The Heart Nebula (IC 1805) photographed from Lakeway, Texas with a ZWO Seestar S50 Pro — a vast crimson emission nebula filling the frame, its glowing shell cut by dark bays, with the young star cluster Melotte 15 shining at the center.

IC 1805 — The Heart Nebula

The stars it made are the ones carving its shape

TelescopeEva (ZWO Seestar S50 Pro)
Integration208 minutes
LocationLakeway, TX
SkyBortle 6
CapturedOct 17, 2026
PhotoKyle Eberly · © 2026
ProcessingA record that lasted one day — 208 one-minute EQ-mode subs, dual-band filter, until the Soul went deeper the following night. The signal is genuinely thin — the nebula is bright in total but spread across almost the entire frame — and it broke the processing pipeline in instructive ways. The background model had to be fit from the few true-sky corners (anywhere else, the software kept mistaking nebula for sky and politely removing it), and the hydrogen glow had to be measured and amplified rather than just stretched.

What you're looking at

IC 1805 is an emission nebula in Cassiopeia, about 7,500 light-years out in the Perseus spiral arm — roughly 200 light-years across, covering five full moons of sky. It glows that deep crimson for one reason: hydrogen gas, ionized by the stars inside it, recombining and emitting at exactly 656 nanometers. The dual-band filter passes that wavelength and rejects nearly everything else, which is the only reason a backyard in suburban Texas can see it at all.

The engine is Melotte 15, the young cluster at the center of the frame. Its stars are barely 1.5 million years old, and the biggest approach fifty times the Sun's mass. Their radiation and stellar winds inflate the shell, carve the dark bays, and sculpt the pillars — the heart shape isn't an accident of where gas happens to sit, it's the pressure of the cluster's own stars pushing their birth cloud outward.

Next door, just off this frame, sits IC 1848 — the Soul Nebula. Together they're the Heart and Soul complex, one of the Perseus arm's great star factories, and a natural two-panel project for a field this wide.

The lesson

Every star in Melotte 15 condensed out of this cloud. Now those same stars are the dominant force reshaping it — their radiation carves the bays, drives the shell outward, and decides which pillars survive.

Organizations run on the same physics. The people a unit produces become the pressure acting on it. For a while you're a product of the culture; then, without anyone announcing the transition, you're one of the forces determining what it becomes.

You don't get to opt out of that second phase — the only choice is whether you shape the place deliberately or by accident. The cloud doesn't stay the way you found it either way.

The same heart, in infrared — NASA’s WISE space telescope

The Heart Nebula in infrared from NASA WISE data, placed on the same framing as the backyard photo — orange ridges of warm dust along the shell, with the bright dust of the W3 star-forming complex spilling in at the upper left. — This is the identical patch of sky, in heat instead of visible light. Blue is starlight; orange is dust warmed by young stars. Flip between the two views and the shell lines up: where my photo shows red hydrogen rims, the infrared shows ridges of warm dust. The brightest dust, at the upper left, is W3 spilling into the frame, a stellar nursery so buried in dust that its core, just past the left edge, is nearly invisible to my camera but blazes in the infrared.

My telescope: ZWO Seestar S50 Pro — 50 mm lens, visible light
This telescope: WISE — a 40 cm space telescope; smaller than many amateur scopes, but above the atmosphere
The light: 3.4, 4.6 and 12 µm infrared — heat radiation the atmosphere blocks from ever reaching the ground
The data: Six ALLWISE sky-atlas tiles from NASA’s IRSA archive, mosaicked and plate-solved against the Gaia star catalog so the infrared lands on my exact framing

Different light, not more glass. WISE’s mirror is barely bigger than a big backyard Dobsonian — its advantage is sitting above the atmosphere, looking at wavelengths that never reach the ground. Same heart, two kinds of light: my camera sees the glowing gas, WISE sees the warm dust, and together they describe one object neither could describe alone.

Object data

Catalog: IC 1805 · Sharpless 2-190
Constellation: Cassiopeia
Type: Emission nebula (H II region)
Distance: ~7,500 light-years
Size: ~200 light-years — five full moons of sky
Central cluster: Melotte 15 — stars up to ~50× the Sun’s mass
Integration: 208 × 60s — a one-day record, beaten by the Soul

What's next

Done: IC 1848, the Soul Nebula — shot the very next night, 4.4 hours deep. The other half of the Heart and Soul complex now has its own entry, one slot up this page.