Recent formation and likely cometary activity of near-Earth asteroid pair 2019 PR2-2019 QR6

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F22%3A00555905" target="_blank" >RIV/67985815:_____/22:00555905 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1093/mnras/stab3719" target="_blank" >https://doi.org/10.1093/mnras/stab3719</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1093/mnras/stab3719" target="_blank" >10.1093/mnras/stab3719</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Recent formation and likely cometary activity of near-Earth asteroid pair 2019 PR2-2019 QR6

Popis výsledku v původním jazyce

We studied a newly discovered pair of near-Earth objects (NEOs): 2019 PR2 and 2019 QR6. Based on broad-band photometry, we found these asteroids to be spectrally similar to D-types, a type rare amongst NEOs. We recovered astrometric observations for both asteroids from the Catalina Sky Survey from 2005, which significantly improved their fitted orbits. With these refinements we ran backwards orbital integrations to study formation and evolutionary history. We found that neither a pure gravitational model nor a model with the Yarkovsky effect could explain their current orbits. We thus implemented two models of comet-like non-gravitational forces based on water or CO sublimation. The first model assumed quasi-continuous, comet-like activity after separation, which suggested a formation time of the asteroid pair 300(-70)(+120) yr ago. The second model assumed short-term activity for up to one heliocentric orbit (similar to 13.9 yr) after separation, which suggested that the pair formed 272 +/- 7 yr ago. Image stacks showed no activity for 2019 PR2 during its last perihelion passage. These results strongly argue for a common origin that makes these objects the youngest asteroid pair known to date. Questions remain regarding whether these objects derived from a parent comet or asteroid, and how activity may have evolved since their separation.

Název v anglickém jazyce

Recent formation and likely cometary activity of near-Earth asteroid pair 2019 PR2-2019 QR6

Popis výsledku anglicky

We studied a newly discovered pair of near-Earth objects (NEOs): 2019 PR2 and 2019 QR6. Based on broad-band photometry, we found these asteroids to be spectrally similar to D-types, a type rare amongst NEOs. We recovered astrometric observations for both asteroids from the Catalina Sky Survey from 2005, which significantly improved their fitted orbits. With these refinements we ran backwards orbital integrations to study formation and evolutionary history. We found that neither a pure gravitational model nor a model with the Yarkovsky effect could explain their current orbits. We thus implemented two models of comet-like non-gravitational forces based on water or CO sublimation. The first model assumed quasi-continuous, comet-like activity after separation, which suggested a formation time of the asteroid pair 300(-70)(+120) yr ago. The second model assumed short-term activity for up to one heliocentric orbit (similar to 13.9 yr) after separation, which suggested that the pair formed 272 +/- 7 yr ago. Image stacks showed no activity for 2019 PR2 during its last perihelion passage. These results strongly argue for a common origin that makes these objects the youngest asteroid pair known to date. Questions remain regarding whether these objects derived from a parent comet or asteroid, and how activity may have evolved since their separation.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

<a href="/cs/project/GA20-04431S" target="_blank" >GA20-04431S: Fyzikální a dynamické vlastnosti asteroidů cílených kosmickými sondami, a jejich evoluční dráhy</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

e-ISSN

1365-2966

Svazek periodika

510

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

17

Strana od-do

6033-6049

Kód UT WoS článku

000764893300001

EID výsledku v databázi Scopus

2-s2.0-85125129326