... Modulating Cepheid radial velocity curves - a systematic uncertainty for Baade-Wesselink distances . ... In the current era of "precision cosmology'', measuring the Hubble constant (H0) more accurately and precisely helps to better constrain the properties of dark energy. ... Finally, the distance to the megamaser galaxy NGC 4258, which is well beyond the Local Group, has been measured to 3% accuracy, providing strong constraints on the extragalactic distance scale (via Cepheids) and for Ho. ...

... Measurements made of shadows can trace the path of the sun during the day. ... This chapter looks first at the phenomenon of shadows (how they are made), then uses measurements of shadows to track the motion of the sun across the sky. ... Topic 1: Light and Shadow . ... Try putting a pebble on the ground and asking the students to try to make a circle around it with the shadow of their fingers. ... One way to record the Sun's path is to track the shadow cast by a stationary stick. ...

... Tonight's Sky . ... Observing . ... Supernova showered Earth with radioactive debris . ... The double star 54 Leonis, spiral galaxy NGC 3198, and emission nebula NGC 3199 . ... Asymmetric ashes . ... A stronomers are reporting remarkable new findings that shed light on a decade-long debate about one kind of supernova, the explosion that marks a star's final demise: does the star die in a slow burn or with a fast bang? ... Only registered members of Astronomy.com are allowed to comment on this...

... Home Articles Comet Hyakutake: The Great ?Earthgrazing? Comet of 1996 . ... Beyond New York City . ... Observing Resources for Amateur Astronomers - Part 1: Beginning Observers . Observing Resources for Amateur Astronomers - Part 2: Intermediate Observers . ... Comet Hyakutake: The Great "Earthgrazing" Comet of 1996 . A History of the First Forty Years of the Amateur Astronomers Association . ... 2016 Amateur Astronomers Association of New York Designed by Press Customizr Powered by . ...

... The Arcetri Astrophysical Observatory (OAA) , part of the National Institute of Astrophysics (INAF) , has a long tradition of solar physics studies, initiated more than a century ago. Nowadays, these continue with a number of researchers involved in solar and plasma physics issues, divided between the Observatory and the Astronomy and Space Sciences Department of the University of Firenze . ... This email address is being protected from spambots. You need JavaScript enabled to view it. ...

Star Name . ... Crux) . ... Canis Major) . ... Centaurus) . ... Ursa Major) . ... Ursa Minor) . ... Orion) . ... Carina) . ... Canis Minor) . ...

... and prior, see paper files. return to top . ... ORDOC 01-02) D. Strom, J Brau, "Oregon RPC Status Report," , The Second IFR Workshop, January, 2001. ... ORDOC 01-07) E. Torrence , "W Boson Properties" , ( talk transparencies, XXI Physics in Collision Conference 2001, June, 2001). ... ORDOC 01-14) E. Torrence, "Precision Energy Measurements for Linear Colliders" ,Snowmass 2001, June/July, 2001 (Talk transparencies) . ... ORDOC 01-26) R. Frey, "Calorimeter Status and Next Steps" , LCD Talk, Sept., ...

Revolution: 1503 . POS_1503_080222_170_00_0002.XMM . ... 2008-02-22 | ... PSF version: 1503_04 . ... Slew: 3235 secs . ... Obs_dur: 33000 secs . ... 004: 31986 sec . ... 005: 31981 sec . ... 400: 288 sec . ... 001: 31847 sec . ... 002: 31852 sec . ... Image Fast . 006: 2737 sec . ... 003: 30526 sec . ... 401: 2801 sec . ... 402: 2801 sec . ... 403: 2801 sec . ... 404: 2801 sec . ... 007: 3097 sec . ... 405: 4961 sec . ... 406: 3161 sec . ... 407: 3161 sec . ... 408: 3161 sec . ... Image . ...

... Previous: Object-Oriented Experiences with GBT Monitor and Control . ... An overview of the Australia Telescope National Facility (ATNF) Parkes Multibeam Software is presented. ... The major software component is realtime, and uses advanced inter-process communication coupled to a graphical user interface, provided by AIPS++, to apply bandpass removal, flux calibration, velocity frame conversion and spectral smoothing to 26 spectra of 1024 channels each, every five seconds. ...

User catalogs allow you enter positions for your objects into a file, to save time during an observing run. ... Before diving into the details, here is an example: # default coordinate system and object # (these are the standard defaults, so if you like them you can omit this line) CSys=FK5; Date =2000; RotType= Object ; RotAng=0 # some random objects # Name Pos1 (e.g. RA) Pos2 (e.g. Dec) Options in keyword-value format NGC6543 rot 90 ... Object Data . Defaults . Catalog Options . ...

NASA HEADQUARTERS NACA ORAL HISTORY PROJECT ORAL HISTORY TRANSCRIPT ALAN B. KEHLET NTERVIEWED BY JENNIFER ROSS-NAZZAL SAN JOSE, CALIFORNIA ­ 30 SEPTEMBER 2005 I ROSS-NAZZ : Today is September 30th, 2005. This oral history session is being conducted AL with Alan Kehlet of NACA [National Advisory Committee for Aeronautics], Langley [Research Center, Hampton, Virginia], and STG [Space Task Group] as part of the NACA Oral History Project sponsored by the NASA [National Aeronautics and Space Administration]

... The mount is also adjustable so you can orient the axis of rotation to make it parallel with the Earth's axis of rotation (see the section on Polar Alignment). ... Locate the opening in the equatorial mount on the DEC axis. ... To mount the telescope tube: 1. ... ADJUSTING THE MOUNT FOR POLAR ALIGNMENT In order for the clock drive to track accurately, the telescope's axis of rotation must be parallel to the Earth's axis of rotation, a process known as polar alignment. ... R.A. & DEC axis ! ...

... Liyong Liu (NAOC) . Site testing on seeing conditions of the astronomical observatories over China are briefly reviewed, including Xionglong station of NAOC, Gaomeigu station of Yunnan Observatory, Delingha station of Purple Mountain Observatory. ... PDF [3.0€аMB] October 8, 09:55 10:20 . ... In this paper, we will review the site survey activities in the past years, and present the site-testing results on the Oma site, including cloud cover, seeing, water vapor, transparency and sky brightness. ...