Aleksey Shipilëv
@shipilev.bsky.social
In love-hate relationship with machines. Currently: OpenJDK, AWS. "Trust me, it's really me" backlink: https://shipilev.net/#social
100 Megapixel Moon (Trial Run): Verified that my new (second-hand) EdgeHD 8 can be mosaic-ed without much hassle. Once seeing improves, and collimation tools arrive, this would be extra awesome.
app.astrobin.com/u/shade?i=l6...
app.astrobin.com/u/shade?i=l6...
100 Megapixel Moon Mosaics (Trial Run) - AstroBin
First planetary light for second-hand EdgeHD 8”.Trial run:Mosaics assembly check: 21 panel mosaics to check panels are aligned well. And indeed it is! EdgeHD 8 field is very flat, on par with my FRA 5...
app.astrobin.com
December 31, 2025 at 4:31 PM
100 Megapixel Moon (Trial Run): Verified that my new (second-hand) EdgeHD 8 can be mosaic-ed without much hassle. Once seeing improves, and collimation tools arrive, this would be extra awesome.
app.astrobin.com/u/shade?i=l6...
app.astrobin.com/u/shade?i=l6...
How can you make sure that your USB SSD backup is intact after messing with hardware settings? Well, if you do ZFS backups, then you just plug the drive into the fastest port and scrub all that 4 TB of data in 1.5 hours.
December 29, 2025 at 3:40 PM
How can you make sure that your USB SSD backup is intact after messing with hardware settings? Well, if you do ZFS backups, then you just plug the drive into the fastest port and scrub all that 4 TB of data in 1.5 hours.
USB bridges continue to be a funky mess. Salvaged my 2TB Samsung T7 Shield write performance by enabling TRIM via SCSI provisioning_mode=unmap, as described on Arch Linux wiki: wiki.archlinux.org/title/Solid_.... Used to write at 2 MB/sec, now writes at full speed.
Solid state drive - ArchWiki
wiki.archlinux.org
December 29, 2025 at 3:03 PM
USB bridges continue to be a funky mess. Salvaged my 2TB Samsung T7 Shield write performance by enabling TRIM via SCSI provisioning_mode=unmap, as described on Arch Linux wiki: wiki.archlinux.org/title/Solid_.... Used to write at 2 MB/sec, now writes at full speed.
Today and only today there is a prediction of not one, but *two* half-Moons during the day! Do not miss out on this! Also, grab a cup to condense all that 100% humidity while you are outside.
December 27, 2025 at 9:54 AM
Today and only today there is a prediction of not one, but *two* half-Moons during the day! Do not miss out on this! Also, grab a cup to condense all that 100% humidity while you are outside.
Also, my new desktop background, courtesy of Hubble Space Telescope Heritage data archives. app.astrobin.com/i/x3a2tt
Hubble Space Telescope Heritage: Veil Nebula - AstroBin
This image is re-processed from the Hubble Space Telescope Heritage data:https://archive.stsci.edu/prepds/heritage/veil/https://archive.stsci.edu/pub/hlsp/heritage/veil/The files available there are a...
app.astrobin.com
December 26, 2025 at 8:29 AM
Also, my new desktop background, courtesy of Hubble Space Telescope Heritage data archives. app.astrobin.com/i/x3a2tt
Andromeda Galaxy last night. Going outside in -7°C for a few hours to acquire data really tests how much do you like a hobby. app.astrobin.com/i/152ckf
M31 (Andromeda Galaxy) - AstroBin
Shot from a relatively bright city center in freezing temperatures.
app.astrobin.com
December 26, 2025 at 8:26 AM
Andromeda Galaxy last night. Going outside in -7°C for a few hours to acquire data really tests how much do you like a hobby. app.astrobin.com/i/152ckf
Of course you can take out all C, C++, Java, JavaScript, Python lines of code out of the codebase in 5...10 years. It is even easier than it looks. You just need to shut down every service that is related to business in any way. Done! Time to collect that breakthrough bonus.
December 24, 2025 at 1:07 PM
Of course you can take out all C, C++, Java, JavaScript, Python lines of code out of the codebase in 5...10 years. It is even easier than it looks. You just need to shut down every service that is related to business in any way. Done! Time to collect that breakthrough bonus.
