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

doi:10.1093/mnrasl/slad073

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

^*Corresponding author for this work

Department of Space Research and Technology

Seoul National University
Luleå University of Technology
Hiroshima University
Hokkaido University of Education
JAXA Institute of Space and Astronautical Science
Hokkaido University
University of Bologna
University College London
Nayoro Observatory
Bisei Space Guard Center
Aarhus University
Nordic Optical Telescope

Research output: Contribution to journal › Journal article › Research › peer-review

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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 JAXA's Hayabusa2# spacecraft will explore an S-type asteroid (more specifically, an L or LL chondrite-like object) with albedo and size (0.44-0.53 km when we assume the absolute magnitude of 18.8) similar to (25143) Itokawa.

Original language	English
Journal	Monthly Notices of the Royal Astronomical Society: Letters
Volume	525
Issue number	1
Pages (from-to)	L17-L21
ISSN	1745-3925
DOIs	https://doi.org/10.1093/mnrasl/slad073
Publication status	Published - 2023

Keywords

Minor planets, asteroids: individual: (98943) 2001 CC
Techniques: polarimetric
Techniques: spectroscopic

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10.1093/mnrasl/slad073

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Geem, J., Ishiguro, M., Granvik, M., Naito, H., Akitaya, H., Sekiguchi, T., Hasegawa, S., Kuroda, D., Oono, T., Bach, Y. P., Jin, S., Imazawa, R., Kawabata, K. S., Takagi, S., Yoshikawa, M., Djupvik, A. A., Gadeberg, J. T., Pursimo, T., Pedros, O. D., ... Gray, Z. (2023). Spectral type and geometric albedo of (98943) 2001 CC₂₁, the Hayabusa2# mission target. Monthly Notices of the Royal Astronomical Society: Letters, 525(1), L17-L21. https://doi.org/10.1093/mnrasl/slad073

@article{313ebdce24b949869dde3df4c5be5b5b,

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

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 JAXA's Hayabusa2\# spacecraft will explore an S-type asteroid (more specifically, an L or LL chondrite-like object) with albedo and size (0.44-0.53 km when we assume the absolute magnitude of 18.8) similar to (25143) Itokawa.",

keywords = "Minor planets, asteroids: individual: (98943) 2001 CC, Techniques: polarimetric, Techniques: spectroscopic",

author = "Jooyeon Geem and Masateru Ishiguro and Mikael Granvik and Hiroyuki Naito and Hiroshi Akitaya and Tomohiko Sekiguchi and Sunao Hasegawa and Daisuke Kuroda and Tatsuharu Oono and Bach, \{Yoonsoo P.\} and Sunho Jin and Ryo Imazawa and Kawabata, \{Koji S.\} and Seiko Takagi and Makoto Yoshikawa and Djupvik, \{Anlaug A.\} and Gadeberg, \{Julie Thiim\} and Tapio Pursimo and Pedros, \{Oliver Durfeldt\} and Thomsen, \{Jeppe Sinkbaek\} and Zuri Gray",

note = "Publisher Copyright: {\textcopyright} 2023 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.",

year = "2023",

doi = "10.1093/mnrasl/slad073",

language = "English",

volume = "525",

pages = "L17--L21",

journal = "Monthly Notices of the Royal Astronomical Society: Letters",

issn = "1745-3925",

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Geem, J, Ishiguro, M, Granvik, M, Naito, H, Akitaya, H, Sekiguchi, T, Hasegawa, S, Kuroda, D, Oono, T, Bach, YP, Jin, S, Imazawa, R, Kawabata, KS, Takagi, S, Yoshikawa, M, Djupvik, AA, Gadeberg, JT, Pursimo, T, Pedros, OD, Thomsen, JS & Gray, Z 2023, 'Spectral type and geometric albedo of (98943) 2001 CC₂₁, the Hayabusa2# mission target', Monthly Notices of the Royal Astronomical Society: Letters, vol. 525, no. 1, pp. L17-L21. https://doi.org/10.1093/mnrasl/slad073

TY - JOUR

T1 - Spectral type and geometric albedo of (98943) 2001 CC21, the Hayabusa2# mission target

AU - Geem, Jooyeon

AU - Ishiguro, Masateru

AU - Granvik, Mikael

AU - Naito, Hiroyuki

AU - Akitaya, Hiroshi

AU - Sekiguchi, Tomohiko

AU - Hasegawa, Sunao

AU - Kuroda, Daisuke

AU - Oono, Tatsuharu

AU - Bach, Yoonsoo P.

AU - Jin, Sunho

AU - Imazawa, Ryo

AU - Kawabata, Koji S.

AU - Takagi, Seiko

AU - Yoshikawa, Makoto

AU - Djupvik, Anlaug A.

AU - Gadeberg, Julie Thiim

AU - Pursimo, Tapio

AU - Pedros, Oliver Durfeldt

AU - Thomsen, Jeppe Sinkbaek

AU - Gray, Zuri

PY - 2023

Y1 - 2023

N2 - 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 JAXA's Hayabusa2# spacecraft will explore an S-type asteroid (more specifically, an L or LL chondrite-like object) with albedo and size (0.44-0.53 km when we assume the absolute magnitude of 18.8) similar to (25143) Itokawa.

AB - 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 JAXA's Hayabusa2# spacecraft will explore an S-type asteroid (more specifically, an L or LL chondrite-like object) with albedo and size (0.44-0.53 km when we assume the absolute magnitude of 18.8) similar to (25143) Itokawa.

KW - Minor planets, asteroids: individual: (98943) 2001 CC

KW - Techniques: polarimetric

KW - Techniques: spectroscopic

U2 - 10.1093/mnrasl/slad073

DO - 10.1093/mnrasl/slad073

M3 - Journal article

AN - SCOPUS:85165416016

SN - 1745-3925

VL - 525

SP - L17-L21

JO - Monthly Notices of the Royal Astronomical Society: Letters

JF - Monthly Notices of the Royal Astronomical Society: Letters

IS - 1

ER -