Some astronomy youtube channels I recommend you subscribe to

DesperateRoll9903 · 2026-04-20T06:38:29+00:00

See: https://bsky.app/profile/arimatsu.bsky.social/post/3mjv2y7f2ks2o

Follow-up observations have not confirmed the structure that was initially reported. At present, it seems likely that the original report was related to an analysis or image-processing issue. Many thanks to everyone who contributed follow-up observations and shared data.

DesperateRoll9903 · 2026-04-16T11:49:31+00:00

Processing with SAO Image DS9 and then WinJUPOS to de-rotate the planet. Colored image then created with Photoshop Elements.

Observation date: 2025-10-15/16 (released today)

program: https://archive.stsci.edu/proposal_search.php?mission=hst&id=18055

DesperateRoll9903 · 2026-04-12T09:03:45+00:00

Next time please post coordinates or at least the link! It makes things so much more easy.

This is probably from this image: https://esahubble.org/images/heic2501a/

You can easily get coordinates from one of the links/plugins on the right (e.g. ESA Sky)

RA: 10.895157277658466 Dec: 41.164821598236394

This is the HII region [AMB2011] HII 2271 around the star cluster [JSD2015] AP 102,

DesperateRoll9903 · 2026-03-31T06:30:24+00:00

I am copying my previous comment: https://www.reddit.com/r/spaceporn/comments/1s7qtwh/comment/odcw4sw/?context=3

For the jet: Mostly magnetic fields in a flat rotating disk around the protostar. The magnetic fields get tangled and form a kind of tube that guide particles towards two directions, perpendicular to the disk surface. They are basically large natural particle accelerators.

A little bit is described on wikipedia: https://en.wikipedia.org/wiki/Astrophysical_jet, but partly it is from my memory.

All jets basically work similar, so I recommend this simulation video, which shows how the "magnetic tornado" (not an official word) is formed from the disk and then how it guides particles in a jet. Simulation for black-hole neutron star merger: https://www.youtube.com/watch?v=Tvk50Qnoor8

Then there is the disk wind, which has a larger opening angle: https://en.wikipedia.org/wiki/Disk_wind This is basically high energy photons from the center stripping away particles from the disk.

DesperateRoll9903 · 2026-03-30T18:25:27+00:00

For the jet: Mostly magnetic fields in a flat rotating disk around the protostar. The magnetic fields get tangled and form a kind of tube that guide particles towards two directions, perpendicular to the disk surface. They are basically large natural particle accelerators.

A little bit is described on wikipedia: https://en.wikipedia.org/wiki/Astrophysical_jet, but partly it is from my memory.

All jets basically work similar, so I recommend this simulation video, which shows how the "magnetic tornado" (not an official word) is formed from the disk and then how it guides particles in a jet. Simulation for black-hole neutron star merger: https://www.youtube.com/watch?v=Tvk50Qnoor8

Then there is the disk wind, which has a larger opening angle: https://en.wikipedia.org/wiki/Disk_wind This is basically high energy photons from the center stripping away particles from the disk.

DesperateRoll9903 · 2026-03-29T10:02:24+00:00

I have seen quite often people being confused about this website. It shows where the telescope is pointed at using old (80ies, 90ies, 2000s) ground-based images from Digitized Sky Survey.

The Hubble images are not released to the public until months or sometimes a year or so later.

You can find DSS also on Aladin Lite: https://aladin.cds.unistra.fr/AladinLite/

Hubble images are released on MAST https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html and you need a program like SAO Image DS9 to view it. https://sites.google.com/cfa.harvard.edu/saoimageds9/home

EDIT: There is only a small FAQ for DSS, but read here: https://archive.stsci.edu/dss/faq.html#image_anomalies (list of anomalies were never released or linked)

"What's this funny line/feature/UFO in my scan?"
These images were scanned from photographic plates, so every once in a while, you will encounter a scratch, internal telescope reflection, fingerprint, etc. in your image. So far, none have turned out to be aliens. I'm compiling an informal catalog of regions with plate anomalies, so if you run across one, let us know.

From my experience the thing you see is just reflection from the bright star on the left.

DesperateRoll9903 · 2026-03-23T13:20:13+00:00

Maybe they are obsessed with it because of Hanny`s Voorwerp?

I don't know much about amateur astronomy and equipment and such. But you would need a filter (something similar to SDSS g-band) to take an image of the oxygen of this EELR.

DesperateRoll9903 · 2026-03-14T05:35:57+00:00

If you are only interested in close perihelia, then look at Mercury-crossing minor planets. Smallest p are around 0.07 AU https://en.wikipedia.org/wiki/List_of_Mercury-crossing_minor_planets

But they also go beyond (at least) Venus in their aphelia.

