Characterization of of (98943) 2001 CC$_{21}$, the target of Hayabusa2$\#$
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| Format: | Preprint |
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2025
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| author | Popescu, Marcel M. Tatsumi, Eri Licandro, Javier Alarcon, Miguel R. Rodríguez, Javier Rodríguez Serra-Ricart, Miquel de León, Julia Martin, Joaquín Fernandez Morate, David Simion, Gabriel N. Dumitru, Bogdan Alexandru Berteşteanu, Daniel Nicolae Prodan, George Pantelimon Hirabayashi, Masatoshi |
| author_facet | Popescu, Marcel M. Tatsumi, Eri Licandro, Javier Alarcon, Miguel R. Rodríguez, Javier Rodríguez Serra-Ricart, Miquel de León, Julia Martin, Joaquín Fernandez Morate, David Simion, Gabriel N. Dumitru, Bogdan Alexandru Berteşteanu, Daniel Nicolae Prodan, George Pantelimon Hirabayashi, Masatoshi |
| contents | The near-Earth asteroid (98943) Torifune, previously designated 2001 CC$_{21}$, is the flyby target of the Hayabusa2 extended mission, nicknamed Hayabusa2$\#$ (SHARP: Small Hazardous Asteroid Reconnaissance Probe). 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 $P~=~5.021516\pm0.000106$ h and its absolute magnitude H = 18.78 $\pm$ 0.14 and. The large number of lightcurves allows to estimate its axes ratio, its convex shape and its pole orientation $λ= 301^{\circ} \pm 35^{\circ}$, $β= {89^{+1}_{-6}}^{\circ}$ and $ε= 5^{\circ} \pm 3^{\circ}$ which indicate a prograde rotation. We report the semi-axis of the equivalent ellipsoid, $a$ = 0.42$^{+0.08}_{0.06}$ km, $b$ = 0.16$^{+0.05}_{0.04}$ km, and $c$ = $0.17\pm0.03$ km. Consequently, the volume equivalent diameter is $D_{eq}$ = $0.44 \pm 0.06$ km . Using observations conducted simultaneously with four broadband filters, we determined $(g-r) = 0.663 \pm 0.022$ mag, $(r-i) = 0.177 \pm 0.012$ mag, and $(i-z_s) = -0.061 \pm 0.032$ 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 | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_15644 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Characterization of of (98943) 2001 CC$_{21}$, the target of Hayabusa2$\#$ Popescu, Marcel M. Tatsumi, Eri Licandro, Javier Alarcon, Miguel R. Rodríguez, Javier Rodríguez Serra-Ricart, Miquel de León, Julia Martin, Joaquín Fernandez Morate, David Simion, Gabriel N. Dumitru, Bogdan Alexandru Berteşteanu, Daniel Nicolae Prodan, George Pantelimon Hirabayashi, Masatoshi Earth and Planetary Astrophysics The near-Earth asteroid (98943) Torifune, previously designated 2001 CC$_{21}$, is the flyby target of the Hayabusa2 extended mission, nicknamed Hayabusa2$\#$ (SHARP: Small Hazardous Asteroid Reconnaissance Probe). 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 $P~=~5.021516\pm0.000106$ h and its absolute magnitude H = 18.78 $\pm$ 0.14 and. The large number of lightcurves allows to estimate its axes ratio, its convex shape and its pole orientation $λ= 301^{\circ} \pm 35^{\circ}$, $β= {89^{+1}_{-6}}^{\circ}$ and $ε= 5^{\circ} \pm 3^{\circ}$ which indicate a prograde rotation. We report the semi-axis of the equivalent ellipsoid, $a$ = 0.42$^{+0.08}_{0.06}$ km, $b$ = 0.16$^{+0.05}_{0.04}$ km, and $c$ = $0.17\pm0.03$ km. Consequently, the volume equivalent diameter is $D_{eq}$ = $0.44 \pm 0.06$ km . Using observations conducted simultaneously with four broadband filters, we determined $(g-r) = 0.663 \pm 0.022$ mag, $(r-i) = 0.177 \pm 0.012$ mag, and $(i-z_s) = -0.061 \pm 0.032$ 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. |
| title | Characterization of of (98943) 2001 CC$_{21}$, the target of Hayabusa2$\#$ |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2501.15644 |