... With enough velocity, a spacecraft can break loose from the Earth's gravity and enter an orbit around the Sun, like that of a planet. If it then orbits the Sun with the same period as the Earth--one year--it may keep a fixed position relative to Earth. ... If the distance is just right--about 4 times the distance to the Moon or 1/100 the distance to the Sun--the spacecraft, too, will need just one year to go around the Sun, and will keep its position between the Sun and the Earth. ...

... Chapter 2: Special Trouble or Action Header Keywords . ... Future enhancements will increase the special keyword reporting. Target acquisition failure) . ... All observations following the failure and preceding the next baseline guide star acquisition will contain this keyword. ... Only possible value is T. (Guide star acquisition failure) . ... Each observation until the next baseline guide star acquisition will have this keyword appended to the header file. ...

... With enough velocity, a spacecraft can break loose from the Earth's gravity and enter an orbit around the Sun, like that of a planet. If it then orbits the Sun with the same period as the Earth--one year--it may keep a fixed position relative to Earth. ... If the distance is just right--about 4 times the distance to the Moon or 1/100 the distance to the Sun--the spacecraft, too, will need just one year to go around the Sun, and will keep its position between the Sun and the Earth. ...

... Current APO Weather . ... Search Site . ... Information for New Users . ... Technical Staff pages . Night Logs and Mailing Lists (maintained by APO) . ... Technical Documents and Database Search . ... Observer's Documentation and Procedures . ... Problem Reporting and APO Technical Documents Database Search . ... APO Drawing/Document Management Procedures . ... APO Technical Documents Database Search . Home Astrophysical Research Consortium . ... Mail Lists (maintained by APO) . ...

. FOR <loop control> <statement>... [ XFOR <statement>... ] CFOR The rules for writing < loop control > are identical to those for the FORTRAN DO-loop. The actions follow the FORTRAN DO-loop control actions. At any point in the FOR-loop an XFOR statement may be inserted. This statement transfers control to the statement following CFOR. FOR I=1,80 LINE(I)=' ' CFOR .

... They are concerned with Attitude Control System of the spacecraft, satellite visibility from tracking stations, limits on the satellite autonomous operations during the orbit, and needs for auxiliary operations with the spacecraft. ... Among the operational constraints the most important one is the number of programmed slews per orbit, which determines the maximum number of radio sources to be observed during one orbit. ... System temperature (K) . ... Progress of the RadioAstron Project in Pictures...

... xmmtrack . ... xmmtrack is an interactive IDL application that visualizes the orbit and attitude data in an ODF in the form of a 3-D animation sequence. The presented scenery includes an astronomically accurate simulation of the Earth-Sun system plus the actual and predicted trajectory of the XMM satellite on its path around the Earth. ... Please note: XMM's orbit is highly time variable and the predicted orbit will significantly deviate from the actual trajectory if the reference epochs differ. ...

Follow-up astrometry and recoveries are made with the ANU 40 inch (1.0-m) f/8 reflector at Siding Spring Observatory (IAU code 413). ... A routine follow-up of 2003 WY153 on 2003 Dec 15 became much more than routine when a faint object with unusual motion vector was found close to the target asteroid. ... During routine astrometry with the 1.0-m to improve the orbit of the Apollo asteroid 2004 CB, the asteroid was found on March 30 to have a short tail! ... Siding Spring Survey Main Page . ...

130705 ephemeris tracking . The pnt command has been added to the aotcl interpreter in vxWorks (used for online datataking). within the online tcl interpreter pnt ? ... Load ephemeris file with pnt ephm ld . Track the ephemeris file . Ephemeris tracking was added to the pnt command on 05jul13. ... The new command includes loading an ephemeris file and then tracking using this file. ... The user then starts the ephemeris tracking by issuing the pnt track command: . ... cR current ra,dec . ...

October 14, 2010 =============== Address BUGS In bisque/mks: add Home on startup -- currently must be homed with the joystick reverse tracking direction in southern hemisphere check southern hemisphere mappings In order of priority -- Make a guide and manual available. Provide a method of determining best pointing correction parameters. ... Fully test pointing corrections on a system capable of arc second accuracy. ...

... Ballistics, navigation and flight control of the spacecraft, going to the L2 point of Sun-Earth system. ... and calculation algorithms have been developed: - an algorithm, building nominal trajectories for one impulse flights to the L2 point of Sun- Earth system, including a Moon swingby maneuver or not. - an algorithm, calculating corrections of spacecraft trajectory needed for the flight from Earth to halo orbit and for stationkeeping of the spacecraft moving in halo ...

... This section discusses the A tag which is used to define anchors (places in a document that can be linked to) and also to create links. ... An anchor identifies a place in an HTML document. ... HREF=" location " . ... HREF="documents/nextdoc.html" To scroll the current document to an anchor, give the name of the anchor preceded by the pound (#) sign. ... HREF="#anchor1" To open a different document at an anchor, give the URL for the document, followed by the # sign followed by the name of the anchor...