Results 31 to 40 of about 1,669 (216)

Performance Constraints of All-Perovskite Tandem Solar Cells in Low-Intensity, Low-Temperature Environments. [PDF]

Adv Mater
All‐perovskite tandem solar cells are evaluated under low‐intensity and low‐temperature (LILT) conditions relevant to space environments. Distinct loss regimes emerge, where weaker entropic mixing causes halide segragation below ≈240 K going along with a strong current imbalance, while poor electron transport in C60 dominates.
Ozen S, Beier E, Peña-Camargo F, Thiesbrummel J, Boccarella G, Sowmeeh PF, Stolterfoht M, Neher D, Brinkmann KO, Riedl T, Lang F.   +10 more
europepmc   +2 more sources

On the rotation of cometary nuclei and small asteroids [PDF]

International Astronomical Union Colloquium, 1985
AbstractThe spin rate distributions of comet nuclei and small asteroids are compared, and it is shown that Whipple’s (1982) finding of a faster average rotation for the asteroid sample was due to observational biases. In fact, the presently available rotational data do not exhibit any clear differentiation among comet nuclei and asteroids, except ...
P. Farinella, P. Paolicchi, V. Zappalà
openaire   +1 more source

Semi-analytical Ansatz for Approximating Dynamics of Asteroid Rotation Approaching Planet [PDF]

Journal of Applied and Computational Mechanics
The main motivation of this research is the analytical exploration of the dynamics of asteroid rotation approaching planet, in view of future approach Apophis 2029 to Earth.
Sergey Ershkov
doaj   +1 more source

An Untargeted Survey of the Rotational Properties of Main-belt Asteroids using the Transiting Exoplanet Survey Satellite (TESS)

The Astronomical Journal, 2023
We present photometric data for minor planets observed by the Transiting Exoplanet Survey Satellite during its Cycle 1 operations. In total, we extracted usable detections for 37,965 objects.
Andrew McNeill, Michael Gowanlock, Michael Mommert, David E. Trilling, Joe Llama, Nicholas Paddock   +5 more
doaj   +1 more source

Preliminary refinement of rotation parameters of asteroids based on photogrammetric processing of on-orbit remote sensing images [PDF]

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
In recent years, asteroid exploration has become an important research direction in the field of deep space exploration. The weak gravitational environment of asteroids, as well as their complex topographic, geomorphic, and dynamic characteristics, pose ...
Z. Peng, Z. Peng, X. Geng, X. Geng, J. Zhang, J. Zhang, Y. Wang, Y. Wang   +7 more
doaj   +1 more source

Asteroid Photometric Phase Functions From Bayesian Lightcurve Inversion

Frontiers in Astronomy and Space Sciences, 2022
Photometry is an important tool for characterizing the physical properties of asteroids. An asteroid’s photometric lightcurve and phase curve refer to the variation of the asteroid’s disk-integrated brightness in time and in phase angle (the Sun-asteroid-
Karri Muinonen, Karri Muinonen, Elizaveta Uvarova, Julia Martikainen, Antti Penttilä, Alberto Cellino, Xiaobin Wang, Xiaobin Wang   +7 more
doaj   +1 more source

The Alinement of Asteroid Rotation [PDF]

International Astronomical Union Colloquium, 1971
Data have been accumulating since the beginning of this century that indicate that most, if not all, large asteroids have periodic lightcurves. The variations that are seen have periods of the order of several hours and can be understood as being caused by bodily rotation, accompanied by changes in shape and/or surface properties. Because corresponding
openaire   +1 more source

Asteroid Deflection by Leveraging Rotational Self-Energy [PDF]

Journal of Spacecraft and Rockets, 2021
A novel concept for the deflection of rotating asteroids is presented, based on the conversion of the asteroid rotational kinetic energy into translational kinetic energy. Such conversion is achieved using an orbital siphon, a tether-connected chain of masses, arranged vertically from the asteroid surface, which exploits the rotation of the asteroid ...
Viale, Andrea, McInnes, Colin, Bailet, Gilles, Ceriotti, Matteo   +3 more
openaire   +1 more source

THE ASTEROIDS' ROTATION PARAMETERS DETERMINATION USING PHOTOMETRICAL DATA

Odessa Astronomical Publications, 2017
Presented a new method of determination of the asteroid rotation parameters.
N. R. Burlak, T. A. Golubovskaya, N. L. Koshkin, S. L. Strahova   +3 more
doaj   +1 more source

Collisional and Rotational Disruption of Asteroids [PDF]

Advanced Science Letters, 2011
Asteroids are leftover pieces from the era of planet formation that help us understand conditions in the early Solar System. Unlike larger planetary bodies that were subject to global thermal modification during and subsequent to their formation, these small bodies have kept at least some unmodified primordial material from the solar nebula.
Walsh, K., Michel, P., Richardson, D.
openaire   +3 more sources