Grass Valley, CA, USA
I captured a disk-like object with astro-photography equipment, and can not explain it with my astronomy, physics, or camera knowledge.
Report quality: Moderate55/100
This score reflects report-quality signals on file — how complete, corroborated, and precisely located the report is — not a claim about whether the sighting was a real craft.
- Duration parsed: 300s, a plausible sighting length
- Detailed witness text (135 characters)
- Location geocoded exactly
- No other reports from this city within 3 days
- When
- 2020-10-07
- Where
- Grass Valley, CA, USA
- Shape
- Disk
- Duration
- 5 minutes
- Geo
- 39.219, -121.061 · exact
- Slug
- disk-over-grass-valley-ca-2020-bf1e8f
Part of a wave
The Navy Encounters & the UAP Era
U.S. training ranges (Pacific off San Diego; Atlantic off Virginia), then worldwide reporting
The wave that renamed the subject. The USS Nimitz 'Tic Tac' encounter (November 2004: radar drops from 80,000 ft to sea level in seconds, pilot visual by Cmdr. David Fravor, FLIR video) stayed classified-adjacent until…
In context
- Grass Valley, CA shows up 34 times across the archive.
- 622 reports came from California in 2020.
- In the 2020s, 3.8% of reports described a disk — the all-time rate is 5.9%.
Report
Full narrative lands with dossier import for famous cases, or the NUFORC free-text summary above for standard reports. This shell is SSR-ready: one D1 row (including connections_json) per page.