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The Neptune System Revised: The Neptune System Revised: New Results - - PowerPoint PPT Presentation
The Neptune System Revised: The Neptune System Revised: New Results - - PowerPoint PPT Presentation
The Neptune System Revised: The Neptune System Revised: New Results on the Moons New Results on the Moons and Rings from HST and Rings from HST Mark Showalter, mshowalter@seti.org, 650-346-5276 Mark Showalter, mshowalter@seti.org,
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Unprocessed Image Unprocessed Image
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Filtered for Glare & Artifacts
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Filtered for Glare & Artifacts
Larissa Despina Galatea
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Larissa Despina Galatea
Eight Images Added
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Question: How do we turn eight 5-minute exposures into one 40-minute exposure?
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Question: How do we turn eight 5-minute exposures into one 40-minute exposure? Question: How do we turn eight 5-minute exposures into one 40-minute exposure?
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Answer: Distort each image to compensate for the orbital motion. Answer: Distort each image to compensate for the orbital motion.
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Answer: Distort each image to compensate for the orbital motion. Answer: Distort each image to compensate for the orbital motion.
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Answer: Distort each image to compensate for the orbital motion. Answer: Distort each image to compensate for the orbital motion.
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Answer: Distort each image to compensate for the orbital motion. Answer: Distort each image to compensate for the orbital motion.
Image 1
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Answer: Distort each image to compensate for the orbital motion. Answer: Distort each image to compensate for the orbital motion.
Image 2
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Answer: Distort each image to compensate for the orbital motion. Answer: Distort each image to compensate for the orbital motion.
Image 3
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Answer: Distort each image to compensate for the orbital motion. Answer: Distort each image to compensate for the orbital motion.
Image 4
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Answer: Distort each image to compensate for the orbital motion. Answer: Distort each image to compensate for the orbital motion.
Image 5
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Answer: Distort each image to compensate for the orbital motion. Answer: Distort each image to compensate for the orbital motion.
Image 6
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Answer: Distort each image to compensate for the orbital motion. Answer: Distort each image to compensate for the orbital motion.
Image 7
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Answer: Distort each image to compensate for the orbital motion. Answer: Distort each image to compensate for the orbital motion.
Image 8
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...and then add them.
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Objects too faint to be seen in a single exposure appear!
Thalassa S/2004 N 1 discovery
...and then add them. Objects too faint to be seen in a single exposure appear! ...and then add them.
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ACS/HRC
December 8, 2004 8 images
Naiad
The recovery of Naiad
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S/2004 N 1 Proteus Larissa Galatea Thalassa x Despina Naiad
Neptune’s Inner Satellite System
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ACS/HRC
December 8, 2004 8 images
S/2004 N 1 Proteus Larissa Galatea Thalassa x Despina x
Naiad is ahead of its prediction by 80°
predicted found
Neptune’s Inner Satellite System
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Neptune’s Rings and Arcs
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Adams Ring Leverrier Ring Arcs
Neptune’s Rings and Arcs
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All of Neptune’s Arcs Seem to be Fading
Orbital longitude (°) Integrated Intensity (m) Voyager 1989 HST 2005 HST 2009
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Summary
- We have a processing technique capable of revealing new
- bjects in old HST data.
- Naiad has been seen for the first time from Earth.
- What’s up with its orbit?
(1) Long-term orbital interactions? (interesting!) (2) Standard orbital uncertainties? (not so much)
- We have the first visual light detections of the arcs,
suitable for quantitative comparison with Voyager.
- One arc is gone completely; the other two are fading.
- We now have TWO dynamical problems:
(1) What confines the arcs? (2) Why isn’t it working? (...for periods of decades.)
Mark Showalter, SETI Institute, mshowalter@seti.org, 650-346-5276