Sky and Telescope - March 2016 - 33

Alan Whitman anticipates seeing Howard
Banich's sketch of M81 made with big glass
in an upcoming issue.

M51

KEN CRAWFORD / IMAGINGDEEPSKY.COM

of just seeing the broken-ring effect, I
could clearly trace both of the main arms
at 116×. I also saw the long condensation
on the eastern part of the inner eastern
arm, and a knot equidistant between
the two galactic nuclei. A line, drawn
from the 13.5-magnitude foreground star
through M51's nucleus and extended 1.5
times this distance, ends at this knot.
I showed M51 to members of the
general public with Chaco Observatory's
25-inch at 113×. With this big glass, the
novice observers could see well the spiral
arms after instruction in averted vision!
Because it lies in Hydra, M83 is often
considered a southern target (indeed, it's
also called "the Southern Pinwheel Galaxy"). I enjoyed a fine view of the spiral
at 135× through my 8-inch in Arizona,
observing the galaxy's bar with a bright
nucleus, and a segment of the brightest
(eastern) arm. Two years later, during a
Messier Marathon with the same scope
at latitude 49° north, I lingered over
some of the southern objects instead of
moving on promptly as one should during marathons. At 93× M83 showed the
same details that I had seen in Arizona
- remarkable given that it culminates at
only 11° altitude at that latitude.
By way of contrast, consider my logbook entry made when viewing M83 at
65° altitude in Australia with Tony Buckley's 14.5-inch Newtonian at 136×: "Wow!
Just like the photos! Prominent northeast
to southwest bar with a bright core holding a stellar nucleus. Two obvious spiral
arms, and the third (shorter) arm was just
detected (confirmed by the position of the
brightest foreground star on photos). The
very long arm which circles the galaxy is
only visible for the first half of its length,
on the northwestern side of M83." I look
forward to viewing M83 with a 30-inch in
Australia this April.
These splendid spiral galaxies are
worthy of many careful views. It takes
time and experience to tease out their low
contrast details, so make plans to visit
them every spring - your return visits
won't disappoint. ✦

ORIGINAL MODEL Sketched famously by Lord Rosse in 1845, M51 was the first galaxy to be
revealed as spiral. Its interacting neighbor, NGC 5195, likely passed through M51's main disk
some 50 to 100 million years ago.

Sk yandTelescope.com March 2016

33


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Sky and Telescope - March 2016

Table of Contents for the Digital Edition of Sky and Telescope - March 2016

Contents
Sky and Telescope - March 2016 - Cover1
Sky and Telescope - March 2016 - Cover2
Sky and Telescope - March 2016 - 1
Sky and Telescope - March 2016 - Contents
Sky and Telescope - March 2016 - 3
Sky and Telescope - March 2016 - A
Sky and Telescope - March 2016 - B
Sky and Telescope - March 2016 - 4
Sky and Telescope - March 2016 - 5
Sky and Telescope - March 2016 - 6
Sky and Telescope - March 2016 - 7
Sky and Telescope - March 2016 - 8
Sky and Telescope - March 2016 - 9
Sky and Telescope - March 2016 - 10
Sky and Telescope - March 2016 - 11
Sky and Telescope - March 2016 - 12
Sky and Telescope - March 2016 - 13
Sky and Telescope - March 2016 - 14
Sky and Telescope - March 2016 - 15
Sky and Telescope - March 2016 - 16
Sky and Telescope - March 2016 - 17
Sky and Telescope - March 2016 - 18
Sky and Telescope - March 2016 - 19
Sky and Telescope - March 2016 - 20
Sky and Telescope - March 2016 - 21
Sky and Telescope - March 2016 - 22
Sky and Telescope - March 2016 - 23
Sky and Telescope - March 2016 - 24
Sky and Telescope - March 2016 - 25
Sky and Telescope - March 2016 - 26
Sky and Telescope - March 2016 - 27
Sky and Telescope - March 2016 - 28
Sky and Telescope - March 2016 - 29
Sky and Telescope - March 2016 - 30
Sky and Telescope - March 2016 - 31
Sky and Telescope - March 2016 - 32
Sky and Telescope - March 2016 - 33
Sky and Telescope - March 2016 - 34
Sky and Telescope - March 2016 - 35
Sky and Telescope - March 2016 - 36
Sky and Telescope - March 2016 - 37
Sky and Telescope - March 2016 - 38
Sky and Telescope - March 2016 - 39
Sky and Telescope - March 2016 - 40
Sky and Telescope - March 2016 - 41
Sky and Telescope - March 2016 - 42
Sky and Telescope - March 2016 - 43
Sky and Telescope - March 2016 - 44
Sky and Telescope - March 2016 - 45
Sky and Telescope - March 2016 - 46
Sky and Telescope - March 2016 - 47
Sky and Telescope - March 2016 - 48
Sky and Telescope - March 2016 - 49
Sky and Telescope - March 2016 - 50
Sky and Telescope - March 2016 - 51
Sky and Telescope - March 2016 - 52
Sky and Telescope - March 2016 - 53
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Sky and Telescope - March 2016 - 56
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Sky and Telescope - March 2016 - 79
Sky and Telescope - March 2016 - 80
Sky and Telescope - March 2016 - 81
Sky and Telescope - March 2016 - 82
Sky and Telescope - March 2016 - 83
Sky and Telescope - March 2016 - 84
Sky and Telescope - March 2016 - Cover3
Sky and Telescope - March 2016 - Cover4
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