A Night Observing Planetary Nebula January 2nd, 2016

Well January 2nd, 2016 came and though a very cold night, it was a night that provided me the opportunity to use my 24" scope and compare it with my 17.5" dob.  The 24" usually sits in an observatory at our cabin that was built to house it because I am not up to transporting the 24" on my own.  However, I did bring the 24" down in a trailer to the house to do some adjustments over winter break.  I made those adjustments and loaded it and the 17.5 up and when the night was clear, cold but the forecast was for outstanding transparency I loaded up and headed out.

Luckily the roads were not too bad. Weight and being frozen helped me to get to one of my favorite spots. There was some mud and I had to clear out some of the snow on the ground to set up, but that took only about twenty extra minutes.  Set up went good and I had both scopes cooling by 4:00pm.  I ate my soup and got my observing clothes on, and then sat back and enjoyed the winter scene and wilderness around me.

As night came on, the coyotes came out and for around 15 minutes the 3 packs shared yipes, barks and calling to each other.  That is one thing about nature, even in the depth of winter you realize there is life all around you. Earlier, I had seen a very large raptor flying around nearby and it dove to capture something. It was a rabbit and it took to a nearby Juniper where, with binoculars, I could see that it was a bald eagle and it was having dinner at the rabbits expense.

Now as wonderful as this may seem, I want to point something out. The temperature at sunset, just after 5:00pm MST, was around 12 degrees F.  That meant with it being clear, it was going to get cold, REALLY cold.  I am dressed and prepared for the weather and I knew I could get out. In addition to clothing, food, hot drink and water, I had a battery jump start system for my vehicle should the battery suffer out here in the middle of nowhere. My point that I want to make is this. Do NOT head out in the boonies of wherever you live in the winter IF you do not know how to dress, have the proper clothing and have a vehicle that cannot only get you to your observing location, but can get you home at the end of the observing session from your dark site, remote observing location.  Finally, know how cold impacts your equipment because it does, regardless of what anyone may say. I don't need dew heaters for ninety percent of the year. After October 1st until June 1st I always carry my dew equipment and power source with me. Do you need to adjust your motions because the cold stiffens them? Then do that as part of a fall tune up project on your scope.  Bottom line though, do not put yourself and potentially others in a risky situation because you WANT to observe but are not prepared to observe.

My goal this night was to locate each object on my list (all planetary nebula), then to put each scope on them, observe and compare, and then sketch from the scope I felt had the best overall view for that evening. Thus as you look at my sketches, know that some will differ depending on the instrument used.

1. Abell 82 Planetary Nebula in the constellation of Cassiopeia. January 2nd, 2016, 07:05pm MST or 105 on 1/3/2016 UT; FR006 Jay's Site; Antoniadi II, clear, cold, 4 degrees F, no wind, steady skies, 6" of snow, 25 minutes to clear off the observing site.  24" & 17.5" dob, 17.5mm 5mm, 7mm, 10mm Pentax XW; 6mm, 10mm TeleVue Delos in 24" dob; Type I & II Paracorrs; DGM  NB & OIII Filters

This PN is very similar to M27 in Vulpecula. This PN lays SE to NW and has a similar football appearance but the dumbbell appearance is more prevalent overall. The northern end or north-west end is brighter and has a larger fan.  The southeast region is smaller, and has a higher surface brightness.  Nice PN to observe.

2. NGC 1535 Planetary Nebula in Eridanus, Cleopatra's Eye; January 2nd, 2016, 08:05pm MST or 205 UT on 1/3/16; FR006 Site Jay's; Antoniadi II; Clear, cold, no breeze; 17.5" and 24" dobs; 5mm, 7mm & 10mm Pentax XW's; Type II Paracorr; DGM NB & OIII filters.

Two shell planetary nebula in Eridanus, one of my favorite objects in the winter sky.  Both scopes how the central star and with the good transparency and seeing, I was able to crank magnification.  Darker bluish outer shell with the inner shell a brighter blue.  Beautiful view! When I took the photograph I modified the camera settings to capture more of the blue pastel chalk on the PN and the stars are a little blue as a result.

3. NGC 2022 Planetary Nebula in Orion; January 2nd 2016, 08:45pm MST or 245 UT on 1/3/16; FR006 Jay's Site; Antoniadi I, clear, cold, no wind or breeze, steady skies 4 degrees F; SQM 21.91; 17.5" & 24" Dob; 5mm, 7mm, 10mm Pentax XW; DGM NB & OIII Filters; Type II Paracorr; 27mm Panoptic as Finder (or 35mm Pan in 24").

Easy PN to pick up without the filters.  Small grayish egg shape PN with some hint of bluish tinge on the outer ring.  OIII is the best filter to enhance the PN.  PN is elongated SSW-NNW.  The surface brightness is both mottled and irregular on this PN.  The rim is brighter on the SE-SW sides.  NE and NW rim are dimmer. Central star is not visible.

