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Discovery of Activity on Main-belt Asteroid 6993 (1995 BJ4)

  • Authors: Erin M. Clark, David E. Trilling, Revanth Munugala, Michael S.P. Kelley, Henry Hsieh, Michael Gowanlock, Andrew McNeill, Savannah Chappus, Maria Chernyavskaya, Graceson Mule, Gunnar Johnson, Daniel Kramer

Erin M. Clark et al 2026 The Astrophysical Journal Letters 1011 .

  • Provider: AAS Journals

Caption: Figure 4.

(Left) Lomb–Scargle power as a function of frequency of the light-curve solution, shown in inverse days, for observations from UT 2019 May 4 to 2025 July 20. The power peaks at a light-curve period of 0.0812 days, which is equivalent to a rotation period (which is twice the light-curve period) of 3.897 hr. (Right) Photometric data for 6993 phased to the rotation period of 3.897 hr and amplitude of 0.29 mag. Observations in the ZTF g (green), ZTF r (red), and ZTF i (purple) are corrected to the ZTF r filter in order to derive g − r and r − i colors of 0.57 ± 0.04 and 0.28 ± 0.03, respectively.

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