Celestial hemisphere:  Southern  ·  Constellation: Puppis (Pup)  ·  Contains:  HD60534  ·  HD60535  ·  HD60788  ·  HD60878  ·  HD60903  ·  HD60922  ·  HD60923  ·  HD60952  ·  HD61003  ·  HD61024  ·  HD61120  ·  HD61159  ·  LDN 1665  ·  LDN 1666  ·  n Pup
Getting plate-solving status, please wait...
Fest 1-7 : A beautiful starry field with small faint dark nebulae, Los_Calvos
Powered byPixInsight

Fest 1-7 : A beautiful starry field with small faint dark nebulae

Getting plate-solving status, please wait...
Fest 1-7 : A beautiful starry field with small faint dark nebulae, Los_Calvos
Powered byPixInsight

Fest 1-7 : A beautiful starry field with small faint dark nebulae

Equipment

Loading...

Acquisition details

Loading...

Description

To change it's not an extraordinary field but a nice multicolored starry field dotted with dark nebulae more tenuous than in the Northern Hemisphere and enhanced in the lower right by the beginning of a nebula in red emission.

Located in the constellation Puppis, FEST 1-7 is one of many dark nebulae discovered by the astronomers Johannes Feitzinger and Janine Stuwe and included in the FEST catalogue of dark nebulae, which was published in 1984. Located near the centre are two very small blue reflection nebulae collectively catalogued as Bran 51 A&B.Further to the right is the border of an emission nebula around the ISM Bran 46.
The Fest catalog collect the Dark nebulae and the globules berween the 240 and 360degree.

The overlapping regions between the POSS-Lynds survey and Fest catalog work were used to calibrate the opacity classes. This linkage secures the equality of the opacity classes in both surveys, in spite of the different limiting magnitudes of the photographic material. Lynds used the red and blue POSS prints and recorded only clouds visible on both the red and blue photographs. So some tenuous clouds, which may be transparent in the red, are not in- 'cluded.
The Fest catalog used the blue plates to obtain a greater completeness level. By comparing the clouds of the overlapping regions of the two surveys, we find that the cloud number per field is not influenced. The northern sky shows 2.5 times the obscuration of the southern hemisphere. This reflects the well-known fact that the visible Milky Way band changes its morphological appearance from north to south. The southern part appears more homogeneous as a consequence of the absence of the Great Northern Ritt in the Milky Way. This results in fewer clouds of high opacity, which are responsible for the ruggedness. Furthermore the southern part is much brighter, also a reason for greater homogeneity.
Besides their different opacities interstellar clouds show a bewildering variety of shapes and sizes. To take this fact into account, the Fest catalogue was supplemented by descriptive categories: tail of a cometary globule, worm track, dark filament, etc., and the classification scheme of van Bergh (1972). The four categories: amorphous cloud (a) ... sharpedged absorption (ö) may be understood in terms of a simple physical picture of the evolution of interstellar clouds. These classifications should reflect the evolutionary history of the dynamicalor thermal processes that once provoked the formation of the dark clouds and globules.

Comments

Sky plot

Sky plot

Histogram

Fest 1-7 : A beautiful starry field with small faint dark nebulae, Los_Calvos