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SANDQVIST & LINDROOS (AKA SL 11)

DARK NEBULA IN LUPUS  (ra: 15:57.51 / dec -37:50.14)

 

 

July 2012, Arca de Noe - Rama Caída Mendoza, Argentina

 


 

DATA

TYPE: Dark Nebula

VISUAL MAGNITUDE: n/a

APPARENT DIAMETER: 40 x 5 arc minutes.

IMAGE FOV  approximately 120 x 90 arc minutes

 

IMAGE INFORMATION

SCOPE: TMB SS 92 working at f6 (roughly)

CAMERA: QSI 583 WS

GUIDING: LodeStar in Orion Short Tube 80/400 PHD Guiding

FILTERS: Baader LRGB Set

SKY CONDITIONS: Rural Skies with some street lights 70 meters away.

EXPOSURES: LRGB (60,30,30,30) for a total exposure time of 2 1/2 hours

PROCESSING: Images Plus / Photoshop CS2 - no darks applied.

 

OBJECT DESCRIPTION AND IMAGE SESSION

SL 11 stands for Swedish Astronomers Sandqvist & Lindroos who catalogued 42 Southern Dark nebulas in 1976 (*). Dark nebulas of this type are high concentrated dust and molecular gas that absorbs visible light coming form the star background. This are some of the coldest and isolated places in the Universe. Lupus provide some interesting patches of dark nebula. In this case SL 11 is not so often photographed. The FOV also includes bright star eta Lupi shining at magnitude 3.42 in the top / left corner and some distant galaxies in the middle low part of the image. PGC 170710; PGC 56360; PGC 56362 and at the right all alone PGC 89000. Such galaxies are very faint and had a relative small size put sill visible in better in the high resolution image.   

(*) Information provided by Sakib Rasool and also Published by Marco Lorenzi.