A5024621685- Astro and Planetary Science
- Planetary Science and Exploration
- Spacecraft and Cryogenic Technologies
- Spacecraft Dynamics and Control
- Space Satellite Systems and Control
- Spacecraft Design and Technology
- Isotope Analysis in Ecology
- Atmospheric Ozone and Climate
- Calibration and Measurement Techniques
- Space Exploration and Technology
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Distributed systems and fault tolerance
- Adaptive optics and wavefront sensing
- Ophthalmology and Visual Impairment Studies
- High-pressure geophysics and materials
- Astrophysics and Star Formation Studies
- Photocathodes and Microchannel Plates
- Scientific Research and Discoveries
- Astronomy and Astrophysical Research
- Digital Imaging in Medicine
- Space Science and Extraterrestrial Life
- Meteorological Phenomena and Simulations
- Optical Systems and Laser Technology
- Astronomical Observations and Instrumentation
Anglia Ruskin University
2016-2025
Research Corporation Technologies (United States)
2022-2024
University of Arizona
2011-2024
Planetary Science Institute
2018-2020
Active asteroids are those that show evidence of ongoing mass loss. We report repeated instances particle ejection from the surface (101955) Bennu, demonstrating it is an active asteroid. The events were imaged by OSIRIS-REx (Origins, Spectral Interpretation, Resource Identification, and Security-Regolith Explorer) spacecraft. For three largest observed events, we estimated ejected velocities sizes, event times, source regions, energies. also determined trajectories photometric properties...
Purpose: To measure visual acuity at three different defocus planes in pseudophakic subjects with varying levels of spherical aberration induced by an adaptive optics simulator. The study aimed to simulate Extended Depth Focus (EDOF) intraocular lenses (IOLs). Setting: Private hospital (IMO, Barcelona, Spain) Design: Observational case series; modelling theory. Methods: Through-focus was measured 26 (age 63 ± 10 years old) simulator optimized for clinical use (VAO, Voptica SL, Murcia,...
We describe the space observatory architecture and mission design of Single Aperture Large Telescope for Universe Studies (SALTUS) mission, a National Aeronautics Space Administration (NASA) Astrophysics Probe Explorer concept. SALTUS will address key far-infrared science using 14-m diameter <45 K primary reflector (M1) provide unprecedented levels spectral sensitivity planet, solar system, galactic evolution studies cosmic origins. Drawing from Northrop Grumman's extensive NASA heritage,...
Abstract Near‐Earth asteroid (101955) Bennu is an active experiencing mass loss in the form of ejection events emitting up to hundreds millimeter‐ centimeter‐scale particles. The close proximity Origins, Spectral Interpretations, Resource Identification, and Security–Regolith Explorer spacecraft enabled monitoring particles for a 10‐month period encompassing Bennu's perihelion aphelion. We found 18 multiparticle events, with masses ranging from near zero grams (or thousands uncertainties)...
Objectives To safeguard Scotland’s community-acquired retinal images (colour fundus photographs) in a secure, centrally held repository and support variety of research including ocular, neurodegenerative systemic disease prediction. Design Retinal captured optometry practices linked to national, routinely collected, longitudinal healthcare data. Setting Community the Public Health Scotland National Safe Haven. Participants Adults (mostly aged 60+) who have attended their optometrist since...
Abstract The OSIRIS‐REx Asteroid Sample Return Mission is the third mission in National Aeronautics and Space Administration (NASA)'s New Frontiers Program first U.S. to return samples from an asteroid Earth. most important decision ahead of team selection a prime sample‐site on surface (101955) Bennu. success hinges identifying site that safe has regolith can readily be ingested by spacecraft's sampling mechanism. To inform this mission‐critical decision, Bennu mapped using Camera Suite...
Abstract The stereophotoclinometry (SPC) software suite has been used to generate global digital terrain models (DTMs) of many asteroids and moons, was the primary tool by Origins, Spectral Interpretation, Resource Identification, Security-Regolith Explorer (OSIRIS-REx) mission model shape asteroid Bennu. We describe dedicated preflight testing SPC for OSIRIS-REx using a synthetic “truth” model. metrics that determine internal consistency DTM, but it not known how these are related absolute...
In this paper, we discuss non-linear methodologies that can be employed to devise realtime algorithms suitable for guidance and control of spacecrafts during asteroid closeproximity operations.Combination optimal sliding theory provide the theoretical framework development laws generates thrust commands as function estimated spacecraft state.Using a Lyapunov second theorem one design are proven globally stable against unknown perturbations with known upper bound.Such autonomous targeting...
The process of becoming visually impaired or blind is undoubtedly a highly emotional experience, requiring practical and psychological support. Information on mental health support provision in the UK across sight-loss pathway, however, largely unknown, especially amongst healthcare practitioners that are often sought after for advice: referring optometrist eye clinic liaison officer (ECLO). This study aims to ascertain perceived accessibility quality pathway.Semi-structured individual...
