Discovered by Pierre Méchain on March 24, 1781.
Independently rediscovered by William Herschel on March 11, 1784.
[1811: PT Vol. 1811, p. 226-336; here p. 289]
Of treble, quadruple, and sextuple Nebulae.
If it was supposed that double nebulae at some distance from each other
would frequently be seen, it will now on the contrary be admitted that an
expectation of finding a great number of attracting centers in a nebulosity
of no great extent is not so probable; and accordingly observation has shewn
that greater combinations of nebular than those of the foregoing article
[Of double Nebulae at a greater Distance..] are less frequently to be seen.
The following list however contains 20 treble, 5 quadruple, and 1 sextuple
nebulae of this sort.
(*) See treble nebulae. [including H I.17 = M105].
Sweep 234 (February 19, 1830)
RA 10h 38m 50.5s, NPD 76d 32' 14":: (1830).
vB; R. The first of 3.
Very bright; round. The first of 3.
Sweep 240 (March, 1830)
RA 10h 38m 50.7s, NPD 76d 31' 24": (1830).
vB; L; R; psbM; 50". The first of 3. (Seen also in Sweep 2).
Very bright; Large; round; pretty suddenly brighter toward the middle; 50"
diameter. The first of 3. (Seen also in Sweep 2).
Last Modification: January 4, 2005