The payment process will be in place by mid-November 2024.

Payment of the fee is open through PayPal from the Argentinian Association of Astronomy (AAA – Asociación Argentina de Astronomía).

The listed deadlines are intended as 23:59:00 Argentina Time (ART = UTC – 3h).

Payment Fees €	Early birds February 2, 2025	Regular Fee June 29, 2025
In-person attendees	270	325
Online attendees	55	55

All participants in IAUS 401 will have free electronic access to the proceedings (the cost is included in the fee). In addition, the coffee breaks, an icebreaker cocktail, and the conference dinner are included for in-person attendees. If you are attending IAUS401 with an accompanying person, contact the LOC (iaus401 at fcaglp.unlp.edu.ar).

Please indicate on the registration form if you would like a hard copy of the proceeding (it will require an extra fee), or contact us later.

The social events for August 9th, 2025, will be announced later and should be paid separately.

If you have a bank account in Argentina, please get in touch with the LOC (iaus401 at fcaglp.unlp.edu.ar) to get the directions for a bank transfer to the AAA’s accounts.