Ground-based Characterization of (98943) Torifune 2001 CC21, the Target of the Hayabusa2# Space Mission
The near-Earth asteroid (98943) Torifune, previously designated 2001 CC _21 , is the flyby target of the Hayabusa2 extended mission, nicknamed Hayabusa2 # (Small Hazardous Asteroid Reconnaissance Probe (SHARP)). The ground-based telescope observations offer a key science input for the mission's...
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2025-01-01
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| author | Marcel M. Popescu Eri Tatsumi Javier Licandro Miguel R. Alarcon Javier Rodríguez Rodríguez Miquel Serra-Ricart Julia de León Joaquín Fernandez Martin David Morate Gabriel N. Simion Bogdan Alexandru Dumitru Daniel Nicolae Berteşteanu George Pantelimon Prodan Masatoshi Hirabayashi |
| author_facet | Marcel M. Popescu Eri Tatsumi Javier Licandro Miguel R. Alarcon Javier Rodríguez Rodríguez Miquel Serra-Ricart Julia de León Joaquín Fernandez Martin David Morate Gabriel N. Simion Bogdan Alexandru Dumitru Daniel Nicolae Berteşteanu George Pantelimon Prodan Masatoshi Hirabayashi |
| author_sort | Marcel M. Popescu |
| collection | DOAJ |
| description | The near-Earth asteroid (98943) Torifune, previously designated 2001 CC _21 , is the flyby target of the Hayabusa2 extended mission, nicknamed Hayabusa2 # (Small Hazardous Asteroid Reconnaissance Probe (SHARP)). The ground-based telescope observations offer a key science input for the mission's scientific investigation. During 2022–2024, this asteroid was at visible apparent magnitudes brighter than 18.5, allowing for a detailed characterization using ground-based telescope observations. We determined its rotation period P = 5.021516 ± 0.000106 hr and its absolute magnitude H = 18.78 ± 0.14. The large number of light curves allows us to estimate its axis ratio, its convex shape, and its pole orientation, λ = 301 ^∘ ± 35 ^∘ , $\beta =8{9}_{-6}^{+1^\circ }$ , and ϵ = 5 ^∘ ± 3 ^∘ , respectively, which indicate a prograde rotation. We report the semiaxis of the equivalent ellipsoid, a = 0.42 ${}_{0.06}^{+0.08}$ km, b = 0.16 ${}_{0.04}^{+0.05}$ km, and c = 0.17 ± 0.03 km. Consequently, the volume-equivalent diameter is D _eq = 0.44 ± 0.06 km. Using observations conducted simultaneously with four broadband filters, we determined ( g − r ) = 0.663 ± 0.022 mag, ( r − i ) = 0.177 ± 0.012 mag, and ( i − z _s ) = −0.061 ± 0.032 mag. Additionally, we found that Torifune exhibits no detectable large-scale heterogeneity. We classified the object using a high signal-to-noise ratio spectrum (over the visible and near-infrared region) as Sq-type in the Bus–DeMeo taxonomy. We estimate a mineralogy similar to LL/L ordinary chondrites, with an ol/(ol+px) = 0.60, a Fa content of 28.5 mol%, and a Fs content of 23.4 mol%. The spectral data indicate a surface affected by moderate space weathering effects. |
| format | Article |
| id | doaj-art-470fb6c3fbf9466286fd6c832ff6891a |
| institution | Kabale University |
| issn | 2632-3338 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
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| spelling | doaj-art-470fb6c3fbf9466286fd6c832ff6891a2025-02-07T08:12:01ZengIOP PublishingThe Planetary Science Journal2632-33382025-01-01624210.3847/PSJ/ada560Ground-based Characterization of (98943) Torifune 2001 CC21, the Target of the Hayabusa2# Space MissionMarcel M. Popescu0https://orcid.org/0000-0001-8585-204XEri Tatsumi1https://orcid.org/0000-0002-6142-9842Javier Licandro2https://orcid.org/0000-0002-9214-337XMiguel R. Alarcon3https://orcid.org/0000-0002-8134-2592Javier Rodríguez Rodríguez4https://orcid.org/0000-0002-2718-2022Miquel Serra-Ricart5https://orcid.org/0000-0002-2394-0711Julia de León6https://orcid.org/0000-0002-0696-0411Joaquín Fernandez Martin7David Morate8Gabriel N. Simion9Bogdan Alexandru Dumitru10https://orcid.org/0000-0003-3166-5139Daniel Nicolae Berteşteanu11George Pantelimon Prodan12Masatoshi Hirabayashi13https://orcid.org/0000-0002-1821-5689University of Craiova , Str. A. I. Cuza nr. 13, 200585 Craiova, Romania ; [email protected]; Astronomical Institute of the Romanian Academy , 5 Cuţitul de Argint, 040557 Bucharest, RomaniaInstitute of Space and Astronautical Science (ISAS) , Japan Aerospace Exploration Agency (JAXA), Sagamihara, 252-5210 Kanagawa, Japan ; [email protected] de Astrofísica de Canarias (IAC) , C/Vía Láctea s/n, 38205 La Laguna, Tenerife, Spain; Departamento de Astrofísica, Universidad de La Laguna , 38206 La Laguna, Tenerife, SpainInstituto de Astrofísica de Canarias (IAC) , C/Vía Láctea s/n, 38205 La Laguna, Tenerife, Spain; Departamento de Astrofísica, Universidad de La Laguna , 38206 La Laguna, Tenerife, SpainInstituto Universitario de Ciencias y Tecnologías Espaciales