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Comet C/2008 N1 (HOLMES)

Photometric data obtained from FOCAS-II software

                                   10x10  20x20  30x30  40x40  50x50  60x60   SNR   SB   COD

OBJECT        DATE       TIME        +/-    +/-    +/-    +/-    +/-    +/-     N  FWHM  CAT

------------  ---------- --------  -----  -----  -----  -----  -----  -----  ----  ----  ---

C/2008 FK75   24/07/2012 02:27:42  18.09  17.69  17.76                        8.8  17.4  B96

C/2008 FK75   24/07/2012 02:27:42*  0.08   0.15   0.16                          3   3.4  CMC

C/2008 FK75   08/09/2012 03:58:28  18.16  17.82  17.88                        2.4  17.4  B96

C/2008 FK75   08/09/2012 03:58:28*  0.27   0.25   0.24                          3   3.7  CMC

C/2008 FK75   13/01/2013 18:41:40  18.73  18.21  18.21                        4.3  17.4  B96

C/2008 FK75   13/01/2013 18:41:40*  0.20   0.29   0.38                          4   3.1  USN

Discovery:

An apparently 20 th magnitude asteroidal object discovered by Robert E. Holmes, Jr., Charleston, IL, U.S.A., on CCD images taken with a 0.40-m  f/5.8 Schmidt-Cassegrain reflector , and posted on the Minor Planet Center's 'NEOCP' webpage,has been found to show cometary appearance by other CCDastrometrists.  P. Birtwhistle (Great Shefford, Berkshire, England,0.40-m f/6 Schmidt-Cassegrain reflector) reports that the object appears slightly (about 10 percent) larger and more diffuse than nearby stars of similar brightness in a 23-min exposure from July 4.08 UT, while a 400-s exposure shows the object to be "soft" with very little central condensation and a diameter of 4", with a possible faint elongation 5" long in p.a. 225 deg (but not significantly different from stellar images).  L. Buzzi (Varese, Italy, 0.60-m f/4.6 reflector) writes that two series of stacked image totalling 30 min of exposure from July 5.03-5.07 show a nearly stellar coma apparently elongated about 10" toward p.a. about 190 deg; his stacked exposures from July 6.0 in very good seeing show an image slightly larger than nearby stars of similar brightness but with no tail or elongation.  S. Foglia reports that analysis of Holmes' images from July 2.35, 5.4, and 6.4 show a stellar appearance, though the size of the images appear slightly larger than stars of similar brightness.  J. Lacruz, La Canada, Spain, reports that his "blinking" of sets of images taken (apparently with a 0.3-m reflector) on July 5.06 show a diffuse coma about 12" in diameter, elongated to the southwest. ( IAUC 8959 )  -  MPEC 2008-N19