Terzan 5 is one of the brighter Terzan globular
clusters, a group of heavily obscured globular
clusters discovered by Agop Terzan in 1968.
They are extremely reddened and best studied in the
infrared. Once thought to be totally impossible
for amateur observers, most of them have now been
Terzan 5 has an apparent magnitude of 12.8 and
is approximately 1' in diameter.
This is a LRGB exposure with the luminance a
combination of near infrared luminance (150m) and
normal luminance (90m) with R=G=B=90m.
A 14.5" RCOS Ritchey Chretien at F9 and a SBIG
STXL6303 camera were used. The filters were
Astrodon series 2.