La Nebulosa Variabile di Hubble (Hubble’s Variable Nebula, NGC 2261) è una nebulosa a riflessione situata nella costellazione dell’Unicorno (Monoceros), a circa 2.500 anni luce dalla Terra. È illuminata dalla giovane stella variabile R Monocerotis e deve il suo nome alle evidenti variazioni di forma e luminosità osservabili nel tempo. Questi cambiamenti sono causati da ombre proiettate dal materiale circumstellare vicino alla stella, rendendo NGC 2261 un oggetto unico nel suo genere. 🔭 GSO 8” f
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