摘要：In Wong et al. (2019), we reported color measurements and activity constraints for the known active Centaur P/2008 CL94. At the time of our observations at Palomar Observatory on 2017 August 21, the positional uncertainty of the object reported by the JPL Horizons database was large, exceeding 100″ in R.A. at 3σ. Nevertheless, the entirety of the 3σ uncertainty ellipse was contained within the detector array. We utilized both automated moving object finding and careful visual inspection to search for the target in our images. We recovered a single moving object with a compact star-like point-spread function (PSF) that was located within the 1σ uncertainty region, and had on-sky rates in both the R.A. and decl. directions that were roughly consistent with the JPL Horizons calculations. In addition, the measured V-band apparent magnitude (20.75 ± 0.03) was a good match to the JPL Horizons prediction (20.9), and we computed a visible spectral slope that was consistent with the previously reported measurement by Kulyk et al. (2016).
