better will be to send him to moon where he can be undisputed leader of moonites. Earthlings will be too happy to do tht especially delhiites.That was Kejriwal trying to take credit over Chandrayaan in a Yoga pose
This one is his election campaign trip.
It depends on how much you pray for him to win
BBC was particularly pissed off lol that anchor ranted about poverty BS as always ,these Brits live in a delusion that they still rule their colonies , poor fellows
Just look at the comment section
700 million Indians without toilet?
No wonder these morons are now failing even to build simple OPVs
I knew this would happen. Remember the mission extension of Mars Orbiter ? ISRO always undersells their mission scope.
Chandrayaan-2 may orbit Moon for 2 years
Chethan Kumar | TNN | Updated: Jul 28, 2019, 15:08 IST
HIGHLIGHTS :
BENGALURU : The orbiter on Chandrayaan-2, which Indian Space Research Organisation (Isro) initially said would go around Moon for one year, will be able to have a lifespan of at least two years if everything goes as per Isro’s current estimations.
At least five people associated with the Rs 978-crore mission told TOI that it’s life may be extended by an additional year as per the current status of things, which is a significant bonus from the one-year lifespan that Isro chairman K Sivan had said it would have on June 12.
“Chandrayaan-1 was planned for a longer life than it had but a problem with the power converters led to a curtailed lifespan, which has been corrected for Chandrayaan-2. And, going by the amount of fuel that will remain in the orbiter after all the manoeuvres, we will have Chandrayaan-2 orbiting for at least two years,” a source working with the mission team, said.
The orbiter was packed with 1,697kg of propellant at the time of the launch, and it has already expended about 130kg of it for the two manoeuvres Isro conducted on July 24 and 26. As on Saturday (July 27), the orbiter had more than 1,500kg of propellant remaining.
A scientist said that a better-than-textbook launch has given the agency an advantage of about 40-odd-kg of fuel. Besides, another scientist said: “Even as per the initial plan we had, additional fuel was budgeted keeping in mind some emergencies. But going by present estimates and calculations, we will have more fuel than it is needed to orbit for a year.”
Sivan had earlier said that all the manoeuvres until the separation of Vikram, the lander, will be fuelled by the propellants on the orbiter. This means that there are nine more manoeuvres before the separation, during which many more kilograms of fuel will be used up.
According to Isro’s present estimation, at the end of all Earth-bound and lunar-bound manoeuvres, the orbiter should be left with at least 290.2kg of fuel when it is in the 100kmX100km orbit around Moon (see graphic).
“This will be more than enough for it to go around Moon for two years as there will be no more big manoeuvres required,” the first scientist said. Another scientist said that the only manoeuvres after reaching the desired lunar orbit, if at all, would be minor ones.
“But, given that Moon’s gravity is not uniform unlike Earth, the orbiter needs to be kept in the correct orbit, which will require periodic intervention. If left unattended, the closest point to Moon could become very narrow. These manoeuvres will use up some fuel,” the scientist explained.
All the scientists emphasised that they could only confirm the exact number of additional days the orbiter could have around Moon once the lunarcraft is settled into an orbit there. “Chandrayaan-2 is expected to be inserted into the lunar orbit on August 20, and we can assess how long it would last once it is there and we know exactly how much fuel is left,” one of them said.
Chandrayaan-2 may orbit Moon for 2 years | India News - Times of India
Chandrayaan-2 may orbit Moon for 2 years
Chethan Kumar | TNN | Updated: Jul 28, 2019, 15:08 IST
HIGHLIGHTS :
- The orbiter on Chandrayaan-2, which Isro initially said would go around the Moon for just one year, may now have a lifespan of at least two years.
- The orbiter was packed with 1,697kg of propellant at launch, and it has expended about 130kg for the two manoeuvres on July 24 and 26.
- As on Saturday, the orbiter had more than 1,500kg of propellant.
