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Topic: Launch window

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Hohmann transfer orbit

	Launch window - Wikipedia, the free encyclopedia
		Launch window is a term used in aerospace to describe a time period in which a particular rocket must be launched.
		If the rocket does not launch in the "window", it has to wait for the next one before it can be launched.
		To go to another planet without using any kind of gravitational slingshot, if eccentricity of orbits is not a factor, launch windows are periodic according to the synodic period; for example, in the case of Mars the period is 2.135 years, i.e.
	en.wikipedia.org /wiki/Launch_window (211 words)

	NASA Quest > Space Team Online (Site not responding. Last check: 2007-08-12)
		Typically, the biggest factor in determining the beginning and end of a launch window is a payload.
		Windows can also be determined by conditions not only here at the launch site but also those halfway around the world.
		Launching exactly halfway in the 10-minute time frame would require the least amount of propellant in space to rendezvous with the target.
	quest.arc.nasa.gov /people/journals/space/ciannilli/01-07-99.html (1068 words)

	Launch Mass and Launch Window
		The launch mass and the propellant on the spacecraft were allocated for the worst case over the two weeks launch window.
		Launch masses for the range of hyperbolic escape velocities and asymptote declinations, as required for a Mars transfer in the 2003 window, based on this input, are shown in Figure 6.1.
		For cases in the middle of the daily window at the opening and closing of this seasonal launch window, the trajectory has been verified and re-optimised using numerical integration and a sophisticated dynamical model.
	helio.estec.esa.nl /intermarsnet/REDREPORT/node105.html (657 words)

	ESA - Space Science - Home - What is a 'launch window'?
		The launch window is a term used to describe a time period in which a particular mission must be launched.
		If the weather is bad or a malfunction occurs during a launch window, the mission must be postponed until the next launch window appropriate for the flight.
		Calculating the launch window for the ESA Mars Express mission involved timing the launch to allow the spacecraft and Mars to arrive at the same point in space at the same time.
	www.esa.int /esaSC/SEMO49YO4HD_index_0.html (436 words)

	Launch Window (Site not responding. Last check: 2007-08-12)
		A launch window is the time or set of times during a given day that the Space Shuttle can launch and still meet mission objectives and stay within safety guidelines.
		This window opening is valid at the nominal mission altitude (superscript 1).
		In the event of a launch delay of days or more, this bar slides to the right to whatever new launch date is projected.
	liftoff.msfc.nasa.gov /academy/rocket_sci/launch/launch_window.html (375 words)

	Launch window: Facts and details from Encyclopedia Topic (Site not responding. Last check: 2007-08-12)
		Launch window is a term used in aerospace aerospace quick summary:
		A rocket is a vehicle, missile or aircraft which obtains thrust by the reaction to the ejection of fast moving exhaust gas from within a rocket...
		(launch windows are periodic according to the synodic period Orbital period quick summary:
	www.absoluteastronomy.com /encyclopedia/l/la/launch_window.htm (859 words)

	Window (disambiguation) - Wikipedia, the free encyclopedia
		Window function, in signal processing, a function that is zero-valued outside of some chosen interval
		Launch window, in aerospace, a time period in which a particular rocket must be launched
		Window period, in medicine, the time between first infection and when a test can detect that infection
	en.wikipedia.org /wiki/Window_(disambiguation) (207 words)

	JSC Features - Setting the date: Teams work to select Shuttle launch windows (Site not responding. Last check: 2007-08-12)
		It is their job to ensure that a launch window has the right combination of factors such as orbits, inclinations, planetary rotation and sunlight.
		One of the group’s roles is to examine weather and climatology for launches and landings.
		It is possible that the LCC guidelines indicate a “go” for launch while the abort landing flight rules say “no go,” and vice versa, but the decision to launch lies with the flight director, launch director and ultimately with Deputy Shuttle Program Manager Wayne Hale, who chairs the Mission Management Team.
	www1.jsc.nasa.gov /jscfeatures/articles/000000395.html (925 words)

	L1 Launch Windows
		L1 launch windows were determined by the need to have the disk of the earth fully illuminated for the L1's 'planetary sensor'.
		There has been some discussion on the constraints for launch windows of the Soviet L1 manned circumlunar spacecraft (note for example the articles by Grahn, and the discussion in the article of Vick and Pesavento cited in the bibliography).
		Both Grahn and a declassified 1967 CIA analysis show that the L1 could not be launched for the first six months of each year from 1967-1972 due to launch window constraints related to the declination phase of the moon.
	www.astronautix.com /articles/l1lndows.htm (1243 words)

	Lloyd's satellite constellations - Overview - Iridium
		The launch of five satellites on 11 February 2002 was delayed due to strong winds.
		The tenth launch was scheduled to be five satellites on a Boeing Delta II from Vandenberg on 31 January.
		The launch was delayed until at least the 19th of January, as cork thermal protection was was found to have debonded in places on the first stage and needed to be repaired.
	www.ee.surrey.ac.uk /Personal/L.Wood/constellations/iridium.html (2486 words)

