NGC 6690 (NGC 6689, UGC 11300) Galaxy in Draco

Located at: RA 18 hours 34 minutes 50 seconds, Dec +70 degrees 31 minutes 28 seconds

Size: 3.8' x 1.2' Magnitude: 13.1 blue Class: Sd? sp (SBcd HII)*

North is up

West to the right

Telescope:

 14.5" f5 Newtonian reflector

Camera:

 ST-8XME, self-guided, binned 1x1, temp -20c, camera control MaxIm DL 4.56

Image:

Lumicon Red filter, 650 minutes (65 x 10 minute subs), 06/8/10/11/12/13/14/2017; seeing 2.1-3.8 FWHM per CCDStack

Processing: CCDStack 2.94.6355.18107, Photoshop CS5.1
Location:

 Rolling Roof Observatory, Thousand Oaks, CA 91360 (+34d 13m 29s -118h 52m 20s)

Notes:* This faint NGC galaxy was a tough one ... it is in my 'short window' for imaging. That is, at this declination, objects 'set' into the protruding branch of the pine tree to my north. My imaging window this time of year is just over two hours, so I was only able to get 10 to 13 subs in each night. I was also keeping away from the nearly full moon the first few nights, as with NGC 6654.

From the NGC / IC Project:

Steve's Notes

NGC 6689 = NGC 6690 = UGC 11300 = MCG +12-17-026 = CGCG 340-050 = KAZ 210 = PGC 62077

18 34 50.0 +70 31 27

 

See observing notes for NGC 6690.

 

Heinrich d'Arrest discovered NGC 6689 on 22 Aug 1863 with the 11-inch refractor at Copenhagen.  His position and description (he measured the offset to mag 7.7 HD 172803 7' southeast) matches UGC 11300 = PGC 62077.  Lewis Swift independently rediscovered this galaxy twice in 1884 (V-86 and V-85), and this galaxy also is catalogued as NGC 6690.  So, NGC 6689 = NGC 6690.

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NGC 6690 = NGC 6689 = UGC 11300 = MCG +12-17-026 = CGCG 340-050 = KAZ 210 = PGC 62077

18 34 50.0 +70 31 27

V = 12.5;  Size 3.8'x1.3';  Surf Br = 14.0;  PA = 171d

 

17.5" (6/11/88): moderately bright, fairly large, very elongated NNW-SSE.  A mag 14 star is just off the west side 0.6' from center.  A brighter mag 13 star is east of the north tip and an extremely faint mag 15-15.5 star is involved at the NNW end.

 

Lewis Swift found NGC 6690 = Sw V-86 = Sw V-85 on 16 Aug 1884 and recorded "pF; L; R; bet 2 st."  His position is just east of the core of UGC 11300 and the two stars are southwest and northeast.  He found this galaxy on 31 Oct 1886, assumed it was new, and logged V-85 as "vF; pS; lE; nearly bet. 2 near st."  His second position is 2.5' too far northwest, although clearly applies to the same galaxy.  Dreyer combined the two Swift entries into NGC 6690.

 

Heinrich d'Arrest discovered this galaxy on 22 Aug 1863 with the 11-inch refractor at Copenhagen and listed it as #188 in his AN 1500 list.  His position (measured twice) is accurate and Dreyer also catalogued this galaxy as NGC 6689, despite the very similar positions.  So, NGC 6689 = NGC 6690.  UGC 11300 is usually identified as NGC 6690, although by d'Arrest's prior discovery it should be labeled NGC 6689.

 

Herbert Howe observed NGC 6690 in 1899-00 and reported "this is given as "R" in the NGC.  But it really has two faint wings stretching out north and south from the much brighter centre, making the nebula 1.5' long.  At its northern end is a star of mag 12."

 

* From NED.