Messier Club - 70 object and object levels for the telescope. Astronomer's Messier Journal. Binocular Messier Club - 50 of the best Messier objects for binoculars. Deep Sky Binocular Club - 60 additional deep sky objects for binoculars. Herschel Club - deep sky objects for the telescope. Astronomer's Herschel Journal. Herschel II Club - more challenge deep-sky objects for the telescope. Buy Manual from AL Sales. Lunar Club - features on the moon for naked eye, binoculars, and telescope. Sunspotters Club - observe and study sunspots and their cycles. Urban Club - observe objects in heavily light-polluted areas.
Asteroid Club - learn to identify and observe asteroids and minor planets. Universe Sampler - a journey through the universe for the beginner. Planetary Club - 27 selected projects to introduce the pleasures of planetary observing. The Astronomer's Journal. Planetary Society. Methods include simply looking at the night sky with the naked eye , using binoculars , and using a variety of optical telescopes of varying power and quality, as well as additional sophisticated equipment, such as cameras , to study light from the sky in both the visual and non-visual parts of the spectrum.
Commercial telescopes are available, new and used, but it is also common for amateur astronomers to build or commission the building of their own custom telescopes.
Some people even focus on amateur telescope making as their primary interest within the hobby of amateur astronomy. Although specialized and experienced amateur astronomers tend to acquire more specialized and more powerful equipment over time, relatively simple equipment is often preferred for certain tasks. Amateur astronomers also use star charts that, depending on experience and intentions, may range from simple planispheres through to detailed charts of very specific areas of the night sky.
Amateur astronomers often like to keep records of their observations, [ according to whom? Observing logs typically record details about which objects were observed and when, as well as describing the details that were seen. Sketching is sometimes used within logs, and photographic records of observations have also been used in recent times. The information gathered is used to help studies and interactions between amateur astronomers in yearly gatherings. Although not professional information or credible, [ according to whom? The popularity of imaging among amateurs has led to large numbers of web sites being written by individuals about their images and equipment.
Much of the social interaction of amateur astronomy occurs on mailing lists or discussion groups. A great deal of the commerce of amateur astronomy, the buying and selling of equipment, occurs online. Many amateurs use online tools to plan their nightly observing sessions, using tools such as the Clear Sky Chart. While a number of interesting celestial objects are readily identified by the naked eye, sometimes with the aid of a star chart, many others are so faint or inconspicuous that technical means are necessary to locate them.
Although many methods are used in amateur astronomy, most are variations of a few specific techniques.
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Star hopping is a method often used by amateur astronomers with low-tech equipment such as binoculars or a manually driven telescope. It involves the use of maps or memory to locate known landmark stars, and "hopping" between them, often with the aid of a finderscope. Because of its simplicity, star hopping is a very common method for finding objects that are close to naked-eye stars.
More advanced methods of locating objects in the sky include telescope mounts with setting circles , which assist with pointing telescopes to positions in the sky that are known to contain objects of interest, and GOTO telescopes , which are fully automated telescopes that are capable of locating objects on demand having first been calibrated. The advent of mobile applications for use in smartphones has led to the creation of many dedicated apps.
These apps make use of the inbuilt hardware in the phone, such as GPS location and gyroscope. Useful information about the pointed object like celestial coordinates , the name of the object, its constellation, etc. Some paid versions give more information.
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These apps are gradually getting into regular use during observing, for the alignment process of telescopes. Setting circles are angular measurement scales that can be placed on the two main rotation axes of some telescopes. By knowing the coordinates of an object usually given in equatorial coordinates , the telescope user can use the setting circle to align i.
A computerized setting circle is called a "digital setting circle" DSC. Although digital setting circles can be used to display a telescope's RA and Dec coordinates, they are not simply a digital read-out of what can be seen on the telescope's analog setting circles.
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As with go-to telescopes, digital setting circle computers commercial names include Argo Navis, Sky Commander, and NGC Max contain databases of tens of thousands of celestial objects and projections of planet positions. To find a celestial object in a telescope equipped with a DSC computer, one does not need to look up the specific RA and Dec coordinates in a book or other resource, and then adjust the telescope to those numerical readings. Rather, the object is chosen from the electronic database, which causes distance values and arrow markers to appear in the display that indicate the distance and direction to move the telescope.
The telescope is moved until the two angular distance values reach zero, indicating that the telescope is properly aligned.
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When both the RA and Dec axes are thus "zeroed out", the object should be in the eyepiece. Many DSCs, like go-to systems, can also work in conjunction with laptop sky programs. Computerized systems provide the further advantage of computing coordinate precession. Traditional printed sources are subtitled by the epoch year , which refers to the positions of celestial objects at a given time to the nearest year e. Most such printed sources have been updated for intervals of only about every fifty years e.
Computerized sources, on the other hand, are able to calculate the right ascension and declination of the "epoch of date" to the exact instant of observation. GOTO telescopes have become more popular since the s as technology has improved and prices have been reduced.
see With these computer-driven telescopes, the user typically enters the name of the item of interest and the mechanics of the telescope point the telescope towards that item automatically. They have several notable advantages for amateur astronomers intent on research. For example, GOTO telescopes tend to be faster for locating items of interest than star hopping, allowing more time for studying of the object.
GOTO also allows manufacturers to add equatorial tracking to mechanically simpler alt-azimuth telescope mounts, allowing them to produce an overall less expensive product. GOTO telescopes usually have to be calibrated using alignment stars in order to provide accurate tracking and positioning.
However, several telescope manufacturers have recently developed telescope systems that are calibrated with the use of built-in GPS, decreasing the time it takes to set up a telescope at the start of an observing session. With the development of fast Internet in the last part of the 20th century along with advances in computer controlled telescope mounts and CCD cameras "Remote Telescope" astronomy is now a viable means for amateur astronomers not aligned with major telescope facilities to partake in research and deep sky imaging.
This enables anyone to control a telescope a great distance away in a dark location. The observer can image through the telescope using CCD cameras.
The digital data collected by the telescope is then transmitted and displayed to the user by means of the Internet. An example of a digital remote telescope operation for public use via the Internet is the Bareket observatory , and there are telescope farms in New Mexico ,  Australia and Atacama in Chile. Because CCD imagers are linear, image processing may be used to subtract away the effects of light pollution, which has increased the popularity of astrophotography in urban areas.
Narrowband filters may also be used to minimize light pollution. Scientific research is most often not the main goal for many amateur astronomers, unlike professional astronomers. Work of scientific merit is possible, however, and many amateurs successfully contribute to the knowledge base of professional astronomers. Astronomy is sometimes promoted as one of the few remaining sciences for which amateurs can still contribute useful data. To recognize this, the Astronomical Society of the Pacific annually gives Amateur Achievement Awards for significant contributions to astronomy by amateurs.
The majority of scientific contributions by amateur astronomers are in the area of data collection. In particular, this applies where large numbers of amateur astronomers with small telescopes are more effective than the relatively small number of large telescopes that are available to professional astronomers. Several organizations, such as the American Association of Variable Star Observers and the British Astronomical Association , exist to help coordinate these contributions.
Amateur astronomers often contribute toward activities such as monitoring the changes in brightness of variable stars and supernovae , helping to track asteroids , and observing occultations to determine both the shape of asteroids and the shape of the terrain on the apparent edge of the Moon as seen from Earth. With more advanced equipment, but still cheap in comparison to professional setups, amateur astronomers can measure the light spectrum emitted from astronomical objects, which can yield high-quality scientific data if the measurements are performed with due care.
A relatively recent role for amateur astronomers is searching for overlooked phenomena e.