	NPR : Launch Windows: How NASA Decides When to Fly
		The perfect launch window requires the coincidence of orbits and their inclinations, precession, weather and lighting.
		The July 13 launch was postponed due to a malfunctioning fuel tank sensor, a problem that can't be solved quickly.
		If NASA fails to launch Discovery by the end of July, the launch window will slip into the dimly lit hours, and Discovery will have to wait until September for its return to flight.
	www.npr.org /templates/story/story.php?storyId=4749663 (856 words)

	Fred says: When to Launch (Site not responding. Last check: 2007-08-12)
		Each round is allocated a launch window which, depending on the size of the contest, typically varies from 30 minutes to more than one hour.
		If you launch at an inopportune time, in a worst case scenario, you may be forced to extend your search pattern, and if unable to find lift, won't even be able to make it back to the field to collect your flight points.
		The winner of the toss has the option of launching whenever he prefers within the round, but if he hasn't found air to his liking by 0930, the loser is required to launch.
	www.torreypinesgulls.org /Launch.htm (7137 words)

	Info on launch window (Site not responding. Last check: 2007-08-12)
		In fact, the antenna pointing angles (at separation) for launch times after 6:35 GMT are bad enough that the Ascension Island tracking station may not be able to receive the data.
		The bigger the launch window, the more flexibility one has to changing weather conditions or assessing countdown issues.
		A two hour window is normal for Atlas launches and should be sufficient to give one the time to get the satellite on its way.
	www-astro.physics.ox.ac.uk /~erik/sax/sax_lw.html (256 words)

	Space Exploration Technologies Corporation
		SpaceX is developing a family of launch vehicles intended to substantially reduce the cost of reliable access to space.
		Our first launch vehicle, named Falcon, is a two stage, liquid oxygen and kerosene powered rocket capable of placing half a ton into low Earth orbit.
		While drawing upon the ideas of many prior launch vehicle programs from Apollo to the X-34/Fastrac, SpaceX is privately developing the entire Falcon rocket from the ground up, including both engines, the turbo-pump, the cryogenic tank structure and the guidance system.
	www.spacex.com /?section=media&content=http://www.spacex.com/launch_info.php (235 words)

	Launch Window (Site not responding. Last check: 2007-08-12)
		NASA's decision to launch Surveyor on 7 November 1996 was not an arbitrary choice, nor was it based on when management thought the spacecraft would be ready for flight.
		The tricky part involved timing the launch to allow Surveyor and Mars to arrive at the same point in space at the same time.
		Engineers on the flight team refer to the dates when Mars and Earth are aligned in the right position for launch as the "launch window" or "launch period." Surveyor's launch period opened on 6 November 1996 and closed on 25 November 1996.
	mars.sgi.com /mgs/overvu/delta/window/window.html (175 words)

	Vandenberg AFB Launch Schedule
		With the exception of Minuteman III launches, launch dates are fluid and tend to change over time.
		Launches for all vehicles except the Pegasus XL are scheduled for the start of the launch window.
		Pegasus XL launch times are scheduled for the middle of the launch window.
	www.spacearchive.info /vafbsked.htm (509 words)

	What's a launch window? By Daniel Engber
		Last Friday, NASA postponed the launch of the space shuttle Discovery due to an equipment malfunction.
		Discovery's "launch window" ends on July 31; if that deadline expires, there can't be another countdown until sometime in September.
		As the launch date approaches the end of July, the 10-minute window moves closer to sunrise.
	www.slate.com /id/2122936?nav=ais (600 words)

	SM3B Discussion Board
		The correct time for the launch window is 6:22 am with a 62 minute window.
		I assumed that the window for a HST rendevous would be as small, if not smaller due to the much higher altitude of the HST.
		Most launches today are to Station, and as Dave mentions its inclination is higher, so that shuttle has to head NE from the pad.
	sm3b.gsfc.nasa.gov /discus/messages/1/47.html (517 words)

	Shenzhou-5 Launcher Ready For Transfer To Jiuquan Launch Site
		According to sources at the Chinese Academy of Launch Vehicle Technology (CALT), which is the manufacturer of CZ-2F in Beijing, a team of technicians would accompany the shipment of the launcher to the Jiuquan Satellite Launch Centre (JSLC) in the northwestern Gansu Province.
		One of the main reasons for a day launch of SZ-5, according to the space officials, is that the warmer daytime temperature would improve the working conditions for ground personnel and thereby "further adequately guarantee the safety of the yuhangyuan ('astronaut')".
		However, the latest news of a launch in the pre-sunrise part of the day seems to negate the idea of working in a warmer environment for the final hours of the launch countdown.
	www.spacedaily.com /news/china-03u.html (1420 words)

	STS-111
		EST, the planned 19:44:26 EDT launch attempt for 5/30/02 was scrubbed due to weather concerns with a 24 hour launch scrub turn-around and a new T-0 set for 7:22p.m.
		The launch window will be updated to coincide with the latest orbital position of the Space Station and will be announced at the T-9 minute hold.
		Launch countdown preparations are beginning, with the countdown scheduled to pick up early next week.
	science.ksc.nasa.gov /shuttle/missions/sts-111/mission-sts-111.html (876 words)

