Zobrazeno 1 - 10
of 121
pro vyhledávání: '"Long period comets"'
Autor:
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
Publikováno v:
The Planetary Science Journal, Vol 5, Iss 12, p 273 (2024)
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. Since 2020 August, the Las Cumbres Observatory (LCO
Externí odkaz:
https://doaj.org/article/73afdd1b97b8408691bd9ab0ff73929b
Publikováno v:
The Planetary Science Journal, Vol 5, Iss 12, p 264 (2024)
Comet C/2020 F3 (NEOWISE) reached perihelion on 2020 July 3 at 0.29 au and exhibited a highly structured dust tail. Using a simplified Finson–Probstein model, structures such as striae, observed in the tail in images obtained by the Parker Solar Pr
Externí odkaz:
https://doaj.org/article/b41b3b67ea8f4ae9a4a4c2f7dab5c25f
Publikováno v:
The Planetary Science Journal, Vol 5, Iss 11, p 242 (2024)
With orbital periods longer than 200 yr, most long-period comets (LPCs) remain undiscovered until they are in-bound toward perihelion. The comets that pass close to Earth’s orbit are potentially hazardous objects. Those with orbital periods up to
Externí odkaz:
https://doaj.org/article/17831847563343d2b8b55feb34655a34
Autor:
Anastasios Gkotsinas, David Nesvorný, Aurélie Guilbert-Lepoutre, Sean N. Raymond, Nathan Kaib
Publikováno v:
The Planetary Science Journal, Vol 5, Iss 11, p 243 (2024)
Born as ice-rich planetesimals, cometary nuclei were gravitationally scattered onto their current orbits in the Kuiper Belt and the Oort Cloud during the giant planets’ dynamical instability in the early stages of our solar system’s history. Here
Externí odkaz:
https://doaj.org/article/45ca7fd8e8cd4fe6a309a2132121cfe0
Autor:
Yuna G. Kwon, Stefano Bagnulo, Johannes Markkanen, Ludmilla Kolokolova, Jessica Agarwal, Manuela Lippi, Zuri Gray
Publikováno v:
The Astronomical Journal, Vol 168, Iss 4, p 164 (2024)
Comets, relics from the early solar system, consist of dust and ice. The ice sublimates as comets approach the Sun, ejecting dust from their nuclei seen as activity. Different volatiles sublimate at different Sun–comet distances and eject dust of u
Externí odkaz:
https://doaj.org/article/f268c6e9a60b450c86314c63c1b840ce
Publikováno v:
The Astrophysical Journal, Vol 963, Iss 2, p 90 (2024)
C/2019 Y4 (ATLAS) is an Oort cloud comet with an orbital period of ∼5895 yr. Starting in 2020 March, its nucleus underwent disintegration. In order to investigate the gas and dust properties of C/2019 Y4 (ATLAS) during its disintegration, we obtain
Externí odkaz:
https://doaj.org/article/c046b96e5fcd4eea93a98ff0148c5be8
Publikováno v:
The Astronomical Journal, Vol 167, Iss 3, p 140 (2024)
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–Bernste
Externí odkaz:
https://doaj.org/article/9aa944ed37f5475d969a0e2f803263f7
Autor:
Dave G. Milewski, Joseph R. Masiero, Jana Pittichová, Emily A. Kramer, Amy K. Mainzer, James M. Bauer
Publikováno v:
The Astronomical Journal, Vol 167, Iss 3, p 99 (2024)
Hyperactive comet activity typically becomes evident beyond the frost line (∼3–4 au) where it becomes too cold for water-ice to sublimate. If carbon monoxide (CO) and carbon dioxide (CO _2 ) are the species that drive activity at sufficiently lar
Externí odkaz:
https://doaj.org/article/b99c0b3a4d2f43eaad820c63565c7327
Publikováno v:
The Planetary Science Journal, Vol 4, Iss 12, p 242 (2023)
As comets journey into the inner solar system, they deliver particulates and volatile gases into their comae that reveal the most primitive materials in the solar system. Cometary dust particles provide crucial information for assessing the physicoch
Externí odkaz:
https://doaj.org/article/d6949b071bad4ddcacd7df1a04fdfca6
Autor:
Man-To Hui, Michael S. P. Kelley, Denise Hung, Tim Lister, Joseph Chatelain, Edward Gomez, Sarah Greenstreet
Publikováno v:
The Astronomical Journal, Vol 166, Iss 2, p 47 (2023)
Long-period comet C/2018 F4 (PANSTARRS) was observed to show duplicity of its inner region in 2020 September, suggestive of a splitting event. We here present analyses of our observations of the comet taken from the LCO Outbursting Objects Key projec
Externí odkaz:
https://doaj.org/article/5dbdc6c853484c4aaf0624973da86689