Full ​​​​​Comet Environment Working Group (CEWG) Meeting

2025

1) 23rd January 2025, online, ~30 people

  1. INTRODUCTION

Elena welcomes the participants and introduces the meeting. First meeting of the year 2025. Soon the new IDS will be appointed. Overview of the last sub-WG meetings since the last Full CEWG, which took place during the Comet-I SWT on the last November in ESTEC.

  1. REPORTS from sub-Working Groups:
  1. Nucleus WG (Aurelie): In her working groups they have decided on what topics to concentrate in the following months/years - Nucleus rotation - Processes [cometary activities /brightness]
  2. Near-Environment WG (Jean-Baptiste): Ivano's phase function paper made good progresses The next version will be issued next week
  3. Far-Environment WG (Charlotte): Some superposition on the activities with the target working group to be resolved

  1. Discussion

Elena highlights that is important to prioritize the interactions with the instrument leads (for the models?).

  1. NEXT Meetings & Conferences

The next Full team meeting will be in ESTEC 31 March - 1 April, during the #6 Comet-I SWT. For all the other meeting list, see slides.

Conferences:

  • EPSC-DPS Helsinki September; Discussion with Colin about proposal of sessions related to comets and the Comet Interceptor mission;
  • Dust meeting in Venice, Giovanna Rinaldi explains the organization, venue, deadline for talk titles, and registration.
  • Oort Workshop in Stockolm (a couple of people will participate)

  1. REMINDER of the Special Issues deadlines

  1. AOB

 

2) 27th March 2025, online, ~30 people

  1. INTRODUCTION

Elena welcomes the participants and introduces the meeting. This is the second meeting of the year 2025, and new changes in the team has occurred. The new IDS for the Comet Environment WG was recently appointed, and is Sonia Fornasier, from the Université Paris Cité. Furthermore, Raphael Marschall took over the chairing of Near-Environment sub-WG or few months.

Overview of the last sub-WG meetings since the last Full CEWG (23rd January 2025).

  1. REPORTS from sub-Working Groups:
  1. Nucleus WG (Aurelie): Main topic of research are characterizing cometary brightning and make prediction on how it varies with solar distance. Any modelling activity should be kept simple in the first investigation, and the outputs should be compared and fitted to observational data.
  2. Near-Environment WG (Raphael): Ivano's phase function paper was submitted to the PSS Sp. Issue. It includes the development of a composite phase function for the dust, obtained with a compound Henyey-Greenstein curve and compared it with previous models which were not including recent literature data constituting fine follow-ups of comets at small and large phase angles.
  3. Far-Environment WG (Charlotte): Focus is comparing different simulations and verifying which are best suited for a given scenario, with the goal of a better understanding of the outputs vs. the input assumptions.

  1. Dust Meeting (18-20 March, 2025 in Venice)

Giovanna presented a short overview about the Dust meeting. The scientific programme was distributed over seven sessions, and consisted on talks investigating cometary dust from the observational, modelling, and laboratory analysis approaches. Of importance was the round table for each dedicated topic. A theather art perfomance developed by Stavro was part of the meeting. Next one will be on March 2026, in Graz (Austria).

  1. Discussion

Elena highlights that is important to prioritize the cooperation between the various sub-groups to improve our predictive cometary activity by means of multiple models, and strengthn the interactions with the instrument leads.

  1. NEXT Meetings & Conferences

This Full team meeting is in replace of the one usually taking place during the Comet-I SWT. In the week after (31 March - 1 April), a summary report during the #6 Comet-I SWT in ESTEC will be given. For the list on next meeting and conferences, see meeting slides.

  1. Special Issues

It is still under debate the possibility of an extention of the deadline for the Universe journal (refer to Stavro Ivanovski)

  1. AOB

 

3) 22nd May 2025, online,

MINUTES