Observing Challenges for April

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Year Beginner Intermediate Advanced Lunar

Messier 98
Spiral galaxy in Coma Berenices
11th Magnitude
9.8’ x 2.8’ angular size

NGC 4315
Edge-on spiral in Coma Berenices
12.5 apparent magnitude
4.6’ x 1.1’ apparent size

IC 3355
Irregular Galaxy in Virgo
15th magnitude
1.1’ x 0.4’ apparent sized

Sinus Iridium
Massive flooded crater on the
edge of Mare Imbrium
249km in diameter


Messier 96
Spiral Galaxy in Leo
31M lightyears away
10.1 magnitude in brightness
7.6’x5.2’ apparent size

Spiral Galaxy in Leo
12th magnitude in brightness
2.7’x1.2’ apparent size

Leo II
Dwarf galaxy in Leo
Also catalogued as UGC 6253
12.6 magnitude in brightness
12’x11’ apparent size

Crater Reinhold
Impact crater in Mare Insularum
3km deep terraced walls
48km diameter


Messier 95
Also catalogued as NGC3351
32.6MLy away in Leo
11.4 apparent magnitude
3.1’ x 2.9’ apparent size

NGC 2905
Bright gas cloud in NGC2903
30.6Mly away in Leo
0.5’ in apparent size

Abell Galaxy Cluster 106
Also known as Hydra 1AGC10
Contains 6 galaxies of 14th magnitude within a 20’ field

Crater Piccolomini
Impact crater in the SE of the moon
88km in diameter
4.5km deep
South of Mare Nectaris



Messier 82
Irregular galaxy in Ursa Major
Known as the “Cigar Galaxy” because of its shape
9.2 Magnitude

Messier 109
Spiral Galaxy in Ursa Major
10.5 Magnitude
Just 0.6 ̊SE of Gamma Ursae Majoris

Galaxies Beyond M44
Whole pile of galaxies in the background of M44
NGC 2624, NGC2625, NGC 2637, NGC 2643, NGC2647, CGCG 89-56, CGCG 89-62, IC2388, UGC 4526
Range in brightness from 15.6 - 14.5 magnitude

Hortensius Dome Field
Lava Domes near the Crater Hortensius
Best observed on lunar days 9 and 22



Also known as Bode’s Galaxy
Messier 81 is a spiral galaxy in Ursa Major
Fairly bright at magnitude 6.9

Hickson Compact Galaxy Group 44
Galaxy group in Leo
NGC 3190 is the brightest at 12th Mag of four galaxies all brighter than 13th magnitude
How many can you find?

NGC 4284
Galaxy in Ursa Major
14 th Magnitude
Right near M40 and NGC4290

Messier on the Moon
Messier and Messier A
Named for the French comet hunter
8 km by 11 km and 11 km by 13 km
Note the unusual western rim of Messier A
Note the ejecta rays. How are they
different for the two craters?