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Comet C/2013 TW5 (Spacewatch)

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

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

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

C/2013 TW5    11/03/2014 21:44:54  17.46  17.08  17.17  17.16  16.83          2.8  16.0  B96

C/2013 TW5    11/03/2014 21:44:54*  0.35   0.21   0.21   0.34   0.56            3   3.7  CMC

COMET         UTC                   DELTA    R    APER    Mag   AfRho   +/-   Log   Obs

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

C/2013 TW5    11/03/2014 21:44:54    5.21   5.99   5.29  17.61    3    843   301  2.926  B96

Discovery:MPEC 2013-T92, 2013 October 12

Tim Bressi discovered this object at the Steward Observatory, Kitt Peak with the 0.9m Spacewatch reflector on October 3.49. It was first reported as an unusual asteroid, which had a period of around 16 years with perihelion at 3.1 AU in 2015 September. [MPEC 2013-T47, 2013 October 6, 3-day orbit].  Six days later a further MPEC [2013-T92, 2013 October 12] reported the object to be a comet, following further observations by Spacewatch and Hidetaka Sato. The MPEC stated "Very preliminary elements" yet still gave them to five or more places of decimals.  Later circulars give a long period orbit with perihelion at 5.8 au in 2014 August.