Sky & Telescope - June 2020 - 56

JUNE 2020 OBSERVING
Deep-Sky Wonders

5724

5723
5721
5722

5723
5717

5721
5722

5717

5714

this galaxy's 5.7′ length, a pin of light
pointing east-northeast. Texas amateur
Jimi Lowrey brought this super-thin
galaxy to my attention. How much of
its length can you see?
We'll end our tour with a compact
sextet of galaxies 1.9° west-northwest of
38 Boötis. In my 130-mm scope at 164×,
I can barely see three of these faint
galaxies with averted vision (that is, by
looking a little off to one side of each
object). NGC 5714 (magnitude 13.4)
is just a slightly elongated blur, while
NGC 5717 (mag. 14.4) and NGC 5722
(mag. 14.7) show only their tiny cores
as extremely faint spots. Two 13thmagnitude stars 5.2′ north-northwest of

5714

NGC 5722 point right to the galaxy.
Through my 10-inch scope at 166×,
NGC 5714 becomes a 1½′ streak tipped
a little north of east with a slightly
brighter, elongated core. A 12th-magnitude star hovering over the galaxy's
northern flank guards a 13th-magnitude star to its east. This flat galaxy
shares the field of view with NGC 5717
and NGC 5722. The former is a 1′
oval leaning northeast, which harbors
a brighter core and starlike nucleus.
NGC 5722 is small and round with an
elusive, stellar nucleus.
My 15-inch reflector at 216× adds
two fainter smudges to the group -
NGC 5721 (mag. 14.9) and NGC 5723

p Here's the author's impression of the NGC
5714 sextet as viewed through her 15-inch
Newtonian reflector. She didn't see NGC 5724,
the faintest member of the sextet.

(mag. 15.0). The final member of the
sextet, NGC 5724 (mag. 16.9), remained
invisible to me. Can you spot it?
NGC 5717, 5721, 5722, and 5723
are each about 500 million light-years
distant. NGC 5714 and 5724 are foreground galaxies 130 million and 260
million light-years away from us.
¢ Contributing Editor SUE FRENCH
wrote this column for the June 2013
issue of Sky & Telescope.

Stars, Clusters, and Galaxies in Boötes
δ Boo
Kangaroo
UGC 9242

ε Boo

Type

Mag(v)

Size/Sep

RA
15h

+33° 19′

Double star

3.6, 7.9

109″

Asterism

-

113′ × 53′

15h 00.9m

+33° 09′

Double star

2.6, 4.8

2.8″

14h 45.0m

+27° 04′

14h

05.5m

+28° 32′
+36° 14′

NGC 5466

Globular cluster

9.0

9.0′

NGC 5529

Flat galaxy

11.9

6.4′ × 0.7′

14h 15.6m

Flat galaxy

13.5

5.7′ × 0.3′

14h

Galaxy group

13.4-16.9

11.5′

UGC 9242
NGC 5714 Sextet

Dec.

15.5m

25.4m

+39° 32′

14h 38.5m

+46° 39′

Angular sizes and separations are from recent catalogs. Visually, an object's size is often smaller than
the cataloged value and varies according to the aperture and magnification of the viewing instrument.
Right ascension and declination are for equinox 2000.0.

56

JUNE 2 02 0 * SK Y & TELESCOPE

SLOA N DIGITA L SK Y SURV E Y (2)

Object



Sky & Telescope - June 2020

Table of Contents for the Digital Edition of Sky & Telescope - June 2020

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