Remembering Earth-that-was
This post is to celebrate my new skill, annotating an image.
Here’s M106 and a bunch of visually smaller galaxies:
(I should mention that these images should be viewed on a larger screen.)
And, presto, here’s an annotated version showing the named galaxies:
This is SO nifty.
Almost at the left edge is NGC5198, an eliptical galaxy about 170 million light years away; the extreme bottom left corner has NGC5169. 160mly away. And the small needle along the left downward diagonal is IC4263 — 140mly away. There’s also a neat double star in the extreme lower right corner — HIP 65664 A & B.
The companion smudge of the Whirlpool has its own designation, NGC5194. If you maximally pixel-peep the area just above and to the right of NGC5194, the galaxy IC4277 is a barely discernible elongated smear:
M51 is about 23 million light years away. As best as I can find, IC4277 is about 10 times as far — say 230 million light years.
About 6 hours total exposure time over three nights with a 115mm telescope. Processed with PixInsight and GIMP.
The radio said that “All of Us are Dead” (Korean zombie film) is number one on Netflix, though when I looked a moment ago it seems to only be number two. I finished watching it a few days ago.
Zombie films in general seem a tired genre, but this one has a twist: a very small percentage of the population are relatively immune to the zombie virus, and, though they are infected, they are able to keep their mental faculties intact. Even more, they become physically superhuman, with incredible strength, greatly enhanced sensory acuity, and enormous recuperative powers. This tiny population of superhumans, the “halfbies”, also remain infectious.
However, the disease is apparently only transmitted via mingled bodily fluids (ie, chomping on a victim), and so it is possible for the halfbies and humans to be friends, though a halfbie could be overtaken by hunger, decide to eat a human, and thus produce another outbreak. A halfbie is a potentially horrifying monster, but also possibly a terribly lonely friend. At the end we are left with a cliffhanger balancing that uncertainty. I look forward to season two.
The sky here at Songbird Central suffers heavy pollution, both light pollution and chemical pollution. Astrophotography would be unsatisfying without filters to reduce the effects of that pollution.
I’ve forgotten exactly which filter it was I used with the first photo — I think the “Optolong L-eNhance”. A good general purpose filter. The image is dim, but if you look closely and carefully, there’s lots of sharp detail. A stack of 30 one minute exposures, for half an hour total.
The second photo was taken with the “Triad Ultra” filter, which emphasizes the light from nebulae, a stack of 13 three minute exposures and 17 five minute exposures — a little over two hours total. In this image the white light from the stars has been reduced, while the red light from the glowing gas areas is emphasized. The image is redder, overall, and there are many tiny reddish fuzzy blotches, which are nebulae within M33.
How does M33 really look? Photos are stories, not truth. If you were a lucky human with opportunity to look at M33 through a big enough telescope, you might see something like the first picture, but not the colors in the second. If you really got into it, you would recognize the overall shape of the galaxy, and you might even recognize details in the patterns of the stars.
[Edited to adjust the scale and other corrections.]
M101, the “Pinwheel Galaxy”. It has low surface brightness, and the sky at Songbird Observatory, San Francisco East Bay Hills, is almost always at least a little hazy, with an ever-present skyglow from the nearby cities. The results are always noisy –like an analog photos with lots of grain:
Further processing with PixInsight and Gimp lessens the obvious noise, but you also lose some of the delicate shading in the galaxy:
I can’t see this object (it seems so strange to use the word “object” to refer to an entire galaxy…) with my naked eye.
In fact, most nights I can’t make out more than a couple of constellations — if I didn’t use software to point the telescope, I would not be able to find M101.
How, then, do I even know this is M101 I photographed? I can compare it with the Hubble view.
Two nights ago the sky was clear and steady, and the telescope was working fairly well…