Kōichi Itagaki

is an amateur astronomer based in Yamagata, the capital city of Yamagata Prefecture in the Tōhoku region of northern Honshu island, Japan. He is responsible for discovering many comets, and over 170 supernovae. Provided by Wikipedia
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  1. 1
    From Discovery to the First Month of the Type II Supernova 2023ixf: High and Variable Mass Loss in the Final Year before Explosion

    From Discovery to the First Month of the Type II Supernova 2023ixf: High and Variable Mass Loss in the Final Year before Explosion by Daichi Hiramatsu, Daichi Tsuna, Edo Berger, Koichi Itagaki, Jared A. Goldberg, Sebastian Gomez, Kishalay De, Griffin Hosseinzadeh, K. Azalee Bostroem, Peter J. Brown, Iair Arcavi, Allyson Bieryla, Peter K. Blanchard, Gilbert A. Esquerdo, Joseph Farah, D. Andrew Howell, Tatsuya Matsumoto, Curtis McCully, Megan Newsome, Estefania Padilla Gonzalez, Craig Pellegrino, Jaehyon Rhee, Giacomo Terreran, József Vinkó, J. Craig Wheeler

    Published 2023-01-01
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  2. 2
    SN2023fyq: A Type Ibn Supernova with Long-standing Precursor Activity Due to Binary Interaction

    SN2023fyq: A Type Ibn Supernova with Long-standing Precursor Activity Due to Binary Interaction by Yize Dong, Daichi Tsuna, Stefano Valenti, David J. Sand, Jennifer E. Andrews, K. Azalee Bostroem, Griffin Hosseinzadeh, Emily Hoang, Saurabh W. Jha, Daryl Janzen, Jacob E. Jencson, Michael Lundquist, Darshana Mehta, Aravind P. Ravi, Nicolas E. Meza Retamal, Jeniveve Pearson, Manisha Shrestha, Alceste Z. Bonanos, D. Andrew Howell, Nathan Smith, Joseph Farah, Daichi Hiramatsu, Koichi Itagaki, Curtis McCully, Megan Newsome, Estefania Padilla Gonzalez, Emmanouela Paraskeva, Craig Pellegrino, Giacomo Terreran, Joshua Haislip, Vladimir Kouprianov, Daniel E. Reichart

    Published 2024-01-01
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  3. 3
    Evidence of Weak Circumstellar Medium Interaction in the Type II SN 2023axu

    Evidence of Weak Circumstellar Medium Interaction in the Type II SN 2023axu by Manisha Shrestha, Jeniveve Pearson, Samuel Wyatt, David J. Sand, Griffin Hosseinzadeh, K. Azalee Bostroem, Jennifer E. Andrews, Yize Dong, Emily Hoang, Daryl Janzen, Jacob E. Jencson, Michael Lundquist, Darshana Mehta, Nicolás Meza Retamal, Stefano Valenti, Jillian C. Rastinejad, Phil Daly, Dallan Porter, Joannah Hinz, Skyler Self, Benjamin Weiner, G. Grant Williams, Daichi Hiramatsu, D. Andrew Howell, Curtis McCully, Estefania Padilla Gonzalez, Craig Pellegrino, Giacomo Terreran, Megan Newsome, Joseph Farah, Koichi Itagaki, Saurabh W. Jha, Lindsey Kwok, Nathan Smith, Michaela Schwab, Jeonghee Rho, Yi Yang

    Published 2024-01-01
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  4. 4
    The Early Light Curve of SN 2023bee: Constraining Type Ia Supernova Progenitors the Apian Way

    The Early Light Curve of SN 2023bee: Constraining Type Ia Supernova Progenitors the Apian Way by Griffin Hosseinzadeh, David J. Sand, Sumit K. Sarbadhicary, Stuart D. Ryder, Saurabh W. Jha, Yize Dong, K. Azalee Bostroem, Jennifer E. Andrews, Emily Hoang, Daryl Janzen, Jacob E. Jencson, Michael Lundquist, Nicolas E. Meza Retamal, Jeniveve Pearson, Manisha Shrestha, Stefano Valenti, Samuel Wyatt, Joseph Farah, D. Andrew Howell, Curtis McCully, Megan Newsome, Estefania Padilla Gonzalez, Craig Pellegrino, Giacomo Terreran, Muzoun Alzaabi, Elizabeth M. Green, Jessica L. Gurney, Peter A. Milne, Kaycee I. Ridenhour, Nathan Smith, Paulina Soto Robles, Lindsey A. Kwok, Michaela Schwab, Mariusz Gromadzki, David A. H. Buckley, Koichi Itagaki, Daichi Hiramatsu, Laura Chomiuk, Peter Lundqvist, Joshua Haislip, Vladimir Kouprianov, Daniel E. Reichart

    Published 2023-01-01
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