Sky and Telescope - July 2018 - 59
u PALE PLANETARY A chain of 8th- to 10thmagnitude stars lies just east of the ghostly
planetary nebula NGC 6842. The chain's
westernmost star, 8.7-magnitude HD 332981,
shines helpfully 7′ northeast of the faint target.
The image is approximately 30′ × 30′ in size.
vision at 228×, I glimpsed two or three
exceedingly faint ﬂecks on the disk
itself. At 411×, the number increased to
four or ﬁve. One of them might have
been the 15.9-magnitude central star.
Next, I pushed less than 2/3° westnorthwestward into Cygnus to ﬁnd
NGC 6834. This 7.8-magnitude open
cluster is similar to Roslund 4 in size;
however, unlike the Roslund example,
NGC 6834 is a compact, alluringly
The cluster's 9.7-magnitude lucida
centers a 6′-long row of ﬁve stars (none
dimmer than magnitude 11.6) stretching east-northeast by west-southwest
along NGC 6834's northern region. At
69×, I observed the glittering row as one
prominent side of an equilateral triangle. The other sides raggedly deﬁned the
east and west edges of the cluster. The
stars inside the triangle thinned toward
the indistinct apex establishing NGC
6834's south end. Near the apex on the
cluster's west edge was a blurry, 13thmagnitude "knot" begging scrutiny.
An eyepiece generating 147× resolved
the knot into ﬁve tightly packed points.
That magniﬁcation picked up more dim
dots interspersed among the row-ofﬁve, plus maybe a half-dozen 13th- and
14th-magnitude stars north of the row,
outside the triangle. The bulk of the
cluster lay southward, where the dense
central population numbered possibly
two dozen stars, all of them beyond
12th magnitude. In total, I tallied 50 to
60 suns - hardly epic; still, the glittery
package was attractive.
After NGC 6834, I hopped 3¾° westward to 5th-magnitude 9 Cygni, then
reversed 1/3° east-northeastward to snag
Minkowski 92 (M1-92), an exotic object
nicknamed Minkowski's Footprint. The
11.7-magnitude nebula lies 28″ east of
a 9.7-magnitude star (the southern of
Roslund 4 6842
POSS-II / STSCI / CA LTECH / PA LO M A R OBSERVATORY
Across Lower Cygnus
p THE ROAD LESS TRAVELED A route northward from M27, then westward toward M57, passes
by several disparate deep-sky objects.
s k y a n d t e l e s c o p e . c o m * J U LY 2 0 1 8