NGC 6540

Wide field of view

18h 06m 08.5s; -27º 45' 55"

Discovered by: Friedrich Wilhelm Herschel (1738 - 1822)

Year of Discovery: 1784

Object Type: Globular cluster

Object Classification: I 1 p n

Constellation: Sagittarius

Visual Magnitude: 14.6

NGC 6537

18h 05m 13.04s -19º 50' 34.2"

Object Type: Planetary nebula

Object Classification: 2a(6)

Constellation: Sagittarius

Visual Magnitude: 11.6

Also Cataloged As: PK10+0.1, ESO 590-PN001

NGC 6531

Above - wide field; below - high magnification

18h 04m 13.4s; -22º 29' 24"

Discovered by: Charles Messier (1730 - 1817)

Year of Discovery:

Constellation: Sagittarius

Visual Magnitude: 5.9

Also Cataloged As: M21, Cr 363, Mel 188, Lund 806, ESO 521-SC019,
h 1993, GC 4367, OCL 26

NGC 6528

18h 04m 49.6s; -30º 03' 21"

Discovered by: Friedrich Wilhelm Herschel (1738 - 1822)

Year of Discovery: 1784

Object Type: Globular cluster

Object Classification: 5

Constellation: Sagittarius

Visual Magnitude: 9.6

Also Cataloged As: ESO 456-SC048, GCL 84, H II-200, h 3723, GC 4364

NGC 6530

18h 04m 31.0s; -24º 21' 29"

Discovered by: Giovanni Batista Hodierna (1597 - 1660)

Year of Discovery: 1654

Object Type: Cluster w/nebulosity

Object Classification: II 2 m n

Constellation: Sagittarius

Also Cataloged As: Cr 362, ESO 521-SC021, Lund 807, OCL 19, h 3725,
GC 4366