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Space Topics: Saturn

Data from Cassini's September 26, 2005 Flyby of Hyperion

This page covers all of the data from this flyby that has been released to the public so far. As new data is released, it will be added to this page. It was last updated on October 1, 2005.

About the Flyby - Imaging Plan - Science Plan - Data

About the Flyby

Date: September 26, 2005 02:25:51 UT (Rev 15)
Altitude: 505.0 kilometers
Approaching view: centered roughly at 36°S, 150°W (anti-Saturnian hemisphere) at a phase angle of about 50°
Closest approach view: 1.0°S, 243.8 °W at 47.6° phase
Departing view: centered roughly at 36°N, 330°W (sub-Saturnian hemisphere) at a phase angle of about 128°

Imaging Plan

No imaging plan has been released for this flyby.

Science Plan

For explanation of the science plan by Cassini mission planner Amanda Hendrix, read "Cassini Zooms in on Tethys and Hyperion." The plan is also outlined in a mission description (PDF) released by the Jet Propulsion Laboratory.

Spacecraft time (UTC) Time with
respect to
closest
approach to
Hyperion
Event
Sep 25
14:25
- 11h 59m Optical Remote Sensing of Hyperion (ISS prime)
As Cassini zooms toward Hyperion, VIMS and ISS trade priority and build up global maps while UVIS and CIRS take ride-along observations.
15:11 - 11h 14m Optical Remote Sensing of Hyperion (VIMS prime)
17:20 - 09h 05m Optical Remote Sensing of Hyperion (ISS prime)
17:22 - 09h 03m Optical Remote Sensing of Hyperion (ISS prime)
17:31 - 08h 54m Optical Remote Sensing of Hyperion (VIMS prime)
18:00 - 08h 25m Radio Science
As Cassini approaches, it will broadcast a radio signal to Earth. From careful analysis of the Doppler shift of the signal, radio scientists will be able to determine Hyperion's mass. These analyses can take months or even years.
20:20 - 06h 05m Optical Remote Sensing of Hyperion (ISS prime)
20:31 - 05h 54m Optical Remote Sensing of Hyperion (VIMS prime)
21:21 - 05h 04m Optical Remote Sensing of Hyperion (ISS prime)
21:23 - 05h 02m Optical Remote Sensing of Hyperion (ISS prime)
21:32 - 04h 53m Optical Remote Sensing of Hyperion (VIMS prime)
21:55 - 04h 30m Optical Remote Sensing of Hyperion (ISS prime)
22:21 - 04h 04m Optical Remote Sensing of Hyperion (CIRS prime)
Now quite close to Hyperion, CIRS can acquire a detailed map. VIMS now rides along as CIRS, ISS, and UVIS trade priority.
23:21 - 03h 04m Optical Remote Sensing of Hyperion (ISS prime)
23:41 - 02h 44m Optical Remote Sensing of Hyperion (UVIS prime)
Sep 26
00:40
- 02h 04m Optical Remote Sensing of Hyperion (ISS prime)
01:10 - 01h 15m Optical Remote Sensing of Hyperion (CIRS prime)
01:30 - 00h 55m Optical Remote Sensing of Hyperion (ISS prime)
01:55 - 00h 30m Radio and Plasma Wave observations of Hyperion through closest approach
02:18 - 00h 06m Optical Remote Sensing of Hyperion (CIRS prime)
02:25 + 00h 00m Hyperion-1 (15HE) Flyby Closest Approach
Altitude = 514 kilometers (319 miles), speed = 5.6 kilometers/second (12,500 miles/hour).
02:55 + 00h 29m Radio and Plasma Wave observations of Hyperion
03:18 + 00h 53m Optical Remote Sensing of Hyperion (UVIS prime)
04:10 + 01h 45m Radio Science
The Doppler tracking will resume on the outbound leg of the flyby to help determine Hyperion's mass.
05:55 + 03h 30m Hyperion Scatterometry (RADAR prime)
08:57 + 06h 32m Optical Remote Sensing of Hyperion (VIMS prime)
N00040147.jpg
N00040147.jpg
458,033 km
CL1 and CL2
Source


Science Data

At first, images placed here are single raw frames. As higher-level image products are released, they will be posted here. All ISS images are courtesy of NASA, JPL, and the Space Science Institute.

The view at right was shot for optical navigation about 20 hours before the flyby.


N00040151.jpg
N00040151.jpg
245,275 km
CL1 and UV3
Source

ISS: NA 5-color/polarization study (9 images total)
Filters: UV3, IR1, IR3, GRNx(P0,P60,P120), CL, CL, CL

September 25, 2005 at about 14:25
Raw images N00040151 to N00040159


Radio science observations of the mass of Hyperion preclude imaging for about 2 hours. All data were successfully acquired. Source


N00040160.jpg
N00040160.jpg
185,016 km
CL1 and CL2
Source
N00040173.jpg
N00040173.jpg
122,890 km
CL1 and CL2
Source
N00040183.jpg
N00040183.jpg
101,471 km
CL1 and CL2
Source

ISS: 3 @ NA 4-color/polarization study (29 images total)
Filters: CL, UV3x(P0,P60,P120), CL, CL, IR3, GRNx(P0,P60,P120)

September 25, 2005 at about 17:20
Raw images N00040160 to N00040169

September 25, 2005 at about 20:20
Raw images N00040170 to N00040178

September 25, 2005 at about 21:21
Raw images N00040179 to N00040188

Taken while alternating with VIMS spectral observations.


N00040189.jpg
N00040189.jpg
99,093 km
CL1 and CL2
Source

ISS: NA 4-color/polarization study (9 images total)
Filters: CL, UV3, IR1, IR3, GRNx(P0,P60,P120,CL), CL

September 25, 2005 at about 21:32
Raw images N00040189 to N00040197

Rider to VIMS spectral observations.


