The IARU provides a frequency coordination service for satellites proposing to operate in the Amateur-satellite Service allocations such as 144.000-144.025, 145.8-146 and 435-438 MHz.
Contact email addresses, an application form, and ITU tutorial are available at https://www.iaru.org/reference/satellites/
The status of current applications can be seen at https://iaru.amsat-uk.org/index.php
IARU Amateur Satellites Wiki https://www.iaru-r1.org/wiki/Amateur_satellites
IARU Region 1 Wiki http://www.iaru-r1.org/wiki/