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
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
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
New observations from 2019 (Prop 15953/Joel Kastner) reveal [Fe II] emission, shown here in pink, along the edges of the biopolar outflows of this young planetary nebula. I created this image specifically to clearly detail this discovery, deliberately arranging filters and assigning colors that would draw one's eyes to the new emission line data.
Hat tip to Bruce Balick for his original idea of removing the stars in the [Fe II] data. Through a strange series of emails I ended up "stealing" this idea, but he seemed happy about it when confession time came.
Data from the following proposals were used to create this image:
WFC3 ERO: Planetary Nebula
Young and Rapidly Evolving: a Panchromatic WFC3 Imaging Study of the Planetary Nebulae NGC 7027 and NGC 6302
Note that stars were manually removed from the F164N/[Fe II] data.
Red screen: F164N ([Fe II])
North is 35.20° clockwise from up.
Tags: HST Hubble planetary nebula butterfly NGC6302 bipolar outflow emission line gas stellar evolution
Gazing into deep this dusty maelstrom using near-infrared filters, Hubble reveals many stars and star-forming activities that might otherwise be obscured by dust. Strongly red spots indicate [Fe II] emission. There are only a few tiny splotches of those. Make of that what you will.
Data from the following proposal were used to create this image: Peering to the Heart of Massive Star Birth
Red: WFC3/IR F164N
Cyan: WFC3/IR F160W
Blue: WFC3/IR F110W
North is 45.51° counter-clockwise from up.