur-at-end 146 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 671.0 :low-sky "N" :pcs-visibility 1026.0 :pcs-gap 0 ) false 1 0 On hold pending orbit updates for 2007 WD5. (Tic-Visit :proposal-id 11497 :visit-id "02" :proposal-version -1 :trans-version "20070709" :date "08-Jan-2008 22:25:55.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "23" :si-bright-earth-limb-angle 20.0 :data-volume 364416 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11497 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11497 :visit-id "02" :orbit-number 1 :pcs-time 355 :si-vis-utilization 631 :al-overhead-at-end 0 :internal-dur-at-end 146 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 671.0 :low-sky "N" :pcs-visibility 1026.0 :pcs-gap 0 ) false 1 0 On hold pending orbit updates for 2007 WD5. This is the 1-gyro version of Visit 2 Placeholder for WFPC2 observations of Mars before and after impact. This visit may be duplicated for multiple observing windows as available. (Tic-Visit :proposal-id 11497 :visit-id "04" :proposal-version -1 :trans-version "20070709" :date "08-Jan-2008 23:06:27.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "26" :si-bright-earth-limb-angle 20.0 :data-volume 134448 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11497 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11497 :visit-id "04" :orbit-number 1 :pcs-time 355 :si-vis-utilization 549 :al-overhead-at-end 120 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 671.0 :low-sky "N" :pcs-visibility 1026.0 :pcs-gap 0 ) false 1 0 On hold pending orbit updates for 2007 WD5. Placeholder for WFPC2 observations of Mars before and after impact. This visit may be duplicated for multiple observing windows as available. (Tic-Visit :proposal-id 11497 :visit-id "04" :proposal-version -1 :trans-version "20070709" :date "08-Jan-2008 23:06:27.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "26" :si-bright-earth-limb-angle 20.0 :data-volume 134448 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11497 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11497 :visit-id "04" :orbit-number 1 :pcs-time 355 :si-vis-utilization 549 :al-overhead-at-end 120 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 671.0 :low-sky "N" :pcs-visibility 1026.0 :pcs-gap 0 ) false 1 0 On hold pending orbit updates for 2007 WD5. This is the 1-gyro version of visit 4.