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Judy Schmidt / 840 items

N 533 B 12.7K C 28 E Aug 17, 2020 F Aug 17, 2020
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Recent observations revealing the many-armed, beautiful spiral galaxy NGC 2336 as only Hubble can. The imagery used to create this image was taken in January 2020. Meanwhile, the Chandra X-ray Observatory is also tasked with looking at this galaxy, though I haven't looked into the details of that, yet.

Edit: Checked on CXO observations, and so far none yet, but I did notice that of the proposed 200 kilosecond time, they only gave Dr. Antoniou 50 ks. Ouch! Here's hoping that's enough.

Data from the following proposal was used to create this image:
Determining How X-ray Binary Populations Vary Through Time

Note there are a number of blank areas in the image where data were absent. I filled those with background-matched noise to make them visually unobtrusive. Some other areas also lack a full range of color, being only covered by 1-2 filters.

The pixel scale is 0.05 arcseconds per pixel.

Red: ACS/WFC F814W
Green: ACS/WFC F555W
Blue: ACS/WFC F435W

North is exactly to the right.

Tags:   HST Hubble spiral galaxy arms

N 22 B 2.5K C 1 E Aug 14, 2020 F Aug 13, 2020
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Not quite elliptical, not quite a spiral... it's lenticular. Love these subtle, ghostly galaxies. Very little dust or star formation to speak of, leaving the stellar structure plainly visible, though highly diffuse.

Data from the following ambitious proposal were used to create this image: Every Known Nearby Galaxy

Red: ACS/WFC F814W
Green: Pseudo
Blue: ACS/WFC F606W

Tags:   HST Hubble lenticular galaxy bar barred

N 23 B 2.3K C 0 E Aug 12, 2020 F Aug 12, 2020
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The same quasar seen in four separate instances due to the effect of the foreground mass intervening between the viewer and the quasar, causing distorted light paths, otherwise known as gravitational lensing.

Data from the following proposal were used to create this image:
H0, the stellar initial mass function, and other dark matters from a large sample of quadruply imaged quasars

Pixel scale is 0.0396 arcseconds per pixel.

WFC3/IR F160W was used as a "screen" layer for both the green and blue channels.

Red: WFC3/IR F160W
Green: WFC3/UVIS F814W
Blue: WFC3/UVIS F475X

North is up.

Tags:   HST Hubble quasar gravitational lens lensing Einstein ring

N 38 B 3.1K C 0 E Jul 31, 2020 F Jul 31, 2020
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2020 Aug 03: Phil Plait wrote a bit about this in his newsletter: badastronomy.substack.com/p/ban-241-climate-irony-goodbye...

Data originally collected by William C. Keel on 2020 July 24 using the Jacobus Kapteyn 1m telescope with SARA. He'd already done the work of flat fielding and stacking the exposures in r, v, and b bands, and asked if I'd like to take a shot at processing it further.

At first I was interested in the faint striations already visible in the tail, but later I discovered a kind of spiral emanating from the coma. Initial attempts weren't pretty, and had a lot of introduced artifacts. At some point I realized I could use the same kind of subtraction model I've used in the past for elliptical galaxies to take away excess light in a uniform pattern, which brings out structures that do not match that uniform pattern.

The spiral pattern was most apparent in the b band, mostly visible in the v band, but almost completely gone in the r band. Because of this, I went ahead and used color data from the normal, non-subtracted RVB image, and luminosity from just the model-subtracted b band.

I did use some rather heavy noise reduction in the darker parts of the image, but noise reduction was not necessary for the brighter parts. I tried to make the noise appear uniform. Some small columns of missing data created by a dead or hot pixel were cloned out to the lower right within the coma.

Future reference for self: The curve you need to start with for comets is 1/x (with many thanks to Bill for figuring this out for me)

Pixel scale is 0.34" per pixel

Luminosity: model-subtracted b band
Red: r band
Green: v band
Blue: b band

North is up.

Tags:   comet neowise C/2020 F3 William Keel Kapteyn coma tail spiral subtraction model SARA

N 339 B 10.7K C 17 E Jul 24, 2020 F Jul 25, 2020
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Some of the latest Jupiter data from the HST joint observation program for the Juno probe. Jupiter here in nearly RGB filters; the equatorial limb areas look a tad bluer than they normally would because the blue channel is a near-uv filter. This also makes the Great Red Spot and some of the cloud bands look a little redder.

Ganymede was in the frame, but hiding invisibly in Jupiter's shadow.

This image represents Jupiter as it would have appeared on 2019-07-21 at 14:05:03 UTC.

This image was made thanks to data collected for the following proposal:
Wide Field Coverage for Juno (WFCJ): Jupiter's 2D Wind Field and Cloud Structure

Red: WFC3/UVIS F631N (id9o45cwq)
Green: WFC3/UVIS F502N (id9o45cvq)
Blue: WFC3/UVIS F395N (id9o45cuq)

North is up.

Tags:   Jupiter HST Great Red Spot GRS Juno joint program Hubble


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