Sky & Telescope - December 2024 - 67

Johnson-Cousins U mean albedo: 0.37
0.1
0.2
0.3
0.4
0.5
0.6
0.7
90
60
30
Latitude
−30 −60 −90
Johnson-Cousins B mean albedo: 0.41
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
90
WIDE SWATH The program RSpec lets you define the region of an
image you want to measure and generates a graph displaying the intensity
of the signal within the region of interest.
multiplied by the global albedo value to produce the albedo
measurement of the EZ. The same method can be applied to
any other regions of interest.
Monitoring Changes in Jupiter's
Atmosphere
High-resolution imaging closely tracks changes in Jupiter's
appearance, but those images don't tell us everything.
Meteorological events have additional consequences for the
albedo of the belts, zones, and ovals due to the upwelling of
material from deeper within the planet's atmosphere. Simply
put, those changes not only modify the shape of the clouds
but also their colors as well. A well-known example of this
occurred in 2006 when Philippine amateur Christopher Go
noticed Oval BA had changed color from white to red.
I've also photometrically monitored individual storms on
Jupiter like the GRS or Oval BA using the same technique as
used for the EZ described earlier.
Both of these spots exhibit color variations in some key
bands, such as UV, B, or CH4. When a red spot intensifies, it
becomes darker in UV and B and brighter in CH4. As men0.9
0.8
0.1
0.2
0.3
0.4
0.5
0.6
0.7
90
60
30
Latitude
SPECTRAL
PLOTS These graphs show the measured albedo
changes seen in Jupiter's zones and belts between 2021 (dotted
line) and 2022 (solid line) in ultraviolet, blue, and red wavelengths.
Note that the greatest differences are seen in the shorter (ultraviolet
and blue) spectral regions.
sk yand tele scope .o r g * DECEMBER 2024 67
−30 −60 −90
60
30
Latitude
−30 −60 −90
Johnson-Cousins R mean albedo: 0.51
Geometric albedo
Geometric albedo
Geometric albedo

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Sky & Telescope - December 2024

Table of Contents for the Digital Edition of Sky & Telescope - December 2024

Contents
Sky & Telescope - December 2024 - Cover1
Sky & Telescope - December 2024 - Cover2
Sky & Telescope - December 2024 - 1
Sky & Telescope - December 2024 - Contents
Sky & Telescope - December 2024 - 3
Sky & Telescope - December 2024 - 4
Sky & Telescope - December 2024 - 5
Sky & Telescope - December 2024 - 6
Sky & Telescope - December 2024 - 7
Sky & Telescope - December 2024 - 8
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Sky & Telescope - December 2024 - 11
Sky & Telescope - December 2024 - 12
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Sky & Telescope - December 2024 - 81
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Sky & Telescope - December 2024 - 84
Sky & Telescope - December 2024 - Cover3
Sky & Telescope - December 2024 - Cover4
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