580487
17
Zoom out
Zoom in
Previous page
1/26
Next page
17
Star hopping to the Andromeda Galaxy (M31) is a snap, since all the stars needed to do so are visible to the naked
eye.
Star hopping will take some getting used to and objects that don’t have stars near them that are visible to the naked
eye are challenging. One such object is M57 (Figure 5-2), the famed Ring Nebula. Here's how to find it:
1. Find the constellation of Lyra, a small parallelogram visible in the summer and fall months. Lyra is easy to pick
out because it contains the bright star Vega.
2. Start at the star Vega—Alpha (α) Lyrae—and move a few degrees southeast to find the parallelogram. The four
stars that make up this geometric shape are all similar in brightness, making them easy to see.
3. Locate the two southernmost stars that make up the parallelogram—Beta (β) and Gamma (γ) Lyra.
4. Point about halfway between these two stars.
5. Move about ½° toward Beta (β) Lyra, while remaining on a line connecting the two stars.
6. Look through the telescope and the Ring Nebula should be in your field of view. The Ring Nebula’s angular
size is quite small and difficult to see.
7. Because the Ring Nebula is rather faint, you may need to use “averted vision” to see it. “Averted vision” is a
technique of looking slightly away from the object you’re observing. So, if you are observing the Ring Nebula,
center it in your field of view and then look off toward the side. This causes light from the object viewed to fall
on the black and white sensitive rods of your eyes, rather than your eyes color sensitive cones. (Remember that
when observing faint objects, it’s important to try to observe from a dark location, away from street and city
lights. The average eye takes about 20 minutes to fully adapt to the darkness. So always use a red-filtered
flashlight to preserve your dark-adapted night vision).
These two examples should give you an idea of how to star hop to deep-sky objects. To use this method
on other objects, consult a star atlas, then star hop to the object of your choice using “naked eye” stars.
Figure 5-2
17


Need help? Post your question in this forum.

Forumrules


Report abuse

Libble takes abuse of its services very seriously. We're committed to dealing with such abuse according to the laws in your country of residence. When you submit a report, we'll investigate it and take the appropriate action. We'll get back to you only if we require additional details or have more information to share.

Product:

For example, Anti-Semitic content, racist content, or material that could result in a violent physical act.

For example, a credit card number, a personal identification number, or an unlisted home address. Note that email addresses and full names are not considered private information.

Forumrules

To achieve meaningful questions, we apply the following rules:

Register

Register getting emails for Celestron AstroMaster 90AZ at:


You will receive an email to register for one or both of the options.


Get your user manual by e-mail

Enter your email address to receive the manual of Celestron AstroMaster 90AZ in the language / languages: English as an attachment in your email.

The manual is 2,32 mb in size.

 

You will receive the manual in your email within minutes. If you have not received an email, then probably have entered the wrong email address or your mailbox is too full. In addition, it may be that your ISP may have a maximum size for emails to receive.

Others manual(s) of Celestron AstroMaster 90AZ

Celestron AstroMaster 90AZ User Manual - German - 25 pages


The manual is sent by email. Check your email

If you have not received an email with the manual within fifteen minutes, it may be that you have a entered a wrong email address or that your ISP has set a maximum size to receive email that is smaller than the size of the manual.

The email address you have provided is not correct.

Please check the email address and correct it.

Your question is posted on this page

Would you like to receive an email when new answers and questions are posted? Please enter your email address.



Info