10 April 2013. NOAA-18 (N): Launched 20 May 2005 into a 470 nmi afternoon orbit and replaced NOAA-16 as the PM primary spacecraft on 30 August 2005. NOAA-19 (N Prime): Launched 6 February 2009 into a 470 nmi afternoon orbit and replaced NOAA-18 as the PM primary spacecraft on 2 June 2009. References External links NASA page on TIROS NASA page on ESSA NASA page on ITOS and NOAA NASA page on TIROS-N NASA Goddard POES Program - POES Home NOAA Office of Satellite Operations - POES TIROS-1 50th Anniversary & Resources on Satellite Meteorology NASA's YouTube video of TIROS-1