Apache Point rapid response characterization of primitive pre-impact detection asteroid 2024 RW1OPEN ACCESS 

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Carl Ingebretsen, Bryce T. Bolin, Robert Jedicke, Peter Vereš, Christine H. Chen, Carey M. Lisse, Russet McMillan, Torrie Sutherland, Amanda J. Townsend

submitted to ApJL
PDF (OPEN ACCESS)

“Pre-impact detection asteroids (PIDAs) 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 PIDA 2024 RW1, 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 RW1 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 RW1, yielding color indices of g-r = 0.47±0.04, r-i = 0.13±0.04, i-z = -0.11±0.07, and g-i = 0.60±0.04, corresponding to a spectral slope of 0.67±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 ~0.75, and a double-peaked rotation period of ~1900 s. Assuming a visible albedo of 0.07 and a density of ~1500 kg/m^3, and using the derived absolute magnitude of 32.2±0.5, we calculate that the asteroid has a diameter of 1.8±0.4 m and a total mass of ~5000 kg. The most likely source of 2024 RW1 is the 3:1 mean motion resonance followed by the ν6 resonance, according to NEOMOD3.”

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