Skip to main content

New top story on Hacker News: Ask HN: Which re-entry/de-orbit was this?

Ask HN: Which re-entry/de-orbit was this?
18 by krmblg | 3 comments on Hacker News.
Hi HN! With the CZ5N re-entry happening I figured you could point me in the right direction to solve this mystery: On the evening of july 14, around 20:15 UTC we saw something pass over our heads fairly slowly (apparently stationary), leaving a greenish, sparkly line over the course of several minutes. It also left a long trail that apparently was still illuminated by the sun, originating at an azimuth of ~210° (SSW). Our observation position was ~48.08° N, 11.28° E (southern Germany, near Munich). About 20 minutes later I tried digging into it a little on James Darpinian's See A Satellite Tonight and found a rocket/booster stage that could have had a matching trajectory (CZ-4B R/B). I'd love to dig deeper into this, so: 1. Are there any websites where I can revisit that time/location? I'm aware of TLEs but would appreciate a "time-travel" view for the location in question 2. The CZ-4B R/B still seems to be „around“. Is it likely that we saw re-entry of only smaller parts of it that were just low enough to "hit" a substantial amount of atmosphere? 3. Are there other explanations for a slow-moving object leaving a trail creating greenish, sparkly lines? 4. What additional information would be needed to figure out what happened? Any help is much appreciated!

Comments

Popular posts from this blog

New top story on Hacker News: Ask HN: Is the EULA on my new $30k RED cinema camera legal?

Ask HN: Is the EULA on my new $30k RED cinema camera legal? 70 by red_throwaway | 77 comments on Hacker News. TLDR: I bought a $30K professional cinema camera that doesn't work unless I sign away my rights to privacy and possibly the video content I make with it ( at least it seems ) Over the past few years my photography business has seen a surge in demand for ultra high quality video production work. In an effort to meet this demand, I picked up one of RED Digital Cinema's newest pro camera bodies, the RED V-RAPTOR. Considering this camera is used by professional filmmakers to create films destined for cinemas, it's not surprising that it came with a $30k price tag. After unboxing and assembling it, I power the camera on and the first thing I see is a wall of legal text on the embedded LCD. Turns out it's a "Software License Agreement" that I'm required to consent to using the on-camera menu buttons before any of the camera's functionality becomes...

New top story on Hacker News: Launch HN: Spoken (YC S21) – Better furniture shopping

Launch HN: Spoken (YC S21) – Better furniture shopping 14 by lgabraham | 3 comments on Hacker News. Hi HN, we’re Dane and Geoff, the founders of Spoken ( https://www.spoken.io/ ). We make it easy to find the lowest price for any furniture item across all big stores. Buying physical things on the internet is hard. You have to quality-check a product without touching it, double-check dimensions for where the thing will go, and evaluate a seller's credibility, often with little data. But buying furniture online is a special case of hard, because the market is deliberately deceptive. Furniture sellers actively prevent consumers from easily finding the same item at other stores, or under other names, because this allows them to charge more. The sellers get to name the products and they name them in confusing ways to facilitate price discriminaton. For example, this table at Wayfair ( https://ift.tt/RF071cQ... ) can also be found at Appliances Connection under a different name for rou...