A5074559919- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Planetary Science and Exploration
- Astronomy and Astrophysical Research
- Adaptive optics and wavefront sensing
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Astrophysics and Star Formation Studies
- History and Developments in Astronomy
- Geophysics and Gravity Measurements
- Optical Systems and Laser Technology
- Advanced Frequency and Time Standards
- SAS software applications and methods
- Space Satellite Systems and Control
- Historical Astronomy and Related Studies
- Geophysics and Sensor Technology
- Inertial Sensor and Navigation
- GNSS positioning and interference
- Atomic and Subatomic Physics Research
- Geomagnetism and Paleomagnetism Studies
- Space exploration and regulation
- Astrophysics and Cosmic Phenomena
- Astronomical and nuclear sciences
- Isotope Analysis in Ecology
- Space Science and Extraterrestrial Life
University of Arizona
2014-2024
Las Cumbres Observatory Global Telescope Network
2014-2024
Osservatorio Astronomico di Padova
2022
Large Synoptic Survey Telescope Corporation
2014-2016
Max Planck Society
2015
Max Planck Institute for Radio Astronomy
2015
Canada–France–Hawaii Telescope
2003-2013
University of Hawaii System
2004-2007
University of Hawaiʻi at Mānoa
2004
Observatoire de la Côte d’Azur
1990-2003
On 21 July 1969, during the first manned lunar mission, Apollo 11, retroreflector array was placed on moon, enabling highly accurate measurements of Earthmoon separation by means laser ranging. Lunar ranging (LLR) turns system into a laboratory for broad range investigations, including astronomy, science, gravitational physics, geodesy, and geodynamics. Contributions from LLR include three-orders-of-magnitude improvement in accuracy ephemeris, several-orders-of-magnitude measurement...
Abstract Gamma-ray bursts (GRBs) are classified into long and short events. Long GRBs (LGRBs) associated with the end states of very massive stars, while (SGRBs) linked to merger compact objects. GRB 200826A was a peculiar event, because by definition it an SGRB, rest-frame duration ∼0.5 s. However, this event energetic soft, which is consistent LGRBs. The relatively low redshift ( z = 0.7486) motivated comprehensive, multiwavelength follow-up campaign characterize its host, search for...
Abstract Recent observations have shown that the atmospheres of ultrahot Jupiters (UHJs) commonly possess temperature inversions, where increases with increasing altitude. Nonetheless, which opacity sources are responsible for presence these inversions remains largely observationally unconstrained. We used LBT/PEPSI to observe atmosphere UHJ KELT-20 b in both transmission and emission order search molecular agents could be inversion. validate our methodology by confirming a previous...
We have started since 1997 the Meudon Multicolor Survey of Outer Solar System Objects with aim collecting a large and homogeneous set color data for Trans-Neptunian Centaurs objects [...] combined sample 52 B-R measurements 8 Centaurs, 22 Classicals, 13 Plutinos, Scattered 1 object unidentified dynamical class. This dataset is largest single published to date [...]. A strong (color) correlation mean excitation velocity points toward space weathering/impact origin diversity. However, thorough...
We report the orbital distribution of trans-Neptunian comets discovered during first discovery year Canada–France Ecliptic Plane Survey (CFEPS). CFEPS is a Kuiper Belt object survey based on observations acquired by Very Wide component Canada–France–Hawaii Telescope Legacy (LS-VW). The year's detections consist 73 objects, 55 which have now been tracked for three years or more, providing precise orbits. Although this sample size small compared to world-wide inventory, because we an...
ABSTRACT The study of exoplanets and especially their atmospheres can reveal key insights on evolution by identifying specific atmospheric species. For such investigations, high-resolution transmission spectroscopy has shown great success, for Jupiter-type planets. Towards the characterization smaller planets, super-Earth exoplanet 55 Cnc e is one most promising terrestrial studied to date. Here, we present a spectroscopic transit observation this planet, acquired with PEPSI instrument at...