BENGALURU : The orbiter on Chandrayaan-2, which Indian Space Research Organisation (Isro) initially said would go around Moon for one year, will be able to have a lifespan of at least two years if everything goes as per Isro’s current estimations.
At least five people associated with the Rs 978-crore mission told TOI that it’s life may be extended by an additional year as per the current status of things, which is a significant bonus from the one-year lifespan that Isro chairman K Sivan had said it would have on June 12.
“Chandrayaan-1 was planned for a longer life than it had but a problem with the power converters led to a curtailed lifespan, which has been corrected for Chandrayaan-2. And, going by the amount of fuel that will remain in the orbiter after all the manoeuvres, we will have Chandrayaan-2 orbiting for at least two years,” a source working with the mission team, said.
The orbiter was packed with 1,697kg of propellant at the time of the launch, and it has already expended about 130kg of it for the two manoeuvres Isro conducted on July 24 and 26. As on Saturday (July 27), the orbiter had more than 1,500kg of propellant remaining.
A scientist said that a better-than-textbook launch has given the agency an advantage of about 40-odd-kg of fuel. Besides, another scientist said: “Even as per the initial plan we had, additional fuel was budgeted keeping in mind some emergencies. But going by present estimates and calculations, we will have more fuel than it is needed to orbit for a year.”
Sivan had earlier said that all the manoeuvres until the separation of Vikram, the lander, will be fuelled by the propellants on the orbiter. This means that there are nine more manoeuvres before the separation, during which many more kilograms of fuel will be used up.
According to Isro’s present estimation, at the end of all Earth-bound and lunar-bound manoeuvres, the orbiter should be left with at least 290.2kg of fuel when it is in the 100kmX100km orbit around Moon (see graphic).
“This will be more than enough for it to go around Moon for two years as there will be no more big manoeuvres required,” the first scientist said. Another scientist said that the only manoeuvres after reaching the desired lunar orbit, if at all, would be minor ones.
“But, given that Moon’s gravity is not uniform unlike Earth, the orbiter needs to be kept in the correct orbit, which will require periodic intervention. If left unattended, the closest point to Moon could become very narrow. These manoeuvres will use up some fuel,” the scientist explained.
All the scientists emphasised that they could only confirm the exact number of additional days the orbiter could have around Moon once the lunarcraft is settled into an orbit there. “Chandrayaan-2 is expected to be inserted into the lunar orbit on August 20, and we can assess how long it would last once it is there and we know exactly how much fuel is left,” one of them said.
Chandrayaan-2 may orbit Moon for 2 years | India News - Times of India
What are the chances that the rover and lander work beyond their 14 days plan?I knew this would happen. Remember the mission extension of Mars Orbiter ? ISRO always undersells their mission scope.
Chandrayaan-2 may orbit Moon for 2 years
Chethan Kumar | TNN | Updated: Jul 28, 2019, 15:08 IST
HIGHLIGHTS :
- The orbiter on Chandrayaan-2, which Isro initially said would go around the Moon for just one year, may now have a lifespan of at least two years.
- The orbiter was packed with 1,697kg of propellant at launch, and it has expended about 130kg for the two manoeuvres on July 24 and 26.
- As on Saturday, the orbiter had more than 1,500kg of propellant.
BENGALURU : The orbiter on Chandrayaan-2, which Indian Space Research Organisation (Isro) initially said would go around Moon for one year, will be able to have a lifespan of at least two years if everything goes as per Isro’s current estimations.
At least five people associated with the Rs 978-crore mission told TOI that it’s life may be extended by an additional year as per the current status of things, which is a significant bonus from the one-year lifespan that Isro chairman K Sivan had said it would have on June 12.
“Chandrayaan-1 was planned for a longer life than it had but a problem with the power converters led to a curtailed lifespan, which has been corrected for Chandrayaan-2. And, going by the amount of fuel that will remain in the orbiter after all the manoeuvres, we will have Chandrayaan-2 orbiting for at least two years,” a source working with the mission team, said.
