onetwentythree

6 ms·

1.
by onetwentythree 1mo ago
Yes, but remember they are very different telescopes for different types of astronomy. Roman is a survey telescope with a wide field of view, designed to discover new objects, etc. JWST has a large aperture and narrow FOV to get the closest
2.
by onetwentythree 5mo ago
To provide more information than the others who responded: typical sprinkler systems are not automatically activated in response to a fire alarm. Each sprinkler head has a small glass vial filled with a liquid, calibrated to break at a cert
3.
by onetwentythree 2y ago
You can get multi-turn absolute encoders for these applications.
4.
by onetwentythree 2y ago
I don’t think they’re in trouble for missing the deorbit target. The concern is that the second stage didn’t perform as expected. What if that affects the primary mission on the next flight? They need to understand the root cause before the
5.
by onetwentythree 3y ago
That only applies to linear regulators. The router on this page uses a switching regulator. Switching regulators have a relatively constant power draw over the entire input voltage range.
6.
by onetwentythree 3y ago
Not sure about a mission as old as voyager, but most modern missions use CCSDS protocols, which are open and available online. But just because you know the protocol dues not mean you have enough information to send a valid command. The com
7.
by onetwentythree 3y ago
The shock typically comes from the release of the preload, not from the NEA itself.
8.
by onetwentythree 3y ago
Maybe I’m wrong, but having it classified as a planetary mission probably funds their positions and a lot of continued research (even if the research is based on data already taken). Reclassifying the mission probably means the scientists n
9.
by onetwentythree 4y ago
It uses NASA’s Deep Space Network. There are three stations around the globe (California, Australia, and Spain), spaced so that there is near continuous coverage for deep space missions. JWST points it’s antenna at the station that is curre
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by onetwentythree 4y ago
I know this is a joke but... JWST does not use a typical flash-based SSD. The mass storage is all SDRAM. There are layers of error correction and scrubbing to handle bit flips.
11.
by onetwentythree 4y ago
There are only 8 hours of downlink time per day. DSN resources are limited and shared among many missions. Everything was sized based on the expected volume of data that the telescope would be able to take. The instruments only generateda
12.
by onetwentythree 4y ago
The antenna is steered to point towards the DSN antenna on the earth. A larger moving mass would make it harder to maintain telescope pointing while the antenna is moving. In reality, the antenna pointing is 'paused' during each s
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by onetwentythree 4y ago
There’s no way to mitigate the risk of statistically random meteorites that can come from any direction. The primary mitigation is to use predictions of larger events, such as meteor showers, and move the observatory to an orientation that
14.
by onetwentythree 5y ago
There is no consumable liquid helium. Past space telescopes have used consumable coolant, but JWST has a closed refrigeration system to cool the one instrument that requires active cooling. If all goes as planned, the limiting factor is pr
15.
by onetwentythree 5y ago
Yes, that is being planned for, but I’m not sure if any cycle one proposals involve joint observations. https://jwst-docs.stsci.edu/jwst-opportunities-and-policies/...
16.
by onetwentythree 5y ago
The spacecraft will make corrections with its onboard thrusters over the course of the mission.
17.
by onetwentythree 5y ago
Yes. Power supplies up to 60VDC are typically designed to fall under SELV and are considered intrinsically safe. SELV requires isolation and a single fault tolerant design. Here is some additional info: https://www.edn.com/w
18.
by onetwentythree 5y ago
Yes, you’re correct, but NASA is funding ~97% of the project. CSA and ESA each contributed a science instrument, and ESA is providing the launch. Otherwise, it’s all NASA.