XEphem Forum Message . Forums: . ... Post . ... Re: Re: Re: Xephem Catalogs . ... I'm wondering if the discrepancy with the Hipparcos catalog positions is related to precession correction not being applied to the Hipparcos objects? ... www.astronomy.net . ... Unless otherwise specified, web site content Copyright 1994-2016 John Huggins All Rights Reserved . Forum posts are Copyright their authors as specified in the heading above the post. "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...

... Paper by Bessell on Hipparcos and Tycho Passbands . ... Paper by Sung and Bessell on 40inch CCD UBVRI extinction and standard transformations. ... Paper by Bessell on Standard Systems for Encylopedia of Astronomy and Astrophysics . ... Corrected fluxes for Hamuy et al. standard stars. ... Contact: Prof. Michael S. Bessell Research School of Astronomy and Astrophysics Mount Stromlo Observatory Cotter Rd, ACT 2611 Australia telephone: +61 2 6125 0268, fax: +61 2 6125 0233 email: bessell@mso.anu.edu.au...

... Table of Contents -- Index -- PS reprint -- PDF reprint . ... The recently reshaped VizieR system, a unified query interface to an increasing number of catalogs (presently ), is presented. ... Besides the adoption of this new protocol, the most visible changes in this new version of VizieR are an easy access to notes, and possibilities of navigation between the tables of a catalog. ... There are presently rows in this table, i.e. an average of tables per catalog. ...

... Tonight's Sky . ... Star Atlas . ... stars . ... Sky Guide . ... Hubble pins down age of oldest known star . ... A team of astronomers using NASAт??s Hubble Space Telescope has taken an important step closer to finding the birth certificate of a star thatт??s been around for a long time. т??We have found that this is the oldest known star with a well-determined age,т?? said Howard Bond of Pennsylvania State University in University Park and the Space Telescope Science Institute in Baltimore,...

... The package includes a new ``hybrid'' symplectic integrator capable of handling close encounters, described at the conference: The Impact of Modern Dynamics in Astronomy , Namur, Belgium (Chambers 1998). ... NRC Research Associate, NASA/Ames Research Center , Moffett Field CA, USA, planetary accretion, formation of the asteroid belt and extra-solar planets. ... G.Laughlin and J.E.Chambers (2002) Astronomical Journal, , in press. ... American Astron. ... Home page of planet hunters Marcy and Butler ....

... Home Articles Observing Resources for Amateur Astronomers ? Part 1: Beginning Observers Observing Resources for Amateur Astronomers ? Part 3: Advanced Observers . ... Observing Resources for Amateur Astronomers - Part 1: Beginning Observers . Observing Resources for Amateur Astronomers - Part 2: Intermediate Observers . Observing Resources for Amateur Astronomers - Part 3: Advanced Observers . Observing Resources for Amateur Astronomers - Part 4: Magazines and Miscellany . ...

... NASA Sun Earth Connection Education Forum . ... Venus Transit 2004 . ... This was made possible by Johannes Kepler's understanding of the orbital behavior of celestial objects (his now famous three laws of planetary motion), careful inspection of Kepler's predictions by an English astronomer - Jeremiah Horrocks , the wisdom of Edmond Halley who not only discovered a comet but developed the first detailed plan for calculating the AU from transits of the sun, and a concept called "parallax"; . ...

... Located in the constellation of Cygnus the swan and one point of the summer triangle asterism, this star is located around 1550 light years away from Earth. ... The supernova occurred 10 billion light years away, at the time when the Universe was still young. ... Hi Zeeshan, Its difficult to determine which exact single star is the most farthest in the Universe, but astronomers using the Hubble and Spitz Telescopes have discovered galaxy MACS0647-JD, which they reckon is 13.3 billion light years...

... Commands . Axis . ... Set . ... For example, if you specify "All" axes, you normally only affect all axes that the TCC thinks exist at the current instrument position. ... Boresight specifies the position of the object on the instrument. ... The data is read from $TCC_DATA_DIR/axelim.dat at startup, but instrument-position-related limits are modified by the SET INSTRUMENT command. ... Object returns user-specified object position and related parameters, most of which are set via the TRACK command. ...

... Quasar PG 1012+008 . Hubble has captured quasar PG 1012+008, located 1.6 billion light-years from Earth, merging with a bright galaxy (the object just below the quasar). The two objects are 31,000 light-years apart, but the swirling wisps of dust and gas surrounding the quasar and galaxy provide strong evidence for an interaction between them. ... Object Type: . Quasar/AGN/Black Hole . ... Object: . PG 1012+008 . ...

... We have investigated the status of the EPIC thin and medium filters by performing an analysis of the optical loading in the PN offset maps to gauge variations in the optical and UV transmission of the filters. We both investigated repeated observations of single optically bright targets and performed a statistical analysis of the extent of loading versus visual magnitude at different epochs. ... DATA ANALYSIS The PN offset maps are uploaded on board at the start of each exposure. ...