Computer scientist and entrepreneur. Working on archeometallurgy. Physics and spaceflight is my passion though. Mostly posting #Astrophotography stuff here.https://bsky.app/profile/jaltheimer.bsky.socialhttps://bsky.app/profile/jaltheimer.bsky.social/post/3mh4ltujgys2zOver the next few days there might be a few clear nights for #Astrophotography here. Anybody want to take a guess what my current wide field project is? Its a bit of a challenge i set myself with my old Canon EOS 700d on a star tracker, but after ~ one hour its at least somewhat visible.15 Mar 2026 18:41 +0000at://did:plc:acvmeqybfsbcaubquwcda5j3/app.bsky.feed.post/3mh4ltujgys2zhttps://bsky.app/profile/jaltheimer.bsky.social/post/3mcupwb2tmk2yA few more pictures of the #Aurora from last night. Imaged on the Gehrenberg in BW south Germany.20 Jan 2026 17:52 +0000at://did:plc:acvmeqybfsbcaubquwcda5j3/app.bsky.feed.post/3mcupwb2tmk2yhttps://bsky.app/profile/jaltheimer.bsky.social/post/3mcsvqj772c26Its not everyday that #Astrophotography has to take a backseat for northern lights this intense in southern Germany. First time for me to see them bright enough to cast shadows.20 Jan 2026 00:31 +0000at://did:plc:acvmeqybfsbcaubquwcda5j3/app.bsky.feed.post/3mcsvqj772c26https://bsky.app/profile/jaltheimer.bsky.social/post/3mcpy2t4khc22Image of M33 in the constellation Triangulum from ~August last year. It is always fascinating what an old DSLR can achieve with a bit of patience. Of course a modern dedicated camera like a Asi 2600 is more efficient for #Astrophotography but at 5 to 6 times the price? Maybe a 2 GOTO mount instead?18 Jan 2026 20:34 +0000at://did:plc:acvmeqybfsbcaubquwcda5j3/app.bsky.feed.post/3mcpy2t4khc22https://bsky.app/profile/jaltheimer.bsky.social/post/3mc6bmxzmbc2eFinally had a short gap in the clouds a few days ago to capture the Great Red Spot on Jupiter. Imaged with my SW 130/650mm Newton and ZWO ASI 676 MC camera + 2x barlow. #Astrophotography11 Jan 2026 19:38 +0000at://did:plc:acvmeqybfsbcaubquwcda5j3/app.bsky.feed.post/3mc6bmxzmbc2ehttps://bsky.app/profile/jaltheimer.bsky.social/post/3mbmthhdnck2vThe double cluster im Perseus (NGC 869 and 884), is a nice broadband target for #Astrophotography even when the Moon is out. I myself love the diffraction spikes caused by the secondary spider of Newton or RC telescopes for these types of targets. Imaged last year during a rare clear night in autumn04 Jan 2026 21:09 +0000at://did:plc:acvmeqybfsbcaubquwcda5j3/app.bsky.feed.post/3mbmthhdnck2vhttps://bsky.app/profile/jaltheimer.bsky.social/post/3mbfbdt6w5s2cAn other image from the same #Astrophotography night as the last image of Jupiter with Ganymede transit and the Io photobomb. Really have to try and get an other shot of Jupiter with its Red Spot visible, but somehow timing never seems to work out.01 Jan 2026 20:56 +0000at://did:plc:acvmeqybfsbcaubquwcda5j3/app.bsky.feed.post/3mbfbdt6w5s2chttps://bsky.app/profile/jaltheimer.bsky.social/post/3mbd36ut3wc2xHappy New Year everybody!01 Jan 2026 00:00 +0000at://did:plc:acvmeqybfsbcaubquwcda5j3/app.bsky.feed.post/3mbd36ut3wc2xhttps://bsky.app/profile/jaltheimer.bsky.social/post/3mbcc2bo6xk2vWeather overnight was clear for the first time in what feels like months. With seeing this good and a bright Moon out, Jupiter was the obvious target for #Astrophotography. Despite the limited aperture of my 130mm Newton Ganymedes transit was easy to capture with Io squeezing into the frame too.31 Dec 2025 16:31 +0000at://did:plc:acvmeqybfsbcaubquwcda5j3/app.bsky.feed.post/3mbcc2bo6xk2vhttps://bsky.app/profile/jaltheimer.bsky.social/post/3m6skurmfqc2rHaven't seen a lot of posts about the Luminous Red Nova AT2025abao in M31 on here, so I thought I give it a try and 2 days ago weather cleared up just long enough to get a bit of #Astrophotography data. I was really surprised that it was visible even in single subs.29 Nov 2025 23:36 +0000at://did:plc:acvmeqybfsbcaubquwcda5j3/app.bsky.feed.post/3m6skurmfqc2rhttps://bsky.app/profile/jaltheimer.bsky.social/post/3m5hgciy7qk2uThe Veil nebula in Cygnus imaged with my Samyang 135mm F2 lens. A great #Astrophotography target for Summer and early Autumn. Despite its distance of ~2500 lightyears, this supernova remnant just fit into the frame. Total exposure time about 2 hours.12 Nov 2025 19:49 +0000at://did:plc:acvmeqybfsbcaubquwcda5j3/app.bsky.feed.post/3m5hgciy7qk2uhttps://bsky.app/profile/jaltheimer.bsky.social/post/3m475qt6q3225Still no clear weather in sight, so here are a few more fly agaric from my local forest. #mushroom27 Oct 2025 19:30 +0000at://did:plc:acvmeqybfsbcaubquwcda5j3/app.bsky.feed.post/3m475qt6q3225https://bsky.app/profile/jaltheimer.bsky.social/post/3m3krcn5gss2rHad a quick glimpse between the clouds on comet C/2025 A6 (Lemmon) in