Apache Point rapid response characterization of primitive imminent impactor 2024 RW$_1$
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| Auteurs principaux: | , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866908540305670144 |
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| author | Ingebretsen, Carl Bolin, Bryce T. Jedicke, Robert Vereš, Peter Chen, Christine H. Lisse, Carey M. McMillan, Russet Sutherland, Torrie Townsend, Amanda J. |
| author_facet | Ingebretsen, Carl Bolin, Bryce T. Jedicke, Robert Vereš, Peter Chen, Christine H. Lisse, Carey M. McMillan, Russet Sutherland, Torrie Townsend, Amanda J. |
| contents | Imminent impactors may be detected only a few hours before their impact with Earth, providing a brief opportunity to characterize them before impact. We describe the characterization of imminent impactor 2024 RW$_1$, which was discovered by the Catalina Sky Survey on 2024 September 4 at 05:43 UTC, before it entered the atmosphere near the northern Philippines at 16:39 UTC. We observed 2024 RW$_1$ with the Astrophysical Research Consortium Telescope Imaging Camera on the Apache Point Astrophysical Research Consortium's 3.5-m telescope on 2024 September 4 10:16 UTC. We obtained g, r, i, and z photometry of 2024 RW$_1$, yielding color indices of g-r = 0.47$\pm$0.04, r-i = 0.13$\pm$0.04, i-z = -0.11$\pm$0.07, and g-i = 0.60$\pm$0.04, corresponding to a spectral slope of 0.67$\pm$0.40~$\%$/100 nm. The closest match to an asteroid spectral type is with B-type asteroids from the C-complex. We detect variations in the time series photometry of the asteroid with an amplitude of $\sim$0.75, and a double-peaked rotation period of $\sim$1900 s. Assuming a visible albedo of 0.07$\pm$0.03, a density of $\sim$1500 kg/m$^3$, and a calculated absolute magnitude of 30.92$\pm$0.05, we estimate that the asteroid has a diameter of 3.3$\pm$0.7 m and a total mass of $\sim$28,000 kg. Comparing our astrometric orbital solutions to NEOMOD3, the most likely source of 2024 RW$_1$ is the 3:1 main belt mean motion resonance (77\% probability) followed by the $ν_6$ resonance (13\% probability), consistent with its organic B-type nature. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_23736 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Apache Point rapid response characterization of primitive imminent impactor 2024 RW$_1$ Ingebretsen, Carl Bolin, Bryce T. Jedicke, Robert Vereš, Peter Chen, Christine H. Lisse, Carey M. McMillan, Russet Sutherland, Torrie Townsend, Amanda J. Earth and Planetary Astrophysics Instrumentation and Methods for Astrophysics Imminent impactors may be detected only a few hours before their impact with Earth, providing a brief opportunity to characterize them before impact. We describe the characterization of imminent impactor 2024 RW$_1$, which was discovered by the Catalina Sky Survey on 2024 September 4 at 05:43 UTC, before it entered the atmosphere near the northern Philippines at 16:39 UTC. We observed 2024 RW$_1$ with the Astrophysical Research Consortium Telescope Imaging Camera on the Apache Point Astrophysical Research Consortium's 3.5-m telescope on 2024 September 4 10:16 UTC. We obtained g, r, i, and z photometry of 2024 RW$_1$, yielding color indices of g-r = 0.47$\pm$0.04, r-i = 0.13$\pm$0.04, i-z = -0.11$\pm$0.07, and g-i = 0.60$\pm$0.04, corresponding to a spectral slope of 0.67$\pm$0.40~$\%$/100 nm. The closest match to an asteroid spectral type is with B-type asteroids from the C-complex. We detect variations in the time series photometry of the asteroid with an amplitude of $\sim$0.75, and a double-peaked rotation period of $\sim$1900 s. Assuming a visible albedo of 0.07$\pm$0.03, a density of $\sim$1500 kg/m$^3$, and a calculated absolute magnitude of 30.92$\pm$0.05, we estimate that the asteroid has a diameter of 3.3$\pm$0.7 m and a total mass of $\sim$28,000 kg. Comparing our astrometric orbital solutions to NEOMOD3, the most likely source of 2024 RW$_1$ is the 3:1 main belt mean motion resonance (77\% probability) followed by the $ν_6$ resonance (13\% probability), consistent with its organic B-type nature. |
| title | Apache Point rapid response characterization of primitive imminent impactor 2024 RW$_1$ |
| topic | Earth and Planetary Astrophysics Instrumentation and Methods for Astrophysics |
| url | https://arxiv.org/abs/2505.23736 |