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Chethan Kumar

@Chethan_Dash

Aug 8

@isro

#Thread #Update #SSLV

Here We Go: @isro, which couldn’t put put satellites into their desired orbit in its maiden launch attempt of #SSLV yesterday, is studying the various salvage options the rocket can employ to achieve a different result. 1/n

https://twitter.com/Chethan_Dash/status/1556493541437632512

While an expert committee has begun its investigation into Sunday’s mission and would eventually make a set of recommendations, preliminary findings show that the velocity trimming module (VTM) — the terminal stage of the rocket — could not ignite. 2/n

After a smooth lift-off, 1st three stages performed nominally. Mission entered terminal stage where VTM was to ignite & place sats into desired orbit. For this, onboard comps needed info from accelerometers (sensors), based on which VTM's workload would be decided. 3/n

Read 12 tweets

Chethan Kumar

@Chethan_Dash

Aug 7

@isro

#UPDATE #Thread #Moon #India

In another finding, data from #Chandrayaan2 has shown that plasma density in Moon’s ionosphere in the wake region is at least one order of magnitude more than that present in the day side. 1/n

Pic: @isro

#Chandrayaan2 carried several payloads, among which, the Dual Frequency Radio Science (#DFRS) was designed to study the lunar ionosphere. It was conceptualised and jointly developed by SPL of VSSC; URSC and Istrac. 2/n

@isro

Pointing out that the Moon’s ionosphere, which derives its origin from the atmosphere believed to be very tenuous, @isro said, the plasma density was considered to be only a few hundred ions per cubic centimetre. 3/n

Read 14 tweets

Chethan Kumar

@Chethan_Dash

Jun 3

#Update #Space #Telescope #Debris #Asia

A new telescope facility in the Himalayan range will now keep a watch on the overhead sky to identify transient or variable objects such as #supernovae, #gravitational lenses, #space #debris, and #asteroids. 1/n

Commissioned at Devasthal in Uttarakhand, it'll help survey the sky making it possible to observe #galaxies & other astronomical sources just by staring at the strip of sky that passes overhead. It's the first liquid mirror telescope in India & the largest in Asia. 2/n

@ARIESNainital

Built by astronomers from India, Belgium and Canada, the novel instrument employs a 4m diameter rotating mirror made up of a thin film of liquid mercury to collect and focus light. It’s at an altitude of 2,450m at @ARIESNainital Devasthal observatory campus. 3/n

Read 16 tweets

Chethan Kumar

@Chethan_Dash

Jun 1

@NASA

#JustIn #Thread #Space

Payload integration of #NISAR, a @NASA & @isro joint mission, has been completed. It will be shipped to India later this year for integration with the satellite and eventually the launch vehicle. (It will be launched by Isro) 1/n

@isro

A dual SAR mission, #NISAR is a first-of-its-kind endeavour that will be able to operate in two frequencies, both in bands lower than KU-Band or AA-Band. While @isro will develop and provide the S-band radar (12-cm wavelength), @NASA will supply L-band radar (24-cm). 2/n

Thomas Zurbuchen, associate administrator, NASA science mission directorate on future Space exploration, terming it an extremely complex mission, said progress had been made on NISAR after Covid-induced delays. 3/n

Read 10 tweets

Chethan Kumar

@Chethan_Dash

May 20

@IAF_MCC

Here We Go: #Exclusive #Thread #Update

With the #Ukraine crisis preventing the use of the preferred AN-124 aircraft, India's #GSAT24 has been shipped to French Guiana for its June 22 launch on @IAF_MCC Globemaster (C-17) aircraft (see pic). 1/n

https://twitter.com/Chethan_Dash/status/1527210386747170821

Most satellites around the world are transported using the AN-124 aircraft which offers loading and unloading options most suitable for sensitive equipment/systems that satellites are made of (see representative pic)… 2/n

@NSIL_India

…And, as per sources in @NSIL_India, which is launching #GSAT24 as a dedicated satellite for Tata Play’s (formerly TataSky) DTH services, the initial plan was to ship the satellite using an AN-124. 3/n

Read 11 tweets

Chethan Kumar

@Chethan_Dash

May 19

@isro

Here we go: #update #thread #Space

@isro, as part of its preparations for India’s first human spaceflight mission — #Gaganyaan — is planning seven integrated air-drop tests (IADTs) of simulated crew modules, which will validate the parachute system. 1/n

https://twitter.com/Chethan_Dash/status/1526924138178174976

While some tests in the run-up to these 7 tests have been completed, IADTs will be crucial before moving ahead to the next phase. The space agency has already completed the preliminary structural design of the crew seat assembly, the IADT structure design of the crew module. 2/n

“For validation of the parachute system, seven IADTs are planned with a simulated crew module, maintaining external configuration similar to flight… 3/n

Read 13 tweets

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