astronomy

TEROPONG BINTANG PORTABLE

2009-05-24T12:12:00.001-07:00

Teleskop Astronomy Ukuran mini yang sangat mudah di bawa kemana saja dengan kemampuan untuk melihat object yang sangat jauh untuk di Bumi dan di angkasa, baik sekali untuk pemula dalam dunia Astronomy.

SPESIFIKASI:

* Astronomical 360mm focal length Refracting telescope

* 50mm Objective Lens diameter

* 45 degree diagonal viewing mirror

* 4 possible magnifications 18x 27x 60x 90x

* Two eyepieces: 20mm, 6mm Huygenian type

* 1.5x Erecting Eyepiece Lens* Focal Ratio F7.2

* Lightweight 'quick adjust' Aluminium Tripod

* Full Instructions* H 450mm L 390mm Wt 950gms

HARGA PROMO Rp 750.000,-

UNTUK PEMESANAN HUB:

Nomer Telpon: 021-93374454 / 021- 68861095 / 08569833381

Nomer Faks: 021-7330767
Alamat: PLAZA NAGARI PAKUBUWONO, Lantai Dasar blok B 09 . jl. kyai maja no 63 kebayoran baru jakarta selatanjakarta 15222, JakartaIndonesia

UNTUK INFO JENIS TEROPONG BINTANG LAINNYA , KLIK http://pro2000.indonetwork.co.id/

SKEMA Teropong Bintang

2009-05-24T12:03:00.000-07:00

Teropong bintang disebut juga teropong astronomi.
- terdiri dari 2 buah lensa cembung.
- jarak fokus lensa obyektif lebih besar dari jarak fokus lensa okuler.
Dasar Kerja Teropong
Obyek benda yang diamati berada di tempat yang jauh tak terhingga, berkas cahaya datang berupa sinar-sinar yang sejajar. Lensa obyektif berupa lensa cembung membentuk bayangan yang bersifat nyata, diperkecil dan terbalik berada pada titik fokus.
Bayangan yang dibentuk lensa obyektif menjadi benda bagi lensa okuler yang jatuh tepat pada titik fokus lensa okuler.
Penggunaan dengan mata tidak berkomodasi
Untuk penggunaan dengan mata tidak berkomodasi, bayangan yang dihasilkan oleh lensa obyektif jatuh di titik fokus lensa okuler.
Perbesaran anguler yang diperoleh adalah :
M = f (ob) / f (ok)
Panjang teropong adalah :
M = f (ob) + f (ok)
Penggunaan dengan mata berkomodasi maksimal
Untuk penggunaan dengan mata berkomodasi maksimal bayangan yang dihasilkan oleh lensa obyektif jatuh diantara titik pusat bidang lensa dan titik fokus lensa okuler.
Perbesaran anguler dapat diturunkan sama dengan penalaran pada pengamatan tanpa berakomodasi dan didapatkan :
M = f (ob) / So (ok)
Panjang teropong adalah :
M = f (ob) + So (ok)

The Moon

2009-05-24T12:01:00.001-07:00

The moon is the most prominent object in the night sky. It is big, bright, and easy to find. Because the lighting of the moon changes everyday with the changing phases, you get a different view of its features everyday. The moon offers much to see and you don't need a huge telescope to reveal its features. With binoculars or a small telescope (2-inch or 50-mm refractor, 4-inch or 100-mm reflector), you can observe:
mountains
craters
maria, or "seas"
terminator - the line between dark and light, where you can see the greatest contrast The moon is well known, so you can readily find maps or images of the moon, whether online or in periodicals or textbooks, to help you identify features that you observe. A large aperture telescope (6- to 10-inch / 15- to 25-cm) will reveal close-up images of these features. It is even possible, using your own observations or other images, to measure the heights of lunar mountains.
Contrary to popular belief, the best time to observe the moon is not during a full moon, but rather when the moon is between the last quarter and first quarter, because the sun shines at an angle to the lunar features and provides good relief. Sometimes, it is helpful to use a moon filter to enhance the contrast of the views and bring out details. Also, if the light is too bright and you have a reflecting telescope, you can reduce the amount of light and enhance the contrast by placing your hand, with your fingers spread apart, in front of the telescope's tube.

