Yes, this one:
https://en.wikipedia.org/wiki/Intelsat_901
Since engine bells are on practically every satellite, and they are usually of the same overall shape, they are the best way to hook onto something that was not designed to be serviced. Since JWST is in that (large!) category, I expect that a servicing mission would mostly do that (assuming the instruments are still good in 2035, or whenever).
And a photo of JWST fully deployed would be pretty awesome, of course

JWST's mirror and instruments will be in the dark, so there should never be a photo of them.

Project scientist John Mather said, "In-space refueling of #JWST? Logically possible but difficult." I would presume that this will not occur.

In the case of Intelsat, it was just attached and used its own thrusters to push the satellite where needed. No need to open anything up. Though I digress, this is is all strictly academic, and hopefully will remain so for a very long time to come!

Brrr... Winter is Coming!

Pretty sure I recall a NASA official saying they would not even think about a robotic refueling mission till the telescope was on-station and operational and proving its worth. Then they would begin work. Might have been Zurbuchen.

Whether it would be a robotic arm uncapping the gas tanks, or clip-on module, or something else, wasn't said. Since this is likely 10-15 years out, there's plenty of time to develop and refine the technicals.

Fun looking at this 16 years later...

... is there an engineering camera that can return "unfolding images" ... it seems that for $10,000,000,000 they could put one 1024x1024 camera on JWST --- and test out the radio and such -- You could always shut it down when unfolded...

I'm sure we would have seen those images. Good PR. I also remember them saying on the launch livestream that the solar panel deploy would be the last time anyone would ever lay eyes on JWST.

Of all the spacecraft we've launched, this is the one that would be the most satisfying to see after it fully deploys.

Well, that's a compromise you make when you realize that launches to orbit cost IIRC, their weight in gold,
(while Mars / outer solar system cost their weight in diamonds)
Once somebody figures out how to do an integrated thin-film mylar solar array / 20 megapixel camera chip, we might get some interesting deployment videos.

Did anybody ELSE have a "WOW" moment when Breakthrough-Starshot mentioned that they were looking imprinting a hologram of a light stable sail onto a flat surface?

TANGENT - Could a James Webb v 2.0 "cheat" by imprinting a hologram of a 40m scope onto bigger mylar sail?

Once the sunshield is partially unfolded, the rest of JWST will be in the dark for the remainder of its mission and they don't want sunlight on it, even now. Any sunlight on the mechanisms now is just a delay before the long passive cooling process will complete.

If you want to picture JWST during its mission, picture the night side of an atmosphere-less world. That's what it's going to look like: black on black.

For reference, the operational temperature will be a little warmer than Triton but a little cooler than the satellites or Uranus. The effect of perpetual shade will be about like having it out at 25 AU.

Perhaps a low light camera can see the silhouette and/or use starlight (if it doesn't emit too much heat energy, or somehow get in the way of the deployment)?

As for refueling, IIRC the fuel tank may be accessible just in case.

The sunshield covers have now been released and rolled up!

https://blogs.nasa.gov/webb/2021/12/30/webb...nshield-covers/

Maybe they left out cameras to eliminate any unnecessary heat generating activities, especially on the cold mirror side.

Some suspense with a successful first side arm deployment of the sun shield:

https://blogs.nasa.gov/webb/2021/12/31/firs...-booms-deploys/

It looks like they're giving themselves some time after successfully extending both booms.

Tensioning will start tomorrow.

Webb Sunshield Tensioning To Begin Tomorrow

Edit -

Here it is, the next day. The JWST team has decided to take another day and proceed tomorrow.

Deployment Timeline Adjusted as Team Focuses on Observatory Operations

The spacecraft was originally scheduled to launch in 2007. I suspect that its design was set in stone before the the recent proliferation of high resolution engineering cameras in planetary missions became practical. I doubt that a proposal to add such cameras during the final years of testing and trouble-shooting would have been viewed with much enthusiasm, even if the cameras could have seen anything and wouldn’t be a risk to the operating temperature.