VdB 117, VdB 120, Sh2-40, Sh2-43, B 92, Sh2-44 (IC 4701), NGC 6596 a.o. in Sagittarius

  Size: 1800 px      
© Velimir Popov & Emil Ivanov 2017

This image shows an area of about 2° x 1.3° in the constellation Sagittarius. Several objects can be found here (see annotation mouseover). Among them are two tiny reflection nebulae VdB 117 and VdB 120. VdB 117 is a small reflection nebula in constellation Sagittarius.Located on the Sagittarius Arm at the distance of 1333 parsec, or about 4340 light years (accordind paralax measurements), it extends for about an arcminute at short angular distance from the emission nebula Sh2-43 , with which it has a compatible distance, and therefore a short distance from the OB association Sagittarius OB1. The star responsible for the illumination of VdB 17 is HD 167143, a blue giant of spectral class B3III and an apparent magnitude of 9.11. This image overlaps with the images of VdB 120-VdB 121 and VdB 114-VdB 116. Composite mosaic of these 3 images coud be seen below (check the mouseover):

Image details:


Center of field RA 18:14:39 (h:m:s)
Center of field DE -17:21:05 (deg:m:s)
Size 1.95 x 1.3 (deg)
Pixel scale: 2.99 (arcsec/pixel)
Orientation: Up is 69.4 degrees E of N
Charts and image details obtained from Astrometry.net
Optic(s): ASA 12" Astrograph @ f/3.6 (Newton)
Mount: ASA DDM85 Standard
Camera: SBIG STL 11000 M
Filters: Luminance, Red, Green, Blue, Astronomik filters
Dates/Times: 22, 23. Jul. 2017
Location: IRIDA Observatory, BG, longitude: E 24 44' 18", latitude: N 41 41' 42"
Exp. Details: L:6x10min., R:5x10 min, G:5x10 min, B:5x10 min, Bin 2, Total Exposure Time - 210 min (3h 30min).
More details: Dark and flat frames reduction
Processing: PixInsight / PS
Copyright: Velimir Popov and Emil Ivanov 2013 - 2017. All Rights Reserved
e-mail: info@irida-observatory.org
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