Chandrayaan2

Jepp hur coolt som helst. Dröjer nu inte länge förens man kan kliva in på indisk restaurang och beställa första Chai på månen.

Uppdatering
https://www.isro.gov.in/update/03-jun-2019/challenges-of-moon-landing

The challenges of a Moon landing

Trajectory Accuracy
The distance to the Moon is approximately 3.844 lakh km. Ensuring trajectory accuracy while navigating such a large distance poses many challenges as trajectory is influenced by the non-uniform gravity of the Earth and Moon, gravitational pull of other astronomical bodies, solar radiation pressure, and the Moons true orbital motion.

Deep-space Communication
Owing to the large distance from Earth and limited on-board power, radio signals used for communication are weak with heavy background noise, which needs to be picked up by large antennas.

Trans Lunar Injection (TLI) and Lunar Capture
Chandryaan 2 will perform a series of TLI burns for raising its apogee successively to reach the vicinity of the Moon's orbit. As the Moon's location is continually changing due to orbital motion, the intersection of Chandrayaan 2 and the Moon's path has to be predicted sufficiently in advance with a high level of accuracy. As the Moon approaches the apogee of Chandrayaan 2, on-board thrusters fire precisely to reduce its velocity for lunar capture. The margin of error in these calculations and manoeuvres is very narrow.

Orbiting Around the Moon
Lunar gravity is 'lumpy' due to uneven mass distribution under its surface. This influences the orbit of the spacecraft. Also, precise knowledge of the thermal environment at orbital altitude is essential for keeping on-board electronics safe.

Soft Landing on the Moon
This is the most challenging part of the mission and is divided into 'rough braking' and 'fine braking'. Variation in local gravity has to be factored into the lunar descent trajectory. The onboard NGC and Propulsion System has to work in unison, autonomously, and automatically for a successful landing. Further, the landing site landscape features should not result in a communication shadow area.

Lunar Dust
The lunar surface is covered with craters, rocks, and dust. Firing of on-board engines close to the lunar surface results in backward flow of hot gases along with dust. Lunar dust is miniscule and is hard, barbed, and jagged. Its negative charge makes it stick to most surfaces, causing a disruption in deployment mechanisms, solar panel performance, and NGC sensor performance.

Extreme Temperatures and Vacuum
A lunar day or night lasts 14 Earth days. This results in extreme surface temperature variations. Moreover, the ambient pressure of the lunar surface is a hard vacuum. This makes the lunar surface an extremely hostile environment for lander and rover operations.

Vikram Lander

Press Meet - Briefing by Dr. K Sivan, Chairman, ISRO https://www.isro.gov.in/update/12-jun-2019/press-meet-briefing-dr-k-siva...
Dr Sivan outlined ISRO’s vision on space science and interplanetary missions. Understanding the secrets of the inner solar system is an aspiration of both national and international scientific community. Specifically talking about Chandrayaan-2, he announced “The launch of Chandrayaan-2 onboard GSLV MkIII-M1 is planned on July 15, 2019 at 02.51 Hrs from Sriharikota”. Further, he said the soft landing of the Vikram lander of Chandrayaan-2 on the Moon’s surface is likely to be on September 06, 2019. The briefing included the scientific objectives, challenges and benefits of the mission.
 

Kanske blir det av nu "July 15, 2019 at 02.51" från Sriharikota.

© ISRO


© ISRO

July 7

GSLV MkIII-M1 moved to launch pad.

July 10

Shroud final assembly completed.

Cryogenic stage (C25) On Board Elementary checks completed.

Liquid stage (L110) control system checks completed.

July 11

Launch Vehicle battery charging carried out.

Routine launch related checks in-progress.

Nu är det inte långt kvar. Tänk om det finns utomjordingar på månen?

July 15

A technical snag was observed in launch vehicle system at T-56 minute. As a measure of abundant precaution Chandrayaan-2 launch has been called off for today. Revised launch date will be announced later.



Ingen uppskjutning idag verkar det som.

Bara att vänta på ny uppskjutnings datum men kan ta dagar och veckor. Vem vet!
Stay tuned

Flight + Mission Sequence

© ISRO - Chandrayaan-2 lift-off

© ISRO - Chandrayaan-2 lift-off

© ISRO - Chandrayaan-2 lift-off

GSLV MkIII-M1, successfully launched the 3840 kg Chandrayaan-2 spacecraft into an earth orbit today (July 22, 2019). The spacecraft is now revolving round the earth with a perigee (nearest point to Earth) of 169.7 km and an apogee (farthest point to Earth) of 45,475 km.

After a smooth countdown lasting 20 hours, GSLV MkIII-M1 vehicle majestically lifted off from the Second Launch Pad at the Satish Dhawan Space Centre SHAR (SDSC SHAR), Sriharikota at the scheduled launch time of 1443Hrs (2:43 pm) Indian Standard Time (IST) with the ignition of its two S200 solid strap-on motors. All the subsequent flight events occurred as scheduled.

About 16 minutes 14 seconds after lift-off, the vehicle injected Chandrayaan-2 spacecraft into an elliptical earth orbit. Immediately after spacecraft separation from the vehicle, the solar array of the spacecraft automatically got deployed and ISRO Telemetry, Tracking and Command Network (ISTRAC), Bengaluru successfully took control of the spacecraft.

Today is the beginning of the historical journey of India towards Moon and to land at a place near south pole to carry out scientific experiments to explore the unexplored. In the coming days, a series of orbit manoeuvres will be carried out using Chandrayaan-2’s onboard propulsion system. This will raise the spacecraft orbit in steps and then place it in the Lunar Transfer Trajectory to enable the spacecraft to travel to the vicinity of the Moon.

Grattis ISRO och indien för lyckad uppskjutning. Chandrayaan-2 kommer nu snurra runt jorden först ett par varv och sedan ett par varv runt månen för minska hastigheten och därefter landning. Om 48 dagar. Bara nu att vänta på landning, kollade uppskjutning live på nätet och landning får man förhoppningsvis se live på nån indisk TV.

Uppskjutning med onboard kameror(den andra kanske med lite bättre kvalité). S200 separation, PLF separation, Chandrayaan-2 separation. Den 640-ton GSLV MkIII-M1 + 4-ton Chandrayaan last lyfts som en fjäder.

July 24
First earth bound orbit raising maneuver for Chandryaan-2 spacecraft has been performed successfully today (July 24, 2019) at 1452 hrs (IST) as planned, using the onboard propulsion system for a firing duration of 48 seconds. The new orbit will be 230 X 45163 km. The second orbit raising maneuver is scheduled on July 26, 2019, at 0109 hrs (IST).