de Asturias (ICTEA), University of Oviedo , C. Independencia 13, E-33004 Oviedo, SpainInstituto de Astrofísica de Canarias (IAC) , C/Vía Láctea s/n, 38205 La Laguna, Tenerife, Spain; Departamento de Astrofísica, Universidad de La Laguna , 38206 La Laguna, Tenerife, Spain; Light Bridges S. L. , Observatorio del Teide, Carretera del Observatorio S/N, E-38500 Guimar, Tenerife, Canarias, SpainInstituto de Astrofísica de Canarias (IAC) , C/Vía Láctea s/n, 38205 La Laguna, Tenerife, Spain; Departamento de Astrofísica, Universidad de La Laguna , 38206 La Laguna, Tenerife, SpainAstronomical Institute of the Romanian Academy , 5 Cuţitul de Argint, 040557 Bucharest, Romania; Instituto de Astrofísica de Canarias (IAC) , C/Vía Láctea s/n, 38205 La Laguna, Tenerife, SpainCentro de Estudios de Física del Cosmos de Aragøn (CEFCA) , Unidad Asociada al CSIC, Plaza San Juan 1, 44001, SpainAstronomical Institute of the Romanian Academy , 5 Cuţitul de Argint, 040557 Bucharest, RomaniaInstitute of Space Science (ISS) , 409, Atomiştilor Street, 077125 Măgurele, Ilfov, RomaniaAstronomical Institute of the Romanian Academy , 5 Cuţitul de Argint, 040557 Bucharest, Romania; Astroclubul Bucureşti , Blvd Lascăr Catargiu 21, 10663 Bucharest, RomaniaUniversity of Craiova , Str. A. I. Cuza nr. 13, 200585 Craiova, Romania ; [email protected]; Astronomical Institute of the Romanian Academy , 5 Cuţitul de Argint, 040557 Bucharest, RomaniaGeorgia Institute of Technology , Atlanta, GA 30320, USAThe near-Earth asteroid (98943) Torifune, previously designated 2001 CC _21 , is the flyby target of the Hayabusa2 extended mission, nicknamed Hayabusa2 # (Small Hazardous Asteroid Reconnaissance Probe (SHARP)). The ground-based telescope observations offer a key science input for the mission's scientific investigation. During 2022–2024, this asteroid was at visible apparent magnitudes brighter than 18.5, allowing for a detailed characterization using ground-based telescope observations. We determined its rotation period P = 5.021516 ± 0.000106 hr and its absolute magnitude H = 18.78 ± 0.14. The large number of light curves allows us to estimate its axis ratio, its convex shape, and its pole orientation, λ = 301 ^∘ ± 35 ^∘ , $\beta =8{9}_{-6}^{+1^\circ }$ , and ϵ = 5 ^∘ ± 3 ^∘ , respectively, which indicate a prograde rotation. We report the semiaxis of the equivalent ellipsoid, a = 0.42 ${}_{0.06}^{+0.08}$ km, b = 0.16 ${}_{0.04}^{+0.05}$ km, and c = 0.17 ± 0.03 km. Consequently, the volume-equivalent diameter is D _eq = 0.44 ± 0.06 km. Using observations conducted simultaneously with four broadband filters, we determined ( g − r ) = 0.663 ± 0.022 mag, ( r − i ) = 0.177 ± 0.012 mag, and ( i − z _s ) = −0.061 ± 0.032 mag. Additionally, we found that Torifune exhibits no detectable large-scale heterogeneity. We classified the object using a high signal-to-noise ratio spectrum (over the visible and near-infrared region) as Sq-type in the Bus–DeMeo taxonomy. We estimate a mineralogy similar to LL/L ordinary chondrites, with an ol/(ol+px) = 0.60, a Fa content of 28.5 mol%, and a Fs content of 23.4 mol%. The spectral data indicate a surface affected by moderate space weathering effects.https://doi.org/10.3847/PSJ/ada560Near-Earth objectsObservational astronomyAsteroid rotationSpectroscopySpectrophotometry |
| spellingShingle | Marcel M. Popescu Eri Tatsumi Javier Licandro Miguel R. Alarcon Javier Rodríguez Rodríguez Miquel Serra-Ricart Julia de León Joaquín Fernandez Martin David Morate Gabriel N. Simion Bogdan Alexandru Dumitru Daniel Nicolae Berteşteanu George Pantelimon Prodan Masatoshi Hirabayashi Ground-based Characterization of (98943) Torifune 2001 CC21, the Target of the Hayabusa2# Space Mission The Planetary Science Journal Near-Earth objects Observational astronomy Asteroid rotation Spectroscopy Spectrophotometry |
| title | Ground-based Characterization of (98943) Torifune 2001 CC21, the Target of the Hayabusa2# Space Mission |
| title_full | Ground-based Characterization of (98943) Torifune 2001 CC21, the Target of the Hayabusa2# Space Mission |
| title_fullStr | Ground-based Characterization of (98943) Torifune 2001 CC21, the Target of the Hayabusa2# Space Mission |
| title_full_unstemmed | Ground-based Characterization of (98943) Torifune 2001 CC21, the Target of the Hayabusa2# Space Mission |
| title_short | Ground-based Characterization of (98943) Torifune 2001 CC21, the Target of the Hayabusa2# Space Mission |
| title_sort | ground based characterization of 98943 torifune 2001 cc21 the target of the hayabusa2 space mission |
| topic | Near-Earth objects Observational astronomy Asteroid rotation Spectroscopy Spectrophotometry |
| url | https://doi.org/10.3847/PSJ/ada560 |
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