Results 21 to 30 of about 256 (139)

Rotation and Mutual Eclipse Events Season in the Kuiper Belt: (524366) 2001 XR254

The Astronomical Journal
(524366) 2001 XR _254 is a dynamically cold classical Kuiper Belt object that is a nearly equal-sized wide binary whose upcoming mutual event season makes it a particularly valuable target for physical characterization.
Audrey Thirouin, William M. Grundy, Scott S. Sheppard, Keith S. Noll, José María Gómez-Limón, Benjamin Proudfoot   +5 more
doaj   +1 more source

Ozone Production by Electron Irradiation of Regolith Ice: Laboratory Study for the Icy Moons

Journal of Geophysical Research: Planets, Volume 131, Issue 2, February 2026.
Abstract We irradiate fine‐grained regolith pure water ice in ultra high vacuum with 5keV $5\,\text{keV}$ and 10keV $10\,\text{keV}$ electrons to study the radiolysis of water ice. The ice regolith is designed to closely mimic the physical characteristics of the surfaces of the icy moons of the Solar System.
Lorenzo Obersnel, André Galli, Rico G. Fausch, Rafael Ottersberg, Peter Wurz   +4 more
wiley   +1 more source

Large‐Angle Anomalies in the CMB

Advances in Astronomy, Volume 2010, Issue 1, 2010., 2010
We review the recently found large‐scale anomalies in the maps of temperature anisotropies in the cosmic microwave background. These include alignments of the largest modes of CMB anisotropy with each other and with geometry and direction of motion of the solar ssystem, and the unusually low power at these largest scales.
Craig J. Copi, Dragan Huterer, Dominik J. Schwarz, Glenn D. Starkman, Eiichiro Komatsu   +4 more
wiley   +1 more source

Prominent Mid-infrared Excess of the Dwarf Planet (136472) Makemake Discovered by JWST/MIRI Indicates Ongoing Activity

The Astrophysical Journal Letters
We report on the discovery of a very prominent mid-infrared (18–25 μ m) excess associated with the trans-Neptunian dwarf planet (136472) Makemake. The excess, detected by the Mid-Infrared Instrument of the James Webb Space Telescope, along with previous ...
Csaba Kiss, Thomas G. Müller, Anikó Farkas-Takács, Attila Moór, Silvia Protopapa, Alex H. Parker, Pablo Santos-Sanz, Jose Luis Ortiz, Bryan J. Holler, Ian Wong, John Stansberry, Estela Fernández-Valenzuela, Christopher R. Glein, Emmanuel Lellouch, Esa Vilenius, Csilla E. Kalup, Zsolt Regály, Róbert Szakáts, Gábor Marton, András Pál, Gyula M. Szabó   +20 more
doaj   +1 more source

Formation of Asteroid (16) Psyche by a Giant Impact

Journal of Geophysical Research: Planets, Volume 131, Issue 1, January 2026.
Abstract Asteroid (16) Psyche is the largest likely metal‐rich asteroid in the Solar System and the target of the NASA Psyche mission. The mission aims to determine whether the asteroid is the core of a differentiated planetesimal that lost its mantle via a giant impact.
Saverio Cambioni, Benjamin P. Weiss, Namya Baijal, Robert Melikyan, Erik Asphaug, John B. Biersteker, Richard P. Binzel, William F. Bottke, Samuel W. Courville, Linda T. Elkins‐Tanton, David J. Lawrence, José M. G. Merayo, Carol A. Raymond, Mark A. Wieczorek, Maria T. Zuber   +14 more
wiley   +1 more source

Orbit of a Possible Planet X

The Astrophysical Journal
The plausibility of an unseen planet in the outer solar system, and the expected orbit and mass of such a planet, have long been a topic of inquiry and debate.
Amir Siraj, Christopher F. Chyba, Scott Tremaine   +2 more
doaj   +1 more source

Pole‐to‐Pole Vertical Ionospheric Profiles at Jupiter From JWST

Journal of Geophysical Research: Space Physics, Volume 130, Issue 8, August 2025.
Abstract We present the first pole‐to‐pole observations of Jupiter's ionosphere, capturing dawn and dusk vertical structure up to 5,000 km altitude using the James Webb Space Telescope (JWST), simultaneous to Juno's radio occultation experiments (ROX) in September 2023.
Paola I. Tiranti, H. Melin, L. Moore, K. L. Knowles, T. S. Stallard, J. O’Donoghue, K. Roberts, K. Mohamed, E. M. Thomas   +8 more
wiley   +1 more source

Steeper Scattered Disks Buckle Faster

The Astrophysical Journal Letters, 2023
Disks of low-mass bodies scattered by giant planets to large semimajor axis and constant periapsis orbits are vulnerable to a buckling instability. This instability exponentially grows orbital inclinations, raises periapsis distances, and coherently ...
Alexander Zderic, Ann-Marie Madigan
doaj   +1 more source

Influences of Non‐Oberbeck–Boussinesq Effects on Tracer Transport in Icy Ocean Worlds

Journal of Geophysical Research: Planets, Volume 130, Issue 7, July 2025.
Abstract The subsurface oceans on icy satellites are potentially habitable. To understand their habitability, we need to know how tracers with various lifetimes distribute. Convection is the main vehicle for tracer transport, and we expect convection on icy satellites to differ from regular rotating convection, because as pressure increases, water's ...
Shuang Wang, Wanying Kang
wiley   +1 more source

Hunting for Hydrated Minerals on Trans-Neptunian Objects

The Planetary Science Journal
We present new optical reflectance spectra of three potentially silicate-rich trans-Neptunian objects (TNOs). These spectra were obtained with the aim of confirming past hints and detections of λ ∼ 0.7 μ m absorption features associated with the presence
Tom Seccull, Wesley C. Fraser, Dominik A. Kiersz, Thomas H. Puzia   +3 more
doaj   +1 more source