VdB 62, VdB 63, LDN 1622, LDN 1621


12" ASA - LRGB

12" ASA - Annotated map

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© Velimir Popov & Emil Ivanov 2013

This star field is situated near the much more famous M78. The two dark nebulae (LDN 1621, smaller, near the left border and LDN 1622, much bigger near the center) are projected onto a complex and extensive emission nebulosity known as Barnard's Loop, inside the molecular cloud complex named Orion B. Both nebulae are believed to be 500 light years away, much closer than the bright red hydrogen nebulae that shine behind them from about 1,600 light years. Other objects on this image are VdB 62 (just right of LDN 1622) and VdB 63 (the smaller yellowish nebula below). Both are reflection nebulae. For clarity there is a mouseover, which shows the objects and their names.

There is another object that was initially not recognized. Finally we found it in a database of the planetary nebulae. It was described as “Cometary globule” with the designations as follows: PN-G: 205.4-11.7 Coordinates: 05:56:01.72 +01:13:24.00 Size: 2.7 arc min. It is clearly seen on DSS plates. Below you can find a magnified crop of this object compared with the corresponding DSS image.

The subframes of our image were acquired in a long period of time (between November 2012 and February 2013). Since beginning of December 2013 we had to rotate slightly the camera (in order to improve the balance), the orientation of the subs are different. This explains the double star spikes. The tiny lines at the top left are spikes from the 4.8 mag star 56 Ori, which has produced the slight greenish halo too (above VdB 62, near top border).

Object X

Image details:


Center of field RA 05:55:01 (h:m:s)
Center of field DE +01:42:25 (deg:m:s)
Size 1.56 x 1.08 (deg)
Pixel scale: 1.8 (arcsec/pixel)
Orientation: Up is 87.9 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: November 2012 - January 2013
Location: IRIDA Observatory, BG, longitude: E 24 44' 18", latitude: N 41 41' 42"
Exp. Details: L:29x10 min, R:11x10 min, G:12x10 min, B:13x10 min. Bin 1, Total 650 min (10:50 hrs)
More details: Dark and flat frames reduction
Processing: PixInsight / PS
Copyright: Velimir Popov and Emil Ivanov 2013. All Rights Reserved
e-mail: info@irida-observatory.org
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