We’ve had far too many rainy days followed by isolation and the closure of astronomy parks and related facilities. Even if it cleared, we have nowhere to go. So here’s a quick reminder of the winter nebula that are leaving now not to be seen until next year. I wish I had time to do a mosaic and capture the whole nebula but I didn’t. It truly is a LARGE nebula. This image is 2.4 degrees across and could hold more than 18 full moons. (The moon varies between about 29′20″ – 34′6″ in size)
IC 1805 / Sharpless 190, more commonly known as the Heart Nebula, lies approximately 7,500 light years from Earth. This data set was comprised of 43x20min Ha, 23x20min O[III], and 24x20min S[II] for a total exposure time of 30 hours over several nights in November 2019.
We had a great clear spell 7/23 through 7/27 with only moderate lunar interference in the early hours of the morning. This is 14 hours of exposure divided equally across Hydrogen-alpha, Oxygen [III], and Sulfur[II] emission lines. Scope was an AP130GTX with Apogee U16 CCD on an AP1200GTO mount. Located outside Clinton, TN. The following are crops from the main image.
Finally, here is the nearly full frame image encompassing the whole area.
Due to a moisture breach of my camera causing frosting issues which caused me to throw out all but 4.5 hours of data out of 18 I figured I might as well post this as it’s not going to get much better. Image scale was 1.31 arcsec/pixel which seems to give fairly decent sampling for the average seeing here in East Tennessee. Imaging location just outside Clinton, TN with average SQM measurements ranging from 20.1 to 20.4 mag/arcsec^2.
I recently replaced the dome control electronics after the Foster Systems controller bit the dust and I replaced with a MaxDome II controller for rotation and shutter operation. It’s working flawlessly so far and I couldn’t be happier. I threw the 5″ refractor back in the observatory with the 16803 chipped camera for a widefield rig at 2.2 arcsec/pixel resolution. Drizzle processing yields better star shapes/sampling than the low resolution would suggest. Both images are cropped from the same image with 20.5 hours of total exposure time in the traditional Hubble Pallet.
I was the first one to arrive for the star party on Saturday night at Look Rock South. It’s a beautiful view to the south looking into the Smokies.
We definitely had some clouds for the beginning of the night with some sucker holes now and then. I was never able to get off a 20 minute shot without the clouds rushing in within 10 minutes…
But things finally started to clear up and the Milky Way really started to pop out.
Once it was cleared up I was off to take some test shots and validate the portable rig was ready for more serious projects. NGC 6820 AKA Sharpless SH 2-86 and all the surrounding emission and dark nebula has always been a favorite of mine. It’s located in Vulpecula not that far from M27, the Dumbbell Nebula. It reminds me of a less popular M16 with it’s gas and dust pillars and dark globules. Open cluster NGC 6823 resides in the midst of the nebula and is about 6,000 light years away.
We’re in Galaxy Season and without the 10″ RC I’ve instead focused on the 5″ refractor with a small pixel size camera to squeeze out some detail. Imaged from the backyard observatory in ~20.5 mag/arcsec^2 skies.