NGC 7354 (Hubble Legacy Archive Processing)
Again, I used data from the WF chips in combination with the PC chip data in order to create a slightly more complete view of a nebula. As usual, I’d still like if it were not cut off on the side, but you learn to take what you can get. :)
Red: hst_07501_09_wfpc2_f658n_pc_sci + hst_07501_09_wfpc2_f658n_wf_sci
Green: hst_07501_09_wfpc2_f555w_pc_sci + hst_07501_09_wfpc2_f555w_wf_sci
Blue: hst_08773_08_wfpc2_f502n_pc_sci + hst_07501_09_wfpc2_f502n_pc_sci + hst_08773_08_wfpc2_f502n_wf_sci
North is NOT up, it’s 8.7° counter-clockwise from up
NGC 7026 (Hubble Legacy Archive Processing)
It’s that time again. Another planetary nebula. I wish the left edge weren’t cut off. I did manage to complete the right side even though that doesn’t really help the composition. It’s ok, Hubble. I still love you.
Side note: One NGC number up from this is NGC 7027. The two planetaries are separated by about 5 degrees.
Red: hst_07501_08_wfpc2_f658n_pc_sci + hst_07501_08_wfpc2_f658n_wf_sci
Green: hst_07501_08_wfpc2_f555w_pc_sci + hst_07501_08_wfpc2_f555w_wf_sci
Blue: hst_07501_08_wfpc2_f502n_pc_sci + hst_07501_08_wfpc2_f502n_wf_sci
North is NOT up, it’s 73.3° clockwise from up.
NGC 6886 (Hubble Legacy Archive Processing)
My favorite thing about NGC 6886 is that its number designation is as palindromic as it the nebula itself. The central star is just barely visible with this processing. It’s easy to miss but it somehow shows up in the f555w data even though it’s invisible in the other two channels.
Corners are missing data.
North is up.
IC 4634 (Hubble Legacy Archive Processing)
Gotta love the symmetry of this one. I especially like the nearly perfectly smooth arcs formed at the top and bottom of the nebula. The bumpy clusters closer to the core remind me of clumps of salmon roe.
Here’s a Spacetelescope.org article about IC 4634.
Corners are missing data.
Red: hst_06856_02_wfpc2_f658n_pc_sci + hst_06856_02_wfpc2_f656n_pc_sci
Green: hst_06856_02_wfpc2_f547m_pc_sci + hst_06856_02_wfpc2_f487n_pc_sci
North is up
NGC 6326 (Hubble Legacy Archive Processing)
I combined data from the WF chips and the PC chip to create a wider view of NGC 6326. This one seems to lack any major symmetry. It also lacks the more clearly demarcated shells that other planetary nebulas have, which I sometimes wonder about. Why do some have them and others do not? I would like to see if the H-alpha (f658n, red) structures extend to the right or top of the nebula just as they do to the left and below but this is as far as the data goes.
Red: hst_08773_11_wfpc2_f658n_wf_sci + hst_08773_11_wfpc2_f658n_pc_sci
Green: hst_07501_14_wfpc2_f555w_wf_sci + hst_07501_14_wfpc2_f555w_pc_sci
Blue: hst_08773_11_wfpc2_f502n_wf_sci + hst_08773_11_wfpc2_f502n_pc_sci
North is NOT up, it’s 16° counter-clockwise from up.
NGC6741 is quite small but also quite bright and various details are easily discerned. It has a somewhat rectangular or parallelogram shape from our vantage point and the skinny, somewhat linear structure around the center has a curved shape implying that it may encircle the star all the way around though we can only see the side facing us.
Kaler mentions that the central star is unseen but it is clearly visible here and I do see it in the Hubble image he provided with his description. It is quite easily noticed in the f555w data even without sharpening. It is indeed invisible in the other two sets of data, f658n and f502n.
I don’t know who called it the Phantom Streak or why it is called that. Most small nebulas like this don’t receive common names. It’s a cool name though so we may as well go with it.
North is up.
Boomerang Nebula (Hubble Legacy Archive Processing)
There’s only one filter in the archive other than polarized filters so this is a monochrome image with a color gradient applied. It’s called the coldest known place in the universe (how does one measure this, anyway?) other than what some laboratory experiments have produced so blue may be more appropriate but I think fiery red is easier to see. Besides, blue has already been done.
Recent observations by ALMA revealed some new shapes in the nebula. You can see a picture and read about it here. I went searching the ALMA archive to see if I could look at some raw pictures myself but when I submitted the download request I was presented with a bunch of very large compressed files which all together were bigger than the free space I have on all my hard drives. Sheesh. Mission abort!
There is a small amount of missing data at the corners, mostly the lower left. I didn’t want to awkwardly crop it so I put in some flat colored shapes to match the background color and make it less distracting.
This view is zoomed 62.97% from actual pixels.
ACS/WFC F606W;CLEAR2L data was used.
North is up.
Calabash Nebula (Hubble Legacy Archive Processing)
Took a while to get this one done. This data is actually all red and infrared and mapped in a way that the shorter wavelengths are blue so it’s representative or false color—however you want to word that.
The blue outer shell is a very faint structure which barely shows up above the noise. I went ahead and used Photoshop’s noise reduction filter and a median filter on it. The median filter in particular is destructive and I haven’t ever used it on any Hubble images before. I decided since the shells were barely there anyway there wasn’t much to destroy.
The nebula itself is pretty neat. It’s also called the Rotten Egg because of its sulfur content. You don’t want to sniff it.
Blue-green screen layer for the blue shells: hst_08326_50_wfpc2_f656n_wf
North is NOT up, it’s 43.9° counter-clockwise from up
NGC 6565 (Hubble Legacy Archive Processing)
NGC 6565 looks to me like a miniature Ring Nebula. I’m rather fond of these nebulas with rather rainbow-like gradients from blue in the center to red at the perimeter.
I made an effort to reduce the size of the stars which would otherwise be bright green due to the green channel being f555w.
North is NOT up, it’s 45° clockwise from up
Egg Nebula (Hubble Legacy Archive Processing)
A couple of days I was yearning to see a closer version of the Cotton Candy Nebula and I think this image comes pretty close. It’s a completely different object but they seem very similar!
I had a bit of fun with it. There was enough data from three different proposals to combine into a pretty high resolution view of the object without using the polarized light data which results in a rainbow of representative colors.
There’s infrared represented by red so we can see the very thick dust wrapping around the nucleus and two optical wideband filters for the green and blue channels. So it’s sort of natural colors.
Note that only one channel of data is present for some parts of the image especially at the corners, which affects the stars. The Egg itself is almost completely covered by all three channels.
This view is zoomed 64.94% from actual pixels.
Red: hst_11580_05_wfc3_ir_f110w (a stack of exposures 01-05 omitting 03)
Green: hst_07423_a1_wfpc2_f606w_wf_sci + j8gh55plq_drz + j8gh55pnq_drz (all f606w filters)
North is up