2009 jupiter impact: second time...
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2009 Jupiter Impact: �Second Time Around
NASA/IRTF RAPID RESPONSE OBSERVATION CAMPAIGN
PI: Glenn S. Orton (JPL) Co-I: Padma A. Yanamandra-Fisher, Leigh N. Fletcher
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MOCA '09
Anthony Wesley, Murrumbateman, Australia: RGB composite�
2009 July 19, 15:55 UT
Possible impact site? -Too dark for “normal” colors on Jupiter: -Morphology is like SL9 impact sites: dark center & ejecta field to northwest
-Smoking gun: high-altitude particulates visible in near-IR… cue the IRTF!
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Serendipitous IRTF observing run on Jupiter (Orton et al.): � 2009 July 20: 10:00 – 16:00 UT (~20 hours after the impact)� Smoking gun: debris field obvious at 2 µm (strong CH4, H2 absorption)
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1.69 µm
2.23 µm
2.12 µm
- particulate field is as high or higher than those in the � Great Red Spot ↓�
Initial Guide Dog images
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↑
↑
↑ 8.9 µm
9.8 µm
11.7 µm
IRTF: MIRSI, 2009 July 20
Enhanced emission in NH3 (band centered near 10 μm)
Implies that some NH3 was uplifted from the impact backwash and transported into Jupiter’s warm stratosphere
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Spread of Debris Field: 2.16-2.23 μm Imaging – Tracking of Upper-Level Winds
July 20
Aug 5
(enhanced)
Sept 2
(enhanced)
Aug 15
Latitude extent ~ 9° Longitude extent ~ 90°
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Jupiter at 2.23 microns, 08 Sep.
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SpeX SXD Spectra :�Impact Site vs Unperturbed Atmosphere
26 July 2009 - impact site - unperturbed atmosphere
0.3x 15” slit
Wavelength (microns)
Nor
mal
ized
Rad
ianc
e
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Summary
• Impacton2009July19,between07:00and14:02UT,305±3°W(SystemIII)and56.2±1.2°S(planetographic)
• DebrisfieldandtemperatureperturbaMonssuggestsimilariMeswiththeimpactsofintermediateShoemaker‐Levy9fragmentsandimpactorsizeofhundredsofmeters,maybeupto0.5km,ifobjectwasicy
• EnhancementofNH3emission,suggestsupliXingintothewarmstratospherefromreboundphase,similartomostSL9fragments
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Worldwide Coverage of IRTF Results
Exciting Student Summer Research!
2009 July 20, 9:22 am PDT