Let X1,X2, ... be independent and symmetric random variables such that Sn = X1+ ...+Xn converges to a finite valued random variable S a.s. and let S = sup1≤n<∞ Sn (which is finite a.s.). We construct upper and lower bounds for sy and s ∗ y, the upper 1 y th quantile of Sy and S , respectively. Our approximations rely on an explicitly computable quantity q y for which we prove that 1 2 q y/2 < s...

The constellations on the Farnese Atlas are based on the now-lost star catalogue of Hipparchus. This is proved by S1.1) the virtually perfect match with the constellation figures used by Hipparchus and only for these, S1.2) the perfect match with the date of Hipparchus (with the exclusion of all other known candidate sources), S1.3) the requirement that the source be a star catalogue such as th...

ABSTRACT A high precision star sensor system is presented for accurate attitude determination on the SUNSAT microsatellite. The design constraints were low cost, mass, volume and power. The principle of operation is to image stars and match the observed constellation to a star catalogue. A set of corresponding observed and reference vectors are used to feed an extended Kalman filter for full at...

We consider a point pattern matching problem occuring in astronautics: Given are pictures from a camera of unknown orientation, showing a section of the starry sky. We want to determine the orientation of the camera by matching the constellations in the pictures with a star catalogue. This problem occurs for satellite attitude determination with star eld sensors. We present a new solution, whic...

We consider a point pattern matching problem occuring in astronautics: Given are pictures from a camera with unknown orientation, showing a section of the starry sky. We want to determine the orientation of the camera by matching the constellations in the pictures with a star catalogue. This problem occurs for satellite attitude determination with star eld sensors. We present a new solution, wh...

We present Strr omgren uvby and H photometry for a set of 575 northern main sequence A type stars, most of them belonging to the Hipparcos Input Catalogue, with V from 5 m to 10 m and with known radial velocities. These observations enlarge the catalogue we began to compile some years ago to more than 1500 stars. Our catalogue includes kinematic and astrophysical data for each star. Our future ...

We present a new catalogue of variable stars compiled from data taken for the University of New South Wales Extrasolar Planet Search. From 2004 October to 2007 May, 25 target fields were each observed for 1–4 months, resulting in ∼ 87000 high precision light curves with 1600–4400 data points. We have extracted a total of 850 variable light curves, 659 of which do not have a counterpart in eithe...