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The Little Dumbbell Nebula (M76) from Hubble WFC3 data reprocessed by Kyle Eberly — a pearl-blue nebular body crowned by a glowing red hydrogen rim, a bright foreground star anchoring the upper left, faint wings cascading toward the lower edge.
Image data: NASA/ESA Hubble Space Telescope, proposal 17398 (WFC3/UVIS) — public archive. Reprocessed from drizzled archive mosaics by Kyle Eberly / Sitreps.

M76 — The Little Dumbbell, from Orbit

Hubble's 34th-anniversary target — reprocessed from the raw archive through my own pipeline

  • TelescopeHubble WFC3/UVIS (archival)
  • LocationLow Earth orbit (Hubble)
  • ProcessingPublic Hubble archive data — the five-filter set shot for the telescope's 34th anniversary — reprocessed with the same pipeline as my backyard frames. The two broadband filters anchor the true star colors; the hydrogen and oxygen narrowbands add the nebula's structure at their real hues. One honest note: the nebula's western wing extends past the edge of what Hubble observed, so this frame ends where the data ends.

What you're looking at

M76 is a dying Sun-like star caught mid-transformation, about 2,500 light-years away in Perseus. The bright 'cork' — the bar my Seestar sees as a faint smudge — is a dense ring of expelled gas seen edge-on. The wings flowing away from it are older shells, blown off in earlier convulsions and now lit from inside by the exposed stellar core: a white dwarf running at roughly 120,000 degrees, one of the hottest stars known.

The red crown along the top is hydrogen fluorescing where the fastest wind slams into the oldest gas; the pearl-blue body is oxygen glowing in the hollow behind it. Reading the colors is reading the collision, layer by layer.

It's also a quiet catalog oddity: M76 was entered twice in the NGC — the two halves of the cork were catalogued as two separate objects, NGC 650 and 651, before anyone realized they were one thing seen edge-on.

The lesson

Look at the lower-left of this frame: the nebula's western wing runs past the edge, because Hubble's camera simply didn't point there. I could have cropped tighter and hidden that. The frame ends where the data ends, and the picture says so.

That's the discipline worth copying. Every briefing, every analysis, every plan has a frame edge — the line where your information stops and your guessing would begin. The amateur move is cropping so no one sees the edge. The professional move is showing exactly where it is.

Nobody distrusts a map for having a border. They distrust a map that pretends it doesn't.

Object data

Catalog
M76 · NGC 650 + 651 (catalogued twice — one object, edge-on)
Constellation
Perseus
Type
Planetary nebula (bipolar)
Distance
~2,500 light-years
Central star
White dwarf · ~120,000 K — among the hottest stars known
Telescope
Hubble WFC3/UVIS · proposal 17398 (archival, 2024 anniversary)
Filters → color
F475W+[OIII] → B · broadband mid → G · F814W+Hα → R
Companion entry
/astronomy/m76-little-dumbbell — my own 89-minute Seestar capture

More from the journal

The Dumbbell Nebula (M27) photographed from Lakeway, Texas with a ZWO Seestar S50 Pro — a teal-blue apple-core-shaped planetary nebula with red rim caps, in a dense field of white and gold stars. A dual-filter composite.
M27
The Little Dumbbell Nebula (M76) photographed from Lakeway, Texas with a ZWO Seestar S50 — a small blue-white two-lobed planetary nebula in a rich Perseus star field.
M76
The Helix Nebula (NGC 7293) photographed from Lakeway, Texas with a ZWO Seestar S50 — a large ring-shaped planetary nebula with a teal-blue interior and salmon-red outer rim, resembling a giant eye against the star field.
NGC 7293

One photo. One lesson.

New entries land when the sky cooperates. Get them by email — no schedule, no spam, just what the telescope caught and what it taught.