C/2007 F1 LONEOS

Closest to Earth on Oct 28 2007 at 0.71AU
Closest to Sun on Oct 28 2007 at 0.40AU
Maximum magnitude 5 in Oct 2007

The comet was Initially only visible from northern hemisphere latitudes and reports in September suggested a rapid rate of brightening as it approached perihelion,
possibly achieving a maximum brightness of magnitude 4 in late October.
However the brightening rate stalled during October and comet LONEOS only reached 5th magnitude during perihelion.

The first southern hemisphere observations occurred in early November when the comet was situated very low in the south-western sky in the constellation of Scorpius.
On the evening of November 3, comet C/2007 F1 was a degree west of magnitude 7.3 globular cluster M80.
On the following 2 nights the comet was within 2 degrees of magnitude 5.6 globular cluster M4 near Antares.

C/2007 F1 LONEOS November 5.42 UT.
3 minute exposure ISO 800 with a Canon 300D digital camera + 300mm zoom lens, cropped.
The ion (gas) tail of the comet seen passing through Tau Scorpii is 5 degrees long.
Note the bright star Antares and globular star cluster M4 to the lower right. A satellite track is also visible crossing the image.


C/2007 F1 LONEOS November 11.43 UT
3x2 minute exposure ISO 800 with a Canon 300D digital camera + 100mm zoom lens, cropped.
Note a very faint 6 degree long ion tail extending towards the lower centre of the image.
The star cluster with associated nebulosity is NGC 6231.

My observations indicated rapid fading of this comet during November.
2007 Nov 5.42 UT: m1=6.0, Dia.=3', DC=7...25x100mm Binoculars
2007 Nov 6.42 UT: m1=6.7, Dia.=3', DC=6...25x100mm Binoculars
2007 Nov 7.42 UT: m1=7.4, Dia.=3', DC=6...25x100mm Binoculars
2007 Nov 8.42 UT: m1=7.4, Dia.=3', DC=6...25x100mm Binoculars
2007 Nov 10.43 UT: m1=7.6, Dia.=3', DC=6...25x100mm Binoculars
2007 Nov 11.43 UT: m1=7.8, Dia.=3', DC=6...25x100mm Binoculars
2007 Nov 13.43 UT: m1=8.3, Dia.=2', DC=5...25x100mm Binoculars