Fig. 2 from A Photometricity and Extinction Monitor at the Apache Point Observatory

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A Photometricity and Extinction Monitor at the Apache Point Observatory

Authors: David W. Hogg, Douglas P. Finkbeiner, David J. Schlegel, and James E. Gunn

Hogg et al. 2001 The Astronomical Journal 122 2129.

Provider: AAS Journals

Caption: Fig. 2.

Two example cloud‐camera images, taken at 05:24 UT on MJD 51997 (top), and at 05:45 UT on MJD 51997 (bottom). The images are displayed at the same stretch and are negatives (bright areas appear dark). The dark silhouettes around the edge are buildings and trees near the camera; the APO 3.5 m telescope is visible at upper left.

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