background image

8

Observing Tips: 

Star hopping

Star hopping is a technique used by amateur astronomers to navigate the night sky. By using easily 
recognizable constellations and asterisms as a guide, an observer can locate stars and other objects.

For example, Polaris, which is 
commonly referred to as The 
North Star, can be located quickly 
using star hopping. First, find the 
Big Dipper asterism in the Ursa 
Major constellation. The popular 
pattern is defined by seven stars, 
and the two stars on the front 
edge of the Big Dipper’s “bowl” 
are Merak and Dubhe. Next, draw 
an imaginary line from the bottom 
star (Merak) on this front edge 
through the top star (Dubhe) on 
the front edge. Follow the line to 
the first bright star you see. That 
should be Polaris. Finally, to verify 
your finding, locate the Little 
Dipper asterism. Polaris is the 
anchor star at the end of the Little Dipper’s “handle.” 

BIG DIPPER

LITTLE DIPPER

POLAR STAR

Zeta

Beta

Kochab

Pherkad

Gamma

Eta

Epsilon

Delta

Alpha

Alkaid

Alcor

Mizar

Alioth

Megrez

Phecda

Merak

Dubhe

Orion Nebula(M42):

 

Right ascension: 

05: 35.4 (hours: minutes)

Declination:

 -05: 27 (degrees: minutes)

Distance:

 Approximately 1,344 light years

The Orion Nebula is a vast star-forming region located in the 
“sword” branching off of the famous Orion’s Belt. Also known 
as Messier 42, this diffuse nebula is bright enough to see with 
the unaided eye — although it will only appear as a slightly 
foggy star. However, with your telescope, you can see many of 
the beautiful details, such as the billowing clouds of gas and 
dust where new stars are being born.

Image credit: NASA, ESA, M. Robberto (Space Telescope Science Institute/ESA) 
and the Hubble Space Telescope Orion Treasury Project Team

Image credit: Howard Eskildsen

Note: Images are for illustration purposes only. Quality of your image may very depending upon atmospheric conditions and location.

Possible Objects for Observation: 

What you can observe at any one time in your telescope depends 
on several factors beyond aperture and magnification. These 
factors include location, date, time and sky conditions. The 
following are all objects that can be seen with the unaided eye 
and/or binoculars. Your telescope can enhance views of any of 
these objects if the observing conditions are right.

The Moon:
Diameter:

 3,476 km

Distance:

 Approximately 384,401 km

The Moon is the Earth’s only natural satellite, and it is the second 
brightest object in the sky (after the Sun). Although it is our 
closest neighbor, a lot of people have never really taken a good 
long like at the Moon. With your telescope, you should be able to 
see several interesting lunar features. These include lunar maria, 
which appear as vast plains, and some of the larger craters. The 
best views will be found along the terminator, which is the edge 
where the visible and shadowed portions of the Moon meet.

Note: The positioning of the Big Dipper in relation to the Little 

Dipper does not change, but the orientation of both in the night sky 

will rotate throughout the year due to the motion of the Earth.

Содержание RT70400

Страница 1: ...ttery Hazardousifswallowed seeinstructions WARNING Thelenscontainsleadthatmaybeharmful Washhandsaftertouching WARNING Thisproductcanexposeyoutochemicalsincludinglead whichisknowntotheStateofCaliforniatocausecancer Formoreinformationgotowww P65Warnings ca gov WARNING RT70400 INSTRUCTION MANUAL 70 MM REFLECTOR TELESCOPE W PANHANDLE MOUNT 1 INCLUDED X1 CR2032 3V ...

Страница 2: ...ALS LIKE PLASTIC BAGS AND RUBBER BANDS AWAY FROM CHILDREN AS THEY POSE A RISK OF SUFFOCATION DISPOSE OF PACKAGING MATERIALS AS LEGALLY REQUIRED CONSULT THE LOCAL AUTHORITY ON THE MATTER IF NECESSARY AND RECYCLE MATERIALS WHEN POSSIBLE THE WEEE SYMBOL IF PRESENT INDICATES THAT THIS ITEM CONTAINS ELECTRICAL OR ELECTRONIC COMPONENTS WHICH MUST BE COLLECTED AND DISPOSED OF SEPARATELY NEVER DISPOSE OF ...

