Sky & Telescope - August 2020 - 22
Celestial Pool
B88
9 Sgr
B89
Her 36
HD 165052
Hourglass
Dark channel
NGC 6530
B296
S A PLETHORA OF OBJECTS A labeled version (above) and inverted version (opposite page) of the author's low-power drawings of the Lagoon
Nebula show the multitude and variety of observable targets.
Milky Way star fields. And with the open cluster NGC 6530
being a major component of M8, I prefer seeing its lovely
stars in their unfiltered glory.
NGC 6530 is a beauty. Consisting of more than 100 suns,
around two dozen of the brightest members (ranging from
about 7th to 10th magnitude) are arrayed in an eye-catching
pattern that would be a sensational sight even without their
beautiful nebulous environment. These are young stars, only
2 to 4 million years old, and research suggests that the cluster
is currently gravitationally unbound (making it more of a
stellar association rather than an open cluster), although it
may not always have been in its past.
What could be better than soaking up the low-power
view of the lovely Lagoon and its cluster together? As it
turns out, one can see even more magnificence by bumping
up the magnification.
A Little Closer
We've all seen amazing images of the Lagoon festooned
with a series of dark globs of matter spread across its bright
nebulosity. Many of these are Bok globules - collapsing protostellar clouds - essentially, the birthplaces of stars. Some
of the globules are visible if you bump up the magnification.
These relatively compact dark clouds lie in front of the bright
How did M8 come to be called the Lagoon Nebula? My
guess is that the smooth, curved silhouette of the dark
channel splitting the brightest regions of the nebula in half
was the inspiration even though it didn't look like a lagoon.
Yes, but. This distinctive feature wasn't always seen this
way. John Herschel performed a detailed study of M8 from
the Southern Hemisphere in the 1830s, and his monograph
22
AUGUST 2 02 0 * SK Y & TELESCOPE
published in 1847 shows an oval pool where I see a flowing
streak. Agnes M. Clerke suggested in her book The System
of the Stars, published in 1890, that M8 "might be designated the 'Lagoon' nebula" based on Herschel's description of "a number of oval dark vacancies" in the nebula (see
https://is.gd/clerke for Clerke's comments). I now officially
know more than when I was 14.
HOWA RD BA NICH
What's in a name?
https://www.is.gd/clerke
Sky & Telescope - August 2020
Table of Contents for the Digital Edition of Sky & Telescope - August 2020
Contents
Sky & Telescope - August 2020 - Cover1
Sky & Telescope - August 2020 - Cover2
Sky & Telescope - August 2020 - 1
Sky & Telescope - August 2020 - Contents
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