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Jooyeon Geem (김주연) Project Researcher (特任研究員) RISE Project – Martian Moons eXploration (MMX) mission, Geodesy team National Astronomical Observatory of Japan (NAOJ), Mitaka, Tokyo, Japan
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Biography
Hello, I am Jooyeon Geem (김주연). I am interested in the small bodies in the solar system, especially hydrated asteroids. My main research techniques are Polarimetry and Spectroscopy. I am also developing a polarimeter (SQUIDPOL) for solar system small bodies.
* Note: Jooyeon KIM is my passport name. I use GEEM for academic activity due to the overwhelming number of people with the last name KIM.
Education & Research Careers
| Project Researcher | RISE Project (MMX mission) | National Astronomical Observatory of Japan (NAOJ), Mitaka, Tokyo, Japan | Jun. 2026 ~ Present |
|---|---|---|---|
| Post Doc. | Asteroid Engineering Laboratory, Space Systems | Luleå University of Technology, Kiruna, Sweden | Feb. 2025 ~ May 2026 |
| Post Doc. | Astronomy Program, Dept. of Physics and Astronomy | Seoul National University, Seoul, Korea | Sep. 2024 ~ Jan. 2025 |
| M.S. & Ph.D. | Astronomy Program, Dept. of Physics and Astronomy | Seoul National University, Seoul, Korea | Mar. 2018 ~ Aug. 2024 |
| Exchange | Department of Physics | University of Oslo, Oslo, Norway | Feb. 2016 ~ Jul. 2016 |
| B.S. | Department of Astronomy & Space Science | KyungHee University, Seoul, Korea | Mar. 2012 ~ Mar. 2017 |
Publications
Refereed (First Author)
SQUIDPOL: Seoul National University QUadruple Imaging Device for POLarimetry
Jin, S.†, Geem, J.†, Ishiguro, M., Park, W., Oh, H., Park, C., Choi, S., Bach, Y.P., Ju, H., Seo, J., Lim, B., Im, M.
Journal of the Korean Astronomical Society, 59, 211 (2026)
†These authors contributed equally to this work (co-first authors).
Jin, S.†, Geem, J.†, Ishiguro, M., Park, W., Oh, H., Park, C., Choi, S., Bach, Y.P., Ju, H., Seo, J., Lim, B., Im, M.
Journal of the Korean Astronomical Society, 59, 211 (2026)
†These authors contributed equally to this work (co-first authors).
Study of hydrated asteroids via their polarimetric properties at low phase angles
Geem, J., Ishiguro, M., Naito, H., Hasegawa, S., Takahashi, J., Bach, Y.P., Jin, S., Takagi, S., Ono, T., Kuroda, D., Sekiguchi, T., Kuramoto, K., Nakamura, T., Watanabe, M.
Astronomy & Astrophysics, 688, A195 (2024)
Geem, J., Ishiguro, M., Naito, H., Hasegawa, S., Takahashi, J., Bach, Y.P., Jin, S., Takagi, S., Ono, T., Kuroda, D., Sekiguchi, T., Kuramoto, K., Nakamura, T., Watanabe, M.
Astronomy & Astrophysics, 688, A195 (2024)
Spectral Type and Geometric Albedo of (98943) 2001 CC21, the Hayabusa2# Mission Target
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., Thomsen, J.S., Gray, Z.
Monthly Notices of the Royal Astronomical Society, 525, L17–L21 (2023)
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., Thomsen, J.S., Gray, Z.
Monthly Notices of the Royal Astronomical Society, 525, L17–L21 (2023)
(3200) Phaethon polarimetry in the negative branch: new evidence for the anhydrous nature of the DESTINY+ target asteroid
Geem, J., Ishiguro, M., Takahashi, J., Akitaya, H., Kawabata, K., Nakaoka, T., Imazawa, R., Mori, F., Jin, S., Bach, Y., Jo, H., Kuroda, D., Hasegawa, S., Yoshida, F., Ishibashi, K., Sekiguchi, T., Beniyama, J., Arai, T., Ikeda, Y., Shinnaka, Y., Granvik, M., et al.
Monthly Notices of the Royal Astronomical Society, 516(1), L53–L57 (2022)
Geem, J., Ishiguro, M., Takahashi, J., Akitaya, H., Kawabata, K., Nakaoka, T., Imazawa, R., Mori, F., Jin, S., Bach, Y., Jo, H., Kuroda, D., Hasegawa, S., Yoshida, F., Ishibashi, K., Sekiguchi, T., Beniyama, J., Arai, T., Ikeda, Y., Shinnaka, Y., Granvik, M., et al.
Monthly Notices of the Royal Astronomical Society, 516(1), L53–L57 (2022)
A polarimetric study of asteroids in comet-like orbits
Geem, J., Ishiguro, M., Bach, Y., Kuroda, D., Naito, H., Hanayama, H., Kim, Y., Kwon, Y., Jin, S., Sekiguchi, T., Okazaki, R., Vaubaillon, J., Imai, M., Oono, T., Futamura, Y., Takagi, S., Sato, M., Kuramoto, K., & Watanabe, M.
Astronomy & Astrophysics, 658, A158 (2022)
Geem, J., Ishiguro, M., Bach, Y., Kuroda, D., Naito, H., Hanayama, H., Kim, Y., Kwon, Y., Jin, S., Sekiguchi, T., Okazaki, R., Vaubaillon, J., Imai, M., Oono, T., Futamura, Y., Takagi, S., Sato, M., Kuramoto, K., & Watanabe, M.
Astronomy & Astrophysics, 658, A158 (2022)
Refereed (Co-Author)
Lim, B., Ishiguro, M., Takahashi, J., Akitaya, H., Geem, J., Bach, Y.P., Jin, S., Jo, H., Choi, S., Seo, J., Kawabata, K.S., Hori, T., Maruta, T., & Im, M. (2025).
