Last week, New Horizons crossed the 50 AU milestone,i.e. approximately 8 billion km (5 billion miles) from Earth. That implies that it must still be in the Kuiper belt, which is 30 AU- 50 AU from the Sun, but NASA stated that New Horizons will study additional Kuiper belt objects. So what's next for the spacecraft? It crossed 486958 Arrokoth (Ultima Thule) two years ago and I haven't heard of any other flybys since then. There are many dwarf planets like Makemake, Ceres and Haumea that it has already crossed....what is the next target?
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1$\begingroup$ This might satisfy you: New Horizons: 2019 Onward $\endgroup$– BrendanLuke15Apr 25, 2021 at 20:45
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1$\begingroup$ What's next for New Horizons? (parallax results shown/discussed here and here) also see Distance to Proxima Centauri (Gaia VS New Horizons parallax program) and Can New Horizons be used to measure the distance to Betelgeuse (despite its fickle photocenter)? $\endgroup$– uhohApr 25, 2021 at 22:05
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2$\begingroup$ Answers to this question explain that New Horizons didn't just observe Arrokoth when it was passing through the Kuiper Belt; its long-range instruments could also render information about dozens of other objects even though the spacecraft did not fly close by. What I don't know is how long that can continue now that the Kuiper Belt is technically behind the craft. $\endgroup$– Oscar LanziApr 25, 2021 at 22:28
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New Horizons was extended into 2021, so it will be exploring other Kuiper Belt objects. I don't think it's determined yet which ones. Alan Stern (PI of New Horizons) says the proposals for the next flyby are due January 2022 with decisions made in April 2022.
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$\begingroup$ Technically, is it still the Kuiper Belt or is it now the Scattered Disk? $\endgroup$ Apr 26, 2021 at 20:43
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1$\begingroup$ @OscarLanzi from what I know from reading up on the New Horizon before asking the question here, it should have crossed the Kuiper Belt some time back, as Kuiper Belt is 50 AU from the Sun at max, and New Horizon crossed 50 AU from Earth, but I am not sure, as NASA said they will study more Kuiper Belt objects? So maybe it's hanging around there somewhere not really going further as of now? $\endgroup$ Apr 27, 2021 at 19:10