... Fig. 3) suitable for estimating the brightness temperature. ... Ir ­ brightness distribution function; T b ­ brightness temperature estimated from Ir ; Vq ­ visibility function; dq ­ pattern size, estimated from the visibility ratio Vq /V0 ; T b,q ­ brightness temperature corresponding to dq ; T b,min ­ minimum brightness temperature, obtained with V0 = eVq for the Gaussian component and V0 = 2 Vq for the disk and the shell; T b,lim ­ limiting brightness temperature, obtained with V0 = Vq + q . ...

... October Monthly Meeting - Amateur Contributions in the Era of Surveys . ... Thursday, Oct 9, 2008 at 8:00 PM . ... Commercial CCDs and telescopes make this possible at modest cost for bright objects, and large, wide field professionalsystems like PanSTARRS and LSST extend coverage to fainter magnitudes. ... Please join us for a pre-meeting dinner discussion at Changsho, 1712 Mass Ave, Cambridge, MA at 6:00pm before the meeting. ... Oct . ... Copyright (c) Amateur Telescope Makers of Boston, Inc. ...

The monitoring of the optics quality of DIMM instrument V. Kornilov, B. Safonov May 24, 2010 1 Intro duction A quantitative theory of measurement of optical turbulence (OT) with Differential Image Motion Monitor (DIMM) is based on certain priori assumptions [1]. ... Bottom: behavior of the instrumental Strehl's number for the left (triangle to the left) and right (triangle to the right) DIMM images during the period of measurement the maintenance of an additional correction factor seems superfluous. ...

Sloan Digital Sky Survey Telescope Technical Note 19970527 Walter Siegmund . ... Pointing Error Budget . ... The interleaved strips and adjacent stripes overlap about 1 arc minute. ... However, a 2-D pointing accuracy of 3 arc seconds RMS leads to acceptibly uniform overlap and minimises the number of cases that require special handling (Table 3). ... A guide fiber bundle diameter of 16.5 arc seconds and a pointing accuracy of 3 arc sec RMS results in 99% initial success in acquiring guide stars. ...

... VaST is a software tool for finding variable objects on a series of astronomical images. ... VaST performs object detection and aperture photometry using SExtractor on each image, cross-matches lists of detected stars, performs magnitude calibration with respect to the first (reference) image and constructs a lightcurve for each object. ... VaST FITS image viewer ./pgfv . ... Part I" PZP, vol. ... K. V. Sokolovsky, S. A. Korotkiy; "New Variable Stars Discovered by the NMW Survey" PZP, vol. ...