IAU Symposium 355 aims to survey the denizens of the low surface brightness skies, at all wavelengths and resolutions, to show the richness of physical processes taking place in this regime, which has not been fully explored. From the Zodaical light in the Solar System all the way to the cosmological backgrounds, and from the contributions of amateurs to space-based instrumentation, this Symposium will provide participants with a broad glimpse of one of the few last niches that remain to be discovered.





The SOC has been delayed in reaching decisions about the abstract selection, and in particular about which abstracts can be scheduled as oral presentations. We now expect to be able to send out the results of this selection to participants early in the week starting April 15th. The SOC apologises for this delay.

As a result of this delay, the deadline for early-bird registration fee payment has been changed from April 1st to April 20th. If paid by that date, the fee will be 275 euros, and after 20 April the higher fee of 325 euros will be charged.



We remind you that the early-bird payment deadline for IAU Symposium 355, 8-12 July 2019 in Tenerife, is on the first of April 2019. After that date, the registration fee will go up from the early-bird rate of 275 euros to 325 euros. To take advantage of the cheaper rate, please visit the registration pages with the account details you set up when starting your registration and pay with credit card or by bank transfer.

If you have not already done so, we also urge you to complete your travel and lodging arrangements. You can find information on this on the conference webpage http://www.iac.es/congreso/iaus355/

We have been made aware of a scam where attendees are contacted with plausible-sounding information regarding their hotel booking for IAUS355, and are asked to provide their details including credit cards. Please be aware that the IAUS355 organisation, nor our partners Viajes el Corte Ingles, will ever contact you out of the blue with hotel reservations that you should confirm. You can use our conference webpage to make hotel reservations, but we will never take the initiative.

As these scammers find participant / invited speaker names from public conference webpages, including the list of invited speakers and the scientific programme, you cannot assume you will be immune to attack.

If you are targetted, please ignore the scam and let us know. If you suspect you have already been targetted you may want to investigate further and/or contact your credit card company.

3. Abstract submission and grant application are now closed

4. First and second announcements published here

5. Registration and calls for grant applications and abstract open


Ethics and Anti-harassment statement


The organisers consider this IAU Symposium to be a privileged occasion for free and frank interchange of scientific ideas, as well as for the nurturing and creation of professional and social contacts. Any abuse of power or inappropriate behaviour has no place at IAU Symposium 355.

We specifically refer to the IAU anti-harassment policy and the  EAS Ethics Statement and Guidelines for Good Practice. These will apply during IAU Symposium 355. By registering for this conference, all participants confirm that they have read the documents and that they will follow its recommendations.