How to distinguish the comet without a tail from the usual nebula
Shining, infinitely varied, unique beautiful abyss of space excited, fascinated and inspired mankind for more than one millennium. However, over time people have learned to see in the heavenly bodies, not only the beauty and mystery, but began to find harmony in their patterns, which can be adapted for their own quite mundane needs. To do this, first of all it was necessary to learn to distinguish one from the other celestial objects.
You will need:
- telescope or field glasses; - Prism.
Instruction how to distinguish the comet without a tail from the usual nebula
First of all, you must understand that without a tail of comets exists. If you do not see the tail of a comet with the naked eye, it means only one thing: the dust particles, the smallest fragments of stone and heated gas forming the tail, moving strictly according to the Sun-Earth-to-head in the direction of the comet from Earth. Thus, for an observer on earth comet tail hidden behind her head. At the same time around the head clearly distinguishable ghostly glow, which for irregular observations of celestial objects it is easy to be confused with the nebula. How can the uninitiated observer to distinguish between these so diverse celestial bodies?
If you do not have at least a primitive optics - field binoculars or a small telescope - celestial bodies you can not do without regular observations. To do this, choose one and the same time of day to the nearest minute, but adjusted for the duration of the day.
The second condition is the absence of such monitoring or to minimize the impact of electrical lighting. To do this, select from the remote town of terrain, and if this is not possible, try to find the most sublime places for observations: the high hills, the roofs of high-rise buildings, etc. Do not forget about safety precautions.
Under these conditions, observe the alleged comet and those celestial bodies that you think nebulae. Nebula will maintain its position among the stars for a long time, there will come the next season. Comet, on the contrary, a few days will be invisible to the naked eye.
The second difference is that the comet moves relative to the other celestial bodies, in particular - star, whereas nebula retain its position unchanged among the constellations. Watch the object of interest to you for a few nights in a row. The first observation as accurately sketch a possible (or take a picture - it will give you the most objective study) you are interested in the position of the object relative to famous stars and constellations. Repeat this process for a week, and you can easily notice how the comet has changed the location from baseline.
So, using binoculars, you can see that the nebula have a very diverse structure and form, and at higher magnification, you will notice that the inside or directly in the vicinity of the nebula there is always a star (stars), which highlights the ionized gas of the nebula. Near the comets are no stars except the Sun, but in the case of "tailless" representatives of the population of this species in our solar system at the same time to observe both objects is not possible.
Visual observation also shows that comets always have the correct shape and a uniform structure. And because of their similar origins, they also have a similar chemical composition that causes them to glow. The greatest strength of the glow in the comet's head falls on carbon and cyanogen, and closer to the core - in the hydrocarbon molecules and the hydrogen with nitrogen compounds. Therefore, in a frontal position with respect to an observer on earth, most comet looks like a diffuse spherical body yellowish color in the center, rolling in bright blue and then green and bluish shades.
The chemical composition of nebulae, especially their origin, the life cycle of a nearby star, and more allow them to acquire exotic, strange shapes, a variety of colors, and, importantly, the fibrous structure under the influence of magnetic fields nearby stars. Almost impossible to find two identical nebulae. In all this, you can see firsthand, armed with fairly simple telescope.
If you are familiar with spectral analysis, in their observations can safely use an ordinary prism. This simple tool will allow you to see the difference in the chemical composition of comets and nebulae. And then it all depends on you: how fun and exciting you will find this lesson so well you can get used to determine the composition of celestial bodies on the lines of the spectrum, even renewing their school learning.