... Tonight's Sky . ... Astronomy for Kids . ... CERN experiment makes spectroscopic measurement of antihydrogen . ... The ALPHA collaboration at CERN reports an important milestone on the way to measuring the properties of antimatter atoms. ... This measurement shows that it is possible to set up experiments in which the internal properties of antihydrogen atoms can be changed by shining microwaves on them. ... Only registered members of Astronomy.com are allowed to comment on this article. ...

Next: ACKNOWLEDGMENTS Up: EXTREME HELIUM STARS: PULSATION Previous: DIRECT MASSES FOR BXCIR . The highly-processed surfaces of extreme helium stars point to an extremely unusual evolutionary history. ... The result demonstrates that pulsations are an essential and successful tool for determining the evolutionary origin of extreme helium stars. Direct masses for two agree well with the spectroscopic and pulsation masses, although much may be done to reduce the errors. ...

Infrared Detector Array Links . ... Control Software Links . Optics Links . Micro-Optics Links . ... Optical Materials Databases . ... Atmospheric Database Links . Linux Links . ... Rockwell Science Center home page. ... Santa Barbara Research Center home page. ... CCD-World home page. ... SDSU home page. ... EPICS home page. ... Optics Society of America . ... Linux on Laptops ( local site and US home page ). ... Instrumentation Links * Gemini Project Links * Other IR Instruments ...

Optical and UV Spectrophotometric Standard Stars . ... Apache Point expresses its thanks to J. R. Walsh and to ESO for allowing us to place a copy of these pages at Apache Point. ... Access to the standards is either through: . ... The data for the standard stars come from four sources: . ... Data for 23 stars based on IUE and optical spectra and calibrated by the primary WD standards. ... The data from which the plots were produced are also available by ftp access from the standard star pages. ...

Next: HKPARMINT Up: Generation from In-Orbit Data Previous: Wavelength calibration Contents . Spectroscopic Standard stars, mainly white dwarfs, were observed with both OM grisms. The ISF is obtained by dividing the extracted spectrum, in count rate versus wavelength, by the standard flux of the star obtained from HST Calspec database. The results obtained from several stars are then averaged and the standard deviation is taken as the error in the ISF. ...

... Publications . ... Spilker, J. S., Marrone, D. P., Aguirre, J. E., Aravena, M.; Ashby, M. L. N.; BУ?thermin, M.; Bradford, C. M.;Тљ Bothwell, M. S. , Тљ(and 23 additional authors) -Тљ The Rest-frame Submillimeter Spectrum of High-redshift, Dusty, Star-forming Galaxies Тљ- 2014, ApJ, 785, 149 . ... Horiuchi, S., Beacom, J.,Тљ Bothwell, M. S. , Thompson, T -Тљ Effects of stellar rotation on star formation rates and compaison to core collapse supernova rates Тљ- 2013, ApJ, 769, 113 . ...

Astronotes Armagh Planetarium's Stellar Blog! ... Our Galaxy . ... Stars . ... Space Flight . ... New observations with the European Southern Observatory (ESO)тАЩs Very Large Telescope of some of the most distant galaxies ever detected are revealing the mysteries of this important phase of the early Universe. ... These powerful instruments are essential for exploring this early period in cosmic history as they alone can enable the accurate observations of €аthese extremely distant and faint galaxies. ...

... Home Education Classes AAA Winter Astronomy Class: Measuring Distances in Space тАУ Dec 2015 тАУ Feb 2016 . ... Classes . AAA Fall Astronomy Class: Astronomy Basics тАУ October-November 2015 . AAA Winter Astronomy Class: Measuring Distances in Space тАУ Dec 2015 тАУ Feb 2016 . AAA Spring Astronomy Class: The Physics of Astronomy тАУ February - March 2016 . ... This MonthтАЩs Sky тАУ April 2016 . ... Dec. ... Observing Resources for Amateur Astronomers - Part 1: Beginning Observers . ...

... ARTICLE: The Adventurous Search For The Astronomical Unit . ... Kepler himself had suggested to use the rare occasions of Venus transiting (crossing) the solar disk to measure our distance to the planet. ... Due to the orbital inclination of Venus against the ecliptic of 3.5°, a Venus transit is so rare that it happens only at intervals of 121.5 years, 8 years, 105.5 years, 8 years and so on. ... Crabtree witnessing the transit of Venus 1639 . ... Transits of Venus - The Quest for the Solar Parallax...

Dynamic Shack-Hartmann System RAPID V. G. Orlov, V. V. Voitsekhovich Instituto de AstronomМa, UNAM, MИxico CONACYT project E9507-1020P UNAM PAPIIT IN104910 Telescopes OAN OAN- SPM 2.1m telescope 1.5m telescope 0.84m telescope 2.1m telescope OAN-Tonanzintla 1m telescope Astronomical site SPM Observing statistics 1982-2002 (Tapia+ 2007 ) Photometric nights : 64.1% Spectroscopic ... Rapid - Dynamic Shack-Hartmann All modern telescopes demand installation of adaptive system. ...

... Boston: Houghton Mifflin Company, 1999, ISBN: 0 395 93888 0 $25 . ... This book clarifies the fundamental principles of the field as well as the important astronomical phenomena it describes. ... Basic Books, 2001, ISBN: 0-465-05755-1, $40 . ... Prometheus Books, 2004, ISBN: 1-59102-186-3, $28 . ... Astronomical. ... Book. ... This book is filling a gap in the astronomy-related literature by providing a set of chapters not only of direct interest to astronomy communication, but also well beyond it. ...

... Observatory . ... THE HISTORY OF AAAP . ... After introductory remarks by Robert Sanders, founder of the Association, it was moved that the name of the organization be Amateur Astronomers Association of Princeton. ... 2/72 First issue of Sidereal Times, so named by Editor Roxanne Tobin. ... 5/72 Election of officers: Norman Sperling, Director; John Church, Assist. ... Sidereal Times, John gives the following report: . ... Sidereal Times.) ... Amateur Astronomers Association of Princeton Т? 2015. ...