Image Description and Details :

LDN 673 (Lynds’ Dark Nebula 673) is a highly fractured and very dense dark cloud complex about 600 light-years from Earth in the constellation Aquila. It is located near the center of the Aquila Rift, a great mass of dark molecular clouds along the summer Milky Way through the constellations Aquila, Serpens, and eastern Ophiuchus. This molecular cloud make the distant stars appear reddish, while the very dense LDN 673 nebula completely blocks the starlight.

In silhouette against the Milky Way’s faint starlight, LDN 673’s dusty molecular clouds likely contain raw material to form hundreds of thousands of stars. Visible indications of energetic outflows associated with young stars include the small red tinted nebulosity RNO 109 (GN 19.18.0) and several Herbig-Haro objects, like HH 32 near the young variable T-Tauri star V1352 (AS 353). These objects are signs of active star formation.

Telescope: ASA 10" Astrograph
Mount: ASA DDM60
Camera: Moravian G3-16200

4-panel mosaic with a total exposure time of 20h 30min


Copyright: Thomas Henne

Telescope / Mount / Guiding

ASA 10" Astrograph, ASA 3" Wynne-Corrector (focal length 910mm)
ASA DDM60, no guiding

Camera / Exposure

Moravian G3-16200, Astrodon filters

Lum 74 x 10min, R 24 x 5min bin2x2, G 24 x 5min bin2x2, B 27 x 5min bin2x2


Total Exposure time: 18h 35min

Processing

PixInsight, Fitswork, Photoshop

Notes

NGC 3642 is a spiral galaxy with an active galaxy core in constellation Ursa Major, about 75 Million light years away from our Milky Way. The galaxie belongs to the NGC 3642 group (also known as NGC 3610 group), a galaxy group that also includes the elliptical galaxies NGC 3610 and the lenticular galaxy NGC 3619.
The elliptical galaxy NGC 3613 and the barred spiral galaxy NGC 3625 are part of the NGC 3613 galaxy group. These two galaxy groups are considered associated.

Some of the galaxies, especially NGC 3619, seem to have one ore more tidal streams.

Copyright: Thomas Henne

The young open star cluster NGC 7129 is embedded in the bluish reflection nebula vdB 146. Due to it's shape the reflection nebula is called "Rosebud Nebula" and is located in the constellation Cepheus. The young stars have blown a large, oddly shaped bubble in the molecular cloud that once surrounded them at their birth. The rosy pink color comes from glowing dust grains on the surface of the bubble being heated by the intense light from the young stars within. Also some Herbig-Haro objects can be identified in the reflection nebula. Their shape and pinkish red color is characteristic of glowing hydrogen gas shocked by jets streaming away from newborn stars.


NGC 7142 is an open cluster about 6,200 light-years away. With an estimated age of 4.5 billion years, he is one of the oldest known open clusters.

The fine Halpha filaments on the left side of the image are part of the supernova remnant SNR 110.3 + 11.3.

Scope: ASA 10" Astrograph
Mount: ASA DDM60
Camera: Moravian G3-16200 with Astrodon LRGB and Halpha filters

Total exposure time: ~81h

Copyright: Thomas Henne