Sky and Telescope - September 2017 - 36

Observing Logs

about your view or what you want to record, revisit these suggestions for some guidance.

Planets
* Mars: Use an online tool such as the Sky & Telescope Mars
Profiler (https://is.gd/marsprofiler) to find out which hemisphere and what dark albedo marking face you at the time
of observation. Watch for clouds, limb hazes, and the bright
orange clouds that signify major dust storms in progress.
Note the expansion or contraction of the polar caps with the
changing seasons.
* Jupiter: Note the color of the cloud belts and whether
they're continuous or broken. Are there any dark curls (festoons) in the broad Equatorial Zone? What color is the Great

Red Spot this season, and how do cloud textures vary preceding versus following the Spot? Are the equatorial belts single
or double? Does their texture vary with longitude? What's
the current position of the planet's moons? Use the Sky &
Telescope tool to identify them (https://is.gd/JupMoons).
During shadow transits, examine the size of the shadows and
how their paths over the planet vary. Before long, you'll know
which moon-shadow is which without even checking.
* Saturn: Is Cassini's Division visible? How many belts stripe
the planet? Can you discern the gray-topped polar regions?
Do color filters improve the view of certain features? Search
for the five brightest moons using the Sky & Telescope Saturn's
Moons tool (https://is.gd/SatMoons).

Deep-Sky Objects
* Globular clusters: Is the core compact or loose? Can you
resolve stars in the halo? In the core? How does the cluster
change in appearance with averted vision? Some globulars

BOB KING

q RECENT OBSERVATIONS This sample of entries comes from the
author's more recent astronomy journals and includes observations of a
close Mars apparition, nebulae in M33, and Comet 153P/Ikeya-Zhang.

36

S E P T E M B E R 2 0 1 7 * SK Y & TELESCOPE


https://www.is.gd/JupMoons https://www.is.gd/marsprofi https://www.is.gd/SatMoons

Sky and Telescope - September 2017

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