OASES (Organized Auto-telescopes for Serendipitous Event Survey)

location of telescopes: Miyako island ( 宮古島)

scaled flux

Takahashi EM-200 Equatorial Mount
Celestron RASA C11 inch
ZWO ASI1600MM-Cool
Metabones Speed Booster
Laptop computer and SSD
GPS receiver

calibrated image and difference image

signal-to-noise ratios

time offset:

In the summer of 2016 to 2017, the research group installed a system on the roof of the "Okinawa prefectural Miyako youth house" in Miyakojima City, Okinawa Prefecture, and is about 4 square degrees (about 20 full moons) 2000 stars were observed for 60 hours. The telescope is located in the Milky Way where there are a large number of stars that can be observed at one time and is located near the ecliptic where the number of the Kuiper belt objects is large (that is, it is predicted that the occultation phenomenon is likely to occur) It was.

Examination of the obtained moving image data revealed that the 12th grade star in the field of view had dimmed up to about 80% for about 0.2 seconds. More detailed analysis showed that this change in brightness can be explained by occultation by the Kuiper belt astronomical body of about 1.3 km radius about 5 billion km away from the Earth.

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