Basic object information
 Object name: NGC 6645
Object type: Open cluster
Magnitude: 8.5
Size: 15.0'
Number of stars: 40
Magnitude of brightest star: 12.0
Object classification: III 1 m
Description: Cl,pL,vRi,pC,st11..15
Notes: H VI 23

Catalog information
 RA (J2000.0): 18h 32m 36.0s
Dec (J2000.0): -16° 53' 00"

Constellation: Sagittarius

Observer: Iiro Sairanen
Obs. place: Ahola, Joutseno, Finland
Date/time: 16/17.8.2010 1:00
Telescope: Newton 300/1500 mm
Magn: 115x Filter: -
Field: 35' NE Lim.mag: 6.7
SQM: 20.85 (3) Seeing: 3
Visuality: II Height: 4°
Weather: +7°C, astronomical twilight  
Rather bland open cluster on the low SW horizon.