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C/2008 FK75 (LEMMON-Siding Spring)

Historical observations

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: IAUC 8958

C/2008 FK75 was first discovered on 31 March 2008 in the course of the Mt. Lemmon Survey as an apparently asteroidal object. Next, independently was rediscovered by Siding Spring survey (again as apparently asteroidal) on 1 July 2008. Two days later, J. Young reported that images showed diffuse coma ; then other observers confirmed cometary appearance.

Observational arc of C/2008 FK75 covers 5.6 yr in a range of heliocentric distances: 8.24 au – 4.511 au (perihelion) – 9.51 au.

Comet had its closest approach to the Earth on 16 June 2010 (4.057 au), 3.5 months before perihelion passage

This Oort spike comet suffers a small planetary perturbations during its passage through the planetary system that lead to escape of the comet from the solar system on hyperbolic orbit .