Spectral type and geometric albedo of (98943) 2001 CC21, the Hayabusa2# mission target

TAKAGI Seiko

Department of Earth and Planetary Sciences

Jul. 20, 2023

（左）北海道大学1.6メートルピリカ望遠鏡 （右）小惑星のタイプと偏光特性の比較。小惑星2001 CC21は、小惑星イトカワと同じS型小惑星の偏光特性を持つことが分かる。

Press release (in Japanese)

Abstract
We conducted optical polarimetry and near-infrared spectroscopy of Japan Aerospace Exploration Agency (JAXA)’s Hayabusa2# mission target, (98943) 2001 CC₂₁, in early 2023. Our new observations indicate that this asteroid has a polarimetric inversion angle of ∼20°, absorption bands around 0.9 and 1.9 μm, and a geometric albedo of 0.23 ± 0.04. All these features are consistent with those of S types but inconsistent with L types. Based on this evidence, we conclude that….. 

Read the full article on Monthly Notices of the Royal Astronomical Society Letters

Article Information:
Spectral type and geometric albedo of (98943) 2001 CC21, the Hayabusa2# mission target
Jooyeon Geem, Masateru Ishiguro, Mikael Granvik, Hiroyuki Naito, Hiroshi Akitaya, Tomohiko Sekiguchi, Sunao Hasegawa, Daisuke Kuroda, Tatsuharu Oono, Yoonsoo P Bach, Sunho Jin, Ryo Imazawa, Koji S Kawabata, Seiko Takagi, Makoto Yoshikawa, Anlaug A Djupvik, Julie Thiim Gadeberg, Tapio Pursimo, Oliver Durfeldt Pedros, Jeppe Sinkbaek Thomsen, Zuri Gray
Monthly Notices of the Royal Astronomical Society: Letters, Volume 525, Issue 1, October 2023, Pages L17–L21, 
DOI: 10.1093/mnrasl/slad073