Author Topic: Microsat-R - PSLV DL C44 - January 24 2019  (Read 15118 times)

Offline worldtimedate

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Re: Microsat-R - PSLV DL C44 - January 24 2019
« Reply #40 on: 01/16/2019 05:55 am »
The lowest ever payload PSLV has so far launched into orbit was 295 kg of TechSar on 21 January, 2008 with the Core alone version. I don't understand why ISRO is not using Core Alone Version when the payload was so low and whether other payloads are available is not known. Both Emisat and Microsat-R and even Cartosat could have been launched together, thus leveraging PSLV-XL's launch capacity of over 1800 kg. I think, it is wastage of such a launch vehicle by launching PSLV with low payload.

Offline chota

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Re: Microsat-R - PSLV DL C44 - January 24 2019
« Reply #41 on: 01/16/2019 12:33 pm »
Launch kit out

Quote
PSLV-C44 is the first mission of PSLV-DL and is a new variant of PSLV.


Quote
In PSLV-C44, the fourth stage (PS4) of the vehicle will be moved to higher circular orbit so as to establish an orbital platform for carrying out experiments. Kalamsat, a student payload will be the first to use PS4 as orbital platform.

Quote
PSLV-C44 will also carry Microsat-R, an imaging satellite

Online ZachS09

Re: Microsat-R - PSLV DL C44 - January 24 2019
« Reply #42 on: 01/17/2019 02:17 am »
The lowest ever payload PSLV has so far launched into orbit was 295 kg of TechSar on 21 January, 2008 with the Core alone version. I don't understand why ISRO is not using Core Alone Version when the payload was so low and whether other payloads are available is not known. Both Emisat and Microsat-R and even Cartosat could have been launched together, thus leveraging PSLV-XL's launch capacity of over 1800 kg. I think, it is wastage of such a launch vehicle by launching PSLV with low payload.

I think the reason why ISRO's going with the DL version is because it hasn't been tested yet. It's only the third vehicle that has only two boosters. The other two were the ASLV (which was flown way back when) and the GSLV Mk.3 (which is ISRO's biggest indigenous rocket).

It would make sense to use the CA variant since the payload mass is so light, but if ISRO wants to attach boosters on the first stage, I do not blame them.
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Offline russianhalo117

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Re: Microsat-R - PSLV DL C44 - January 24 2019
« Reply #43 on: 01/17/2019 03:47 am »
The lowest ever payload PSLV has so far launched into orbit was 295 kg of TechSar on 21 January, 2008 with the Core alone version. I don't understand why ISRO is not using Core Alone Version when the payload was so low and whether other payloads are available is not known. Both Emisat and Microsat-R and even Cartosat could have been launched together, thus leveraging PSLV-XL's launch capacity of over 1800 kg. I think, it is wastage of such a launch vehicle by launching PSLV with low payload.

I think the reason why ISRO's going with the DL version is because it hasn't been tested yet. It's only the third vehicle that has only two boosters. The other two were the ASLV (which was flown way back when) and the GSLV Mk.3 (which is ISRO's biggest indigenous rocket).

It would make sense to use the CA variant since the payload mass is so light, but if ISRO wants to attach boosters on the first stage, I do not blame them.
I think it is due to the PS4 final orbit in addition to version first flight. They are transitioning PSLV family to provide a Vulcan like offering of 0, 2, 4, 6 SRMs. There is also a push to standarize the first two stages of PSLV and GSLV Mk-2 so we could end up with an Ariane-4 family architecture for Strapon boosters.

Offline K210

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Re: Microsat-R - PSLV DL C44 - January 24 2019
« Reply #44 on: 01/17/2019 11:10 pm »
Mass of Microsat-R has been revised upwards to 700 kg. User is DRDO (Defence Research and Development Organisation) so that explains the secrecy around this launch.

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“We will be launching 700-kg Microsat-R and Kalamsat with a new variant of Polar Satellite Launch Vehicle (PSLV). In order to reduce the weight and increase the mass, an aluminum tank is used for the first time in the fourth stage,” K. Sivan, Chairman of Indian Space Research Organisation (ISRO), told IANS on Thursday.

Source: http://www.easternmirrornagaland.com/isro-opens-new-year-launching-satellite-for-drdo-and-a-student-satellite/

Offline TheVarun

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Re: Microsat-R - PSLV DL C44 - January 24 2019
« Reply #45 on: 01/18/2019 01:47 pm »
That is no trivial alteration!  Now, the launch and its configuration make a lot more sense to the lay viewer. The first impression was that because they are trying out something new with the orbital fourth stage and two strap-ons, the satellite weight was kept down.  Nice, looking forward to the launch next Thursday.

