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IAAC Netastrocatalog: Observing Reports for M21
- (IAAC) Obj: M21 (NGC 6531) - Inst: 12.5" f/6.5 Cave equatorial Newtonian
- (IAAC) Obj: M21 - Inst: 6" Orion Dobsonian
- (IAAC) Obj: M21 - Inst: 6" Orion Dobsonian
- (IAAC) Obj: M80, M19, M62, M21 - Inst: 4.5" f/8 Equatorial Newtonian
- (IAAC) Obj: M5, M9, M19, M107, NGC6604, M16, M17, M18, M24, M23, M25, M21, M8, NGC6530, M28, M22, M26, NGC6712, M11 (Southern sky tour) - Inst: Astroscan 4.1" f/4.2 Widefield
- (IAAC) Obj: M 21 - Inst: Vixen 102 FL(f/9) on GP mount
- (IAAC) Obj: M21 - Inst: Celestar 8" SCT, fork mount
- (IAAC) Obj: M 21 (NGC 6531) - Inst: 10" F/10 SCT (Meade LX200)
- (IAAC) Obj: M21 - Inst: 120mm KONUS refractor, f/8.33, equatorial
- (IAAC) Obj: M !6, M17, M 24, M 25 , M 20, M8, M22, M6, M 7, M 21 - Inst: naked eye
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Hartmut Frommert
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