#launch window

"Artemis II launch opportunities in early 2026.

NASA is planning on rolling out the Artemis II rocket and spacecraft from the Vehicle Assembly Building to Launch Pad 39B at NASA's Kennedy Space Center no earlier than 17 January. The 6.4 km journey will take up to 12 hours.

At the end of January, NASA will conduct a wet dress rehearsal - a prelaunch test to fuel the rocket. Following a successful wet dress rehearsal, the mission management team will assess the readiness of all systems before committing to a launch date."

"Confirmed, we have to scrub." "Ugh, okay. I'll get the bucket and sponge."

An animation showing 4 years of the likely orbit of the Tesla Roadster to be launched by SpaceX to interplanetary space on Falcon Heavy's maiden flight on Feb 6th, 2018. 

 Blue: Earth 

Orange: Mars 

Red: Roadster 

 Axes are in AU Gray cross is the Sun 

 While the exact details of the orbit are not known, it is thought that the Roadster will be injected into a Mars transfer trajectory (a classical Hohmann transfer between the Earth and Mars). This video is an educated guess of what the orbit might look like. 

NASA’s new Artemis 1 launch schedule reveals it can attempt 3 launches per week

NASA’s aiming for the moon again. But weeks must pass before the Artemis 1 rocket and spacecraft return to the launch pad, while additional work is performed. However, NASA just released the entire docket for launch windows available to the newest lunar transport vehicle, and it extends until mid-2023. Crucially, the Artemis 1 rocket—which requires refueling for every launch attempt—can only…

झेपावे मंगळाकडे…

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>> जयकृष्ण पुरूषोत्तम पुराणिक

करोनाच्या जागतिक समस्येमुळे यंदाच्या मंगळ मोहिमांकडे जवळपास सर्वांचेचे दुर्लक्ष झाले आहे. तथापि, यूएई, चीन व अमेरिका यांनी अथक प्रयत्नांती सारी तयारी पूर्ण केली असून त्याचा शुभारंभ येत्या १४ जुलै रोजी होत आहे. पाठोपाठ २० ते २५ जुलैच्या दरम्यान चीनच्या उपग्रहाचे तर ३० जुलैच्याजवळपास नासाचेही प्रक्षेपण आहे. या तीनही मोहिमा स्वतंत्र असल्या तरी त्यांची काही…

Earth and Mars orbit the Sun at different speeds, so they only line up once every 26 months or so, a phenomenon called Opposition.  Opposition doesn’t occur at the same place in their orbits each time, instead shifting forward at every cycle.  Probes being sent from Earth to Mars can only launch in a short window that opens a few months before Opposition.  Because the orbits of Earth and Mars are eccentric (meaning they are not perfect circles), at some points the Opposition between them is closer, and some points it is farther.

There is a 15 to 17 year cycle dictating the closest and farthest Oppositions, which I have noted below (when I say “closest” and “farthest,” I mean they are at a relative local minimum and local maximum respectively; every launch window opens in the months leading up to the absolute minimum distance between the two planets, the distance just varies on a cycle.  The planets are truly farthest apart roughly one year before Opposition, and this point also fluctuates closer and farther on the same cycle)

April 2001 (Mars Odyssey, April 7)

June/July 2003, PLANETS CLOSEST (Mars Express/Beagle 2, June 2; Spirit, June 10; Opportunity, July 8)

August 2005 (Mars Reconnaissance Orbit, August 12)

August 2007 (Phoenix, August 4)

October 2009 (no missions launched this window)

November 2011, PLANETS FARTHEST (Fobos-Grunt/Yinghuo, November 8; Curiosity, November 26)

November 2013 (Mars Orbiter Mission, November 5; MAVEN, November 18)

March 2016 (ExoMars Trace Gas Orbiter/Schiaparelli EDM lander, March 14)

May 2018, PLANETS CLOSEST (InSight/MarCO, May 5)

July/August 2020 (Upcoming: Mars 2020, July 17 - August 5; HX-1, July 23 - August 5; Rosalind Franklin, July 25; Hope Mars Mission, July)

August/September 2022

October 2024

November 2026, PLANETS FARTHEST

November/December 2028

February 2031

April/May 2033

July 2035, PLANETS CLOSEST

August 2037

September/October 2039

October/November 2041, PLANETS FARTHEST

November 2043

December 2045/January 2046

March 2048

May/June 2050, PLANETS CLOSEST

July/August 2052

August 2054

October 2056

November 2058, PLANETS FARTHEST

November/December 2060

January/February 2063

April/May 2065

July 2067, PLANETS CLOSEST

August 2069

September/October 2071

November 2073, PLANETS FARTHEST

November/December 2075

December 2077/January 2078

March/April 2080

June/July 2082, PLANETS CLOSEST

August 2084

October 2086

October/November 2088

November 2090, PLANETS FARTHEST

November/December 2092

March 2095

May 2097, PLANETS CLOSEST