The Merope Nebula in the Pleiades

NGC 1435, commonly called the Merope Nebula, is a galactic nebula nestled within the Pleiades region in Taurus. German astronomer Wilhelm Tempel discovered this elusive object on October 19, 1859.

With an integrated magnitude of 6.8, NGC 1435 sounds reasonably bright on paper—but here's the challenge: its average surface brightness sits at a dim 21.6 mag/arcsec². This low surface brightness makes the nebula a notoriously difficult target for visual observers. Successfully observing NGC 1435 typically requires telescopes with apertures of 200mm or larger. That said, skilled observers have occasionally managed to detect nebular structure using smaller instruments in the 50-100mm range under excellent conditions—though this remains quite challenging.

IC 349, better known as Barnard's Merope Nebula, is a reflection nebula embedded within the Pleiades star cluster. Located in the constellation Taurus along the ecliptic, this intriguing object was discovered in 1890 by American astronomer Edward Barnard. The nebula shines with light borrowed from Merope, positioned just 0.06 light-years (30 arcseconds) away from this luminous star. What makes IC 349 fascinating is its nature: it's not a leftover from Merope's birth cloud, but rather an interstellar dust cloud currently drifting past the star. Merope's intense radiation sculpts the cloud's structure while simultaneously illuminating it through reflection. Evidence suggests this is a compact, localized dust concentration within a much larger gas complex—most likely a fragment torn from the extensive Taurus-Auriga molecular cloud. The nebula presents a roughly triangular shape dominated by an exceptionally dense, bright core. This central region outshines every other nebula in the Pleiades by more than 15 times, making it remarkably distinctive. This extraordinary brightness confirms IC 349 as the only substantial dust cloud positioned close to a star anywhere within the Pleiades cluster.

Exposure Data:

• Telescope: 10" Newton, GPU Corrector, f=1000mm, f/4

• Camera Atik 460Exm with Baader RGB filters

• Exposure Times

  • 9x300s R

  • 9x300s G

  • 9x300s B

• Total: 2h15min

• Date: 12/31/2025

• Location: Bad Kreuznach + Fuerfeld / Germany

• Mount Skywatcher EQ8R-pro / Pegasus Astro EQMod

• Guiding and Exposure Control with INDI / PHD2 / CCDCiel running on XUbuntu Linux

• Image Processing PixInsight and Darktable

Sources: https://en.wikipedia.org/wiki/IC_349