Sky & Telescope - December 2022 - 44

DECEMBER 2022 OBSERVING
Planetary Almanac
PLANET VISIBILITY (40°N, naked-eye, approximate) Mercury visible at dusk from the 10th to
the 31st * Venus visible at dusk all month * Mars rises before sunset and is visible to dawn * Jupiter
transits in the early evening and sets after midnight * Saturn visible at dusk and sets in the evening.
Mercury
December Sun & Planets
Right Ascension
Dec 1
Venus
Mercury
1
Mars
Venus
16
31
11
21
31
Sun
Date
1
31
1
11
21
31
1
1
Jupiter
16
31
Mars
11
21
31
1
Jupiter
Saturn
16
Uranus
Saturn
Neptune
16
Uranus
16
31
1
31
1
31
16
16
Declination
16h 26.8m
18h 39.0m
17h 19.1m
18h 25.3m
19h 22.5m
19h 42.3m
17h 08.5m
18h 03.2m
18h 58.2m
19h 52.3m
5h 09.5m
4h 44.5m
4h 26.9m
23h 57.0m
0h 04.8m
21h 29.5m
21h 39.2m
2h 51.4m
23h 33.9m
Elongation
Magnitude
-21° 43′ - -26.8
-23° 08′ - -26.8
-25° 07′
-25° 38′
-23° 48′
-20° 48′
-23° 17′
-24° 12′
-23° 52′
-22° 19′
+24° 56′
+24° 52′
+24° 33′
-1° 53′
-0° 53′
-16° 09′
-15° 21′
+16° 03′
-4° 08′
12° Ev
17° Ev
20° Ev
15° Ev
10° Ev
12° Ev
15° Ev
17° Ev
170° Mo
169° Ev
150° Ev
110° Ev
82° Ev
71° Ev
43° Ev
142° Ev
89° Ev
-0.6
-0.6
-0.6
+0.8
-3.9
-3.9
-3.9
-3.9
-1.8
-1.7
-1.2
-2.6
-2.4
+0.8
+0.8
+5.7
+7.9
Diameter
Illumination
32′ 26″ -
32′ 32″ -
4.9″
5.5″
6.6″
8.7″
9.9″
10.0″
10.2″
10.4″
17.2″
16.5″
14.8″
43.6″
39.5″
16.4″
15.8″
3.7″
2.3″
Distance
0.986
94%
85%
63%
21%
99%
98%
97%
96%
100%
100%
97%
99%
99%
100%
0.983
1.359
1.224
1.017
0.770
1.680
1.660
1.637
1.610
0.544
0.567
0.633
4.525
4.995
10.118
100% 10.531
100% 18.892
100% 29.919
The table above gives each object's right ascension and declination (equinox 2000.0) at 0h Universal Time on selected dates,
and its elongation from the Sun in the morning (Mo) or evening (Ev) sky. Next are the visual magnitude and equatorial diameter.
(Saturn's ring extent is 2.27 times its equatorial diameter.) Last are the percentage of a planet's disk illuminated by the Sun and
the distance from Earth in astronomical units. (Based on the mean Earth-Sun distance, 1 a.u. equals 149,597,871 kilometers, or
92,955,807 international miles.) For other timely information about the planets, visit skyandtelescope.org.
Neptune
December
solstice
10 "
Uranus
PLANET DISKS are presented
north up and with celestial west to the
right. Blue ticks indicate the pole currently
tilted toward Earth.
ORBITS OF THE PLANETS
The curved arrows show each planet's
movement during December. The outer
planets don't change position enough in
a month to notice at this scale.
Earth
Mars
Jupiter
Saturn
March
equinox
Sept.
Neptune
Sun
Mercury
Venus
June
solstice
equinox
44
DECEMBER 2022 * SKY & TELESCOPE

http://www.skyandtelescope.org

Sky & Telescope - December 2022

Table of Contents for the Digital Edition of Sky & Telescope - December 2022

Contents
Sky & Telescope - December 2022 - Cover1
Sky & Telescope - December 2022 - Cover2
Sky & Telescope - December 2022 - 1
Sky & Telescope - December 2022 - Contents
Sky & Telescope - December 2022 - 3
Sky & Telescope - December 2022 - 4
Sky & Telescope - December 2022 - 5
Sky & Telescope - December 2022 - 6
Sky & Telescope - December 2022 - 7
Sky & Telescope - December 2022 - 8
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