Click on the image to see a larger chart that includes Uranus.
Sky & Telescope: Casey B. Reed.
Two solar-system bodies just below naked-eye brightness can be found with binoculars in eastern Aquarius on October and November evenings. The minor planet 4 Vesta loops through the dim “water streams” pouring from Aquarius’s bucket. It dims from magnitude 6.4 on October 1st to 7.1 on November 1st and 7.6 on December 1st.
Uranus, which is 10 to 13 times farther away, moves much more slowly as it glows at magnitude 5.8 south of Aquarius’s elbow.
Stars in the chart are plotted to magnitude 8.0. Typical binoculars show a field of view a little wider than the 5° spacing of the tick marks along the sides.
Interestingly, both Vesta and Uranus could have joined the list of naked-eye planets in ancient times — had anyone mapped the sky carefully. Vesta reaches magnitude 5.4 at some oppositions, and Uranus is never fainter than 6.0.
About Alan MacRobert
Alan M. MacRobert became an avid Sky & Telescope subscriber in 1966 at age 14, joined the editorial staff in 1982, and is now a senior contributing editor, semi-retired. He played a role in practically every part of the magazine and the company's other products for more than a generation, both on the amateur-observing side and the science-reporting side. In 1994 a book collection of his observing how-tos and telescopic sky tours was published as Star Hopping for Backyard Astronomers. He has produced This Week's Sky at a Glance online every week since 1989.
0
Comments
You must be logged in to post a comment.