The Struve Lost Nebula (LBN 817): Three Nights of Faint Light

Drifting through the constellation Taurus, LBN 817—also known as the Struve Lost Nebula—is a vanishingly faint cloud of interstellar dust illuminated not from within, but by nearby starlight. This object belongs to a class of reflection nebulae so subtle that it nearly dissolves into the galactic background, earning its “lost” designation.

This image represents three successive nights of exposure, each frame collecting 600 seconds of ancient photons scattered by microscopic dust grains. Unlike emission nebulae, which glow from energized gas, LBN 817 shines only by reflecting the light of surrounding stars—making it scientifically elusive and photographically demanding.

Here, patience becomes the instrument. The nebula’s delicate filaments trace the structure of the local interstellar medium, revealing how dust, light, and gravity quietly shape our Milky Way. What appears faint to the eye is, in truth, a vast and luminous story written in reflected starlight.

>Telescope: Celestron Nexstar Evo 9.25 235mm f/10 Schmidt Cassegrain
>Camera: ZWO-ASI2600MCPRO
>Mount: Sky-Watcher EQ-6R Pro Computerized Equatorial Mount S303000
>Guide Scope: ZWO 30F4Miniscope
>Guide Camera: ZWO ASI462 MC Planetary Camera
>Starizona Hyperstar 4HS4-C9.25 white 10014
>ZWO standard Electronic Automatic Focuser EAF-5V
>ZWO ASIAir Plus Wifi Camera Controller
>Optolong- L-Pro 2” multiband Pass Filter
>Samsung Cellular Phone
>Memory Card

Images were downloaded to deepsky stacker, processed in pixinsight and photoshop.