Comets


Now that Hale-Bopp has departed from our skies we have to make do with this selection of fainter objects.

To find out more about comet and asteroid impact science, comet images from around the globe including a few from here, check out a new CD-ROM produced by AAI and follow this link:


IMPACT: Ground Zero

Comet Linear C/1998 U5

Recently discovered (Oct. 31st) by the LINEAR satellite. This is well placed in Auriga at the moment and brightening rapidly. Currently at mag 9.5 and showing rapid motion.




Comet 21P Giacobini-Zinner

The parent comet of the Draconid meteor shower. Maximum was due on Oct. 8th, but few were visible from the U.K. although the Far East had better displays.



Comet Stonehouse (C/1998 H1)

This mag 10.5 comet was discovered a few days ago by Patrick Stonehouse. On May 3rd it was a hard object to see visually with the moon at first quarter. This image is an 8x40 sec exposure with 50 cm f/4 and SX CCD.



Comet 55P/Tempel-Tuttle (1997E1)

This comet makes its closest approach to us on January 17th, its main claim to fame lies in the fact that it is the parent comet of the Leonid Meteor shower which is due to peak in November 1999.


NASA Leonid Meteor Page

January 24th

The comet has now much enlarged, the coma appeared circular about eight arc minutes in diameter. It was easily visible in 50cm x133 at about mag eight.



January 6th


First observations of Comet 55P/Tempel-Tuttle - January 6th 1998

The moon at first quarter was brightening the sky to the west, 
but my real target tonight was Comet 55P/Tempel-Tuttle (1997 E1).
This is currently a morning object in CV, and tonight will rise 
in the early morning hours after the Moon has set. It's of interest
as it is the parent comet of the Leonid meteor shower, and was 
originally discovered in 1865 Dec 19 by  William Tempel in Marseilles
and on 1866 Jan 6 by Horace Tuttle from Harvard. (Hey I've just 
realised tonight's the 132nd  anniversary of Tuttle's discovery).

At discovery it was mag 6, but alas not so bright tonight. Having 
plotted its position on Megastar I realised that it was  going to
pass very close to the pair of interacting galaxies NGC 4490/85. 
Many of these faint comets although they are interesting objects 
to hunt down are fairly boring CCD targets showing just a feeble 
coma surrounding a slightly brighter central condensation. The 
chances in imaging them in the same field of bright galaxies to 
add interest are fairly few and far between, CCDs have notoriously 
small fields of view and in my case 10x7 arc mins.

According to my software the comet would be about twenty arc minutes
to the south of the galaxy and reach  closest  approach at a distance
of eight arc minutes at 0200 hr. U.T. when I should be able to catch 
it in the same field. It always amazes me how accurate modern star 
charting software is these days -  the comet  was right on the 
predicted position but much fainter than the predicted 8th mag. I 
could  only just see it visually with 50 cm f/4  x130 and I should 
say it was more like 11/12th mag.

It was soon apparent that the comet was "motoring" along pretty fast
at about 6 arcmin/hr., and movement was detectable after each 40 sec 
exposure. The comet itself was nothing to write home about, even half
a dozen stacked 40 sec exposures  didn't reveal much, perhaps a 2-3 
arc minute coma extending easttwards. However, it reaches the closest 
to Earth in about a week's time, lets hope it leaves a good trail of 
debris in its wake, to give us a grand Leonid meteor shower next year.


Comet 103P/ Hartley 2


Exposure details: 4x40 sec SX CCD + 50 cm f/4. False colour image


Comet Meunier-Dupouy (1997 J2)



Comet Utsunomiya (1997T1)


Comet Utsunomiya is at present a tenth magnitude object sporting a short tail (2 arc minutes). It is well placed high in the evening sky at the moment but is a fast moving object. The bright star in this image is mag 6. This is a 2x40 sec exposure with 50cm f/4 and SX CCD.