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Perihelion date: 19 January 2019
Perihelion distance (q): 4.3
Aphelion distance (Q) : 5.5
Period (years): 10.8
Eccentricity (e): 0.12
Inclination (i): 28.8
JPL orbit diagram
G. J. Garradd (Siding Spring Observatory, New South Wales, Australia) discovered
this comet on images obtained on 25 January 2007 using the 0.5-m Uppsala Schmidt
and a CCD camera. The three images indicated a magnitude of 18.0-18.3. In late
February, M. Meyer (Germany) announced that he had found three prediscovery
images on Siding Spring Observatory Digital Sky Survey images from 1975 and
1996. He had been slightly adjusting the early orbits that were calculated when he
found an image of the comet on a plate exposed on 26 February 1996. The
magnitude was given as 17.8. The orbit improvement brought about by this position
then enabled Meyer to locate the comet on images exposed on 31 May and 3 June
1975. The magnitude on these images was given as 15.5.
In linking all of these positions, G. V. Williams (Central Bureau for Astronomical
Telegrams) found that comet images reported on IAU Circular No. 3247 (25 July
1978) by R. D. Eberst also belonged to this comet. The images were also exposed at
Siding Spring Observatory, using the 1.2-m UK Schmidt, on 18 and 19 July 1977.
The magnitude was given as 18, while a tail extended about 3'.
Although it usually reaches 17.5 mag at best, the comet was unexpectedly bright at
15.5 mag in May and June 1975. It seems to have been a temporary outburst, as the
comet returned to its normal brightness in July 1977 at 18 mag. This comet is similar
to 111P/Helin-Roman-Crockett; large perihelion distance, almost circular orbit, and a
record of unexpected brightening in temporary outburst.
Observations (VEMag = visual equivalent magnitude)