Optical and near-infrared contemporaneous polarimetry of C/2023 A3 (Tsuchinshan-ATLAS).
The Astronomical Journal, 983, 1, L19.
Bourdelle de Micas, J., Perna, D., Fornasier, S., Dotto, E., Ieva, S., Barucci, M.A., Geem, J., Hasegawa, S., Ishiguro, M., Kitazato, K., Kuroda, D., Mazzotta Epifani, E., Palomba, E., Yoshikawa, M., & Hirabayashi, M. (2025).
Spectral and photometric characterization of (98943) Torifune in preparation for the Hayabusa2# spacecraft flyby.
Astronomy & Astrophysics, 693, L19.
Jin, S., Ishiguro, M., Geem, J., Naito, H., Takahashi, J., Akitaya, H., Kuroda, D., Urakawa, S., Takagi, S., Oono, T., Sekiguchi, T., Perna, D., Ieva, S., Bach, Y.P., Imazawa, R., Kawabata, K.S., Watanabe, M., & Jo, H. (2024).
New evidence supporting past dust ejections from active asteroid (4015) Wilson-Harrington.
Astronomy & Astrophysics, 690, A193.
Hasegawa, S., Marsset, M., DeMeo, F.E., Hanuš, J., Binzel, R.P., Bus, S.J., Burt, B., Polishook, D., Thomas, C.A., Geem, J., Ishiguro, M., Kuroda, D., & Vernazza, P. (2024).
Candidate Main-belt Asteroids for Surface Heterogeneity.
The Astronomical Journal, 167(5), 224.
Bach, Y., Ishiguro, M., Takahashi, J., Geem, J., Kuroda, D., Naito, H., Kwon, J. (2024).
Quantitative grain size estimation on airless bodies from the negative polarization branch. II. Dawn mission targets (4) Vesta and (1) Ceres.
Astronomy & Astrophysics, 684, A81.
Bach, Y., Ishiguro, M., Takahashi, J., Geem, J., Kuroda, D., Naito, H., Kwon, J. (2024).
Quantitative grain size estimation on airless bodies from the negative polarization branch. I. Insights from experiments and lunar observations.
Astronomy & Astrophysics, 684, A80.
Kang, J., Chae, J., Geem, J. (2024).
A Statistical Analysis of Spiral-shaped Wave Patterns in Sunspot Umbrae.
The Astronomical Journal, 960, 115.
Beniyama, J., Sekiguchi, T., Kuroda, D., Arai, T., Ishibashi, K., Ishiguro, M., Yoshida, F., Senshu, H., Ootsubo, T., Sako, S., Ohsawa, R., Takita, S., Geem, J., & Bach, Y. (2023).
Simultaneous multicolor photometry of the DESTINY+ target asteroid (3200) Phaethon.
Publications of the Astronomical Society of Japan, 75(2), 297–310.
Ishiguro, M., Bach, Y., Geem, J., Naito, H., Kuroda, D., Im, M., Lee, M., Seo, J., Jin, S., Kwon, Y., Oono, T., Takagi, S., Sato, M., Kuramoto, K., Ito, T., Hasegawa, S., Yoshida, F., Arai, T., Akitaya, H., Sekiguchi, T., Okazaki, R., Imai, M., Ohtsuka, K., Watanabe, M., Takahashi, J., Devogele, M., Fedorets, G., Siltala, L., & Granvik, M. (2022).
Polarimetric properties of the near-Sun asteroid (155140) 2005 UD in comparison with other asteroids and meteoritic samples.
Monthly Notices of the Royal Astronomical Society, 509(3), 4128–4142.
Hasegawa, S., DeMeo, F., Marsset, M., Hanuš, J., Avdellidou, C., Delbo, M., Bus, S., Hanayama, H., Horiuchi, T., Takir, D., Jehin, E., Ferrais, M., Geem, J., Im, M., Seo, J., Bach, Y., Jin, S., Ishiguro, M., Kuroda, D., Binzel, R., Nakamura, A., Yang, B., & Vernazza, P. (2022).
Spectral Evolution of Dark Asteroid Surfaces Induced by Space Weathering over a Decade.
The Astronomical Journal, 939(1), L9.
Bach, Y., Ishiguro, M., Takahashi, J., & Geem, J. (2022).
Data Reduction Process and Pipeline for the NIC Polarimetry Mode in Python, NICpolpy.
Stars and Galaxies, 5, 4.
Hasegawa, S., Marsset, M., DeMeo, F., Bus, S., Geem, J., Ishiguro, M., Im, M., Kuroda, D., & Vernazza, P. (2021).
Discovery of Two TNO-like Bodies in the Asteroid Belt.
The Astrophysical Journal, 916(1), L6.
Kuroda, D., Geem, J., Akitaya, H., Jin, S., Takahashi, J., Takahashi, K., Naito, H., Makino, K., Sekiguchi, T., Bach, Y., Seo, J., Sato, S., Sasago, H., Kawabata, K., Kawakami, A., Tozuka, M., Watanabe, M., Takagi, S., Kuramoto, K., Yoshikawa, M., Hasegawa, S., & Ishiguro, M. (2021).
Implications of High Polarization Degree for the Surface State of Ryugu.
The Astrophysical Journal, 911(2), L24.
Ishiguro, M., Kuroda, D., Watanabe, M., Bach, Y., Geem, J., Lee, M., Sekiguchi, T., Naito, H., Ohtsuka, K., Hanayama, H., Hasegawa, S., Usui, F., Urakawa, S., Imai, M., Sato, M., & Kuramoto, K. (2017).
Polarimetric Study of Near-Earth Asteroid (1566) Icarus.
The Astronomical Journal, 154(5), 180.