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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 5.

(Left) Absolute magnitude (H) in ZTF g, ZTF r, and ZTF i filters for 6993 from UT 2026 June 25 through 2026 September 22. The object has a visible tail during all 65 observations in this range. The stars represent observations during June 2026. From 2026 June 25 to 2026 September 22, 6993 decreases in brightness by ∼0.20 magnitudes. (Right) The same observations shown in the left figure, fit to a derived rotation period of 3.896 hr and amplitude of 0.27. We derive g − r and r − i colors of 0.64 ± 0.02 and 0.19 ± 0.02, respectively, during this activity epoch. The stars represent the observations from UT 2026 June 1 to 2026 July 31.

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