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SNR G166.0+4.3



VRO 42.05.01 (G166.0+4.3) Supernova Remnant

RA = 5 hrs 23 min; Dec = 42 deg 55 min.

Date & Site:

Imaged over two nights on 10/12 and 10/13/2012; Palomar Mountain, CA

Conditions: moderate winds; 45-55 degrees; very good seeing


Telescope: Takahashi FSQ106 at F5 (fl= 530mm)
Mount: Losmandy G-11 with Gemini
Camera: ST-10XME; CFW10; externally guided


Exposures: 6 hrs of Ha (6 nm) and 45 min each RGB for a total of 8.25 hours.

This unusual supernova remnant in the constellation Auriga has two components. One component has the typical appearance of a shelltype supernova remnant (SNR); the other, which partly overlaps the shell, has an irregular outline, includes linear ridges of emission, and shows limb brightening. The shell componet of this SNR is seen to be breaking away from the higher density medium to a hotter lower density tunnel. Also cataloged as Sh2-224.

Located approximately 16,000 light years away.

Click here for more information on this unusual SNR http://www2.astro.psu.edu/xray/snr/vro.html

There is some debate in the scientific literature on whether this object is one or two supernova remnants. http://articles.adsabs.harvard.edu//full/1982ApJ...261L..41L/L000041.000.html

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