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astro-ph.SR 4

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2026 4

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Ancient 'ghost' planetary nebulae discovered with amateur telescopes

astro-ph.SR · 2026-04-22 · unverdicted · novelty 6.0

Three new candidate ancient planetary nebulae, each several arcminutes across with extremely low [O iii] surface brightness around 30 mag arcsec^{-2}, were discovered using amateur telescopes, with candidate central stars yielding age estimates of 50-100 thousand years.

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