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NGC 6793 (15,708 of 18,816)

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NGC 6793

NGC 6793, C 1921+220, COCD 461, VIII 81, h 2039, GC 4493

RA: 19h 23m 12s
Dec: +22° 08′ 0″

Con: Vulpecula
Ch: MSA:1196, U2:161, SA:8

Ref: SIMBAD, DAML02, Archinal&Hynes (2003)

(reference key)

Type: open cluster, 32p

Mag: B=?, V=?

Size: 6′
PA: ?

Historical observations

William Herschel (c.1784)

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."

Published comments

Roslund, C. (1960)

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."

Sulentic & Tifft (1973)

The RNGC (Sulentic and Tifft 1973) notes that this is a open cluster.

Modern observations

Brian Skiff

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+.

Contemporary observations

Magda Streicher

2006 July 18

Alldays

12-inch f/10 SCT (76x, 218x)

Conditions: Good

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.

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