N00040201.jpg
N00040201.jpg
90,604 km
CL1 and CL2
Source

ISS: NA 4-color/polarization study (8 images total)
Filters: UV3x(P0,P60,P120), CL, IR3, GRNx(P0,P60,P120)

September 25, 2005 at about 21:55
Raw images N00040198 to N00040205


N00040206.jpg
N00040206.jpg
75,334 km
CL1 and CL2
Source

ISS: NA 5-color view (5 images total)
Filters: CL, UV3, GRN, IR1, IR3

September 25, 2005 at about 22:21
Raw images N00040206 to N00040210

Taken as a rider to CIRS focal plane 3 mapping of the disk.


Hyperion
The view employs a broader range of wavelengths than is visible to the human eye, from ultraviolet to infrared, and is enhanced to bring out subtle color variations. Source Credit: NASA / JPL / Space Science Institute

ISS: 2 @ NA 7-color/polarization study (19 images total)
Filters: UV3, CL, IR1, IR3, BL2, RED, GRNx(CL,P0,P60,P120)
(2nd set has UV3 moved to end of sequence and is missing GRNxP120)

September 25, 2005 at about 23:21
Raw images N00040232 to N00040249 and N00040431

Filter choices would permit a true color view. The view that has been released is a false color one, employing the IR3-GRN-UV3 color combination that helps to bring out the color variations on the surfaces of the icy satellites.


N00040258.jpg
N00040258.jpg
43,469 km
CL1 and CL2
Source

ISS: NA clear context (14 images total)

September 25, 2005 at about 22:21
Raw images N00040250 to N00040263

Taken as riders to UVIS mapping of the disk.


Color mosaic of Hyperion
Amateur image processor Mattias Malmer assembled a color mosaic of the images captured at 00:40. Like the color view above, it employs a broader range of wavelengths than is visible to the human eye, from ultraviolet to infrared, and is enhanced to bring out subtle color variations. Credit: © 2005 Mattias Malmer; raw data courtesy of NASA/JPL

ISS: NA 5-frame, 5-color/polarization study mosaic plus 1 WA clear context (41 images total)
Filters: CL, UV3, IR1, IR3, GRNx(P0,P60,P120)

September 26, 2005 at about 00:40
Raw images N00040264 to N00040298 and W0001680

Big, nearly full-disk color mosaic.


N00040305.jpg
N00040305.jpg
23,149 km
CL1 and CL2
Source

ISS: NA clear context (23 images total)
Filters: CL, UV3, GRN, IR1, IR3

September 26, 2005 at about 01:10
Raw images N00040299 to N00040321

Taken as a rider to CIRS focal plane 1 mapping of the disk.


N00040345.jpg
N00040345.jpg
12,657 km
CL1 and CL2
Source

ISS: NA 14-frame, 4-color mosaic (56 images total)
Filters: UV3, GRN, IR3, CL

September 26, 2005 at about 01:30
Raw images N00040322 to N00040377

Huge color mosaic. Clear filter images were returned at 1024x1024. Color frames were returned at 512x512. A five-image mosaic of clear-filter images has been released.

High-resolution mosaic of Hyperion's surface
Hyperion's strange surface only gets weirder on close view. The pixel scale in this view is 26 meters per pixel, revealing tiny details. Many of the visible features are mysterious -- the sharp, gullied crater walls, the fact that some craters are filled with landslide deposits while others are filled with smooth, dark material -- and the funnel shape of the craters. Source Credit: NASA / JPL / Space Science Institute

W00010681.jpg
W00010681.jpg
3,551 km
CL1 and CL2
Source
N00040378.jpg
N00040378.jpg
3,551 km
CL1 and CL2
Source

ISS: NA closest approach 4-color/polarization study + 1 WA clear context
Filters: CL, UV3x(P0,P60,P120), GRNx(P0,P60,P120), IR3

September 26, 2005 at about 02:10
Raw images N00040378 to N00040385 and W00010681

Because these were taken near closest approach, there is significant motion of the camera field of view from one exposure to the next, and the range also changes rapidly. Motion blur is evident, especially in the UV images. The clear images were returned ato 1024x1024, color at 512x512.


ISS: NA closest approach + WA context (21 images total)

September 26, 2005 at about 02:55
Raw images Raw images N00040386 to N00040405 and W00010682

Nearly all of these appear to look either at black space or Hyperion's nightside.


W00010683.jpg
W00010683.jpg
21,627 km
CL1 and CL2
Source
N00040410.jpg
N00040410.jpg
21,627 km
CL1 and CL2
Source

ISS: NA clear scan + 1 WA context (17 images total)

September 25, 2005 at about 03:18
Raw images N00040406 to N00040422 and N00040432 and W00010683

Taken as riders to UVIS mapping of the disk. One processed version has been released. A large mosaic would be possible.

Hyperion in crescent view
Hyperion in crescent view
Hyperion's battered, lumpy limb was seen in crescent view as Cassini retreated from its September 26, 2005 encounter. The spacecraft was about 32,000 kilometers from Hyperion when this image is taken. The view spans about 200 kilometers top to bottom. Source Credit: NASA / JPL / Space Science Institute

Radio science observations of the mass of Hyperion, and RADAR scatterometry of the nightside, preclude imaging for about 5 hours.

Unfortunately, the radio science mass determination data were lost due to a hardware failure at Madrid. Source


N00040427.jpg
N00040427.jpg
134,897 km
CL1 and IR3
Source

ISS: NA 4-color/polarization study (8 images total)
Filters: UV3x(P0,P60,P120), CL, IR3, GRNx(P0,P60,P120)

September 26, 2005 at about 08:57
Raw images N00040423 to N00040430

Rider to VIMS spectral observations.