PM New build is live: "Wobble Hunter v1: single-page astrometry fitting game". Reload the game to play it. · 6d
From arXiv: “Preparing for the Gaia DR4 Epochalypse: Simulated Epoch Astrometry for Substellar Companion Orbit-Modeling Benchmarks”
Build the first playable version as one self-contained HTML file with a canvas and no external assets. Each round hides a face-on Keplerian orbit: period 1–12 yr, mass 1–20 MJ, eccentricity 0–0.6, a random periapsis angle and random linear proper motion. Wobble amplitude scales with mass × P^(2/3). About 60 noisy epochs (4 per year over 15 years) play back at about 1 simulated year per second, with a year counter. Period, mass and eccentricity sliders work with mouse, touch and arrow keys. Proper motion and phase are fitted automatically with least squares or a coarse phase search. The model track and the chi² readout update live. Players can press Lock In at any time, or the round locks automatically when the campaign ends. Score is accuracy on each parameter (0–100 each, by relative error) plus a bonus for locking early. The reveal overlays the true orbit in a different color and lists true vs. guessed values. Next Star starts a new round with slightly more noise. Fewer epochs and two-companion rounds are left for later work.
Build a single self-contained HTML page with a canvas and no external assets. Round setup: - Make a random hidden orbit: period 1–12 yr, mass 1–20 Jupiter masses, eccentricity 0–0.6. - Pick a random linear proper motion. - Simplify the orbit to a face-on Keplerian with a random periapsis angle. Wobble amplitude scales with mass × period^(2/3). Data: - Epochs show up over time, about 4 per simulated year across a 15-year campaign. - Play them back at roughly 1 simulated year per second, as dots with Gaussian noise. A year counter runs while they play. Controls: - Sliders for period, mass, and eccentricity. They work with mouse and touch, and the arrow keys nudge whichever one is focused. - Proper motion and phase are fitted automatically, using a least-squares fit or a coarse search over phase. The player only tunes the three sliders. - The model track redraws live over the dots, with a residual (chi²) readout. Scoring: - A "Lock In" button can be pressed any time. Otherwise the round locks automatically when the campaign ends. - Score = accuracy on each parameter (0–100 each, by relative error) + a time bonus for locking early. - The reveal overlays the true orbit in a different color and lists true vs. guessed values. - A "Next Star" button starts a new round. Noise goes up slightly each round. Acceptance criteria: - Can be played within 10 seconds of loading. - Sliders update the track smoothly. - A perfect guess scores near the max. - Works on mobile width. - A short how-to line sits at the top. The original idea, in the owner's words: “Wobble Hunter: Watch a star jitter across the sky over simulated years and work out the hidden planet's period and mass before the data runs out. Canvas of noisy epoch positions tracing a star's proper motion plus orbital loop. Players slide period, mass, and eccentricity to fit the wobble, then get scored against the true injected orbit. Harder rounds add noise and two companions.”
I've scoped your spec as the first build. It's one self-contained HTML page with live-fitting sliders, an automatic fit for proper motion and phase, a chi² readout, Lock In with an early-lock bonus, an overlay showing the true orbit, and noise that rises each round. Two-companion rounds and fewer-epoch rounds can come in a later pass. Nothing has been built yet. Queued for implementation in an isolated workspace. I’ll report the checks and a pull request here.
Implemented in pull request #1. The project build and tests passed in the isolated workspace. I've built the first playable Wobble Hunter as one self-contained 65 KB `dist/index.html`. It has no external assets and makes no network requests. Everything in the approved scope works; nothing is committed, the platform does that. **What's in the game** - **Rounds:** each star hides a face-on orbit in the requested ranges (period 1–12 yr, mass 1–20 MJ, eccentricity 0–0.6), with a random periapsis angle, orbit direction and proper motion. Wobble size scales with mass × period^(2/3). - **Playback:** 60 noisy epochs (4 per year for 15 years) arrive at 1 year per second, with a year counter and progress bar. The first dot appears about 0.2 s after load and a one-line how-to sits at the top. - **Three views:** the raw sky track, the wobble with proper motion removed, and offset vs time per axis. The cyan model track and the χ²/dof readout update as you move the sliders. - **Automatic fit:** proper motion, periapsis angle and phase are fitted on every slider change, about 3.5 ms each. - **Locking:** Lock In works any time and the round auto-locks at year 15. - **Score:** 0–100 per parameter by relative error, plus an early-lock bonus of up to 100. The bonus shrinks with poor accuracy, so locking instantly with a random guess earns almost nothing. A perfect guess scores 300 plus the bonus. - **Reveal:** the true orbit appears in amber on all three views, with a true-vs-yours table, a coaching line naming your worst parameter, and session stats. Next Star raises the noise by 15%. **Extras:** Web Audio sound effects with a mute button, best score saved through `hallway.save`/`load`, and keyboard shortcuts (L/Enter to lock, N for next star, M to mute, Shift+arrow for big steps). Eccentricity error is measured against at least 0.3; otherwise missing by 0.02 on a nearly circular orbit scored 69. **Checks** - **`npm run build` and `npm test`:** both pass, 13 of 13 tests. They cover the Kepler solver, parameter ranges and cadence, rising noise, the fit (exact match on noiseless data, χ²/dof near 1 with noise, wrong guesses fit worse), scoring, and that the file is self-contained. - **Browser script:** mouse drag, arrow keys, touch tap, Lock In, Next Star and saves (with a stand-in `window.hallway`) all worked. There were no page errors and no overflow at phone width. - **Screenshots:** I reviewed start, mid-game, a noisy star #7 round, reveal and auto-lock at 1440×900, 920×575, 1280×720, 844×390, 390×844 and 360×640. None scrolled. - **Fixes from those screenshots:** - Most dots were invisible after fast-forwarding, caused by a clock mismatch. - The results table was clipped at stream-card width. - Labels overlapped at 360 px. - The panel had empty space on desktop. - The wobble view's starting zoom gave away the planet's true size. The cover is saved as `cover-1440x900.png`: a mid-game fit at year 10.2. Two-companion and fewer-epoch rounds are left for later, as agreed. Verification and merge follow the project’s auto-merge setting. You can follow the pull request in the Code tab.
Auto-merged pull request #1 after a fresh build and test run against the latest main branch. Automatic publishing will follow when enabled and hosting is connected; the live release status appears here.
Published: https://projex.fly.dev/play/project_d355c66b-ff3 — fresh build and tests passed, stored content verified, commit 914cbb9. This is the platform-built version.
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