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C/2012 S1 (ISON)  -  2 may 2013

Astrometric data for minor planet center

COD H06

CON E.Bryssinck, Eyckensbeekstraat, Kruibeke, Belgium, [www.itelescope.net]

OBS E.Bryssinck

MEA E.Bryssinck

TEL 0.43-m f/6.8 astrograph + CCD + f/4.5 focal reducer

ACK MPCReport file updated 2013.05.02 08:44:45

AC2

NET CMC-14

    CK12S010  C2013 05 02.15253 06 42 05.30 +29 24 43.7          16.2 N      H06

    CK12S010  C2013 05 02.15497 06 42 05.36 +29 24 43.7          16.3 N      H06

    CK12S010  C2013 05 02.15757 06 42 05.43 +29 24 43.3          16.2 N      H06

----- end -----

Photometric data from FOCAS-II

COD I89

CON RAS Observatory, Nerpio, Spain

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

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

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

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

C/2012 S1     02/05/2013 03:43:14  15.84  15.33  15.15  15.11  15.17         12.6  18.9  H06

C/2012 S1     02/05/2013 03:43:14*  0.04   0.07   0.10   0.12   0.17            3   2.6  CMC

                                                                     AFRHO         LOG

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

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

C/2012 S1     02/05/2013 03:43:14    4.33   3.88   6.37  15.94   13   1139    90  3.057  H06

Af(rho) plot (morphology) of comet C/2012 S1 (ISON)

Af(rho) data available via request to CARA-coordinator

http://cara.uai.it

follow-up of comet C/2012 S1 (ISON) on 2 may 2013 by use of a remote 0.43-m f/4.5 telescope from the iTelelescope.net network New-Mexico USA - near Mayhill with R-Bessel filter. Image reveals a change in the tail, but maybe is this a very faint backgroundstar.  Af(rho) value is stable for several weeks at 1050 - 1100 cm, so no change in activity yet, but the comet passes the 4 AU as distance from the sun, so change in activity is expected. Increasing of observation of this comet is recommended. image and data see below: