C/2013 V5 Oukaimeden

Closest to Earth on 16 September 2014 at 0.48AU
Closest to Sun on 28 September 2014 at 0.62AU
Maximum magnitude 6.5 in September 2014

2014 September 25 at 09:45UT
6x30sec exposure. Canon 60Da and Sigma 70-200mm f2.8 lens
Cropped. Image size is 3 degrees wide.
Galaxies M83 (at right) and NGC5253 (above the tail) are visible.
Visual estimate m1=7.2, Dia=3. DC=5, tail 30 in PA144.

Comet Oukaimeden made a highly favourable appearance during September 2014.
It was conveniently situated in evening skies during late September for southern hemisphere observers.
Perigee occurred on September 16 at 0.48AU and Perihelion occurred on September 28 at 0.62 AU.
The comet was situated closest to Earth and Sun around the same time and was at a high phase angle, highest at 121 degrees on Sep 18.

This should have had the effect of enhancing a comets brightness by forward scattering of sunlight, but the comet appeared to be dust poor.
The comet was predicted to reach magnitude 5, but fell short of expectation and achieved a maximum brightness of 6.5.
This was typical of dynamically new cometary behaviour.
The coma appeared 4' wide with a DC of 5-6. The ion tail reached 3 degrees photographically.

On September 1, the magnitude 8.0 comet was situated in Monoceros, in the hour prior to dawn.
It brightened very rapidly as it approached both Earth and Sun.
On September 9, the now magnitude 7.0 comet moved into Puppis and was adjacent to star cluster NGC 2539.
However, moonlight started to interfere.
From Sep 11, the comet could be seen in Hydra, straddling the borders of Pyxis and Antlia as it moved eastwards.
By Sep 19, the now magnitude 6.5 comet was located low in the southeast, as it approached solar conjunction.

Observing then switched into the more convenient evening hours with the best period between Sep 20 and 27, after which moonlight started to interfere.
It was then located low in the southwest after sunset.
The best time to observe was at 7:30pm local time for observers at 35S latitude,
when situated at an altitude of 6 degrees on Sep 20 and 21 degrees on Sep 27.
 
As October began, the magnitude 8 comet was situated in Hydra, still low in the west in the hour after sunset. 
Moonlight interferee until October 10.
Between Oct 10-12, the now magnitude 9 comet had an interesting rendezvous with star cluster NGC 5897 in Libra.
Between Oct 19-21, the now magnitude 10 comet was situated near the Zeta(1-4) Lib group of stars and 2 degrees East of Saturn.

Images


C/2013 V5 Oukaimeden
2014 July 28.82 UT: Canon 60Da camera and 300mm zoom lens cropped. 5x1 minute stack.
Visual magnitude m1=10.5, Coma Diameter=2', DC=3...25x100mm binoculars
Note the short dust tail


C/2013 V5 Oukaimeden + Rosette Nebula
2014 Aug 26.74 UT: Canon 60Da camera and Sigma 70-200mm f2.8 lens cropped. 6x30sec stack.
Visual magnitude m1=8.2, Coma Diameter=2', DC=5...25x100mm binoculars
Note the short dust tail


C/2013 V5 Oukaimeden

2014 Aug 28 at 19:16UT
4 x1 minute exposure stack on stars
Taken remotely at Siding Spring using I-Telescope T30 0.50-m f/6.8 astrograph + CCD + f/4.5 focal reducer


C/2013 V5 Oukaimeden
2014 Aug 28 at 19:16UT
4 x1 minute exposure stack on comet
Taken remotely at Siding Spring using I-Telescope T30 0.50-m f/6.8 astrograph + CCD + f/4.5 focal reducer


C/2013 V5 Oukaimeden
C/2013 V5 on 2014 Sep 7 at 18:50UT.
5x 1 minute stack, Itelescope T31.
Digital development to show detail surrounding nucleus. Note the parabolic dust hood.


C/2013 V5 Oukaimeden
Left: 2014 Sep 13 at 19:15UT.
Canon 60dA and Sigma 70-300mm f2.8, cropped. 5x30 second exposures.
FOV is 2 degrees high. North is lower left, Visual estimate = 6.6 through 8x40mm binoculars.
Note the easily visible reddish type II dust tail and a faint green type III dust trail towards the left.
The blue type I ion tail is barely visible towards upper right.
Compare this to the image at right taken with Siding Spring I-telescope t31 (4 minute stack but affected by moonlight)


Comet C/2013 V5 Oukaimeden.
2014 Sep 20 at 09:40UT
8x30 second exposure. Canon 60Da and Sigma 70-200mm f2.8 lens
Note the thin type I ion tail, nearly 3 degrees long in PA175 towards upper left,
a broad diffuse type II dust band stretching westwards towards lower left
and finally a very short green type III dust trail in PA 270
Visual magnitude 6.7, coma dia=4', DC=5/6

Finder Charts


August 2014


Early Sep morning


Late Sep evening


October evening