The process of determining the number and characteristics of sources in astronomical images is so fundamental to a large range of astronomical problems that it is perhaps surprising that no standard procedure has ever been defined that has well understood properties with a high degree of statistical rigour on completeness and reliability. ... In this analysis we present results from testing such algorithms as implemented in the SExtractor, Selavy (Duchamp), and sfind tools on simulated data. ...

... Posts tagged ?incompleteness? ... Comment . ... The notions of missing data are overall different between two communities. ... Astronomers?I?m not sure how they think but my impression so far is that a missing value in one attribute/variable from a object/observation/informant, all other attributes related to that object become useless because that object is not considered in scientific data analysis or model evaluation process. ... 2 Comments . ... Entries RSS . ... Entries (RSS) and Comments (RSS)...

DIGITAL WDC EXCHANGE FORMAT . FOR OBSERVATORY 1.0 MINUTE VALUES 1. ... DATA-1 .. DATA-60 are 1-minute values of the given element for that hour. ... Typically, digital 1-minute values received by WDCs from organizations operating automatic magnetic observatory instruments are averages of more frequendy sampled values, e.g. 10-second point samples. ... If the method used to obtain 1-minute average values is important to a user, the WDC will assist in determining the exact procedure applied. ...

... Space Research Institute . ... Main research and development work completed in 2009 and ready for implementation . ... Development of the Northern Eurasia land cover map based on medium spatial resolution satellite data. ... The research and development has been completed of the first in Russia and in the whole world high-speed digital streams decoder for space and satellite channels with extremely high noise levels. ... Main research and development work completed in 2008 and ready for...

... Complete content for online Mercury is available to ASP members and institutional subscribers . ... The University of Arizona's Astronomy Camps promote an authentic understanding of science, research, and engineering among young students and adults by providing unique, hands-on, immersion adventures in scientific exploration via astronomy and related subjects at high-altitude observatories. ... Kepler: A Harbinger for Astrobiology , Trevor Quirk . ... Editorial, Paul Deans . ...

New images are being released to celebrate the International Year of Light 2015. ... M51: X-ray: NASA/CXC/SAO; UV: NASA/JPL-Caltech; Optical: NASA/STScI; IR: NASA/JPL-Caltech; SNR0519-69.0: X-ray: NASA/CXC/Rutgers/J.Hughes; Optical: NASA/STScI; MSH 11-62: X-ray: NASA/CXC/SAO/P.Slane et al; Optical: DSS; Radio: CSIRO/ATNF/ATCA; Cygnus A: X-ray: NASA/CXC/SAO; Optical: NASA/STScI; Radio: NSF/NRAO/AUI/VLA; RCW 86: X-ray: NASA/CXC/MIT/D.Castro et al, Optical: NOAO/AURA/NSF/CTIO ...