HST’s Optical Telescope Assembly (OTA) did not perform as designed because the primary mirror was manufactured with about one-half wave of spherical aberration.
For Cycle 24, the new BAR5 position on the 50Coron aperture location is supported within APT to allow inner working angles as small as 0.25” and with certain observing techniques can reach contrasts as deep as 10-6 beyond 0.55".
Please contact the HST Help Desk for assistance. We encourage users to access the new web portal where you can submit your questions directly to the appropriate team of experts.
We have performed time series analyses on more than 4500 sets of Hubble Space Telescope (HST) Fine Guidance Sensor (FGS) data, obtained from about 3600 guide stars in the period from August 1992 to December 1995.