4. NGC 2392 Planetary Nebula in Gemni, The Eskimo Nebula; January 2nd, 2016, 09:40pm MST or 0340 UT on 1/3/16; FR006 Jay's Site; Antoniadi I, clear, cold, steady skies with Sirius barely shimmering; 2 degrees F; SQM 21.91; 17.5" & 24" dob; 5mm, 7mm, 10mm Pentax XW; 27mm Panoptic & 35mm Panoptic as finders; Type II Paracorr; DGM NB & OIII filters;

Best view I have EVER had of this wonderful object.  The 24mm really shows how it can shine. The 17.5" I was very happy with, the 24mm brought just a touch more detail to this object.  Like views with both filters, no real preference, maybe a slight edge to the OIII for higher background contrast at the cost of merging the two shells. The UHC NB filter shows the two shells really well. Stuck with the UHC NB filter from DGM. Bluish in color, soft and grayish outer shell, some hint of brightening, with the inner shell brighter and has a slight separation.  Also could distinguish in the 24mm more brightening around the central star which showed itself in both scopes.

5. Abell 21 a Planetary Nebula in Gemini; January 2nd, 2016, 10:35pm MST or 435 UT on 1/3/16; FR006 Site 1; Antoniadi I; Clear, cold -2 degrees F; no wind, 6" of snow on ground minus observing area that I had cleared off; 17.5" & 24" dob; 5mm, 7mm, 10mm Pentax XW; 27mm & 35mm  Panoptic as finder eyepieces; Type II Paracorr; DGM NB & OIII filters.

This is a rather large and faint planetary nebula.  It shows itself better in the larger aperture, the 24" showed more detail than the 17.5" though the 17.5" wasn't bad.  This is not overly difficult but I feel the OIII filter is a must. Crescent shape and some hints of structure in the object at the higher magnification. The brightest part is the SE part that forms a crescent shape shell.  The interior glow near the center appears bright with the OIII filter.  Fun object to go after in the 17.5" which ended up being my favorite view. This PN is in Gemini though it is close to Canis Minor.

6. NGC 2440 Planetary Nebula in Puppis; January 2nd, 2016 11:10pm MST or 510 UT on 1/3/2016; FR006 Site Jay's; Antoniadi I, cold -4 degress F, clear, steady skies, 6 inches snow except in observing area; 17.5" & 24" dob; 5mm, 7mm, 10mm Pentax XW, 27mm & 35mm Panoptic as finder eyepieces; DGM NB & OIII filters;

This is the object where the 24" dob really showed its stuff. The details in the sketch come from the larger scope here. In the 17.5" it would be more of a rectangular shape with some details of brightness and extensions.  The PN has complex details with it, and is in truth in two halves.  One half extends upward with the western side is brighter.  The core region is much brighter than the rest of the PN and outer regions. I believe I made a cross on the top of the bottom on the core region and it should really be just on the bottom part of the sketch.  Overall, I LOVE this object with high magnification with a scope of 16" or better. 20" will bring out more detail, but both ranges are enjoyable with this object.

I didn't state this but one thing I wanted to do this night was to compare the view from my 17.5" and 24" dobs.  I did this with the PN's and I have to state and yes, there are times when the 24" really enhances the detail views of an object, say on NGC 2440.  However on other objects the increase in detail is slight, except on faint objects. One thing I notices is that if you are going to use high aperture, then you should have excellent observing skills to maximize your views.  I enjoy my 24" but I won't be taking it in the field for a long time. It was just too much scope for me. The 17.5" was easy to set up, easy to take down and worked in my opinion as well as the 24".  The 24" though probably a slightly better scope, for me, is not one I can use or want to use in the field. It is back in its observatory now, and I will have to decide if I want to keep it there for use when I am at the cabin, or if I should sell it and use that to pay for something else.  Knowing me, I'll keep it and use it when I am there.  It will give me a reason to go there more.

Overall this was a very cold night, but a great night. I never got cold, my observing clothing serves itself well and I enjoyed myself. By 11:30pm though I packed up and drove out.  I had a couple of fun times coming in and coming out, especially hauling a trailer. No problem though, just steady and good off road driving made it through.  I was glad to get home, to unload and go to bed. I was tired, as I had been very sick over Christmas and took in my rest that night with a good feeling for a good night of observing. I also knew that if I hadn't gone this night, it wasn't going to happen with the forecast and I can only hope come February, the weather has improved, the clouds are gone and the snow in the valley is melted.  Again, a great night and I also discovered that I think from now on, I will have about 12 to 15 objects selected and focus on just observing those objects, and sketching them. It made for a wonderful evening and glad I could share it with a good observing friend.  Stay warm, stay safe and keep enjoy the wonders of our winter sky!

No comments:

Post a Comment