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RA: 19h 23m 12s
Dec: +22° 08′ 0″
Ch: MSA:1196, U2:161, SA:8
Ref: SIMBAD, DAML02, Archinal&Hynes (2003)
Type: open cluster, 32p
Mag: B=?, V=?
Synonyms: H VIII-081
Discovered in 1789 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "a scattered cluster of considerably large stars, iF, pretty rich, above 15' in extent."
Roslund, C. (1960) Remarks on Some New and Some Known Galactic Clusters. PASP, 72(426), 205. [1960PASP...72..205R]
"The brightest star is an A0 V star of the 9th magnitude, and there are about 15 stars on the main sequence down to type A8."
The RNGC (Sulentic and Tifft 1973) notes that this is a open cluster.
POSS: SAO 87129 (mv7.9, B8.5V) ~10' W of cl. pair in triangle is merged:
m10,12; 8"; 50. triangle ~2' long. quadrilateral ~@' SSW of
triangle is ~45" across. all stars in these two figures m10-12.
obvious part of cl on O print ~10' diam.
WDS: triangle pair = ADS12385: 10.5,11.5; 8".3; 45 (1910).
15cm - straggly 30' diam; 20 *s incl m8 on W & triangle nr center.
- mod consp in fld, but still looks like absorption hole in Milky Way.
15'-17' diam outlined by incomplete circle of *s; consp arc of many
m12-14 *s on S perimeter. m8 * on W edge. inside this rough circle is
sm triangular clump in center ~3' on-a-side w/a N-S base facing W. NW
apex * is dbl: 10.5,11.7; 3"; 35. this clump is on W side of N-S bar of
*s crossing lgr circle. at 80x 75 *s counted w/in circle. rel dk area
NE. BS, 5Sep1989, Anderson Mesa.
25cm - 30' diam w/m8 * on W wide. unconcen w/triangle (incl a pair) and fntr
square in densest part. 45 *S counted m9+.
12-inch f/10 SCT (76x, 218x)
The whole field of view is dotted with a multitude of magnitude stars in curly shapes 12" – 76x). The most prominent string is situated on the eastern side of the cluster and runs out in a graceful swing to the north (12" – 218x). A few 8magnitude stars cuddles close together to form the tight middle section.
The Messier objects
The Bennett objects
The Caldwell list
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