We serendipitously detected a small part of the bow-shock around PSR J0437-4715 in FUV, during our spectroscopic observations of this nearby pulsar. This pulsar is known to be accompanied by a prominent H-alpha bow-shock but, to our surprise, we have discovered its clear counterpart in the FUV image (Figure 1). We are not aware of any instance where both H-alpha and FUV emission are seen from a bow-shock outside the Solar system. The origin of the FUV emission is enigmatic, and the spatial structure of the FUV emission and its relative extent compared to the H-alpha bow are not yet known. We wish to understand the origin of the FUV emission and use both H-alpha and FUV images to constrain the bow-shock physics and the local ISM properties. Using three long-pass filters in the FUV, we will probe the spatially resolved spectrum of the FUV emission and, at the same time, image most of the bow-shock with subarcsecond resolution. We will also obtain a contemporaneous, high-resolution H-alpha image. This, together with knowledge of the pulsar energetics, will allow us to model the emission mechanism and physical conditions throughout the bow-shock, a unique opportunity only available for this object and only using HST's FUV capabilities. We are imaging the faint, extended bow-shock emission in the vicinity of J0437-4715. For such imaging, the final S/N ratio will be dominated by the glow component whose strength depends on the previous SBC usage. Therefore, if at all possible, we ask to schedule our observations in such a way that the SBC has not been used immediately prior to each of our visits. For the FUV imaging, the F115LP and F125LP filters will be used while the spacecraft is in the earth's shadow, in order to avoid the high background associated with geocoronal emission. The F140LP imaging cuts out this emission and does not need to be taken in the shadow. The pointing and orientation of the SBC are chosen such that a) the majority of the bow shock lies on the chip, away from the worst of the detector glow and b) the nearby bright object. The one potentially concerning Bright Object in the field is S2JI010362. In GSC 2.2 it has V=15.13, B-V=0.15. According to http://www.stsci.edu/hst/acs/documents/handbooks/cycle19/c07_obstechniques03.html this object (which is a galaxy) would be dangerous if it were earlier type than A1. However, A1 has B-V=0, and so the object is clearly redder and therefore not a worry. Furthermore, it has B-V=0.83 in NOMAD (0427-0057510) and J-K=1.01 in 2MASS (069.310478), even redder. Additionally, we constrain the SBC detector orientation to ensure that the object is not in the field of view. The orientation and location of the SBC is very similar to our previous observation 10568, for which the nearby galaxy was not a problem. HOT STARS 12 false 0.0 0.0 false false false false SUPPORTED ISM EJECTA FILAMENT SHOCK FRONT J2000 J2000 ACS/SBC Imaging No No F125LP ACS/SBC Imaging No No F115LP ACS/SBC Imaging No No F140LP ACS/WFC Imaging No No F658N POS-TARG DITHER 0.265 LINE 0.187 false false 69.05 4 20.67 ACS-WFC-DITHER-BOX 1 false POS-TARG DITHER 0.472 LINE false false 3 44.4 ACS-SBC-DITHER-LINE 2 false The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 12917 :visit-id "01" :proposal-version -1 :trans-version "20120604" :date "11-Jul-2012 15:41:01.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "28" :si-bright-earth-limb-angle 20.0 :data-volume 111088 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12917 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12917 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2472 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset 0 :dark-utilization 1681 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3024 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12917 :visit-id "01" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2472 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset 0 :dark-utilization 1668 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3024 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12917 :visit-id "01" :orbit-number 3 :pcs-time 222 :si-vis-utilization 2472 :al-overhead-at-end 0 :internal-dur-at-end 158 :dark-offset 0 :dark-utilization 1668 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3024 :pcs-gap 0 ) true 3 0 The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 12917 :visit-id "02" :proposal-version -1 :trans-version "20120604" :date "11-Jul-2012 15:41:02.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "28" :si-bright-earth-limb-angle 20.0 :data-volume 111088 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12917 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12917 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2467 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset 0 :dark-utilization 1681 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3024 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12917 :visit-id "02" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2462 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset 0 :dark-utilization 1663 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3024 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12917 :visit-id "02" :orbit-number 3 :pcs-time 222 :si-vis-utilization 2462 :al-overhead-at-end 0 :internal-dur-at-end 158 :dark-offset 0 :dark-utilization 1663 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3024 :pcs-gap 0 ) true 3 0 The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 12917 :visit-id "03" :proposal-version -1 :trans-version "20120604" :date "11-Jul-2012 15:41:03.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 1136896 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12917 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12917 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2691 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3024 :pcs-gap 0 ) true 1 0