ESO telescopes moderately affected by the constellations under development, Astronomers have recently raised concerns about the effects of satellite megastars on scientific research. To better understand the effects of these constellations on astronomical observations.

The study examined a total of 18 representative satellite constellations developed by SpaceX, Amazon, OneWeb, and others, which included a total of more than 26,000 satellites.

The effect is more pronounced with long exposures (from about 1000 seconds), where up to 3% can be destroyed at dusk, the time between sunrise and sunrise and between sunset and dusk.

Shorter exposure will be less affected, with less than 0.5% of this type of observation affected.

Observations made at other times of the night will also be less affected because satellites are under the shadow of the earth and therefore will not turn on.

The study also found that broadband studies, especially with large telescopes, can have the greatest impact.

For example, up to 30% to 50% of Vera S. Rubin’s National Science Foundation exposure (non-ESO facilities) will be greatly affected, depending on the time of year, night time, and simplification of study assumptions. ESO telescopes moderately affected by the constellations under development.

This study shows that around 1,600 constellations will be above the horizon of a medium-sized observatory, most of them 30 degrees from the horizon in the sky.

There are about 250 constellations in the upper part of the sky where most astronomical observations are made.

ESO studies show brightness for all of these satellites. With this assumption, up to 100 satellites can be bright enough to be seen with the naked eye at dusk, about 10 of which will be higher than 30 degrees above sea level.

Overall, this new satellite constellation will double the number of satellites seen in the night sky, with the naked eye above 30 degrees.

These figures do not include satellite trains that were seen immediately after launch. Although spectacular and alive, they are short-lived and are only seen shortly after sunset or before sunrise and anytime only from very limited regions of the world. ESO telescopes moderately affected by the constellations under development.

Satellite constellations also affect radiation, millimeters, and submillimeter observatories, including the Atacama Large Millimeter / Submillimeter (ALMA) and the Atacama Pathfinder Experiment (APEX).

ESO supports the development of a regulatory framework that ultimately ensures the harmonious coexistence of many promising technological advances in Earth’s orbit under conditions that allow humans to continue to observe and understand the universe.