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Comet C/2015 H1 (Bressi)

Photometric data obtained from FOCAS-II software

COD B96

CON BRIXIIS Observatory - Eyckensbeekstraat 2, B-9150 Kruibeke, Belgium

CATALOG: USNO A2.0 / CMC-14 - BAND: R

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

COMET         UTC                    +/-    +/-    +/-    +/-    +/-    +/-     N  FWHM  CAT

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C/2015 H1     10/07/2015 01:55:37  17.88  16.98  16.44  16.11  15.85  15.82   0.4  17.1  B96

C/2015 H1     10/07/2015 01:55:37*  0.30   0.26   0.21   0.24   0.12   0.16     3   3.3  USN

                                                                     AFRHO         LOG

COMET         UTC                   DELTA    r    BOX "   MAG   RSR    CM    +/-  AFRHO  OBS

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Af(rho) data acoording the CARA-approach is available via request to CARA-coordinator

http://cara.uai.it

Discovery:

T. H. Bressi reports the discovery of a comet with a diffuse extended center on CCD mosaic images taken with the Spacewatch 0.9-m f/3 reflector at Kitt Peak (discovery observations tabulated below).

2015  UT       R.A. (2000) Decl.       Mag. Observer

Apr.  20.46356 21 35 25.72 + 4 54 51.2 18.2 Bressi

20.47534 21 35 25.08 + 4 55 07.1 18.1 "

20.48713 21 35 24.43 + 4 55 23.3 18.0 "

After the object was posted on the Minor Planet Center's PCCP webpage, other CCD astrometrists obtained images showing the cometary appearance. A. R. Gibbs notes that images taken in fair seeing and transparency on Apr. 21.5 UT with the Steward Observatory 1.0-m reflector at Mount Lemmon show a round coma 6" in diameter and a short fan tail 6" long in p.a. 260-310 deg on four 30-s exposures. H. Sato (Tokyo, Japan; ten stacked 60-s exposures taken with a 0.61-m f/6.5 astrograph + luminance filter at the Sierra Remote Observatory near Auberry, CA, USA, on Apr. 21.50 UT) finds the comet to be strongly condensed with a round coma 10" in diameter, w-band magnitude 17.7 as measured within a circular aperture of radius 5".0, and a hint of tail 10" long toward p.a. 315 degrees. A. Novichonok writes that seven 60-s exposures taken by S. Nazarov with the Crimean Astrophysical Observatory 0.70-m f/4 AZT-8 reflector near Nauchny, Crimea, on Apr. 22.06 shows a diffuse, round coma 15" in diameter with no visible tail and total red mag around 16.6-17.2