Quote from: Hobbes-22 on 07/21/2022 03:30 pmWe've been operating spacecraft at L2 (including one with an exposed large mirror) for several decades now. That tells us impacts of this size are rare, or we'd have noticed them before.We haven't been operating 6.5m wide sensitive particle impact detectors in L2, though. Or particle impact detectors of any size, beyond measurements of aggregate drop in solar array power assumed to be from micrometeoroid impact (current L2 telescopes other than JWST are enclosed). There are models of expected micrometeoroid population, but limited direct measurements.
We've been operating spacecraft at L2 (including one with an exposed large mirror) for several decades now. That tells us impacts of this size are rare, or we'd have noticed them before.
The data set comprises millions of peaks and valleys that correspond to tiny deviations in the spacecraft’s angular velocity. These extrema reflect either 1) normal operation of the system at the lowest deviation level (the noise floor), 2) spacecraft manoeuvers, 3) unexplained events, or 4) micrometeoroid impacts. As the first part of the project, I classified these events and set out to find ways to distinguish small-amplitude impacts embedded in the noise floor of normal operation. This being akin to a needle in a haystack problem, it was necessary to study the time profiles caused by the micrometeoroid impacts very carefully, describe them with statistical parameters, and apply these parameters to find small-amplitude impacts embedded in the noise floor. Finding impact signatures in the data provides a distribution of the angular velocity change values; however, these values do not directly correspond to the size of the particles. The AOCS reaction depends on impact location, mass, and velocity.
What We're Seeing Through NASA's James Webb Space Telescope21 Jul2022A ~3,000,000x zoom from Earth into Webb's First Deep Field and beyond. Best viewed full screen, and with sound. More on the math and making of: claybavor.com/blog/webbs-deep-fieldImage credits:Night Sky – Clay BavorMoon and M52 Cluster – Adobe Stock / InfinitalavitaWebb’s First Deep Field – NASA, ESA, CSA, and STScI Spiral Galaxy NGC 691 – SA/Hubble & NASA, A. Riess et al.Milky Way Galaxy – Jesse Levinson
The James Webb Space Telescope has already traveled 1 million miles through space. Soon, the next-generation telescope will be making its way through the U.S. Postal Service.The Postal Service announced Tuesday that the James Webb Space Telescope will be featured on new stamps becoming available September 8 (pre-orders begin Aug. . The image features the telescope's 18 gold-coated segments, which form a 21-foot mirror lens.The new Forever stamps – priced at 60 cents, a pane of 20 is $12 – will feature the $10 billion scientific marvel, which sent back images earlier this month that wowed the scientific community and laypersons alike. The telescope, which was launched Dec. 25, 2021, is a joint project involving NASA, The Canadian Space Agency and the European Space Agency.
Quote from: ttle2 on 07/27/2022 07:00 amA new preprint describes an even higher redshift, z=16.7, galaxy candidate: https://arxiv.org/abs/2207.12356Now claims of z~20 at First Batch of Candidate Galaxies at Redshifts 11 to 20 Revealed by the James Webb Space Telescope Early Release Observations. https://arxiv.org/pdf/2207.11558.pdf
A new preprint describes an even higher redshift, z=16.7, galaxy candidate: https://arxiv.org/abs/2207.12356
Three days later, just minutes before the daily deadline on arxiv.org, the server where scientists can upload early versions of papers, the team submitted their research. They missed out on being first by 13 seconds, “which was pretty funny,” said Pascale.
Oh! - Am I understanding this right, that each of those concentric not-quite-circular shapes are a tail of dust thrown out by an orbit of the two stars? And that the rings are then expanding outwards?
When is JWST scheduled to observe the Proxima system?
There is some Jupiter data now in the archive, but I am finding it difficult to work with. One problem is that the planet rotates, so features move between different images. This image, taken at 1.5 microns, gives an idea of the resolution available.
Quote from: Don2 on 07/30/2022 08:54 amThere is some Jupiter data now in the archive, but I am finding it difficult to work with. One problem is that the planet rotates, so features move between different images. This image, taken at 1.5 microns, gives an idea of the resolution available.Don, if you know: are those black dots(?) image artifacts? Moons? (Seems like too many/too uniform in size, but…)