Andrew Cooper
May 12, 2018    Kaʻohe, Mauna Kea, HI (map)
20cm f/6 Newtonian, Cave Astrola @ 102x
Seeing: 8 Transparency: 7 Moon: 0%

The companion galaxy to M51, smaller, round, connected to the larger by a faint extension and about 5' north

Andrew Cooper
Apr 6, 2007    Hale Pohaku, HI (map)
15cm f/5 Newtonian, Primero @ 97x
Seeing: 8 Transparency: 7 Moon: 0%

Small, bright core, brighter than NGC5194, round with no other structure noted, connected to NGC5194 by a tidal tail of stars forming a glowing bridge, clearly interacting

Andrew Cooper
May 8, 2005    Caballo Loco Ranch, Pima Co., AZ (map)
46cm f/4.5 Deep Violet

The Whirlpool! or at least the companion, round, stellar nucleus, appears connected to the larger spiral

Rev. T.W. Webb
May 19, 1885    Hardwick, Herefordshire, England (map)
24cm Reflector

9-1/3 in. speculum showed plainly outer end of spiral and junction [from NGC5194] with smaller nebula.

― Celestial Objects for Common Telescopes, T. W. Webb, 1917

Drawings, descriptions, and CCD photos are copyright Andrew Cooper unless otherwise noted, no usage without permission.

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