Upon news of RocketLab's successful flight of the Electron launch vehicle, it was announced that not only had they deployed the three onboard payloads into the desired orbit, they had done so using a newly developed kick stage powered by an engine called Curie:

The successful launch of Rocket Lab’s Electron rocket Jan. 20 also tested a kick stage designed to circularize the orbits of its satellite payloads. [...] The heart of the kick stage is Curie, an engine developed by Rocket Lab.

From SpaceNews' article: Rocket Lab launch also tested new kick stage.

An image of the Curie kick stage can be seen in this photo supplied by RocketLab:

enter image description here

However, the kicker is that this doesn't appear to be using the typical monopropellant of Hydrazine:

The heart of the kick stage is Curie, an engine developed by Rocket Lab. Beck described the engine, capable of performing multiple burns, as 3D-printed and using an unspecified “green” monopropellant. [Emphasis mine]

What is this green monopropellant? Is it similar to AF-M315E, LMP-103S, or something else entirely?

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    $\begingroup$ Reddit chatter suggests (with no citations) either AF-M315E or RocketLabs' patented "viscous liquid monopropellant (VLM)", a thixotropic goo: google.com/patents/US20120234196 -- personally, though, and also without citations, I think if it were anything more exciting than peroxide they'd be bragging about it. $\endgroup$ Jan 24 '18 at 21:29
  • $\begingroup$ @RussellBorogove it's clear from that patent that the oxidizer is some kind of organic nitrate, not peroxide. Better specific impulse than peroxide but not particularly exciting. It's also clear that they're premixing fuel and oxidiser, which has some safety implications. $\endgroup$ Jan 24 '18 at 22:25
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    $\begingroup$ I'm saying I suspect Curie's propellant is something old-school like peroxide monoprop rather than VLM, because if they were using their patented goo for the kick motor they'd want to say so, not that peroxide is part of VLM. $\endgroup$ Jan 24 '18 at 23:00
  • $\begingroup$ JAXA SHP163 might be another interesting candidate, which is HAN-based, like AF-M315E. However, it is unlikely Curie is running either on HAN or ADN based propellants as these have not been scaled up that big $\endgroup$
    – kert
    May 8 '19 at 15:55
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    $\begingroup$ Also, Curie does NOT use VLM as per Peter Beck: reddit.com/r/space/comments/8a1wwy/… $\endgroup$
    – kert
    May 8 '19 at 16:16

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