An Introduction to Hyper Suprime-Cam (HSC)
The Hyper Suprime-Cam (HSC) is the next generation camera on the Subaru Telescope, replacing its’ predecessor Suprime-cam that had been used for 18 years. The field of view (FOV) has been dramatically increased from 0.16 to 1.5 square degree (10 times!!!). The HSC has not only a large FOV but it is also mounted on one of the biggest telescopes in the world. The camera’s ability and efficiency are the mightiest in the current observatories. HSCs physical extent is larger than three meters. Its focal plane (60 cm in diameter) is paved with 116 CCDs (including focus and tracking chips), operating in -100 degrees centigrade. The diameter of the front lens is 82 cm, the length of the lens barrel is 165 cm. The total weight is 890 kg. Every exposure includes 870 million pixels.
(c) Subaru Telescope, NAOJ
Before the HSC era, most of the cameras with large sky coverage were installed on medium or small telescopes (48-inch-a few meter telescopes), e.g. GigaPixelCamera on Pan-STARRS 1 (1.8m), MegaCam on the Canada-France-Hawaii Telescope (3.6m) and Magellan(3.6m), Dark Energy Camera on the Blanco Telescope (4m). Although they can cover a few square degrees, the sensitivity is 25% less than what you can achieve on an 8-meter class telescope. In some astrometry topics, like micro-lensing and large structure in the universe, both large aperture and FOV are vital. The enough sample will lead astrometers to a significant and compact conclusion.
(c) Subaru Telescope, NAOJ
The HSC Subaru Strategic Program (SSP) is most important and largest programs o the Subaru Telescope in this decade. This survey started in 2014, finishing at 2019. This program will survey 1400 square degrees, using optical to near-infrared filters (g, r, i, z and y), reaching a 26.5 magnitudes in stacked images. The survey regions are fixed on the equator (Dec = 0) and cross with Ecliptic plane where are the locations including a lot of solar system bodies. Hence, beside cosmology science, this survey data is quite valuable for Solar System science. Now with the HSC Survey Search, you can search for cometary activity in asteroids imaged in the HSC survey on Comet Hunters.