NGC 6939

open cluster NGC 6939 (catalog)
Cr 423 •Mel 231 •OCL 217 •Raab 144 •Lund 960 •
Position (epoch J2000)
Constellation	Cepheus
Position	Ra 20:31:30.1 Dec +60:39:44
DSS images	10' · 20' · 30' · 45' · 1°
Appearance
Galaxy NGC 6946 (left) and open cluster NGC 6939 (right) Photo by André Hartmann, PN-203/800, 3 June 2011, Berlin
Apparent mag.	7.8
Size	7 '
Class	II 1 r
Stars	80 stars Brightest star: 11.9m
Dreyer's description	Cl pL eRi pCM st 11...16
Other
Notes
List:Open clusters in Cepheus
Map: RA 20, DEC 63.75 •

NGC 6939 is an open cluster in Cepheus.

Appearance

Telescopes 71mm - 100mm (2.8" - 3.9"), binoculars 51mm - 70mm

• (hr)NGC 6939 with 80mm f/5 refractor, 16x, 44x by Ante Perković (SEEN, Oct 31 2011, LM=6.2)  
• NGC 6939 observation by Paul Kemp (Southern Sentinel) with 80mm Stellarvue Refractor (22nd May & 23rd May 2004)  
• (IAAC) Obj: NGC 6946, NGC 6939 - Inst: 3.5" (9cm) ecuatorial refractor  
• NGC 6939 and NGC 6946 observation and sketch by Rony De Laet with TS Marine 15x70 binoculars  

Telescopes 101mm - 141mm (4" - 5.5"), binoculars 71mm - 100mm

• (IAAC) Obj: NGC 6939 - Inst: TV-102 (102mm f/8.6 APO refractor)  
• (hr)NGC 6939 with 4.5" (114mm) f/8 homemade dobson (babydob) by Ante Perković (SEEN, Dec 13 2003, LM=5.6)  
• (hr)NGC 6939 with 4.5" (114mm) f/8 homemade dobson (babydob) by Ante Perković (SEEN, Sep 10 2004, LM=6.1)  
• (hr)NGC 6939 with 25x100 binoculars by Ante Perković (SEEN, May 01 2005, LM=6.3)  

Telescopes 141mm - 177mm (5.6" - 6.9")

• (hr)NGC 6939 with 6" (150mm) f/5 homemade dobson (Olio) by Ante Perković (SEEN, Sep 10 2004, LM=6.1)  
• (IAAC) Obj: NGC 6939 - Inst: Orion 6" Dob  
• NGC 6939 observation by Brian Rachford with 6" f/8 Newtonian on equatorial mount (SEEN)  
• Cepheus by Steve Coe - NGC 6939 with 6" f/6 and 13" f/5.6  

Telescopes 178mm - 234mm (7" - 9.2")

• NGC 6939 observation by Olivier Van Aelst @ deepskylog.be (with Celestron Advanced 200mm)  
• NGC 6939 observation and sketch by Jaakko Saloranta with 8" Orion DSE @ 122x  
• NGC 6939 observation by Jeff Burton (x.astrogeek.org) with Meade LX200GPS 203mm SCT 
• NGC 6939 observation by Jeff Burton (x.astrogeek.org) with Meade LX200GPS 203mm SCT 
• NGC 6939 and NGC 6946 observation and sketch by Jere Kahanpää with Newton 205/1000  
• (hr)NGC 6939 with 8" (203mm) f/6 GSO dobson (Betsy) by Vedran Vrhovac (SEEN, Jul 16 2006, LM=5.8)  

Telescopes 235mm - 305mm (9.25" - 12")

• (IAAC) Obj: NGC 6939 - Inst: 10" F/5.6 Dobsonian  
• NGC 6939 observation by Tom Polakis with 10" and 13"  
• NGC 6939 observation and sketch by Iiro Sairanen with Newton 300/1500mm  

Telescopes 306mm - 381mm (12.1" - 15")

• (IAAC) Obj: NGC 6939 - Inst: 14.5" dob 1580 fl  

Telescopes above 15"

• NGC 6939 observation by Olivier Van Aelst @ deepskylog.be (with Obsession 18" (457 mm))  
• NGC 6939 observation by Peter Henderickx @ deepskylog.be (with 22" Dobson (560 mm))