NGC 6589, NGC 6590, IC 1283 - Complex Nebulosity in Sagittarius

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  12" ASA: LRGB 12" ASA: annotated map 12" ASA: LRGB crop    
  Size: 2000 px Size: 2000 px Size: 2000 px    
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© Velimir Popov & Emil Ivanov 2014
This nebula complex is located not far from the center of the galaxy. Numerous patches of dust partially obscure the light at visible wavelengths. The two bright blue clouds are NGC 6589 ( = IC 4690, Ced 157a, DG 149, VDB 118, LBN 46A, Gum 78A, ESO 590-14, Magakian 757) and NGC 6590 (= IC 4700, Ced 157b, DG 150, LBN 46B, VDB 119, Magakian 758). They surround two young blue stars, by whose light they are illuminated. The diffuse magenta cloud (IC 1283 or Sh2-37) is a complex HII region which absorbs the emissions from the nearby stars and releases them in the visible red light of excited hydrogen (HII). It is not quite easy to identify the objects in this image. This is due to the fact that there is enormous confusion concerning the numbering of these  objects.  The online database SIMBAD, for instance, identifies the nebula Sh 2-37 at the location of NGC 6590 (?). Furthermore, there is a double NGC/IC numbers of these objects (please see the annotated map). Some astronomers consider the two bright stars are part of a loose cluster known as NGC 6595, but other believe that the existence of this cluster is quite questionable. To get an idea of this confusion, just check this webpage.



Image details:


Center of field RA 18:17:13(h:m:s)
Center of field DE -19:45:32 (deg:m:s)
Size 57.2 x 43.1 (arcmin)
Pixel scale: 1.03 (arcsec/pixel)
Orientation: Up is -4.75 degrees E of N
Charts and image details obtained from
Optic(s): ASA 12" f 3,6 Astrograph (ASA)
Mount: ASA DDM85
Camera: FLI MicroLine 8300 CCD camera
Filters: Luminance, Red, Green, Blue, Astrodon filters
Dates/Times: 27 August 2014
Location: Namibia-TIVOLI ASTROFARM, S 23° 27' 40,9" / E 18° 01' 02,2"
Exp. Details: L:4x10min, R:4x10min, G:4x10min, 4:3x10min,, Bin1,
  Total Exposure Time - 160 min.
More details: Dark and flat frames reduction,
Processing: PixInsight / PS
Copyright: Velimir Popov and Emil Ivanov 2014. All Rights Reserved
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