Abstract We present observations of five stellar occultations for (11351) Leucus and reports from two efforts on (21900) Orus. Both objects are prime mission candidate targets the Lucy Discovery mission. Combined results indicate a very dark surface with p V = 0.037 ± 0.001, which is derived average multichord occultations. Our estimate triaxial ellipsoidal shape axial diameters 63.8 × 36.6 29.6 km assuming that spin pole normal to line sight. The actual object only roughly elliptical in...
Abstract The OSIRIS-REx mission used stereophotoclinometry (SPC) to generate digital terrain models (DTMs) of its target asteroid, Bennu. Here we present a suite preflight tests conducted identify the observing geometry and number images needed create DTMs that would enable successful navigation around surface asteroid. We demonstrate high-quality can be generated by using only five images: four are focused on topography, in which spacecraft’s viewing brackets (north, south, east, west),...
Abstract Stereophotoclinometry (SPC) was the prime method of shape modeling for NASA’s OSIRIS-REx mission to asteroid Bennu. Here we describe extensive testing conducted before launch certify SPC as NASA Class B flight software, which not only validated operational use but also quantified accuracy this technique. We used a computer-generated digital terrain model (DTM) synthetic truth input render simulated images per planned observing campaign. The were then create DTMs. Imaging sets,...
Aspera is an extreme-UV (EUV) Astrophysics small satellite telescope designed to map the warm-hot phase coronal gas around nearby galaxy halos. Theory suggests that this a significant fraction of galaxy's halo mass and plays critical role in its evolution, but exact poorly understood. observes via Ovi emission at 1032 °A using four parallel Rowland-Circle-like spectrograph channels single payload. Aspera's robust-and-simple design inspired by FUSE spectrograph, with smaller, 6.2 cm × 3.7 cm,...
Optical navigation (OpNav) is a critical subsystem of the OSIRIS-REx asteroid sample return mission, which operated in vicinity near-Earth (101955) Bennu from August 2018 through April 2021. A substantial amount mission resources across multiple subsystems and institutions required to ensure that OpNav data are successfully acquired. The KinetX team, part Flight Dynamics System (FDS), responsible for performing analysis develop operations plans; requesting, reviewing verifying ultimately...
International collaboration will be necessary for a viable program of exploration beyond the Moon, similar to that ISS, and reusable spacecraft also needed. Highenergy Earth orbits can drastically modified with lunar swingbys small propulsive maneuvers are used, especially near collinear Sun-Earth Earth-Moon libration points. The first human missions low-Earth orbit may go vicinity translunar point. This paper concentrate on next possible step, one into interplanetary space, could one-year...
We describe the space observatory architecture and mission design of SALTUS mission, a NASA Astrophysics Probe Explorer concept. will address key far-infrared science using 14-m diameter <45 K primary reflector (M1) provide unprecedented levels spectral sensitivity for planet, solar system, galactic evolution studies, cosmic origins. Drawing from Northrop Grumman's extensive heritage, flight system is based on LEOStar-3 spacecraft platform to carry Payload. The Payload comprised inflation...
Aspera is a NASA-funded UV SmallSat Mission in development with projected launch 2025. The goal of the mission to detect and map warm-hot gas circumgalactic medium nearby galaxies traced by Ovi emission line at 103.2 nm. To that goal, will conduct long-exposure observations one or more spatial fields around each target galaxy, employing two long-slit spectrographs. Spectra from both channels are focused on single micro-channel plate detector. In preparation mission's launch, we developing...
Aspera is a NASA Astrophysics Pioneers SmallSat mission designed to study diffuse Ovi emission from the warm-hot phase gas in halos of nearby galaxies. Its payload consists two identical Rowland Circle-type long-slit spectrographs, sharing single MicroChannel plate detector. Each spectrograph channel an off-axis parabola primary mirror and toroidal diffraction grating optimized for 1013-1057 Å bandpass. Despite simple configuration, optical alignment/integration process challenging due tight...
Aspera is a NASA-funded UV SmallSat mission designed to detect and map warm-hot phase halo gas around nearby galaxies. The payload faint diffuse O VI emission at 103.2 nm, satisfying the sensitivity requirement of 5×10<sup>−19</sup> erg/s/cm<sup>2</sup>/arcsec<sup>2</sup> over 179 hours exposure. In this manuscript, we describe overall design Aspera. comprises two identical co-aligned long-slit spectrograph optical channels sharing common UV-sensitive microchannel plate detector. delivers...
Aspera is a NASA Astrophysics Pioneers SmallSat mission designed to study diffuse OVI emission from the warm-hot phase gas in halos of nearby galaxies. Its payload consists two identical Rowland Circle-type long-slit spectrographs, sharing single MicroChannel plate detector. Each spectrograph channel an off-axis parabola primary mirror and toroidal diffraction grating optimized for 1013-1057 Angstroms bandpass. Despite simple configuration, optical alignment/integration process challenging...