Next: J.G. Doyle, Research Astronomer Up: Research Previous: C.J. Butler, Research Astronomer Contents . ... Research Highlights . ... John Chambers has refined and expanded an alternative scenario for the formation of the asteroid belt in collaboration with George Wetherill, Carnegie Institution of Washington, USA. Using numerical simulations on computers, they have shown how planets may have formed in the asteroid belt. ...

... 2004 August 27 . The Sedna Scenario . Illustration Credit: R. Hurt ( SSC-Caltech ), JPL-Caltech , NASA . ... Exploring the problem with computer simulations, astronomers Alessandro Morbidelli and Harold Levison suggest that while Sedna was not formed in its current location, it was also not moved there by encounters with other solar system objects. Instead, they find it more likely that Sedna resides in its present orbit because of an encounter with another star . ... About APOD | ...

... Posts tagged ?MCMC? ... There were a few more with chi-square fitting and its error bars but excluded. Continue reading ?[ ArXiv] 4th week, Jan. ... Category: arXiv | Comment . ... This is not dissimilar to the problem of determining the significance of a ?feature? in an image (Connors, A. & van Dyk, D.A., 2007, SCMA IV). ... 2007? ... Category: arXiv , MC , MCMC , Methods | ... Category: Bad AstroStat , Data Processing , Fitting , Frequentist , Methods , Spectral , Stat , Uncertainty | ...

... APOD: 2004 August 27- The Sedna Scenario . ... 27.08.2004 . ... Credit: R. Hurt ( SSC-Caltech ), JPL-Caltech , NASA Explanation: The discovery of Sedna ( aka 2003 VB12 ), the most distant known object orbiting the Sun, presents a mystery . ... Exploring the problem with computer simulations, astronomers Alessandro Morbidelli and Harold Levison suggest that while Sedna was not formed in its current location, it was also not moved there by encounters with other solar system objects. ...

... ATNF Home . ... Parkes radio telescope . ... The Effect of Synchrotron Losses on Multiple Diffusive Shock Acceleration . ... Our sequential procedure for treating synchrotron losses involves neglecting the synchrotron losses so that DSA forms a distribution that extends well beyond the synchrotron cutoff, and then allowing synchrotron losses to modify this distribution. ... The foregoing proof of equivalence of the two treatments of DSA and synchrotron losses applies for an initial distribution . ...

... I normally begin by asking the class what they think would be different if the Moon didn't exist, or if the Sun were closer to Earth, or if a star exploded nearby. ... The winds would be much stronger. ... In using what-if questions in the classroom, it is worth bearing in mind that students extrapolating the effects of new scenarios will encounter two different situations: direct changes to the new version of Earth and indirect changes resulting from the direct changes. ...

... We have been upgrading the software front-end to WASP (Wideband Autocorrelating SPectrometer, operating from 800 to 4000 MHz) from Lynx-OS to Real-Time Linux and will discuss Real-Time software aspects. We are using a standard parallel ``PIO'' card to receive data from the spectrometer and standard GPIB interfaces that drive a frequency synthesizer for bandpass calibration. WASP and its front-end computer are fully mobile and can be taken to any suitable radio telescope. ...

which serves as the electronic discussion forum for this class. ... All assignments will be posted there as well. ... Since the course material is always available, there is no longer a need for students to incessantly take notes in class. ... Grading techniques, however, will be designed so that people with weak math backgrounds or aptitudes will not be penalized. ... 2 Midterms which will total 40% of your grade . ... a few homework assignments which will total 20% of your grade . ...

Astronotes Armagh Planetarium's Stellar Blog! ... Space Flight . ... September . ... Posted on September 27