	Phoenix (spacecraft) Encyclopedia @ LaunchBase.com (Launch Base) (Site not responding. Last check: 2007-08-12)
		In August 2003 NASA selected the University of Arizona "Phoenix" mission for launch in 2007 as what is hoped will be the first in a new line of smaller, low-cost, "Scout" missions in the agency's exploration of Mars program
		The spacecraft will be launched by a Boeing Delta 7925 vehicle, with the launch window starting August 3, 2007.
		It will carry improved versions of University of Arizona panoramic cameras and volatiles-analysis instrument from the ill-fated Mars Polar Lander, as well as experiments that had been built for the Mars Surveyor 2001 Lander, including a JPL trench-digging robot arm and a chemistry-microscopy instrument.
	www.launchbase.com /encyclopedia/Phoenix_(spacecraft) (1456 words)

	Mercury Shot Misses Launch Window - CBS News
		Managers stopped the launch because of clouds near the pad at a critical point in the countdown.
		Launch controllers have until Aug. 14 to launch the spacecraft.
		That includes the launch aboard an unmanned rocket in the wee hours of Aug. 2, and all the scientific analysis seven years from now.
	www.cbsnews.com /stories/2004/08/03/tech/main633598.shtml (1170 words)

	NASA again delays launch of Pluto probe - Space News - MSNBC.com (Site not responding. Last check: 2007-08-12)
		The space agency has until mid-February to launch the piano-sized spacecraft, but a launch in January would allow the spacecraft to use Jupiter’s gravity to shave five years off the 3-billion-mile (4.8-billion-kilometer) trip.
		The first launch attempt was called off Tuesday afternoon with less than three minutes left in the countdown, when winds at the launch pad in Cape Canaveral exceeded the space agency’s 38 mph (33-knot) flight restriction.
		The launch preparations drew attention from opponents of nuclear power because the spacecraft is powered by 24 pounds (11 kilograms) of plutonium, whose natural radioactive decay will generate electricity for the probe’s instruments.
	www.msnbc.msn.com /id/10878811 (833 words)

	STS-71 - Mir Rendezvous (Launch Window)
		There is only about a 5-10 minute launch window each day that can get the Shuttle in the correct position to rendezvous with the Russian Mir space station.
		If you launch a couple of minutes early or late or if Mir doesn't go directly over the launch site you can still get to the right plane, it will just mean you have to steer your way there.
		Once the Space Shuttle launches into the same orbital plane as Mir it still has the complicated task of getting to the same spot in space at the same time as Mir.
	liftoff.msfc.nasa.gov /academy/rocket_sci/launch/mir_window.html (729 words)

	John F. Kennedy Space Center - Space Shuttle Launch Schedule (Site not responding. Last check: 2007-08-12)
		Target launch and landing dates are based on Kennedy Space Center assessments.
		Note: Official launch dates are set at the Flight Readiness Review, held approximately two weeks prior to the targeted liftoff date.
		However, launch dates and times are subject to change up to the time of launch due to weather, technical issues or other reasons.
	www-pao.ksc.nasa.gov /kscpao/schedule (222 words)

	Launch Window Announced
		The primary launch window extends from June 26 to July 15, 2005, and if necessary, there is also a backup launch window from July 22 to August 2, 2005.
		JAXA aims to launch Astro-E2 as early as possible during the first period.
		The launch window during each day extends from 11 am to 1pm Japan Standard Time.
	heasarc.gsfc.nasa.gov /docs/astroe/news/window.html (144 words)

	The Artemis Launch Window
		This is the first window that opens when you start Artemis.
		If the file you select is successfully read a new window will open, which shows the sequence and features for the entry.
		Currently the log window is only used on UNIX and GNU/Linux systems to show the output of external programs.
	www.ucalgary.ca /appinst/pubdoc/artemis7/launch-window.html (365 words)

	ESA Science & Technology: Launch Vehicle
		Venus Express was launched by a Soyuz-Fregat launcher from the Baikonur Cosmodrome on 9 November 2005, early in the launch window, open from 26 October until 25 November 2005.
		Soyuz was first launched in November 1963 and 1683 have been flown as of 13 October 2003.
		The Soyuz launch vehicle comprises a lower composite and upper composite.
	sci.esa.int /science-e/www/object/index.cfm?fobjectid=33954 (356 words)

	NASA - NASA Expendable Launch Vehicle Status Report: E06-002
		Launch Vehicle: Orbital Sciences Pegasus XL Launch Date: Feb.
		They will remain there until a launch date is determined and they are prepared for transporting to the launch complex.
		Further Delta II preparations at the launch pad are on hold until the CALIPSO/CloudSat payloads arrive for installation atop the second stage.
	www.nasa.gov /home/hqnews/2006/jan/HQ_E06002_ELV_status_report.html (342 words)

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