Страница 3: ... Optical Tub Assembly OTA 3 Red Dot Viewfinder 4 Focuser 5 Diagonal 6 Focus Wheel 7 Panhandle Alt Azimuth Mount 8 1 25 20 mm 10 mm Kellner Eyepieces 9 Smartphone Adapter 10 Travel Case Available Downloads Visit www esmanuals com What s Included phone not included ...

Страница 4: ...viewfinder up and down and the other will move it side to side Your viewfinder is now aligned Note To preserve battery life don t forget to turn off the viewfinder after use Using Your Telescope After you have aligned your viewfinder you are ready to start observing Put the 20 mm eyepiece into the diagonal to get the widest field of view This wider field of view will make it easier to locate and t...

Страница 5: ...e use only a photo grade soft brush or a lint free cloth like a microfiber cloth Do not press down too hard while cleaning as this might scratch the lens If necessary the cleaning cloth can be moistened with an optical glass cleaning fluid and the lens wiped clean using very little pressure The eyepiece is NOT waterproof so do not spray fluids directly onto the glass or dip it in water Never use h...

Страница 6: ...ce unsupported or unattended on the adapter pad Though the surface of the adapter pad is designed with suction cups and is non skid the manufacturer cannot assure that the pad will support the weight of various devices or guarantee that it will adhere to all surfaces on various smart devices The pad is not intended to secure balance or support the device on its own and the operator should not let ...

Страница 7: ...7 Notes ...

Страница 8: ...wever with your telescope you can see many of the beautiful details such as the billowing clouds of gas and dust where new stars are being born Image credit NASA ESA M Robberto Space Telescope Science Institute ESA and the Hubble Space Telescope Orion Treasury Project Team Image credit Howard Eskildsen Note Images are for illustration purposes only Quality of your image may very depending upon atm...

Страница 9: ... amazing in a telescope the shape of this bright double lobed nebula has been compared to a dumbbell an hourglass or an apple core As an added bonus the white dwarf that lies at the heart of the Dumbbell Nebula is larger than any other star of its kind Andromeda Galaxy M31 Right ascension 00 42 7 hours minutes Declination 41 16 degrees minutes Distance Approximately 2 54 million light years The An...

Страница 10: ...objects may appear inverted sideways or at an angle depending on how your tube is oriented due to optical design This rotation is perfectly normal on all Newtonian reflectors and will not affect astronomical viewing Refractor A refracting telescope uses a collection of lenses to gather and focus light A refractor s views will be upside down if a diagonal is not in use A standard diagonal will gene...

Страница 11: ...rtical axis mirror image To get an image without this rotation you will need to use a special diagonal with an erect image prism Eyepiece An eyepiece is an optical accessory comprised of several lens elements It determines the magnification of a particular observing setup Primary Mirror The primary mirror is the principle light gathering surface of a reflector telescope Secondary Mirror A secondar...

Страница 12: ...ar aperture has a focal ratio of f 10 Focal length Telescope The focal length is the distance in millimeters between the objective lens or primary mirror and the point at which entering light rays converge otherwise known as the focal point The focal lengths of the telescope tube and the eyepiece are used to determine magnification Focal length Eyepiece The focal length is the distance in millimet...

Страница 13: ...her in an achromatic doublet design to minimize chromatic aberrations They typically produce an apparent field of view around 45 Plössl Eyepieces A Plossl eyepiece uses two doublets a pairing of lens for a total of four lens elements This eyepiece design delivers sharp views and an apparent field of view of approximately 50 which works well for both planetary and deep sky viewing Barlow Lens A Bar...

Страница 14: ...APHIC and Yellow Border Design are trademarks of the National Geographic Society used under license 2021 Explore Scientific LLC 1010 S 48th Street Springdale AR 72762 All rights reserved Made in China explorescientific com 866 252 3811 Contents colors and specifications may vary 14 ...

Отзывы: