Discovered by Charles Messier on March 18, 1781.
On H II.118:
H II.118, 1784 April 8, compared to 6 Comae. Small. See note.
Note: Just following the 88. of the Connoissace des Temps.
Sweep 24 (April 3, 1826)
RA 12h 23m 23.5s, NPD 74d 38' 17" (1830.0).
B; L; E; bM to nucl; pos. (by diag) = 140deg.0 +/-; has a * just at its s f
extremity.
Bright; large; extended; brighter toward the middle to a nucleus; position
angle (by diag) = 140.0 deg +/-; has a star just at its south following [SE]
extremity.
Sweep 23 (April 1, 1826)
RA 12h 23m 24.0s, NPD 74d 38' 50" (1830.0).
vB; vL; E; gbM. Seen trough cloud.
Very bright; very large; extended. Seen trough cloud.
Sweep 419 (April 23, 1832)
RA 12h 23m 24.0s, NPD 74d 38' 50" (1830.0).
Viewed; mE in pos = 143 deg.4 by microm; psmbM; 7'l, 1'br.
Viewed; much extended in position angle = 143.4 deg [measured] by micrometer;
pretty suddenly much brighter toward the middle; 7' long, 1' broad.
Sweep 418 (April 21, 1832)
RA 12h 23m 24.0s, NPD 74d 37' 9": (1830.0).
A mere glimpse through a cloud
Sweep 421 (April 26, 1832)
RA 12h 23m 24.0s, NPD 74d 38' +/- (1830.0).
pos = 145 deg.3 by microm; 8'l, 1'br; svmbM; has a double star s f.
Position angle [of extension] = 145.3 deg [measured] by micrometer; 8' long,
1' broad; suddenly very much brighter toward the middle; has a double star
south following [to the SE].
[the following of WH's double nebula is non-existent H II.118 = GC 3050, given at RA 12:24:+, NPD=74:48:- (1860.0) in GC, described as F; S; f of D neb - faint; small; following of a double nebula - with the remark "(not observed by h [JH])"]
Last Modification: February 20, 2005