The Planets

2009-05-24T11:56:00.000-07:00

You will find views of the planets through a telescope quite satisfying, and they will keep you coming back for more. You can also observe planets from urban areas, where there may be moderate to substantial light pollution. With a small telescope (2-inch or 60-mm refractor, 4-inch or 100-mm reflector), you can see some details on the surfaces of planets, but a larger telescope (3- to 4-inch or 75- to 100-mm refractor, 6- to 10-inch or 15- to 25-cm reflector) will reveal better detail. Generally, refractors provide crisper images of planets, but lack the light gathering ability of reflectors. Regardless of which type of telescope you use, observing planets requires good seeing conditions -- steady, dry atmosphere with little or no clouds -- and you should cool your telescope to the outside temperature for about 30 minutes before observing. Cooling the telescope reduces air currents inside the tube that could produce fuzzy, blurring images

COMETS

2009-05-24T11:52:00.000-07:00

Comets are brief visitors from the outer solar system. They change brightness and develop tails as they pass close to the sun. The views of comets in telescopes vary dramatically with each comet. Comet Hale-Bopp was a spectacular image in my small telescope. I could see some of the nucleus, the coma and the dust tail. And comet Hyakutake had a similar view. However, not all comets brighten or develop enough to reveal good images in small telescopes. Many observers were disappointed in the showings of comets Kohoutek and Halley in the 1980s. Many amateur astronomers search for comets with binoculars or a small telescope and a great deal of patience.

Star Clusters

2009-05-24T11:48:00.000-07:00

Star clusters are close associations of thousands of stars or more. They can be open clusters or globular clusters. Star clusters offer spectacular views in a small telescope. One example is the Pleiades in the constellation Taurus (at right). The Pleiades has seven bright stars that can be seen with the naked eye; but when viewed in a small telescope like mine, many thousands jump out at you.

Nebulae

2009-05-24T11:45:00.000-07:00

Nebulae are clouds of gas and dust in interstellar space. One of my favorite nebulae is the Great Nebula in the constellation Orion (M42). It is easily seen with the naked eye as Orion's sword. It has a large gas and dust cloud, with an inner triangle of stars called the Trapezium. I can see the gas, but not with the detail of the Hubble image shown here. No amateur telescope has that degree of detail. The Orion nebula is an emission nebula, in that it emits light, as opposed to an absorption or dark nebula, which absorbs light (e.g. Horsehead Nebula, also in Orion). Some nebulae, such as the Horsehead, are a real challenge to find and observe

Nebulae are best viewed under low magnification, and rich-field telescopes can provide good views. Large aperture telescopes can gather enough light to produce bright images, and light pollution filters may help you to see details within nebulae, especially for urban/suburban astronomers. Nebulae are favorite targets for astrophotographers.

TEROPONG BINTANG PORTABLE

2009-05-24T11:23:00.000-07:00

Galaxies
Galaxies are massive systems of stars held together by gravity. They can be alone, but are mostly found in clusters. One galaxy, the Andromeda galaxy (M31), can be seen with the naked eye. In the Southern Hemisphere, the Large and Small Magellanic Clouds are satellite galaxies that orbit our galaxy, the Milky Way. Galaxies come in many shapes and sizes:
spiral (M31 in Andromeda)
elliptical (M87 in Virgo)
barred, spiral (NGC 1530 in Camelopardalis)
irregular (the Magellanic Clouds, M82 in Ursa Major) In a small telescope like mine, galaxies appear as faint, fuzzy patches. I can see M31 in Andromeda as an angled disc. To see fine detail in galaxies, including lanes of dust across them, you need a large aperture (8 to 10 inches or greater) telescope. Dark skies are essential for observing most galaxies. Like nebulae, galaxies are a favorite target for astrophotographers.