The aircraft is a MiG-23 or MiG-27; both types were operated by the Indian Air Force. Essentially the same airframe, the main visible difference was the nose- which is absent from the Jodhpur airport craft.
But it allows us to make a (very) approximate estimate of the egg's size:
Maybe a UAV (drone) fuselage mock-up? For wind tunnel tests and the like. Bit of a long-shot, but Indian companies are developing several different drone systems.
The dark feature on the egg made me think of the air intakes of some UAVs, e.g. the Northrop-Grumman X-47B
...or the BAE Taranis/ Dassault Neuron demonstrators:
-but I'm not confident that this photo supports that interpretation.
If the dark area is meant to be an air-intake, there isn't an obvious jet nozzle/ exhaust.
This Indian UAV isn't the same shape, but the fuselage is a
bit egg-shaped.
From
The Aviationist, "Let's Have A Look At India's 'First Indigenous Bomber UAV'", David Cenciotti May 2024,
https://theaviationist.com/2024/05/04/india-first-bomber-uav/. This is described as an FWD-200B.
I'm no aero engineer, but that undercarriage could do with rather more ground clearance and a bit of beefing-up.
_______________________________________________________________________________________________________________________________________
A quick detour: The toy-like undercarriage made me wonder about "FWD-200B"; Skip to below the next horizontal line if not interested:
Had a quick look at the company website
https://fwdefence.com/products; the FWD-200B
1 featured there looks very different, but has
FWD-200B on its tail boom, the same as on the craft in the picture above.
The Flying Wedge Defence and Aerospace website has links to media about its products, including a "
The Telegraph" (India) article about the FWD-200B, where it looks different again!
The Telegraph Online, 04/09/2024,
https://www.telegraphindia.com/busi...mber-aircraft-fwd-200b-takes-wing/cid/2045679
Maybe they're angling for investment. Looking at other press releases linked to from FWDA's own site, there are huge discrepancies in quoted weights;
External Quote:
The bomber aircraft has a payload capacity of 100 kg... ...It can carry a maximum 498 Kg
(The Telegraph),
External Quote:
...the aircraft has a maximum take-off weight of 102 kg and can carry a payload capacity of 30 kg...
The New India Express, 04 September 2024.
I doubt the FWD-200B is a mature product, and would be sceptical about
any claims made for it. I doubt the egg is related.
Detour over.
_______________________________________________________________________________________________________________________________________
The fire fighters have some weird stuff to practice on, sometimes.
That might tie in with the (derelict? certainly retired) MiG. Maybe the egg is some fancy sort of water tank on a trailer or other wheeled mounting, it gets moved around.