SP-474 Voyager 1 and 2 Atlas of Six Saturnian Satellites

 

PART 4

[71] Dione

 

Diameter

1118 km (695) miles)

Density

1.4

Albedo

0.8

Brightest:

0.6

Darkest:

0.3

Distance from Saturn

379 074 km (235 545 miles)

Orbital period

66 hr, 7 min, 59 sec

Voyager 1 closest approach

161 520 km (100 364 miles)

Voyager 1 pictures used in mapping

9

Voyager 2 closest approach

502 250 km (312 083 miles)

Voyager 2 pictures used in mapping

0

Although it is only slightly larger than Tethys, Dione has a distinctly higher density. It exhibits albedo contrast second only in the Saturnian system to Iapetus. A complex network of bright wispy markings divides the dark trailing hemisphere into polygons, whereas the cratered leading hemisphere has an albedo intermediate between the wispy material and the dark polygons.

 

[72] Figure 4-1. Resolution of Voyager pictures of Dione in terms of aerial coverage.

Figure 4-1. Resolution of Voyager pictures of Dione in terms of aerial coverage.

[73] Figure 4-2. Index of Voyager 1 and 2 pictures used to compile the maps of Dione. Picture numbers indicate the subspacecraft point at the time the pictures were taken. Contour lines indicate the approximate resolution of available images in kilometers per picture element. (See also fig 4-1.)

Figure 4-2. Index of Voyager 1 and 2 pictures used to compile the maps of Dione.

[74 - 75] Figure 4-3. Map of the equatorial region of Dione on a Mercator projection (part of map I-1488).

Figure 4-3. Map of the equatorial region of Dione on a Mercator projection (part of map I-1488).

Figure 4-3. Map of the equatorial region of Dione on a Mercator projection (part of map I-1488).-continued

[76] Figure 4-4. Maps of the polar regions of Dione on polar stereographic projections (part of map I-1488). (a) North polar region. (b) South polar region.

Figure 4-4. Maps of the polar regions of Dione on polar stereographic projections (part of map I-1488). (a) North polar region. (b) South polar region.

[77] Figure 4-5. Maps of Dione on Lambert azimuthal equal-area projections. Nomenclature is not shown, to avoid obscuring detail. Scale 1:10 000 000 (1 mm2 = 100 km2; 1 in2 = ~25 000 mi2). (a) Anti-Saturn-facing hemisphere. (b) Saturn-facing hemisphere.

Figure 4-5. Maps of Dione on Lambert azimuthal equal-area projections. Nomenclature is not shown, to avoid obscuring detail.

[78] Figure 4-6. Picno 0011S1-001. (a) Unfiltered image. (b) High-pass filtered image. (c) Perspective grid.

Picno

0011S1-001

FDS

34914.07

Range, km

1 171 769

Subspacecraft latitude/longitude, degrees

2/182

Subsolar latitude/longitude, degrees

4/201

Resolution, km/pixel

11

Filter size, pixels

101 x 101

Filter size, km

1094

Scale

1:10 000 000

Figure 4-6. Picno 0011S1-001. (a) Unfiltered image. (b) High-pass filtered image. (c) Perspective grid.

[79] Figure 4-7. Picno 0690S1-001. (a) Unfiltered image. (b) High-pass filtered image. (c) Perspective grid.

Picno

0690S1-001

FDS

34925.26

Range, km

794 254

Subspacecraft latitude/longitude, degrees

-2/246

Subsolar latitude/longitude, degrees

4/250

Resolution, km/pixel

7

Filter size, pixels

101 x 101

Filter size, km

742

Scale

1:10 000 000

Figure 4-7. Picno 0690S1-001. (a) Unfiltered image. (b) High-pass filtered image. (c) Perspective grid.

[80] Figure 4-8. Picno 0971S1-001. (a) Unfiltered image. (b) High-pass filtered image. (c) Perspective grid.

