High-speed rotation of a small asteroid approaching Earth. Observation results by Tomo-e Gozen | sorae space portal site

A research group led by Hitoshi Koyama, a doctoral student in the Department of Astronomy at the University of Tokyo’s Graduate School of Science, is working on the caliber of the University of Tokyo’s Kiso observatory.105 cmSchmidt telescopemounted onWide Field and Visible Light Camcorder「Tomo Guzen」diameter using100 mlessasteroid60orb(discovered by a research group23(including celestial bodies), of which32orbrotation periodAnnounce the search results that succeeded in the assessment

In recent years, it has had a near-Earth orbit through the Comet Hunting Project.An asteroid is approaching EarthMany near-Earth objects have been discovered.Near-Earth asteroids are the closest to the sunperigee distance is1.3Less than astronomical unitsRefers to an asteroid. Japanese asteroid probe “hayabusa” and “hayabusa”2 」Asteroids “Itokawa” and “Ryugu” explored by the International Space Station are also classified as near-Earth asteroids.

Near-Earth asteroids have the advantage of being easily accessible by probes as research targets, but they may collide with Earth and cause harm to humanity.Protecting Earth from AsteroidsFrom the point of viewImportant target to watchItAccording to the research group, several minute asteroids observed this time are also located at a distance from the Earth to the Moon.3within twiceToo close to the groundIt is said that it was a bitter celestial body

Asteroids that appear to glow by reflecting sunlight appear brighter as they approach Earth.hours to daysHigh-resolution observation is only possible for a short time. Also, since many asteroids are not spherical, the region that reflects sunlight on Earth changes as it rotates.Brightness fluctuatesto do.

The search group used Tomo-e Gozen to detect asteroids that had just been discovered.Real-time video monitoringAnd I succeeded in estimating the rotation period of the asteroid by capturing the time change in brightness. In this observation, every second2Watch the frames in the video1Around20Minutes. Estimated rotation period32spiral stars13spiral stars60Fast rotation in less than a secondIt became clear that

The period of rotation of objects of small diameters, such as asteroids, is caused by solar radiation.YORP Effect“It is known to change with consideration of the effect of yup, diameter10 pmThe next rotation period for small asteroids is10

It was expected to accelerate to the sub-seconds.

* … the effect of changing the period of rotation of a celestial body due to the intensity of the heat emitted from the surface of the celestial body pushed by the sun. “YORP” comes from the initials of four pioneering researchersHowever, I discovered the spin period in this observation10Asteroids in less than a second1Celestial bodies onlyKent. The research group investigated the hypothesis that could explain the rotation period distribution obtained from the observation, which was recently proposedThe tangential yup effectIt was clarified that the observed results can be explained by (the Yoop effect taking into account the thermal conductivity along the surface of the asteroid). This is it,The rotation period of micro-asteroids cannot be less than about 10 secondsCallThere is a limit

[العلاقةبينالحجموفترةالدورانالتيتمالحصولعليهامنملاحظاتالكويكباتحتىالآنالعلاماتالحمراءهينتائجالمراقبةلهذهالدراسة،وعلاماتXالزرقاءهينتائجالمراقبةللبحثالسابقالخطالمتقطعهوالحدالأعلىلتوزيعفترةالدورانالمتوقعةللكويكباتالقريبةمنالأرضعندالنظرفيتأثيراليوبالمماسيالخطالمنقطبالشرطةهوالحدالأعلىلتوزيعفترةالدورانللكويكباتالقريبةمنالأرضالمتوقعةعندمايتماعتبارتأثيراليوبالتقليديفقط(Credit:KisoObservatory،UniversityofTokyo)】من المتوقع أن يؤدي هذا البحث إلى توضيح التطور الديناميكي لكيفية تأثر اقتراب الكويكبات من الأرض بملاحظة حالة دوران الكويكبات الدقيقة.نتائج البحث2022عام7القمر12حسب التاريخمنشورات الجمعية الفلكية اليابانية

“مجلة.بالمناسبة ، اسم جهاز المراقبة “Tomoe Gozen” هو قائدة عسكرية خدمت يوشيناكا كيسو التي ظهرت في حرب Genpei.“با يوتشيان”

سميت بعد Tomoe Gozen هو قائد عسكري خاض عالم الحرب ، لكنني آمل أن يمر Tomoe Gozen أيضًا عبر حدود علم الفلك ويحقق المزيد من النتائج.

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