Offline chetan_chpd

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Re: Microsat-R - PSLV DL C44 - January 24 2019
« Reply #46 on: 01/18/2019 01:50 pm »
PSLV-C44 Fourth stage PS-4 as orbital platform for experiments-said to be first of it's kind in world.

(ISRO chairman press conference highlights
https://www.chetansindiaspaceflight.com/2019/01/news-update-isro-chairman-press.html)

Online Stan Black

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Re: Microsat-R - PSLV DL C44 - January 24 2019
« Reply #47 on: 01/20/2019 11:34 am »
To clear up any confusion the two strap ons used will be S12's (used on PSLV-XL).

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On the new ‘DL’ type, the twin boosters will burn at lift-off to give additional thrust to the rocket. The boosters will carry 12 tonnes of propellant.

Source: https://www.thehindu.com/news/national/kerala/pslv-lift-off-with-added-features/article25981654.ece

Does one have SITVC?
https://www.isro.gov.in/sites/default/files/galleries/%20PSLV-C44%20Gallery/06hoistingofoneofthestrap-onsofpslv-c44duringvehicleintegration.jpg

Offline Salo

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Re: Microsat-R - PSLV DL C44 - January 24 2019
« Reply #48 on: 01/20/2019 01:42 pm »

Offline Salo

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Offline Salo

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Re: Microsat-R - PSLV DL C44 - January 24 2019
« Reply #50 on: 01/20/2019 01:51 pm »

Offline A.K.

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Re: Microsat-R - PSLV DL C44 - January 24 2019
« Reply #51 on: 01/20/2019 02:16 pm »
Pardon me I'm a noob, I'm sometimes wonder if they paint redoxide on PSLV stages, it looks red.

Offline jcm

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Re: Microsat-R - PSLV DL C44 - January 24 2019
« Reply #52 on: 01/20/2019 04:14 pm »
A protototype of Kalamsat was launched on a NASA RockSat sounding rocket mission, NASA 41.121UO Terrier Improved Orion, from Wallops in 2017 Jun. https://www.paisawapas.com/student-stories/satellite-by-nasa-designed-by-an-indian-teen-kalamsat-weighs-64grams-worlds-lightest-satellite/
and http://www.spacekidzindia.com/proud-moment.html
It is a 0.064 kg, 0.038m-cube femtosat, so kind of underusing the PS4's capabilities!
I think this launch needs to be regarded as mainly a launch vehicle test flight and test of the PS4 bus systems.
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Offline vineethgk

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Re: Microsat-R - PSLV DL C44 - January 24 2019
« Reply #53 on: 01/20/2019 09:59 pm »
With an orbital altitude of 274 km that is essentially half of the Cartosat 2S equivalent, and a stated launch mass of 714 kg which is similar to that of earlier Cartosat 2S birds for Microsat-R (hardly a 'microsat', and R - Reconaissance/Radar?), one possibility could be that they are attempting to use Cartosat-2S hardware at a much lower orbital altitude (and with a shorter orbit life if not for frequent propping up) to capture very high resolution images for strategic purposes than were possible with other satellites in the series flying at over 500km.
« Last Edit: 01/20/2019 10:04 pm by vineethgk »

Offline Salo

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Re: Microsat-R - PSLV DL C44 - January 24 2019
« Reply #54 on: 01/21/2019 09:02 am »

Offline K210

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Re: Microsat-R - PSLV DL C44 - January 24 2019
« Reply #55 on: 01/22/2019 12:26 pm »
Brochure screenshots + PDF attached

Source: https://www.isro.gov.in/pslv-c44/pslv-c44-launch-brochure


Offline SciNews

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Re: Microsat-R - PSLV DL C44 - January 24 2019
« Reply #56 on: 01/23/2019 11:09 am »
PSLV-C44 ready to launch Microsat-R and Kalamsat

edited version of https://www.isro.gov.in/pslv-c44/pslv-c44-curtain-raiser-video-english

Offline starbase

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Re: Microsat-R - PSLV DL C44 - January 24 2019
« Reply #57 on: 01/23/2019 11:58 am »
Complete curtain raiser video (incl. cheesy background music after intro):

« Last Edit: 01/23/2019 11:59 am by starbase »

Offline worldtimedate

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Offline worldtimedate

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Re: Microsat-R - PSLV DL C44 - January 24 2019
« Reply #59 on: 01/23/2019 08:43 pm »
The countdown for the launch of PSLV-C44 mission started today at 19:37 Hrs (IST) from Satish Dhawan Space Centre (SDSC) SHAR, Sriharikota. The launch is scheduled at 23:37 Hrs IST on 24th January 2019

Source :
https://www.isro.gov.in/update/23-jan-2019/countdown-launch-of-pslv-c44-mission-started-today-1937-hrs-ist-satish-dhawan

https://twitter.com/isro/status/1088100436178018304?p=v

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