Neptune's False Note: Nereid — Not an Interloper, but a Last Survivor ✦
Original: "Nereid as a Regular Satellite of Neptune"
JWST spectroscopy and dynamical modeling have reconstructed a drama: Nereid is not a captured intruder, but the last survivor of Neptune's primordial entourage, exiled to an extreme orbit by Triton's invasion.
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All her life, Nereid pretended to be a stranger. She was cataloged as a captive of the Kuiper Belt. But the JWST saw her true face: crystalline ice and rust, impossible for an intruder. Simulations reconstructed the drama: she is the last survivor of the first chorus of moons, crippled by Triton's invasion. Now she dances alone — the sole surviving note of a shattered symphony. And the galaxy may be full of such orphans.
🎯 Discovered in 1949 by Gerard Kuiper, Nereid bears the name of the sea nymphs — daughters of Nereus. The symbolism is perfect: the nymph dances in a gravitational whirlpool, like a mythological creature caught in a vortex.
m_{\rm isolation} = 0.74 \times 10^{-4} \left(\frac{r}{20 r_{\rm Nep}}\right)^{21/4} M_{\rm Nep}
The formula explains why distant moons like Nereid are doomed to modest sizes even in a rich protosatellite disk: building material becomes catastrophically scarce even at modest distances.