G. Naletto
A5076828737- Astro and Planetary Science
- Planetary Science and Exploration
- Solar and Space Plasma Dynamics
- Stellar, planetary, and galactic studies
- Adaptive optics and wavefront sensing
- Isotope Analysis in Ecology
- Calibration and Measurement Techniques
- Atmospheric Ozone and Climate
- Ionosphere and magnetosphere dynamics
- Astronomical and nuclear sciences
- CCD and CMOS Imaging Sensors
- Pulsars and Gravitational Waves Research
- Photocathodes and Microchannel Plates
- Spacecraft Design and Technology
- Geology and Paleoclimatology Research
- Spacecraft and Cryogenic Technologies
- Advanced Optical Sensing Technologies
- Astronomical Observations and Instrumentation
- Infrared Target Detection Methodologies
- Geophysics and Sensor Technology
- Astronomy and Astrophysical Research
- Advanced Frequency and Time Standards
- Solar Radiation and Photovoltaics
- Robotics and Sensor-Based Localization
- Geological and Geochemical Analysis
University of Padua
2015-2024
Osservatorio Astronomico di Padova
2015-2024
Istituto di Fotonica e Nanotecnologie
2013-2024
National Institute for Astrophysics
2006-2022
Center for Biomolecular Nanotechnologies
2011-2022
University of Florence
2021-2022
Istituto Nazionale di Fisica Nucleare, Galileo Galilei Institute for Theoretical Physics
2018-2022
Osservatorio Astrofisico di Torino
2021
Space (Italy)
1998-2020
Nitto RIKEN (Japan)
2020
Images from the OSIRIS scientific imaging system onboard Rosetta show that nucleus of 67P/Churyumov-Gerasimenko consists two lobes connected by a short neck. The has bulk density less than half water. Activity at distance Sun >3 astronomical units is predominantly neck, where jets have been seen consistently. rotates about principal axis momentum. surface morphology suggests removal larger volumes material, possibly via explosive release subsurface pressure or creation overhangs sublimation,...
We present a self-consistent empirical model for several plasma parameters of polar coronal hole near solar minimum, derived from observations with the Solar and Heliospheric Observatory Ultraviolet Coronagraph Spectrometer. The describes radial distribution density electrons, H0, O5 + outflow velocity unresolved most probable velocities H0 during period between 1996 November 1997 April. In this Letter, we compare H I Lyα O VI λλ1032, 1037 emission lines spatial models parameters, iterate...
Critical measurements for understanding accretion and the dust/gas ratio in solar nebula, where planets were forming 4.5 billion years ago, are being obtained by GIADA (Grain Impact Analyser Dust Accumulator) experiment on European Space Agency's Rosetta spacecraft orbiting comet 67P/Churyumov-Gerasimenko. Between 3.6 3.4 astronomical units inbound, OSIRIS (Optical, Spectroscopic, Infrared Remote Imaging System) detected 35 outflowing grains of mass 10(-10) to 10(-7) kilograms, 48 10(-5)...
Images of comet 67P/Churyumov-Gerasimenko acquired by the OSIRIS (Optical, Spectroscopic and Infrared Remote Imaging System) imaging system onboard European Space Agency’s Rosetta spacecraft at scales better than 0.8 meter per pixel show a wide variety different structures textures. The data importance airfall, surface dust transport, mass wasting, insolation weathering for cometary evolution, they offer some support subsurface fluidization models loss through ejection large chunks material.
We analyzed more than 200 OSIRIS NAC images with a pixel scale of 0.9−2.4 m/pixel comet 67P/Churyumov-Gerasimenko (67P) that have been acquired from onboard the Rosetta spacecraft in August and September 2014 using stereo-photogrammetric methods (SPG). derived improved position pointing data for high-resolution shape model consists about 16 million facets (2 m horizontal sampling) typical vertical accuracy at decimeter scale. From this model, we derive volume northern hemisphere 9.35 km3 ±...
Context. The complex shape of comet 67P and its oblique rotation axis cause pronounced seasonal effects. Irradiation hence activity vary strongly.
Context. We investigate the formation and evolution of comet nuclei other trans-Neptunian objects (TNOs) in solar nebula primordial disk prior to giant planet orbit instability foreseen by Nice model.
ABSTRACT The Rosetta probe, orbiting Jupiter-family comet 67P/Churyumov–Gerasimenko, has been detecting individual dust particles of mass larger than 10 −10 kg by means the GIADA collector and OSIRIS Wide Angle Camera Narrow since 2014 August will continue until 2016 September. Detections single allow us to estimate anisotropic flux from 67P, infer loss rate size distribution at surface sunlit nucleus, see whether 67P evolves in time. velocity orbiter, relative is much lower measured GIADA,...
Metis is the first solar coronagraph designed for a space mission capable of performing simultaneous imaging off-limb corona in both visible and UV light. The observations obtained with aboard Solar Orbiter ESA-NASA observatory will enable us to diagnose, unprecedented temporal coverage spatial resolution, structures dynamics full from 1.7 $R_\odot$ about 9 $R_\odot$. Due uniqueness profile, be able observe close vantage point (down 0.28 AU), achieving out-of-ecliptic views increase orbit...
The Near-Infrared Spectrometer and Photometer (NISP) on board the Euclid satellite provides multiband photometry R>=450 slitless grism spectroscopy in 950-2020nm wavelength range. In this reference article we illuminate background of NISP's functional calibration requirements, describe instrument's integral components, provide all its key properties. We also sketch processes needed to understand how NISP operates is calibrated, technical potentials limitations. Links articles providing more...
We present a comprehensive and self-consistent empirical model for several plasma parameters in the extended solar corona above polar coronal hole. The is derived from observations with SOHO Ultraviolet Coronagraph Spectrometer (UVCS/SOHO) during period between 1996 November 1997 April. compare of H I Lyα O VI λλ1032, 1037 emission lines detailed three-dimensional models iterate optimal consistency measured synthesized observable quantities. Empirical constraints are obtained radial...
In this paper we present a novel analysis of the feasibility quantum key distribution between LEO satellite and ground station. First all, study signal propagation through turbulent atmosphere for uplinks downlinks, discussing contribution beam spreading wandering. Then introduce model background noise channel during night-time day-time, calculating signal-to-noise ratio different configurations. We also discuss expected error-rate due to imperfect polarization-compensation in channel....
Aims. The OSIRIS camera onboard the Rosetta spacecraft has been acquiring images of comet 67P/Churyumov-Gerasimenko (67P)'s nucleus at spatial resolutions down to ~0.17 m/px ever since Aug. 2014. These have yielded unprecedented insight into morphological diversity comet's surface. This paper presents an overview regional morphology 67P.
Context. We present an investigation of the surface properties areas on nucleus comet 67P/Churyumov-Gerasimenko.
Context. The Rosetta mission of the European Space Agency has been orbiting comet 67P/Churyumov-Gerasimenko (67P) since August 2014 and is now in its escort phase. A large complement scientific experiments designed to complete most detailed study a ever attempted are onboard Rosetta.
We study the link between gravitational slopes and surface morphology on nucleus of comet 67P/Churyumov-Gerasimenko provide constraints mechanical properties cometary material. computed for five regions that are representative different morphologies observed surface, using two shape models from OSIRIS images by stereo-photoclinometry (SPC) stereo-photogrammetry (SPG) techniques. estimated tensile, shear, compressive strengths considerations. The show a similar general pattern in terms...