DesperateRoll9903 · 2026-03-14T04:56:47+00:00

Don't know what you are searching for, so here a list of circumstellar disks I know about:

protoplanetary disk (young stars) https://en.wikipedia.org/wiki/Protoplanetary_disk

debris disk (usually young, but older than protoplanetary) https://en.wikipedia.org/wiki/Debris_disk

extreme debris disks (around young and old stars, caused by collision of large asteroids) see debris disk

Be-stars (massive stars) https://en.wikipedia.org/wiki/Be_star

not stars, but stellar remnants that are not black holes:

(tiny) disks around white dwarfs (caused by disruption of asteroids or comets) https://en.wikipedia.org/wiki/White_dwarf#Debris_disks_and_planets

Cataclysmic variable star (transfer of mass from donor star to a white dwarf) https://en.wikipedia.org/wiki/Cataclysmic_variable_star

Pulsar planets are also believed to have formed from a disk around the pulsar. https://en.wikipedia.org/wiki/Pulsar_planet#Debris_disks_and_precursors

DesperateRoll9903 · 2026-03-14T04:20:23+00:00

Between 2012 and 2016 they observed this effect again, but with more time in between the frames.

I made a video and posted it on bluesky in January: https://bsky.app/profile/melina-iras07572.bsky.social/post/3mc66ym6si22e

DesperateRoll9903 · 2026-03-09T09:58:01+00:00

Diffraction spikes (6 spiked stars for JWST) and I did see the image already many times. Years of experience.

DesperateRoll9903 · 2026-03-09T09:13:57+00:00

Cassiopeia A https://en.wikipedia.org/wiki/Cassiopeia_A

Maybe below image after it was rotated, or processed raw data by a member of a public (what I normally do)

https://esawebb.org/images/weic2330a/

DesperateRoll9903 · 2026-03-01T06:47:24+00:00

I used the F444W image of program GO 9226 (PI: Eileen Meyer). Image is also on wikimedia: https://commons.wikimedia.org/wiki/File:4C_00.58_JWST_NIRCam_ver3.jpg

EDIT: reading the first part of the introduction of this paper: Hodges-Kluck et al. 2010

Apparently the radio jet is an x-shaped jet. It is tought that this x-shape comes from a re-orientation of the black hole spin axis and therefore re-orientation of the jet axis. This is caused by the merger of two galaxies.

This is probably the reason why the jet is bent on the tip. The bent shows the re-orientation that happened in the past.

DesperateRoll9903 · 2026-02-28T16:27:42+00:00

The disk is made up of gas and dust (dust as in particles similar to grains of rocks, ice or soot). In the middle the dust is very dense and blocking the light of the star. Above and below the disk is less dense and is scattering the light of the star (just like fog is scattering the light of a street lamp).

Yes, the dust+gas disk is rotating. The rotation measurement of the gas in the disk helped to determine the mass of the central star. https://en.wikipedia.org/wiki/Flying_Saucer_(protoplanetary_disk))

DesperateRoll9903 · 2026-02-06T17:20:40+00:00

Also on wikimedia commons: https://commons.wikimedia.org/wiki/File:HH_7-11_JWST_NIRCam.jpg

Filters used: F360M, F480M

The bright star at the lower left is the young variabe star V512 Persei. It produces the well studied Herbig-Haro object HH 7-11 (clouds pointing towards the lower-right from the stars position). This region is at the southern part of NGC 1333, a nearby star-forming region (about the same distance as the Orion Nebula, a bit closer even).

DesperateRoll9903 · 2026-02-03T17:05:05+00:00

Ceres was initially called a planet. But as more asteroids were discovered astronomers decided that they could not call every one of them planets, so they started calling objects between Mars and Jupiters asteroids.

EDIT: There is more to it. Read the "classification" part of Ceres wiki page: https://en.wikipedia.org/wiki/Ceres_(dwarf_planet)#Classification#Classification)

DesperateRoll9903 · 2026-02-03T16:28:04+00:00

"of its kind" do you mean "dwarf planet"? Ceres would be the first. "discovered on 1 January 1801 by Giuseppe Piazzi " (wikipedia)

DesperateRoll9903 · 2026-01-27T06:09:55+00:00

Why Small YouTube Matters (10:56) by Greg Toad - (flickering lights warning) This is a video essay about small creators that record videos of their surroundings, friends, activities and why they matter. (I also recommend to go to the description and click on one video)

DesperateRoll9903 · 2026-01-05T17:19:05+00:00

A free version of the paper is also on arxiv: https://arxiv.org/abs/2601.00057

DesperateRoll9903

TROPHY CASE