a) Cartosat 2 Series - primary payload.
b) 88xDove (88x3U CubeSats) - 22 QuadPack deployers.
c) 8xLEMUR (8x3U CubeSats) - 2 QuadPack deployers.
d) BGUSat (3U CubeSat), PEASSS (3U CubeSat), DIDO-2 (3U CubeSat), Al-Farabi-1 (2U CubeSat), and Nayif-1 (1U CubeSat) - 1 QuadPack deployer.
e) INS-1A and INS-1B are not in CubeSat format. So, they need to be mounted separately on payload adapter.
So, 1 primary payload + 25 QuadPack deployers + 2 nano-sats in total.
Pics of Quadpacks at: https://spaceflightnow.com/2017/02/14/indian-rocket-set-to-p...
An aside, your username tells me a lot about you :)
I believe in self-taught knowledge.
Curious: when satellites are ejected this way, is it controlled (as in, do they control the ejection velocity etc.) or is it just "dropped" out?
It is now the largest private satellite constellation ever.
Next is to accurately inject all those satellites - either into their respective orbits if it's a multi-orbit mission, or with sufficient time gap and re-orientation between injections if it's a single-orbit mission.
This was a single orbit mission (all sats released into SSO). So, PSLV's 4th stage had to time those 104 satellite injections. It also need to re-orient itself for each injection depending on satellite's requirement. This mission had as many as 103 "separation events". All this logic is pre-programmed and executed by launch vehicle's onboard computer.
Check out QuadPacks lined up before the launch: http://blog.isilaunch.com/the-quadpack-line-up/
And, check out those QuadPacks mounted on PSLV payload adapter around primary payload: https://imgur.com/a/LM9Cp
From what I understand, these satellites were injected into the heliosynchronous orbit (https://en.wikipedia.org/wiki/Sun-synchronous_orbit) at different slots, different angles and at different times.
However, the sole idea behind deploying 104 satellites is not to create a record of some sort but to utilize the maximum capacity of the workhorse rocket (PSLV). This results in greater ROI for the Space Agencies (Antrix / ISRO) as most of these 104 satellites (101 I think) were foreign satellites.
According to this article: http://tech.firstpost.com/news-analysis/isro-to-recover-half... ISRO will recover half of the total cost incurred for the launch from foreign satellites mounted on the PSLV.
+1. The PSLV is one of the world's most reliable launch vehicles. It has been in service for over 20 years.
The question is when, CubeSats will be the primary payload.
> Doesnt the orbit get crowded?
Hope you'll have the answer here:
As long as their orbital information is properly registered and they have a proper end-of-life plan for them there's little risk in deploying new satellites; if you want to get concerned about crowding the orbits, China deliberately blowing up a satellite a couple of years ago was much more problematic.