5 research outputs found
End-to-end numerical modeling of the Roman Space Telescope coronagraph
The Roman Space Telescope will have the first advanced coronagraph in space,
with deformable mirrors for wavefront control, low-order wavefront sensing and
maintenance, and a photon-counting detector. It is expected to be able to
detect and characterize mature, giant exoplanets in reflected visible light.
Over the past decade the performance of the coronagraph in its flight
environment has been simulated with increasingly detailed diffraction and
structural/thermal finite element modeling. With the instrument now being
integrated in preparation for launch within the next few years, the present
state of the end-to-end modeling is described, including the measured flight
components such as deformable mirrors. The coronagraphic modes are thoroughly
described, including characteristics most readily derived from modeling. The
methods for diffraction propagation, wavefront control, and structural and
thermal finite-element modeling are detailed. The techniques and procedures
developed for the instrument will serve as a foundation for future
coronagraphic missions such as the Habitable Worlds Observatory.Comment: 113 pages, 85 figures, to be published in SPIE Journal of
Astronomical Telescopes, Instruments, and System
Synthetic Tracking Using ZTF Deep Drilling Data Sets
International audienceThe Zwicky Transit Facility (ZTF) is a powerful time domain survey telescope with a large field of view of 47 . We apply the synthetic tracking technique to integrate a ZTF’s deep drilling data set, which consists of 133 nominal 30 s exposure frames spanning about 1.5 hr, to search for slowly moving asteroids down to approximately 23rd magnitude. We found 1168 objects from searching 40 of the 64 CCD-quadrant subfields, each of which covers a field size of about 0.73 . While most of the objects are in the core region of the asteroid belt, there are asteroids belonging to families of Trojan, Hilda, Hungaria, Phocaea, and near-Earth-asteroids. Such an approach is effective and productive for discovering new asteroids. Here we report the data processing and results as well as discuss a potential deep drilling operation mode using this approach for survey facilities