Periodic reminder that archive.org is awesome and deserves our donations. It also routinely hosts BitTorrent files for their data, which is useful if you want to donate some bandwidth as well. Take this link as the example: archive.org/details/insi...
December 23, 2025 at 7:00 AM
Periodic reminder that archive.org is awesome and deserves our donations. It also routinely hosts BitTorrent files for their data, which is useful if you want to donate some bandwidth as well. Take this link as the example: archive.org/details/insi...
That feeling when you had the regular update script running at one of your public facing servers, but you also forgot to reboot it for 3.5 years. I am sure nothing bad is going to happen if I do it now, 2 days before NY break starts.
December 22, 2025 at 8:55 AM
That feeling when you had the regular update script running at one of your public facing servers, but you also forgot to reboot it for 3.5 years. I am sure nothing bad is going to happen if I do it now, 2 days before NY break starts.
The moment our hero realizes that "artificial stars" used for collimating telescopes in amateur astronomy are just 50μm fiber fed by a light source, and that he has a lot of fiber cables like that just waiting to be used.
December 21, 2025 at 9:51 AM
The moment our hero realizes that "artificial stars" used for collimating telescopes in amateur astronomy are just 50μm fiber fed by a light source, and that he has a lot of fiber cables like that just waiting to be used.
A new large-ish aperture light bucket has arrived. A second-hand OTA, and I love astrophotographer community for this: they keep their gear in usable/resellable quality for years. Of course, I had some of my own additions right away.
December 19, 2025 at 7:20 PM
A new large-ish aperture light bucket has arrived. A second-hand OTA, and I love astrophotographer community for this: they keep their gear in usable/resellable quality for years. Of course, I had some of my own additions right away.
Hubble data archive is the good source for excellent data to work out astrophotography post-processing workflows. Wanted to try HaRGB combination ahead of going out and acquiring your own data? You can!
December 11, 2025 at 8:17 AM
Hubble data archive is the good source for excellent data to work out astrophotography post-processing workflows. Wanted to try HaRGB combination ahead of going out and acquiring your own data? You can!
Finally the new optical train has no visible issues. No OAG prism shadowing, no vignetting, no guiding problems. Put the OTA on the mount and start shooting. Yay! Now to wait for clear moonless nights to gather hours of clean data. app.astrobin.com/i/e5eily
Heart Nebula (IC 1805); 2600MC First Light; 20 Minute Test Shot - AstroBin
First light for ASI 2600MC with dual-narrowband filter from bright city center. This is a test shot to confirm the optical train is assembled correctly, framing routines work, focusing routines work, ...
app.astrobin.com
December 3, 2025 at 7:25 AM
Finally the new optical train has no visible issues. No OAG prism shadowing, no vignetting, no guiding problems. Put the OTA on the mount and start shooting. Yay! Now to wait for clear moonless nights to gather hours of clean data. app.astrobin.com/i/e5eily
A lot of times when I fix a small corner-case bug somewhere in OpenJDK, there are people coming in and saying "Some our prod hosts went down with exactly these symptoms, we need this fix now". Happens way too often for a platform that allegedly no one uses anymore. /s
December 2, 2025 at 11:18 AM
A lot of times when I fix a small corner-case bug somewhere in OpenJDK, there are people coming in and saying "Some our prod hosts went down with exactly these symptoms, we need this fix now". Happens way too often for a platform that allegedly no one uses anymore. /s
Breaking news, nobody have seen it yet: recent X-class solar flare and 3I/ATLAS comet are interacting heavily, making the OAG prism in my imaging train slipping into larger APS-C sensor field of view. <goddammit.jpg>
December 2, 2025 at 6:36 AM
Breaking news, nobody have seen it yet: recent X-class solar flare and 3I/ATLAS comet are interacting heavily, making the OAG prism in my imaging train slipping into larger APS-C sensor field of view. <goddammit.jpg>
RepairCafe: Saturday, Nov 29, 11:00..15:00 at Potsdam SLB. Come bring your curiosity and your broken devices. We can tinker together, maybe successfully, maybe not, but it should be fun either way. We speak German, English, Russian.
November 29, 2025 at 6:59 AM
RepairCafe: Saturday, Nov 29, 11:00..15:00 at Potsdam SLB. Come bring your curiosity and your broken devices. We can tinker together, maybe successfully, maybe not, but it should be fun either way. We speak German, English, Russian.
