Results 81 to 90 of about 586,778 (202)

Stellar encounters in the solar neighbourhood and the special case of GJ 710

Astronomy & Astrophysics
Aims. We present a comprehensive characterisation of close stellar encounters in the solar vicinity, with a particular focus on placing the predicted fly-by of GJ 710 in context.
Fernandez-Puig Eloi, Morales Juan Carlos, Ribas Ignasi, Laguna-Miralles Júlia, Guijosa Pol   +4 more
doaj   +1 more source

Mega Mengelilingi Sistem Solar_ Awan Oort: E-ESTIDOTMY

, 2023
Awan Oort ialah lapisan sfera objek berais yang mengelilingi Matahari, bintang, dan berukuran pada jarak antara kira-kira 2,000 hingga 100,000 unit astronomi (AU) dari Matahari.
Rashid Ating (14644316), Rashid Ating
core   +1 more source

A Dormant Captured Oort Cloud Comet Awakens: (18916) 2000 OG44

The Astrophysical Journal Letters
We report the discovery of activity emanating from (18916) 2000 OG _44 (alternately designated 1977 SD), a minor planet previously reported to be both an extinct comet and an asteroid on a cometary orbit. We observed 2000 OG _44 with a thin tail oriented
Colin Orion Chandler, William J. Oldroyd, Chadwick A. Trujillo, Dmitrii E. Vavilov, William A. Burris   +4 more
doaj   +1 more source

Serendipitous Archival Observations of a New Ultradistant Comet C/2019 E3 (ATLAS)

The Astronomical Journal
We identified a new ultradistant comet C/2019 E3 (ATLAS) exhibiting preperihelion cometary activity at heliocentric distances ≳20 au, making it the fourth member of this population after C/2010 U3 (Boattini), C/2014 UN _271 (Bernardinelli–Bernstein), and
Man-To Hui, Robert Weryk, Marco Micheli, Zhong Huang, Richard Wainscoat   +4 more
doaj   +1 more source

The chaotic dynamics of comets and the problems of the Oort cloud [PDF]

, 1991
The dynamic properties of comets entering the planetary zone from the Oort cloud are discussed. Even a very slight influence of the large planets can trigger stochastic cometary dynamics.
Zaslavskiy, G. M., Sagdeev, Roald Z.
core  

A JWST Study of the Remarkable Oort Cloud Comet C/2017 K2 (PanSTARRS)

The Planetary Science Journal
Comets, during their journeys into the inner solar system, deliver volatile gases, organics, and particulates into their comae that provide crucial information for assessing the physicochemical conditions in the outer disk from which they formed. Here we
Charles E. Woodward, Dominique Bockélee-Morvan, David E. Harker, Michael S. P. Kelley, Nathan X. Roth, Diane H. Wooden, Stefanie N. Milam   +6 more
doaj   +1 more source

Strength Ratios of Diffuse Interstellar Bands in Slightly Reddened Objects

Universe
The disk of the Milky Way fills the interstellar medium in the form of discrete clouds, many (∼30) light-years across. The average density of this medium is 1 hydrogen atom per cm3 (Oort limit), in the clouds—several dozen atoms, and between the clouds ...
Jacek Krełowski, Arkadii Bondar
doaj   +1 more source

The outer solar system

EPJ Web of Conferences, 2009
The outer solar system extends beyond a heliocentric distance of 5 AU. It contains the giant planets and their systems (rings and satellites), the Kuiper belt, the comets (except those which approach episodically the inner solar system) and, at its outer
Encrenaz T.
doaj   +1 more source

Comet fading begins beyond Saturn. [PDF]

Sci Adv, 2022
Kaib NA.
europepmc   +1 more source

Discovery of a Dwarf Planet Candidate in an Extremely Wide Orbit: 2017 OF201

The Astrophysical Journal Letters
We report the discovery of a dwarf planet candidate, 2017 OF201, currently located at a distance of 90 au. Its orbit is extremely wide and extends to the inner Oort cloud, with a semimajor axis of 830 au and a perihelion of 45 au, precisely determined ...
Sihao Cheng, Jiaxuan Li, Eritas Yang
doaj   +1 more source