The orbiter was packed with 1,697kg of propellant at the time of the launch, and it has already expended about 130kg of it for the two manoeuvres Isro conducted on July 24 and 26. As on Saturday (July 27), the orbiter had more than 1,500kg of propellant remaining.
A scientist said that a better-than-textbook launch has given the agency an advantage of about 40-odd-kg of fuel. Besides, another scientist said: “Even as per the initial plan we had, additional fuel was budgeted keeping in mind some emergencies. But going by present estimates and calculations, we will have more fuel than it is needed to orbit for a year.”
Sivan had earlier said that all the manoeuvres until the separation of Vikram, the lander, will be fuelled by the propellants on the orbiter. This means that there are nine more manoeuvres before the separation, during which many more kilograms of fuel will be used up.
According to Isro’s present estimation, at the end of all Earth-bound and lunar-bound manoeuvres, the orbiter should be left with at least 290.2kg of fuel when it is in the 100kmX100km orbit around Moon (see graphic).
“This will be more than enough for it to go around Moon for two years as there will be no more big manoeuvres required,” the first scientist said. Another scientist said that the only manoeuvres after reaching the desired lunar orbit, if at all, would be minor ones.
“But, given that Moon’s gravity is not uniform unlike Earth, the orbiter needs to be kept in the correct orbit, which will require periodic intervention. If left unattended, the closest point to Moon could become very narrow. These manoeuvres will use up some fuel,” the scientist explained.
All the scientists emphasised that they could only confirm the exact number of additional days the orbiter could have around Moon once the lunarcraft is settled into an orbit there. “Chandrayaan-2 is expected to be inserted into the lunar orbit on August 20, and we can assess how long it would last once it is there and we know exactly how much fuel is left,” one of them said.
Chandrayaan-2 may orbit Moon for 2 years | India News - Times of India
One major hurdle to that : prolonged extreme cold weather survival. After the 14 Earth days or 1 lunar day there will be 1 lunar night, which again is 14 earth days. In this 1 lunar night the lander and the rover will be subjected to extreme cold weather(around -270 deg C), if after this night the lander and rover manage to re-establish contact with earth this mission will continue otherwise that's the end.
2 ways around that problem. One is not depending on solar energy for rover/lander power, if you don't need the Sun then who cares if its day or night. Two is getting a rechargeable battery, use solar energy and store one part of it in the day, use the battery at night. Or just us ea non-rechargeable battery, use it to run the mission when out of power mission ends.
Now ISRO doesn't claim to have restart capability in the lander/rover. But if you look at the engineering design it does show the presence of rechargeable batteries. Still no guaranties that these batteries will certainly work in these hostile climate. If it does it will be a pleasant surprise, if it doesn't, nobody can blame them since they never claimed to have restart capability.
In the cold environment of lunar night, even a rechargable battery would drain energy and the battery efficiency also deteriorates significantly, leading to reduced stored charge. So it is pretty difficult to wake up, if not the critical electrical & electronics systems are not heated or a minimum temp is not maintained. Most missions use a Radioisotope Heating Unit, if not a radioisotope thermal generator for this heating part
If CY-2 rover Pragyan wakes, it is indeed a great occurence, which paves the way for whole new paradigm in electrical system design in such rovers and surviving the cold harsh nights without active temp management or RHU
In order to recharge batteries (and get any use out of them) you need the instruments & electronics to be working first. The electronics will freeze over beyond recovery during the night unless they are kept heated. Obviously you can't use solar power for heating in the night, so the only solution to recover a lander/rover to working condition after going through a night is if you have an RTG (radioisotope thermonuclear generator) on board in order to continuously provide the power needed for heating.
The Chinese Chang'e-3/4 have the RTGs, which is why they're able to survive.
Chandrayaan-2 does not have an RTG, so survival beyond the first lunar night isn't going to be possible.
It's -270F. Means around -180C.
