Sky & Telescope - June 2020 - 20

Pinwheel Perfection

edge-ons were omitted. The Herschel 400 observing list was
designed for the 6-inch Newtonians that amateurs commonly used decades ago, but these days most serious deepsky observers opt for bigger instruments. I believe that the
Herschel 400 list should be updated so that it actually offers
the bright and best deep-sky objects beyond the Messiers for
Northern Hemisphere observers.

NGC 5204, a spiral 3.5° north of Mizar, is a more distant
member of the M101 Group. My 16-inch shows a large oval,
elongated by 3:1. It's only a very little bit brighter in the middle, with a very faint nucleus. There are knots or faint stars at
both ends of the long axis. Herschel classiﬁed it as Class IV,
which corresponds to his category of "Planetary Nebulae,
Stars with Burs, with Milky Way Chevelure, with Short Rays,

Galaxy-Hop Around M101
Object

Type

Mag(v)

Surface
Brightness

Size

RA

Dec.

Spiral

7.9

14.9

28.8′ × 26.9′

NGC 5461

H II region

14.0

-

1.1′ × 0.4′

14h 03.7m

+54° 19′

NGC 5462

H II region

13.5

-

1.5′ × 0.6′

14h 03.9m

+54° 22′

M101

14h

03.2m

+54° 21′

NGC 5455

H II region

13.0

-

0.5′ × 0.5′

14h

NGC 5450

H II region

13.0

-

1.0′ × 0.5′

14h 02.5m

+54° 16′

NGC 5447

H II region

13.5

-

1.0′ × 0.2′

14h 02.5m

+54° 17′

04.5m

+54° 24′
+54° 18′

03.0m

+54° 14′

NGC 5471

H II region

15.5

-

0.3′ × 0.3′

14h

NGC 5458

H II region

14.0

-

0.5′ × 0.3′

14h 03.2m

NGC 5453

H II region

13.8

-

0.3′ × 0.3′

14h

NGC 5449

H II region

14.0

-

1.0′ × 1.0′

14h 02.5m

+54° 20′

NGC 5451

H II region

14.0

-

0.4′ × 0.4′

14h 02.6m

+54° 22′

05.0m

+53° 39′

02.9m

+54° 18′

NGC 5474*

Spiral

10.8

14.0

4.7′ × 4.7′

14h

NGC 5477*

Spiral

14.0

14.7

1.7′ × 1.3′

14h 05.5m

+54° 28′

12.8

2.3′ × 1.7′

14h

04.7m

+54° 54′

07.2m

+55° 00′

NGC 5473

Lenticular

11.4

NGC 5485

Lenticular

11.4

12.9

2.3′ × 1.9′

14h

NGC 5486

Spiral

13.2

13.6

1.7′ × 1.0′

14h 07.4m

+55° 06′

06.8m

+55° 02′

NGC 5484

Elliptical

14.7

13.3

0.5′ × 0.5′

14h

PGC 50395

Lenticular

13.8

13.0

0.9′ × 0.6′

14h 07.7m

+54° 48′

13.9

5.8′ × 3.7′

14h

19.8m

+56° 44′

26.6m

+56° 35′

NGC 5585*

Spiral

10.7

NGC 5631

Lenticular

11.5

12.5

1.7′ × 1.7′

14h

NGC 5678

Spiral

11.3

13.0

3.3′ × 1.6′

14h 32.1m

+57° 55′

12.9

3.9′ × 0.7′

14h

00.7m

+55° 10′

02.2m

+55° 49′
+55° 44′

NGC 5422

Lenticular

11.9

NGC 5443

Barred spiral

12.3

13.2

2.7′ × 1.0′

14h

NGC 5475

Spiral

12.6

12.4

2.0′ × 0.5′

14h 05.2m

NGC 5204*

Spiral

11.3

14.1

5.0′ × 3.0′

13h

NGC 5109

Spiral

12.9

12.6

1.7′ × 0.5′

13h 20.9m

+57° 39′

UGC 8837*

Barred irregular

13.4

15.1

4.6′ × 1.2′

13h 54.7m

+53° 54′

54.5m

+54° 20′

29.6m

+58° 25′

NGC 5368

Spiral

13.0

12.3

0.9′ × 0.7′

13h

NGC 5238

Irregular

13.3

14.1

1.7′ × 1.4′

13h 34.7m

+51° 37′

12.7

0.7′ × 0.7′

13h

33.3m

+51° 29′

12.7

1.0′ × 0.9′

13h

36.1m

+51° 14′

NGC 5225
NGC 5250

Spiral
Lenticular

13.6
13.0

The asterisk denotes M101 Group members. Angular sizes 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.

20

JUNE 2 02 0 * SK Y & TELESCOPE
Sky & Telescope - June 2020

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