Decline and recovery timescales surrounding eclipse are indicative of the controlling physical processes in Io's atmosphere. Recent studies have established that majority molecular atmosphere, SO2 SO, condenses during its passage through Jupiter's shadow. The response atomic atmosphere is less certain, having been characterized solely by ultraviolet aurorae. Here we explore optical aurorae for first time. We find oxygen to be indifferent changing illumination, with [O I] brightness merely...
Abstract— The newly discovered asteroid 2002 AA 29 moves in a very Earth‐like orbit that relative to Earth has unique horseshoe shape and allows transitions quasi‐satellite state. This is the first body known be simple heliocentric orbit, moving along its parent planet's orbit. It similarly also true co‐orbital object of Earth, since other asteroids 1:1 resonance with have orbits dissimilar from our planet. When quasi‐satellite, it remains within 0.2 AU for several decades. exhibit this...
We present comprehensive cluster membership and g'r' photometry of the prototypical old, metal-rich Galactic star NGC 6791. The proper-motion catalog contains 58,901 objects down to g'=24, limited a circular area radius 30 arcmin. highest precision proper motions is 0.08 mas/yr. Our confirm all main also some rare constituents total number probable members g'=22 (M_V=+8) 4800, corresponding M_tot=5000 M_solar. New findings include an extended horizontal branch in this cluster. angular 6791...
Context. Pluto's tenuous nitrogen (N2) atmosphere undergoes strong seasonal effects due to high obliquity and orbital eccentricity, has been recently (July 2015) observed by the New Horizons spacecraft. Goals are (i) construct a well calibrated record of evolution surface pressure on Pluto (ii) constrain structure lower using central flash in 2015. Method: eleven stellar occultations between 2002 2016 used retrieve atmospheric profiles (density, pressure, temperature) $\sim$5 km $\sim$380...
The composition of comets in the Solar System come multiple groups thought to encode information about their formation different regions outer protosolar disk. recent discovery second interstellar object, 2I/Borisov, allows for spectroscopic investigations into its gas content and a preliminary classification it within comet taxonomies test applicability planetesimal models other stellar systems. We present imaging observations from 2019 September 20th October 26th at Bok, MMT, LBT...
The Lunar Laser Ranging station at the Observatoire de la Côte d'Azur, France, permits to measure Earth-Moon distance with millimetric precision. Applications in astronomy, lunar science, geodesy, and gravitation are summarised. Expected scientific results data presented. A complete error budget is given, showing that precision mainly limited by orientation size of corner cube arrays placed on Moon. measurement accuracy degraded bad knowledge air index. time stability, computed from echoes,...
We present proper motions and astrometric membership analysis for 15,750 stars around the intermediate-age open cluster NGC 6819. The accuracy of relative well-measured ranges from ∼0.2 mas yr−1 within 10' center to 1.1 outside this radius. In motion vector-point diagram, separation between members field is convincing down V ∼ 18 center. formal sum probabilities indicates a total ∼2500 22. confirm several variable stars, including some eclipsing binaries. estimated absolute 6819 yr−1. A...
The Large Binocular Telescope Interferometer is a NASA-funded nulling and imaging instrument designed to coherently combine the two 8.4-m primary mirrors of LBT for high-sensitivity, high-contrast, highresolution infrared (1.5-13 <i>μ</i>m). PHASECam LBTI's near-infrared camera used measure tip-tilt phase variations between AO-corrected apertures provide high-angular resolution observations. We report on status system describe its on-sky performance measured during first semester 2014....
The Large Binocular Telescope Interferometer mid-infrared camera, LMIRcam, imaged Io on the night of 2013 December 24 UT and detected strong M-band (4.8 μm) thermal emission arising from Loki Patera. 22.8 m baseline provides an angular resolution ∼32 mas (∼100 km at Io) resolving Patera into two distinct maxima originating different regions within Loki's horseshoe lava lake. This observation is consistent with presence a high-temperature source observed in previous studies combined...