Celestial hemisphere:  Northern  ·  Constellation: Cassiopeia (Cas)  ·  Contains:  LDN 1310
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Dobashi 3771 (Dark Nebula), Cluster [BDS2003], and Reflection/Emission Nebula, Alan Brunelle
Dobashi 3771 (Dark Nebula), Cluster [BDS2003], and Reflection/Emission Nebula, Alan Brunelle

Dobashi 3771 (Dark Nebula), Cluster [BDS2003], and Reflection/Emission Nebula

Getting plate-solving status, please wait...
Dobashi 3771 (Dark Nebula), Cluster [BDS2003], and Reflection/Emission Nebula, Alan Brunelle
Dobashi 3771 (Dark Nebula), Cluster [BDS2003], and Reflection/Emission Nebula, Alan Brunelle

Dobashi 3771 (Dark Nebula), Cluster [BDS2003], and Reflection/Emission Nebula

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Description

This is not new data, but I wanted to highlight this small reflection nebula that I captured in my last mosaic image
IC 63, IC 59... Mosaic.  With my rig, I cannot really get much resolution on this feature and thought that there might be some interest from those with larger apertures and longer focal length.   Maybe some nice structure will come out.

To sweeten the interest in this I include mouse over visual information from AllWISE (12 um) which shows that this feature appears to sit within a distinct large cloud feature, which is invisible in visible light images, and which rivals the dust found in IC 63 and IC 59.   I love looking at the visual data that specifically shows dust.  Dust often does not coincide with visual or narrow band emissions.  To me this helps me better understand the underlying structure and even the dynamics going on.  It is also important to remember that current theories of star formation, in the current universe epoch, it is thought that star formation requires this dust.  Otherwise the gases that make up the bulk of stars would never cool sufficiently to allow condensation under gravity.  I strongly encourage anyone who likes to use Aladin to call this area up and look at the fine images presented via WISE.  Unfortunately, the better long wave IR surveys mostly passed by this feature, though they do hit IC 63 and IC 59. 

Also included within the mouse over is data from 2MASS for Near IR data that shows cluster [BDS2003] 50, that otherwise would likely not be identified as a cluster at all.  The BDS2003 survey from Spitzer was an attempt to find otherwise buried clusters that could be forming and contain large hot stars.  Because I did not crop super small, the mouse over still makes the small cluster (visually) hard to see, so I would advise looking at the B revision at a larger scale.  Though the data breaks down quickly... 

The Dobashi designation itself appears to not be for either the reflection nebula component or the less dominant red (assumed H alpha signal, but would be nice to confirm).  Rather Dobashi designation is for a dark nebula.  This is seen in silhouette in my image.  However, it is pretty clear that this small dark nebula would be unnoticed if it were not for the illumination behind it.   BTW, I just got a H alpha filter and I would very much love to try this one, but after 2 meteorological bombs and one atmospheric river, I have little hope to do so until next year.  And that would be with luck!

I admit that this may not be the most dramatic nebula, but I do think that it nicely fits the Rarely Imaged DSOs group and with a long focal length and large aperature, this feature may be rather nice.

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    Dobashi 3771 (Dark Nebula), Cluster [BDS2003], and Reflection/Emission Nebula, Alan Brunelle
    Original
  • Dobashi 3771 (Dark Nebula), Cluster [BDS2003], and Reflection/Emission Nebula, Alan Brunelle
    B

B

Description: Overlay Image containing 2MASS and AllWISE data from Simbad.

The center of the 2MASS image has a slightly higher resolution image pasted in, which contains numerous stars not seen in my image. The wide image otherwise poorly demonstrates the nature of the cluster.

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Dobashi 3771 (Dark Nebula), Cluster [BDS2003], and Reflection/Emission Nebula, Alan Brunelle