Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.atmob.org/library/member/brewster/uranus_neptune_fall_99_finder.pdf Дата изменения: Sat Jun 10 23:45:09 2006 Дата индексирования: Mon Oct 1 21:46:37 2012 Кодировка: Поисковые слова: comet

Locating Uranus and Neptune in the constellation Capricornus for fall 1999
Alpha

Theta

Beta

Rho Pi Omicron Sigma

Key:

Magnitudes

3

4

5

6

7

8

Uranus (mag 5.7) Neptune (mag 7.9)

Shown for 5-Oct-99, but positions wont change much until mid-November

Using binoculars, you should be able to locate Uranus and possibly Neptune using the chart above, even from the light polluted suburbs of Boston. To find them using binoculars: First locate the constellation Capricornus, which will be in the southwest in the early evening (see the sky chart in the handout for an all-sky map). Next, make sure you can relate where youre looking with your eyes to where you look with the binoculars. A good place to do this are the two bright stars Alpha and Beta in the upper left corner of the map - each is a double. Next find Theta visually, and then with binoculars. The dotted line shows the typical field of view through binoculars. Make sure youve got the right star by comparing what you see with the map. On the map above, the bigger the black dot, the brighter the star (lower magnitude stars are brighter than higher magnitude ones). To help find Uranus, look for the little pattern of stars near it (called an asterism):

Follow a similar procedure for locating Neptune. Neptune will be tougher because there are no bright stars close by. Look for the triangle formed by Rho, Pi, and Omicron (from light polluted locations these 5th magnitude stars may not be visible without the binoculars). They point towards Sigma. Once you find Sigma, look further in the same direction and youll see Neptune. Look for the backwards L asterism:

It will be easier if you can mount your binoculars on a tripod to hold them steady. Binoculars do not have enough magnification to show Uranus and Neptune as anything more than points of light, so it is difficult to tell them from the nearby stars without using the map. One way to be sure is to mark the positions you see them in on this map, and then do the same thing a month later. By mid December both will have moved noticeably slightly up and to the left.

Written by: Brewster LaMacchia for use by NSAAC and ATMoB. Chart produced by The Sky software.