If you've read the April 2022 issue of Sky & Telescope and enjoyed Howard Banich's article on Markarian's Chain, you may be in search of tables of data for the Eastern and Western extensions of the Chain. You've come to the right place. You can also download the tables in PDF format here.
Western Extension
Object
Type
SB
Mag(v)
Size
Dist. (M l-y)
RA
Dec.
NGC 4305
Spiral
13.5
12.6
2.2′ × 1.2′
64.3
12h 22.1m
+12° 44′
NGC 4306
Barred lenticular
13.3
12.6
1.6′ × 1.3′
60
12h 22.1m
+12° 47′
NGC 4267
Barred lenticular
13.3
10.9
3.2′ × 3.0′
51.2
12h 19.8m
+12° 48′
IC 775
Barred lenticular
13.1
13.3
1.1′ × 0.8′
370
12h 18.9m
+12° 55′
NGC 4216
Spiral
12.8
10
8.1′ × 1.8′
59
12h 15.9m
+13° 09′
NGC 4206
Spiral
14
12.2
6.2′ × 1.0′
62.1
12h 15.3m
+13° 01′
NGC 4222
Spiral
13.7
13.3
3.3′ × 0.5′
64.2
12h 16.4m
+13° 18′
NGC 4193
Spiral
13
12.3
2.2′ × 1.0′
125
12h 13.9m
+13° 10′
NGC 4189
Spiral
13.1
11.7
2.4′ × 1.7′
84.2
12h 13.8m
+13° 26′
NGC 4168
Elliptical
13.2
11.2
2.8′ × 2.3′
102
12h 12.3m
+13° 12′
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.
Eastern Extension
Object
Type
SB
Mag(v)
Size
Dist. (M l-y)
RA
Dec.
M88/NGC 4501
Spiral
13
9.6
6.9′ × 3.7′
65.1
12h 32.0m
+14° 25′
NGC 4459
Lenticular
12.7
10.4
3.5′ × 2.7′
49.9
12h 29.0m
+13° 59′
NGC 4468
Lenticular
13.1
12.8
1.4′ × 1.1′
51.5
12h 29.5m
+14° 03′
NGC 4474
Lenticular
12.7
11.5
2.4′ × 1.4′
52.8
12h 29.9m
+14° 04′
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.
SUNSET: 
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