This composite image is based on observations from the New Horizons Ralph/LEISA instrument made at 6:25 a.m. EDT on July 14, 2015, when New Horizons was 50,000 miles (81,000 kilometers) from Charon. The spatial resolution is 3 miles (5km) per pixel. The LEISA data were downlinked October 1 4, 2015, and processed into a map of Charon s 2.2 micron ammonia-ice absorption band. ... The ammonia absorption map from LEISA is shown in green on the LORRI image. ...

... The Science Operation Department is composed of Astronomers, Telescope Instruments Operators(TIOs) and Data Handling Administrators(DHAs). ... Astronomers have proposed several methods to quantitatively measure the amount of turbulence above the telescope, which the most common ones is Differential Image Motion Monitor (DIMM). In optical testing, the Hartmann test is the common method to test the quality of optical components. ... Hartmann mask consists of 48 lenses. ...

... The solution of this so-called "inverse scattering problem" is conjugated with solving the direct scattering problem, which input parameters are microphysical properties of scatterers whereas output parameters are characteristics of scattered radiation (scattering matrix). ... The trained Figure 1: Cluster form for 10 and 20 particles. perceptron allows calculating the approximate values of the expansion coefficients for any input data from the data range that was used for neural network training. ...

V. I. Arnold, Ordinary differential equations. "; $programm =" . Processes described by ODE. ... General theory: existence and uniqueness of solutions in real and complex domains. Small parameter method. Linear theory. Phase flows of linear vector fields and exponentials of linear operators. Linear equations of higher order. ... Small amplitude oscillations. Stability of singular and fixed points. Limit cycles and their stability. ... Linear equations in the complex domain. ...

... The described algorithm is suitable for measurements of complex images of stars. ... a) the zero-based number of stars in the complex (multicentric) image, . b) set of preliminary coordinates - x i , y i , for all stars, index i is number of a star, . ... i - index of a star in the complex image; . ... These parameters are calculated by a nonlinear method of a least squares.The main output parameters of this algorithm are x i , y i ; where the index i is number of a star in the multicentric image. ...

... In electron-positron colliders, effect of the lattice modification by opposing bunch focusing on the equilibrium radiation emittance is important at high values of the space charge parameter, so one should correctly evaluate this dynamic radiation emittance of the weak beam, which may differ a lot from the nominal emittance, already in the linear beam-beam force model. ... The linearized beam-beam force is equivalent to focusing insertion in linear lattice of the collider. ...

... Астронет | ... The formation of chemical peculiarities in stellar atmospheres . ... Asymmetry in the variability of radio sources towards the centre and anti-centre of the galaxy . ... Mathematical methods in studying the structure and dynamics of gravitating systems . ... Mathematical methods in studying the structure and dynamics of gravitating systems: Preface . ... On the astronomical applications of the dynamics of hierarchical systems . ... Dynamics of gaseous disks of spiral galaxies . ...

... 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. ...