Quick and Dirty Photo Tips for Capturing Quick and Dirty Comets
Comet Lulin C/2007 N3 is our first photo friendly comet of 2009 so lets talk about a few ways to make the most of its visit.
By the end of February it should be within naked-eye visibility range or at least an easy target for binocular wielding comet stalkers. Comets are very unpredictable so be prepared for anything. It may sizzle or fizzle, but whatever it does, it will be fun to hunt and watch.
Currently its visible as a morning object. I easily saw it as a faint blob at 6 AM, with 15 x 70 binoculars northeast and in the same field of view with Lambda Libra. This is just outside the border of Scorpius, (near the scorpions head) so its an easy field to locate.
The nucleus or body of a comet is commonly described as being similar to a dusty or dirty snowball. Its made up of tiny frozen rocky bits and pieces in an icy/gassy mass.
The coma is a gas cloud surrounding the nucleus. Hydrogen gas sometimes wraps around the coma of a comet. If you saw Comet Holmes last year, it was wearing a large hydrogen cloud.
The tail appears when comets are near the Sun. The Sun vaporizes the comet material and we see the reflected vapor being pushed by the solar wind away from the Sun.
An ephemeris can be found at http://www.cfa.harvard.edu/iau/Ephemerides/Comets/2007N3.html
Or if you just want a simple chart look here http://www.spaceweather.com/images2009/15jan09/skymap_north_lulin.gif?PHPSESSID=d93ntf2c3gaplilolfji6gj6c5&PHPSESSID=qfs3q34hj2advqi3pcl3oi4045
Now for the quick and dirty tips:
1. Heads or tails? Do you want the coma or the comet tail to be the main feature of your photo? If you are planning on capturing the tail, then youll just need a good telephoto lens. If youre going after a head shot, then youll need a telescope and camera combo to grab all the fascinating details.
2. Make a movie. Comets are great action figures and play great starring roles in movies. They are ideal for showing motion. Not only are they noticeably moving through a star field, but often they display detachments or tail fragments break off. The coma often shows odd features and intricate characteristics.
3. Plot and plan out the comets track and photograph the comet in a pleasing star field. This doesnt always come into play, but being prepared ahead of time for a comet encounter with the Pleiades or Beehive is always a good idea.
4. Speaking of stars. Comets offer a variety of photographic scenes all at once. You can guide on the comet and make the comet the in focus subject and have a smeared star background. Or guide on the stellar background and keep the stars sharp and have a smeared comet. Either way is pleasing and makes a stunning photo. Just be warned that guiding on the head of the comet is more difficult because it is usually more diffuse than a stellar point of light.
5. Even if you cant see the comet, the photo has a good chance of being interesting and may turn out okay. Low surface brightness objects stand out on a long exposure better than what the human eye can detect. The example shown at the top of this article gives you a rough idea of this.
Other targets for February include:
Zodiacal Light for two weeks after evening twilight beginning Feb. 12
Feb. 22 Mercury and the Moon
Feb. 23 Jupiter and the Moon
Feb. 23 Mars and the Moon
Feb. 25 Ceres at opposition