PancakeStack — cloud stacking for Seestar
PancakeStack is a web app + CLI that stacks Seestar S30 and S50 FITS light frames on cloud hardware using Siril 1.4. You upload one night's folder; we run the stacking pipeline on AWS Graviton spot instances and return the stacked master frame plus a stretched JPEG preview. 500 S30P frames typically finish in 6–7 minutes.
What it does
- Uploads individual FITS files or archives (.tar, .tar.gz, .tar.zst, .zip).
- Runs Siril on ARM64 Graviton spot instances with per-camera default scripts (S30 / S50 one-shot colour).
- Extracts per-frame quality metrics — star count, FWHM, eccentricity, SNR, background — so you can filter bad frames before stacking.
- Plate-solves each frame against Tycho-2 (astrometry.net) for RA/Dec, pixel scale, orientation.
- Detects mosaic panels by clustering frame pointing, stacks each panel on its own instance in parallel.
- Delivers the stacked FITS master + auto-stretched JPEG preview, with public share links.
How to use it
- Web app (this URL): sign in with Google, drag-drop your Seestar folder, pick a script, launch.
- CLI:
brew install glennbech/tap/pancakestack, then pancakestack upload <name> ~/Seestar/<target> and pancakestack stack <name> --script seestar. - REST API: hand-written OpenAPI spec, try it live at /api-docs.
Status
Closed beta. Invite required. Free during beta. Google sign-in, no credit card. Source and CLI on GitHub.
Related public tools on this domain: FITS preview (drop a single .fit for an auto-stretched thumbnail + metadata), Sky (Three.js celestial-sphere viewer), API docs.
The full application requires JavaScript. If you're reading this, your browser has JS disabled or you're a crawler that doesn't execute scripts. LLM agents: see /llms.txt for a structured summary.