Video observations of tiny near-Earth objects with Tomo-e Gozen. (12th July 2022)
- Record Type:
- Journal Article
- Title:
- Video observations of tiny near-Earth objects with Tomo-e Gozen. (12th July 2022)
- Main Title:
- Video observations of tiny near-Earth objects with Tomo-e Gozen
- Authors:
- Beniyama, Jin
Sako, Shigeyuki
Ohsawa, Ryou
Takita, Satoshi
Kobayashi, Naoto
Okumura, Shin-ichiro
Urakawa, Seitaro
Yoshikawa, Makoto
Usui, Fumihiko
Yoshida, Fumi
Doi, Mamoru
Niino, Yuu
Shigeyama, Toshikazu
Tanaka, Masaomi
Tominaga, Nozomu
Aoki, Tsutomu
Arima, Noriaki
Arimatsu, Ko
Kasuga, Toshihiro
Kondo, Sohei
Mori, Yuki
Takahashi, Hidenori
Watanabe, Jun-ichi - Abstract:
- Abstract: We report the results of video observations of tiny (diameter less than 100 m) near-Earth objects (NEOs) with Tomo-e Gozen on the Kiso 105 cm Schmidt telescope. The rotational period of a tiny asteroid reflects its dynamical history and physical properties since smaller objects are sensitive to the Yarkovsky–O'Keefe–Radzievskii–Paddack (YORP) effect. We carried out video observations of 60 tiny NEOs at 2 fps from 2018 to 2021 and successfully derived the rotational periods and axial ratios of 32 NEOs including 13 fast rotators with rotational periods less than 60 s. The fastest rotator found during our survey is 2020 HS$_\mathsf {7}$ with a rotational period of 2.99 s. We statistically confirmed that there is a certain number of tiny fast rotators in the NEO population, which have been missed with all previous surveys. We have discovered that the distribution of the tiny NEOs in a diameter and rotational period (D–P) diagram is truncated around a period of 10 s. The truncation with a flat-top shape is not explained well by either a realistic tensile strength of NEOs or the suppression of YORP by meteoroid impacts. We propose that the dependence of the tangential YORP effect on the rotational period potentially explains the observed pattern in the D–P diagram.
- Is Part Of:
- Publications of the Astronomical Society of Japan. Volume 74:Number 4(2022)
- Journal:
- Publications of the Astronomical Society of Japan
- Issue:
- Volume 74:Number 4(2022)
- Issue Display:
- Volume 74, Issue 4 (2022)
- Year:
- 2022
- Volume:
- 74
- Issue:
- 4
- Issue Sort Value:
- 2022-0074-0004-0000
- Page Start:
- 877
- Page End:
- 903
- Publication Date:
- 2022-07-12
- Subjects:
- methods: observational -- minor planets, asteroids: general -- techniques: photometric
Astronomy -- Periodicals
520.5 - Journal URLs:
- http://pasj.asj.or.jp/ ↗
http://pasj.oxfordjournals.org/ ↗
http://www.oxfordjournals.org/ ↗ - DOI:
- 10.1093/pasj/psac043 ↗
- Languages:
- English
- ISSNs:
- 0004-6264
- Deposit Type:
- Legaldeposit
- View Content:
- Available online (eLD content is only available in our Reading Rooms) ↗
- Physical Locations:
- British Library DSC - 7029.000000
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