Sky and Telescope - November 2016 - 59

HD 199097

B173

B150

HD 199610
HD 210433
N
B174

GIOVANNI BENINTENDE

HD 198386

B174

HD 210220
HD 208915

B169

B170

N

LORENZO COMOLLI

MICHAEL FULBRIGHT

B171

N

Left: Together, B173 and B174 compose a rough S-shape that trends north-south. Find B174 north of 6th-magnitude HD 210220; use low power to
get as much contrasting starfield in the eyepiece as possible. Upper right: The sinuous form of B150, better known as the Seahorse Nebula, varies in
opacity. If you're having difficulty finding it, look for the void south of HD 199097. Bottom right: The 8th-magnitude star HD 208915 sits north of the
darkest clouds of B170. Move south to the broad oval of B171, the east-west axis of which stretches some 91′.

B365 curves eastwards near its northern end. The most
prominent absorption nebula within IC 1396 is the dark
pore at the southern tip of B161.
I needed a UHC filter for IC 1396's other details.
V-shaped B163 was tough. I made out only the northeastern end of the V. Close scrutiny revealed three segments
of van den Bergh 142, the Elephant Trunk Nebula: the
two darkest parts in its western half as well as the energized bright rim on the southern side of the broadening
at the eastern end, adjacent to the east-west pair of 8thand 9th-magnitude suns. (This broadening is mislabeled
B142 on MSA charts 1073 and 1087, rather than vdB 142.
The real B142 is part of Barnard's E in Aquila.)
My unfiltered 8-inch Newtonian at 44× showed B365
and the dark pore of B161 just as well as the 16-inch does.
There's an X-shaped open cluster involved, also labelled
IC 1396, but it's so large and sparse that it's apparent
only in my 7×50 binoculars and small rich-field scopes.

North of IC 1396, B366 is a very subtle darkening
visible through the 16-inch. You wouldn't notice B366
if you were just sweeping through the field, but the
oval dark nebula can be detected at 76× by the paucity
of stars in comparison to the richer fields beyond its
plotted borders. Bright stars spangle the B169-B170-
B171 complex, but much of its shape is detectable by the
relative absence of faint embers. I expected that long,
narrow, S-shaped B173-B174 would be too thin to see,
but the ultra-low power of 45× showed the southern
half as a lack of faint stars combined with a very subtle
darkening; it's visible northwards as far as the headlight
double star (HD 210443 and HD 210432, 21′ apart) at the
nebula's midpoint. ✦
The International Astronomical Union recognized Contributing Editor Alan Whitman this year by giving asteroid
21330 the name Alanwhitman.
Sk yandTelescope.com November 2016

59



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Sky and Telescope - November 2016

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

Contents
Sky and Telescope - November 2016 - Cover1
Sky and Telescope - November 2016 - Cover2
Sky and Telescope - November 2016 - 1
Sky and Telescope - November 2016 - Contents
Sky and Telescope - November 2016 - 3
Sky and Telescope - November 2016 - A
Sky and Telescope - November 2016 - B
Sky and Telescope - November 2016 - 4
Sky and Telescope - November 2016 - 5
Sky and Telescope - November 2016 - 6
Sky and Telescope - November 2016 - 7
Sky and Telescope - November 2016 - 8
Sky and Telescope - November 2016 - 9
Sky and Telescope - November 2016 - 10
Sky and Telescope - November 2016 - 11
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Sky and Telescope - November 2016 - 41
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Sky and Telescope - November 2016 - Cover3
Sky and Telescope - November 2016 - Cover4
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