Results 71 to 80 of about 586,778 (202)

Brightness Behavior of Distant Oort Cloud Comets

The Planetary Science Journal
Dynamically new comets provide important insights into the conditions of the presolar nebula and its evolution, as they are believed to have experienced minimal solar heating before their discovery.
Carrie E. Holt, Matthew M. Knight, Michael S. P. Kelley, Tim Lister, Quanzhi Ye, Colin Snodgrass, Cyrielle Opitom, Rosita Kokotanekova, Megan E. Schwamb, Matthew M. Dobson, Michele T. Bannister, Marco Micheli, Stefanie N. Milam, Derek C. Richardson, The LCO Outbursting Objects Key (LOOK) Project, Edward Gomez, Joseph P. Chatelain, Sarah Greenstreet   +17 more
doaj   +1 more source

Is the Recently Proposed Mars-Sized Perturber at 65–80 AU Ruled Out by the Cassini Ranging Data?

Frontiers in Astronomy and Space Sciences, 2017
Recently, the existence of a pointlike pertuber PX with 1 m♂ ≲ mX ≲ 2.4 m⊕ (the symbol “♂” denotes Mars) supposedly moving at 65–80 AU along a moderately inclined orbit has been hypothesized in order to explain certain features of the midplane of the ...
Lorenzo Iorio
doaj   +1 more source

Impact of Inter‐Basin Interactions on ENSO‐Associated Hadley Circulation Adjustments

Geophysical Research Letters, Volume 53, Issue 3, 16 February 2026.
Abstract El Niño events are usually accompanied by Hadley circulation (HC) adjustment extending beyond the Pacific to the Atlantic and Indian Oceans. These remote HC adjustments arise through both pure atmospheric and ocean‐atmosphere coupling mechanisms, yet their relative importance remains unclear.
Yujie Miao, Tao Lian, Ya Wang, Yueyue Yu, Yurong Hou, Weiqi Wang, Yadi Li, Weichen Tao, Xichen Li   +8 more
wiley   +1 more source

The flux of long-period comets and the initial orbital distribution of the Oort cloud

, 2014
International audienceSeveral simulations have been performed on the evolution of the Oort cloud of comets over the age of the solar system using 10 different stellar encounter sequences. An innermost part of the cloud was also introduced (semimajor axes
Valsecchi, Giovanni B., Fouchard, Marc, Rickman, Hans, Froeschlé, Christiane   +3 more
core   +3 more sources

Gravitational Time Potential Energy

Advances in Astronomy, Volume 2026, Issue 1, 2026.
We extend the Einstein equivalence principle via a supplementary local energy equivalence postulate and propose the gravitational time potential energy (GTP) framework: a time‐dimensional scalar potential accumulating continuously with the proper duration of gravitational action. This framework may provide a potential classical interpretation for alpha
Ne Allen, Mohammad Rezwan Habib
wiley   +1 more source

Oort Cloud and Long-Period Comets

, 2012
I will summarize recent work on the shape of the Oort spike and dynamical modeling of comet injection from the Oort Cloud. This will highlight the roles of stellar and planetary perturbations together with the Galactic tides.
Rickman, H.,
core  

A Predicted Dearth of Majority Hypervolatile Ices in Oort Cloud Comets

, 2022
International audienceWe present new, ice species-specific New Horizons/Alice upper gas coma production limits from the 2019 January 1 MU69/Arrokoth flyby of Gladstone et al. and use them to make predictions about the rarity of majority hypervolatile (CO,
Grundy, W. M., Cruikshank, D. P., Lewis, B. L., Dello-Russo, N., Linscott, I. R., Sandford, S. A., Neveu, M., Kavelaars, J. J., Britt, D. T., Mousis, O., Parker, J. M., Mcnutt, R. L., Lyra, W., Stern, S. A., Weaver, H. A., Mckinnon, W. B., Olkin, C. B., Elliott, H. A., Umurhan, O., Spencer, J. R., Horanyi, M., Schmitt, B., Pendleton, Y. J., Gladstone, G. R., Keane, J. T., Young, L. A., Steckloff, J. K., Lisse, C. M., Earle, A. M., Cheng, A. F., Binzel, R. P., Moore, J. M., El-Maarry, M., I. R. Linscott, O. Umurhan, O. Mousis, G. R. Gladstone, M. Horanyi, N. Dello-Russo, R. P. Binzel, C. M. Lisse, D. P. Cruikshank, S. A. Sandford, B. L. Lewis, J. M. Parker, M. Neveu, W. Lyra, B. Schmitt, J. R. Spencer, J. K. Steckloff, H. A. Weaver, L. A. Young, A. F. Cheng, Y. J. Pendleton, W. B. McKinnon, W. M. Grundy, D. T. Britt, C. B. Olkin, M. El-Maarry, J. T. Keane, S. A. Stern, R. L. McNutt, J. J. Kavelaars, A. M. Earle, J. M. Moore, H. A. Elliott   +65 more
core   +1 more source

Coma Volatile Composition and Thermal Physics in Comet C/2022 E3 (ZTF) Measured near Closest Approach to Earth with NASA-IRTF

The Planetary Science Journal
The 2023 perihelion passage of comet C/2022 E3 (ZTF) afforded an opportunity to measure the abundances and spatial distributions of coma volatiles in an Oort cloud comet at high spatial resolution near its close approach to Earth ( ${{\rm{\Delta }}}_ ...
Nathan X. Roth, Michael A. DiSanti, Boncho P. Bonev, Neil Dello Russo, Erika L. Gibb, Ronald J. Vervack Jr., Mohammad Saki, Adam J. McKay, Hideyo Kawakita, Stefanie N. Milam, Martin A. Cordiner, Kiernan D. Foster   +11 more
doaj   +1 more source

A novel high‐throughput digital morphological phenotyping method for evaluating growth traits in rice

The Plant Phenome Journal, Volume 8, Issue 1, December 2025.
Abstract High‐throughput and noninvasive phenotyping methods are promising technology for improving efficiency in plant research and breeding. In this study, we evaluated the performance of a digital phenotyping system (DPS) based on three‐dimensional (3D) model reconstruction for quantifying key growth traits in rice (Oryza sativa).
Sorawich Pongpiyapaiboon, Kenji Aoki, Masatsugu Hashiguchi, Ryo Akashi, Yuji Kishima, Hidenori Tanaka   +5 more
wiley   +1 more source

Centimeter-wave OH Observations of Comets 12P/Pons-Brooks and C/2023 A3 (Tsuchinshan-ATLAS) with FAST

The Astronomical Journal
We present centimeter-wave spectroscopic observations of the OH 18 cm lines in two bright comets, 12P/Pons-Brooks and C/2023 A3 (Tsuchinshan-ATLAS), conducted with the Five-hundred-meter Aperture Spherical radio Telescope (FAST) during their 2024 ...
Long-Fei Chen, Juncen Li, Zhen Wang, Jian-Yang Li, Wing-Huen Ip, Zhong-Yi Lin, Bin Yang, Chao-Wei Tsai   +7 more
doaj   +1 more source