Sky & Telescope - November 2021 - 49
DEBRA CERAVOLO
Star magnitudes
Star magnitudes
Two November Oppositions
BOTH URANUS AND CERES reach
opposition this month. Uranus does so
on the 5th (0h UT), and Ceres on the
27th (4h UT).
On opposition night, Uranus shines
pThe partially eclipsed Moon sets at
sunrise on May 26, 2021, as seen from Anarchist
Mountain, east of Osoyoos, British
Columbia, Canada.
ruddy brown. Whatever the hue,
the near-total aspect of the eclipse
guarantees a colorful and beautiful
sight, with the Moon floating some
5½° south-southwest of the Pleiades
cluster around the time of maximum
eclipse.
You might try your hand at carefully
noting the Moon's appearance
so that you can compare one eclipse
with another. The Danjon scale is
typically used to estimate the Moon's
brightness and color during a total
eclipse. But there's no reason you
can't put it to use during this neartotal
event by hiding the Moon's
uneclipsed edge behind a building.
The scale ranges from L=0 for a
very dark eclipse to L=4 for a bright,
copper-red or orange eclipse.
Another fun project is to carefully
time when the umbral shadow
crosses prominent craters. Such
crater timings help gauge the size
of Earth's shadow, which can vary
depending on the state of our
planet's atmosphere. Roger Sinnott,
a Sky & Telescope Senior Contributing
Editor, plans to update predictions
for umbral immersion and emersion
times for selected craters on
the magazine's website (skyandtelescope.org)
prior to the eclipse. He'd
be happy to receive your observations
at roger.sinnott@verizon.net.
at magnitude 5.7 in southern Aries, 5.1°
north-northwest of 4.3-magnitude Mu
(µ) Ceti. Typical of outer planets around
opposition, Uranus spends the month
moving westward in retrograde motion.
The nearly full Moon passes less than
2° south of the planet on the 17th.
Uranus is slowly brightening as it
approaches its August 2050 perihelion.
Dimly visible to the naked eye under
moonless rural skies, it will reach
magnitude 5.4 at oppositions from 2048
to 2052. If light pollution and satellites
haven't overrun the sky by then, more
people than ever might see the distant
planet without optical aid.
Uranus is a pretty sight in a telescope.
A 3-inch refractor magnifying
at 75× will reveal its tiny, aqua disk.
However, even in larger instruments,
the planet remains stubbornly small.
With an apparent diameter of 3.8″ this
month, discerning any detail requires
excellent seeing and careful scrutiny.
Some amateurs have occasionally
sighted faint bands with 14-inch and
larger instruments at magnifications of
400× and greater.
2h 55m
2h 50m π
2h 45m
If you have an 8-inch or larger scope,
you can hunt for the two brightest Uranian
moons, Titania and Oberon. Titania,
at magnitude 13.9, is very slightly
brighter than Oberon at 14.1, but it's
also closer to the planet. At maximum
northern and southern elongations,
Titania is a faint speck about 30″ from
Uranus's limb compared to Oberon's
40″. Use the highest magnification seeing
will allow and position Uranus just
outside the field of view to reduce glare
from the planet's disk.
To check the positions of the these
satellites on any given night, visit the
2
3
4
5
6
α
ARIES
γ
Path of
Uranus
M74
β
+20°
λ
μ
γ
α
3h 00m
M77
2h 40m
2h 35m
2h 30m
+17°
δ 2h 30m
ξ2
ξ1
+10°
PSC
CETUS
α
2h 00m
0°
ο
ν
Sept 1
2021
+16°
Oct 1
Apr 1
σ
5
6
7
8
9
ο
Nov 1
ARIES
Dec 1
Jan 1
2022
+14°
Mar 1
29
Feb 1
+15°
+13°
sk yand tele scope .o r g * NOVEMBER 2021 49
Path of Uranus
http://skyandtelescope.org
http://skyandtelescope.org
http://skyandtelescope.org
Sky & Telescope - November 2021
Table of Contents for the Digital Edition of Sky & Telescope - November 2021
Contents
Sky & Telescope - November 2021 - Cover1
Sky & Telescope - November 2021 - Cover2
Sky & Telescope - November 2021 - 1
Sky & Telescope - November 2021 - Contents
Sky & Telescope - November 2021 - 3
Sky & Telescope - November 2021 - 4
Sky & Telescope - November 2021 - 5
Sky & Telescope - November 2021 - 6
Sky & Telescope - November 2021 - 7
Sky & Telescope - November 2021 - 8
Sky & Telescope - November 2021 - 9
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Sky & Telescope - November 2021 - 11
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