An overview of the Tomo-e Gozen camera 2K×1K CMOS image sensor by Canon 84 CMOS sensors are tiled over the focal plane covering area ~ 20deg2 moon ~ 9degree
An overview of the Tomo-e Gozen camera Specifications Observatory Kiso Observatory Telescope 1.0-m f/3.1 Schmidt telescope Sensor format 2160×1200pixchip-1 Field of view 39′.7×22′.4 × 84chips Pixel scale 19μm, 1″ .189pix-1 Wavelength 350−700nm (peak at 500nm) Filters optical broadband (transparent) Frame rate 2Hz (max, continuous, full frame) Read noise ~ 1.9e- at 2Hz Dark current ~ 0.1e-sec-1pix-1 at 277K Well depth ~ 6,400e - 5σ lim. mag. ~ 18.5mag. in 0.5sec exposure
Kiso Observatory Telescope 1.0-m f/3.1 Schmidt telescope Sensor format 2160×1200pixchip-1 Field of view 39′.7×22′.4 × 8chips Pixel scale 19μm, 1″ .189pix-1 Wavelength 350−700nm (peak at 500nm) Filters optical broadband (transparent) Frame rate 2Hz (max, continuous, full frame) Read noise ~ 1.9e- at 2Hz Dark current ~ 0.1e-sec-1pix-1 at 277K Well depth ~ 6,400e - 5σ lim. mag. ~ 18.5mag. in 0.5sec exposure Prototype of Tomo-e Gozen a prototype of the Tomo-e Gozen mounted on the 1.0-m Schmidt telescope a HDR image of the Orion BN region composed of ~5,000× 0.5s exposures
Kiso Observatory Telescope 1.0-m f/3.1 Schmidt telescope Sensor format 2160×1200pixchip-1 Field of view 39′.7×22′.4 × 8chips Pixel scale 19μm, 1″ .189pix-1 Wavelength 350−700nm (peak at 500nm) Filters optical broadband (transparent) Frame rate 2Hz (max, continuous, full frame) Read noise ~ 1.9e- at 2Hz Dark current ~ 0.1e-sec-1pix-1 at 277K Well depth ~ 6,400e - 5σ lim. mag. ~ 18.5mag. in 0.5sec exposure Prototype of Tomo-e Gozen a prototype of the Tomo-e Gozen mounted on the 1.0-m Schmidt telescope a HDR image of the Orion BN region composed of ~5,000× 0.5s exposures
the Tomo-e Gozen 6× 0.5s exposures 6× 0.5s exposures 6× 0.5s exposures 6× 0.5s exposures 2× 2 dithering ~10,000deg2 sky will be covered in 2hours ~ > 3 images will be taken of each point per night.
20m class NEOs Detection of 20m class NEOs with a 1-m telescope ⇉ the distance to the NEO should be small (d ≪ 1au) ⇉ an aparent motion is not negligible mock image A fast-moving object appears as a line segment The surface brightness degraded: "Trail Loss"
20m class NEOs Detection of 20m class NEOs with a 1-m telescope ⇉ the distance to the NEO should be small (d ≪ 1au) ⇉ an aparent motion is not negligible mock image A fast-moving object appears as a line segment The surface brightness degraded: "Trail Loss" Trail Loss effect ∝ tpix /texp
20m class NEOs Detection of 20m class NEOs with a 1-m telescope ⇉ the distance to the NEO should be small (d ≪ 1au) ⇉ an aparent motion is not negligible A fast-moving object appears as a line segment The surface brightness degraded: "Trail Loss" ⇉ detactabilies are estimated: Sun Earth NEO [Lkm] d zero phaseangle, distance d, diameter L Trail Loss effect ∝ tpix /texp
20m class NEOs Detection of 20m class NEOs with a 1-m telescope ⇉ the distance to the NEO should be small (d ≪ 1au) ⇉ an aparent motion is not negligible A fast-moving object appears as a line segment The surface brightness degraded: "Trail Loss" ⇉ detactabilies are estimated: Sun Earth NEO [Lkm] d R V zero phaseangle, distance d, diameter L the relative velocity ~ Keplerian rotation Trail Loss effect ∝ tpix /texp
20m NEOs Detection of 20m class NEOs with a 1-m telescope ⇉ the distance to the NEO should be small (d ≪ 1au) ⇉ an aparent motion is not negligible A fast-moving object appears as a line segment The surface brightness degraded: "Trail Loss" ⇉ detactabilies are estimated: Sun Earth NEO [Lkm] d R V zero phaseangle, distance d, diameter L the relative velocity ~ Keplerian rotation the detection threshold ⇆ S/N ≧ 5 Trail Loss effect ∝ tpix /texp
Gozen: a wide-field CMOS mosaic camera The next flagship instrument at Kiso Observatory, the University of Tokyo. Equipped with 84 CMOS sensors, covering about 20deg2. The Tomo-e Gozen is able to take images continuously at 2Hz. Optimized for a shallow, high-cadance, and wide-area (~10,000deg2) survey. The Tomo-e Gozen can detect 20m-class asteroids at a distance of ~0.01au. 2013 2014 2015 2016 2017 2018 Sensor Development Sensor Evaluation Camera Design Assembly Observation 8-chip first light 21-chip first light 84-chip first light