I used to think RTGs were only meant to supply electricity, didn't think about the heat. Also didn't know the Chang'e-3/4 had RTG, I thought it was just the battery. Thank you for the info.
If you recall a few years back, Chandrayaan-2 was supposed to carry a RTG then that plan was dropped. U. R. Rao Satellite Center(URSC) and BARC worked together to come up with a design.
Isro may give N-boost to Chandrayaan-2 | Mumbai News - Times of India
Problem was BARC couldn't readily supply Pu-238 due to their prior commitments. So not even a prototype of the RTG could be made. BARC promised to supply the required quantities of Pu-238 within a year. But the Chandrayaan-2 was long delayed anyway, ISRO didn't want more delays. So they asked the Russians for Pu-238, the Russians were willing to comply on the condition that we buy their RTG. Understandably, BARC wasn't happy and they expressed their displeasure about the acquisition of a RTG from Russia to the ISRO. ISRO realised these problems weren't going to end anytime soon, so they decided to drop the RTG from the CY-2.
ISRO Puts Off Nuclear Powered Space Mission
The Russians didn't get a deal. Till date URSC and BARC continue to work on making a RTG(and RHU for smaller probes). As to how much progress has been made, I don't know. ISRO didn't publish anything about progress recently, but they do consistently mention the URSC being involved in such a project.
Remember ISRO's Space Science Missions Roadmap: 2008 to 2028 as unveiled by Dr. K. Sivan in September 2018. That plan mentions the future plans for Exo-world missions. Those will certainly require RTGs to work. Let's see what happens.
Oh right, it was Fahrenheit not Celsius. My bad.
Thermoelectric, you mean ?
CY-2 is going to perform the 3rd orbit raising burn today at 14:30-15:30 IST(2:30 PM to 3:30 PM).The targeted orbit is 268 KM x 71558 KM.
After this there are two more burns, on 2nd and 6th of next month. Then its will be the Trans Lunar Insertion burn on 14th of next month. CY2 will reach moon on 20th August.
After this there are two more burns, on 2nd and 6th of next month. Then its will be the Trans Lunar Insertion burn on 14th of next month. CY2 will reach moon on 20th August.
The 3rd orbit-raising has been completed.
It generates electricity by converting heat. And electricity is needed to heat the components, you can't directly bombard the electronics with the decaying isotope, it's not an effective method in of itself.
The next lunar mission (as well as MOM-2 should it include lander+rover configuration) should ideally have an RTG, no need to wait till the Exoworld missions.
Yes.
It generates electricity by converting heat. And electricity is needed to heat the components, you can't directly bombard the electronics with the decaying isotope, it's not an effective method in of itself.
The next lunar mission (as well as MOM-2 should it include lander+rover configuration) should ideally have an RTG, no need to wait till the Exoworld missions.
Yes.
NASA-ISRO agreement on CY-2 about sharing data and stuff.
https://www.mea.gov.in/Portal/LegalTreatiesDoc/US19B3558-1.pdf
https://www.mea.gov.in/Portal/LegalTreatiesDoc/US19B3558-1.pdf
In the midst of all the LoC drama, totally forgot about this :
Fourth earth bound orbit raising maneuver for Chandryaan-2 spacecraft has been performed successfully today (August 2, 2019) at 1527 hrs (IST) as planned, using the onboard propulsion system for a firing duration of 646 seconds. The orbit achieved is 277 x 89472 km.
All spacecraft parameters are normal.
The next orbit raising maneuver is scheduled on August 6, 2019, between 1430 – 1530 hrs (IST).
Fourth earth bound orbit raising maneuver for Chandryaan-2 spacecraft has been performed successfully today (August 2, 2019) at 1527 hrs (IST) as planned, using the onboard propulsion system for a firing duration of 646 seconds. The orbit achieved is 277 x 89472 km.
All spacecraft parameters are normal.
The next orbit raising maneuver is scheduled on August 6, 2019, between 1430 – 1530 hrs (IST).
