Sky and Telescope - March 2016 - 58

OBSERVING

Going Deep

expanded the target list to include 9 objects. My best
view of the hidden galaxies came over a few nights in
January 2015 when I explored the area from my backyard
observatory outside of Sierra Vista, Arizona.
NGC 2647 is the easternmost galaxy inside the
boundaries of the bright cluster. At about 720 million
light-years from Earth, the galaxy is more than a million times more distant than the cluster itself. At ﬁrst
glance, it appears as a small, concentrated spot, but with
a little eﬀort on the part of the observer, it reveals itself
as a roundish halo with a brighter core. The galaxy is
only a bit elongated along its northeast-southwest axis.
You might expect dense star ﬁelds within a rich open
cluster like the Beehive, but at high powers, the ﬁeld of
view isn't at all crowded. NGC 2647's immediate stellar
neighbors are 12th and 13th magnitude and oﬀer no
real impediment to the detection of the galaxy. It sits
just north of a pair of 12th-magnitude stars and about

NGC 2643

1′ northwest of a 13.4-magnitude star. I used 300× and
390× in my 30-inch f/4.5 Dob to observe this elliptical,
but detected it previously in smaller apertures without
much diﬃculty.
Moving about 12.5′ west-northwest brings NGC 2643
into view. This galaxy suﬀers from a bit of an identity
crisis, with many sources equating it with IC 2390 and
others questioning this identiﬁcation. Albert Marth discovered the galaxy in 1864, and he apparently recorded
an 11′ error in its position. IC 2390, which is almost
certainly the same object, was discovered independently
Because of its size (at 95 arcminutes, it's about three times as
broad as the full Moon), M44 is considered an ideal target for
small telescopes and binoculars. But if you pump up the aperture
and magniﬁcation, not to mention your determination and
patience, you'll ﬁnd a host of galaxies hiding between the cool
blues and warm yellows of the cluster's stars.

NGC 2625

NGC 2624

NGC 2637

NGC 2647

IC 2388

PGC 24284

PGC 24335

MCG +3-22-21

BOB FRANKE

58

March 2016 sky & telescope

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
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Sky and Telescope - March 2016 - Cover3
Sky and Telescope - March 2016 - Cover4
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