Picometer knowledge transfer: overview and status
The Picometer Knowledge Transfer testbed is one of several technology testbeds that will help to prove technology readiness for the Space Interferometry Mission (SIM).
picometer interferometer SIM↗
Engineering topics
Oseas, J. M.
Publications and source records attributed to Oseas, J. M..
Astrometric beam combiner
Explore the source record for details and available documents.
Space Interferometry Mission beam combiner↗
Observations from 1982 of facular limb darkening and excess solar oblateness
Observations of facular regions on 35 days during 1982 obtained with the Extreme Limb Photometer are reported. The data were obtained at a wavelength of 0.53 microns with two apertures, No. 1 covering 36 arcsec and No. 2 covering 11 arcsec, inwards from the limb. The mean contrast of the faculae closer to the limb (aperture 2) is 1.51 + or - 0.23 times that from aperture No. 1. This contrast ratio can be fit to a 1/ms curve. These results are consistent with those from 1975 and 1979 observations and may be consistent with the facular limb-darkening function determined by Libbrecht and Kuhn (1984, 1985) if the data are normalized by the area of the solar surface. However, no calibrations or corrections are required to obtain the mean facular contrast presented here.
Chapman, G. A.↗