Canes Venatici well after sunset. Composite of around 3 minutes worth of 1 second untracked images. #Astrophotography19 Oct 2025 16:54 +0000at://did:plc:acvmeqybfsbcaubquwcda5j3/app.bsky.feed.post/3m3krcn5gss2rhttps://bsky.app/profile/jaltheimer.bsky.social/post/3m2ru6wi5u22vAn other fly agaric growing in my local forest, while I'm waiting for a clear sky. #mushroom09 Oct 2025 19:09 +0000at://did:plc:acvmeqybfsbcaubquwcda5j3/app.bsky.feed.post/3m2ru6wi5u22vhttps://bsky.app/profile/jaltheimer.bsky.social/post/3m2kgbzptzs27More mushrooms from a local forest. The damp weather really helps them grow very fast.06 Oct 2025 20:11 +0000at://did:plc:acvmeqybfsbcaubquwcda5j3/app.bsky.feed.post/3m2kgbzptzs27https://bsky.app/profile/jaltheimer.bsky.social/post/3m2kblr6cvs27As expected from this season, its cloudy and no stars in sight. But on the other hand mushroom season is in full swing.06 Oct 2025 18:47 +0000at://did:plc:acvmeqybfsbcaubquwcda5j3/app.bsky.feed.post/3m2kblr6cvs27https://bsky.app/profile/jaltheimer.bsky.social/post/3lzhgge6aes2dThe Helix Nebula or Caldwell 63 is a planertary nebula in the constellation Aquarius. When it comes to planetary nebulas, it's apparent size is extremely large and its features and structures become visible even in mid sized telescopes. Making it a very interesting #Astrophotography target.22 Sep 2025 22:11 +0000at://did:plc:acvmeqybfsbcaubquwcda5j3/app.bsky.feed.post/3lzhgge6aes2dhttps://bsky.app/profile/jaltheimer.bsky.social/post/3lyj2o62uv22xNeptune and it's moon Triton(which might actually be a captured dwarf planet) in the early morning hours of 6th September. 10 second exposures at f27 where just enough to make Triton visible without resulting in trailing lights. #Astrophotography10 Sep 2025 20:20 +0000at://did:plc:acvmeqybfsbcaubquwcda5j3/app.bsky.feed.post/3lyj2o62uv22xhttps://bsky.app/profile/jaltheimer.bsky.social/post/3lybguvrxes2wBesides the planets there is of course the Moon as a bright target. I tried to utilize the full width and length of an APS-C sensor by using a 2x telecentric barlow. The cropped in images should provide full resolution of some regions. #Astrophotography07 Sep 2025 19:38 +0000at://did:plc:acvmeqybfsbcaubquwcda5j3/app.bsky.feed.post/3lybguvrxes2whttps://bsky.app/profile/jaltheimer.bsky.social/post/3ly76viyfsk2iWhile Deep Space has to take a back seat in #Astrophotography during the current Moon phase, I'm trying to squeeze out every last bit out of my Deep Space Rig for planetary imaging. Here is Saturn through my 130mm Newton and Canon EOS 250d.06 Sep 2025 22:09 +0000at://did:plc:acvmeqybfsbcaubquwcda5j3/app.bsky.feed.post/3ly76viyfsk2ihttps://bsky.app/profile/jaltheimer.bsky.social/post/3lwrhdr7zn222Not a typical #Astrophotography target, but I really really wanted to try and see if can at least capture a glimpse of the interstellar comet #3I/Atlas shortly after sundown and just before it vanished below the horizon. Challanging with a 130mm newton and a reg. DSLR but it might just have worked.19 Aug 2025 17:38 +0000at://did:plc:acvmeqybfsbcaubquwcda5j3/app.bsky.feed.post/3lwrhdr7zn222https://bsky.app/profile/jaltheimer.bsky.social/post/3lwp42dvc2k2gSupernova SN 2025rbs in the galaxy NGC7331 from yesterdays short #Astrophotography session. My personal first for a type 1a Supernova (The bright spot right next to the galactic nucleus).18 Aug 2025 19:11 +0000at://did:plc:acvmeqybfsbcaubquwcda5j3/app.bsky.feed.post/3lwp42dvc2k2ghttps://bsky.app/profile/jaltheimer.bsky.social/post/3lwk5ppk5nc2tThe second picture of this summers #Astrophotography targets. The Trifid Nebula M20. As with M8 I didn't have nearly as much time as I wanted due to bad weather and short nights, but it is still quite a sight, even at relatively low exposure time.16 Aug 2025 19:57 +0000at://did:plc:acvmeqybfsbcaubquwcda5j3/app.bsky.feed.post/3lwk5ppk5nc2thttps://bsky.app/profile/jaltheimer.bsky.social/post/3lwadcbaqc22mNot only where the nights extremely short like every summer, the weather also didn't want to play nice for #Astrophotography this year. Which means I wont get any more time on the targets I had selected this year. But I did get a few h on the Lagoon Nebula, despite it being insanely low in the sky.12 Aug 2025 22:10 +0000at://did:plc:acvmeqybfsbcaubquwcda5j3/app.bsky.feed.post/3lwadcbaqc22mhttps://bsky.app/profile/jaltheimer.bsky.social/post/3ltfqzbx7uc2aMy favourite galaxy cluster for #Astrophotography by far is the Coma Cluster in the constellation Coma Berenices. It might not be as majestic as the Virgo cluster, but the sheer number of small galaxies in the FOV of a medium sized telescope is breathtaking. Imaged with my trusty Canon EOS 250d.07 Jul 2025 21:44 +0000at://did:plc:acvmeqybfsbcaubquwcda5j3/app.bsky.feed.post/3ltfqzbx7uc2a