Picno

0971S1-001

FDS

34930.07

Range, km

697 095

Subspacecraft latitude/longitude, degrees

-5/272

Subsolar latitude/longitude, degrees

4/271

Resolution, km/pixel

6

Filter size, pixels

101 x 101

Filter size, km

651

Scale

1:10 000 000

Figure 4-8. Picno 0971S1-001. (a) Unfiltered image. (b) High-pass filtered image. (c) Perspective grid.

[81] Figure 4-9. Picno 1182S1-001. (a) Unfiltered image. (b) High-pass filtered image. (c) Perspective grid.

Picno

1182S1-001

FDS

34933.38

Range, km

622 631

Subspacecraft latitude/longitude, degrees

-8/291

Subsolar latitude/longitude, degrees

4/287

Resolution, km/pixel

5

Filter size, pixels

101 x 101

Filter size, km

581

Scale

1:10 000 000

Figure 4-9. Picno 1182S1-001. (a) Unfiltered image. (b) High-pass filtered image. (c) Perspective grid.

[82] Figure 4-10. Picno 0062S1+000. (a) Unfiltered image. (b) High-pass filtered image. (c) Perspective grid.

Picno

0062S1+000

FDS

34944.58

Range, km

237 809

Subspacecraft latitude/longitude, degrees

-26/360

Subsolar latitude/longitude, degrees

4/336

Resolution, km/pixel

2

Filter size, pixels

101 x 101

Filter size, km

222

Scale

1:10 000 000

Figure 4-10. Picno 0062S1+000. (a) Unfiltered image. (b) High-pass filtered image. (c) Perspective grid.

[83] Figure 4-11. Picno 0066S1+000. (a) Unfiltered image. (b) High-pass filtered image. (c) Perspective grid.

Picno

0066S1+000

FDS

34945.02

Range, km

235 367

Subspacecraft latitude/longitude, degrees

-26/1

Subsolar latitude/longitude, degrees

4/336

Resolution, km/pixel

2

Filter size, pixels

101 x 101

Filter size, km

220

Scale

1:10 000 000

Figure 4-11. Picno 0066S1+000. (a) Unfiltered image. (b) High-pass filtered image. (c) Perspective grid.

[84] Figure 4-12. Picno 0266S1+000. (a) Unfiltered image. (b) High-pass filtered image. (c) Perspective grid.

Picno

0266S1+000

FDS

34948.22

Range, km

162 832

Subspacecraft latitude/longitude, degrees

-11/55

Subsolar latitude/longitude, degrees

4/351

Resolution, km/pixel

1

Filter size, pixels

101 x 101

Filter size, km

152

Scale

1:10 000 000

Figure 4-12. Picno 0266S1+000. (a) Unfiltered image. (b) High-pass filtered image. (c) Perspective grid.

[85] Figure 4-13. Picno 0272S1+000. (a) Unfiltered image. (b) High-pass filtered image. (c) Perspective grid.

Picno

0272S1+000

FDS

34948.28

Range, km

162 363

Subspacecraft latitude/longitude, degrees

-10/56

Subsolar latitude/longitude, degrees

4/351

Resolution, km/pixel

1

Filter size, pixels

101 x 101

Filter size, km

152

Scale

1:10 000 000

Figure 4-13. Picno 0272S1+000. (a) Unfiltered image. (b) High-pass filtered image. (c) Perspective grid.

[86] Figure 4-14. Picno 0276S1+001. (a) Unfiltered image. (b) High-pass filtered image. (c) Perspective grid.

Picno

0276S1+001

FDS

34948.32

Range, km

162 108

Subspacecraft latitude/longitude, degrees

-9/58

Subsolar latitude/longitude, degrees

4/352

Resolution, km/pixel

1

Filter size, pixels

101 x 101

Filter size, km

151

Scale

1:10 000 000

Figure 4-14. Picno 0276S1+001. (a) Unfiltered image. (b) High-pass filtered image. (c) Perspective grid.

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