Finally a government project to unite the humanity.
www.whitehouse.gov/presidential...
www.whitehouse.gov/presidential...
November 26, 2025 at 11:27 AM
Finally a government project to unite the humanity.
www.whitehouse.gov/presidential...
www.whitehouse.gov/presidential...
Make sure your SSD drives are fully charged! (Not a technical advice. Consult with a specialist before plugging your devices to random USB ports.)
November 26, 2025 at 9:02 AM
Make sure your SSD drives are fully charged! (Not a technical advice. Consult with a specialist before plugging your devices to random USB ports.)
The "in and out, 20 minute adventure" test shots from allegedly Bortle 5 place already look promising, without even trying with doing everything accurately. Andromeda: app.astrobin.com/i/4gkx7r, Triangulum: app.astrobin.com/i/n9k63f, Pleiades: app.astrobin.com/i/pok45a
November 22, 2025 at 8:06 AM
The "in and out, 20 minute adventure" test shots from allegedly Bortle 5 place already look promising, without even trying with doing everything accurately. Andromeda: app.astrobin.com/i/4gkx7r, Triangulum: app.astrobin.com/i/n9k63f, Pleiades: app.astrobin.com/i/pok45a
Went for astrophoto night in -3°C. Put multiple dew heaters on the scope, carried air-tight bags with desiccant pouches, etc. Thought it through, right? Ha, no, kept scraping off frost from my dedicated laptop screen, literal layers of it. Never a dull moment in this hobby.
November 21, 2025 at 9:50 PM
Went for astrophoto night in -3°C. Put multiple dew heaters on the scope, carried air-tight bags with desiccant pouches, etc. Thought it through, right? Ha, no, kept scraping off frost from my dedicated laptop screen, literal layers of it. Never a dull moment in this hobby.
Junior developers argue how language design impacts business. Senior developers argue how platform experience impacts business. Principal developers know their systems are about three system bugs away from massive failure, and the one they look at right now is one of those three.
November 19, 2025 at 8:19 AM
Junior developers argue how language design impacts business. Senior developers argue how platform experience impacts business. Principal developers know their systems are about three system bugs away from massive failure, and the one they look at right now is one of those three.
Reminder: The bleeding edge JDK builds that are available at builds.shipilev.net, are also available as Docker images: hub.docker.com/r/shipilev/o... -- useful to track down JDK bugs. There are fastdebug builds too.
November 11, 2025 at 8:21 AM
Reminder: The bleeding edge JDK builds that are available at builds.shipilev.net, are also available as Docker images: hub.docker.com/r/shipilev/o... -- useful to track down JDK bugs. There are fastdebug builds too.
Some day most telescope manufacturers would realize that the majority of customers use their expensive astrographs with EAF permanently attached, and do the foam cuts in their boxes to accommodate that. That day is unfortunately not today. One can flip and do the ugly cut, though.
November 9, 2025 at 10:10 AM
Some day most telescope manufacturers would realize that the majority of customers use their expensive astrographs with EAF permanently attached, and do the foam cuts in their boxes to accommodate that. That day is unfortunately not today. One can flip and do the ugly cut, though.
Remastered the recent full Moon shots from the best data I had that night: app.astrobin.com/i/xp3dn4
Full Moon (November 2025) - AstroBin
First planetary light for Askar FRA 500.The seeing was favorable, despite a few thin high-altitude clouds that pass through the disk every so often. The whole disk does not fit onto the small sensor b...
app.astrobin.com
November 9, 2025 at 8:45 AM
Remastered the recent full Moon shots from the best data I had that night: app.astrobin.com/i/xp3dn4
Got my new imaging rig through its first 2 hours of deep-sky work: app.astrobin.com/i/vvcd9r
Heart Nebula (IC 1805); Askar FRA500 First Light - AstroBin
First light for Askar FRA500 setup and deep-sky targets.(The framing is not great — I wish I rotated it about 15 degrees clockwise — but maybe that really means the sensor is too small for this kind o...
app.astrobin.com
November 7, 2025 at 1:14 PM
Got my new imaging rig through its first 2 hours of deep-sky work: app.astrobin.com/i/vvcd9r