Relative brightness of some comet SL9 fragments (July 12, 1994) -------------------------------------------------------------- Olivier Hainaut and Richard West European Southern Observatory July 12, 1994, 12:00 UT The relative brightness of cometary fragments A - L and P has been measured on a 15 min, 2000 x 2000 pix CCD exposure, obtained through a standard R filter with the EMMI instrument at the ESO 3.5-metre New Technology Telescope on July 11.08 by F. Mirabel, P.-A. Duc, S. Chaty (Service d'Astrophysique, Commissariat a l'Energie Atomique, Saclay, France). The peak intensity above sky is that of the brightest pixel in the object. The sky subtracted flux was integrated over circular apertures with diameters 5 and 10 arcsec, respectively, centered by cursor on the objects. The sky level was obtained as the median of a nearby, approx. 50 x 50 pixel empty region. The values are given relative to the brightest fragment (G) in the observed field. Fragment Peak Aperture Integrated Intensity 5 arcsec 10 arcsec A 0.30 0.12 0.15 B 0.38 0.24 0.28 C 0.31 0.23 0.26 D 0.28 0.14 0.18 E 0.57 0.45 0.46 F 0.47 0.30 0.32 G 1.00 1.00 1.00 H 0.71 0.65 0.73 K 0.91 0.89 0.87 L 0.68 0.64 0.73 P 0.40 0.39 0.56