Sky & Telescope - September 2020 - 44
SEPTEMBER 2020 OBSERVING
Planetary Almanac
PLANET VISIBILITY (40°N, naked-eye, approximate) Mercury: hidden in the Sun's glare all
month * Venus: serves as the brilliant Morning Star all month * Mars: rises in the evening, culminates
before dawn * Jupiter: transits at dusk, sets after midnight * Saturn: roughly 8° east of Jupiter.
Mercury
11
September Sun & Planets
30
21
Venus
Date
Declination
Elongation
Magnitude
Diameter
Illumination
Distance
1
10h
41.4m
+8° 17′
-
-26.8
31′ 42″
-
1.009
30
12h
25.8m
-2° 47′
-
-26.8
31′ 56″
-
1.001
1
11h
30.9m
+4° 08′
13° Ev
-0.6
5.0″
92%
1.340
11
12h 28.3m
-3° 22′
19° Ev
-0.2
5.3″
84%
1.262
21
13h 18.8m
-10° 02′
24° Ev
-0.1
5.9″
75%
1.149
30
13h
58.0m
-14° 54′
26° Ev
0.0
6.6″
63%
1.018
1
7h
42.2m
+19° 25′
45° Mo
-4.3
19.5″
60%
0.855
11
8h 27.7m
+17° 56′
44° Mo
-4.2
17.9″
64%
0.930
21
9h 13.6m
+15° 38′
42° Mo
-4.1
16.6″
68%
1.003
30
9h
54.8m
+12° 54′
41° Mo
-4.1
15.6″
71%
1.066
1
1h
47.4m
+6° 32′
131° Mo
-1.8
18.9″
92%
0.496
16
1h
48.4m
+6° 43′
146° Mo
-2.2
21.0″
96%
0.445
30
1h 38.3m
+6° 11′
162° Mo
-2.5
22.4″
99%
0.418
1
19h 15.4m
-22° 43′
129° Ev
-2.6
44.3″
99%
4.448
30
19h 16.5m
-22° 43′
101° Ev
-2.4
40.7″
99%
4.849
1
19h
50.9m
-21° 17′
137° Ev
+0.3
18.0″
100%
9.244
30
19h
48.2m
-21° 26′
108° Ev
+0.5
17.2″
100%
9.645
Uranus
16
2h
31.0m
+14° 22′
133° Mo
+5.7
3.7″
100%
19.083
Neptune
16
23h 21.8m
-5° 19′
176° Ev
+7.8
2.4″
100%
28.926
Sun
1
16
Mercury
30
Mars
Venus
1
16
30
Jupiter
Mars
Jupiter
16
Saturn
Saturn
16
Uranus
Neptune
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.
10"
PLANET DISKS have south up, to match the
view in many telescopes. Blue ticks indicate the
pole currently tilted toward Earth.
+40°
10 h
+30°
GEMINI
6h
4h
Venus
PEGASUS
PISCES
EQUATOR
E RI DAN U S
H Y D R A
CANIS
MAJOR
8 am
14h
BOÖTES
Arcturus
6 am
OPHIUCHUS
A Q UIL A
CETUS
Sept
1 -2
27
Saturn
LIBRA
Jupiter
4 am
SAGITTARIUS
10 pm
+20°
+10°
-10°
23
ECL
Spica
IP
TIC
CORVUS -20°
Antares
Fomalhaut
LOCAL TIME OF TRANSIT
2 am
Midnight
+30°
VIRGO
20
CA P R ICOR NUS
12h
Mercury
A QUA R IUS
Neptune
Rigel
Sirius
10 am
16 h
HERCULES
Mars
ORION
- 40°
18 h
Vega
CYGNUS
TA U R U S
Betelgeuse
-10°
-30°
20 h
ARIES
Uranus
Procyon
0°
0h
22h
RIGHT ASCENSION
7
CANCER
-20°
2h
Pleiades
10
13
LEO
+20°
8h
Castor
Pollux
Right Ascension
DECLINATION
Sep 1
8 pm
-30°
SCORPIUS
6 pm
4 pm
2 pm
-40°
The Sun and planets are positioned for mid-September; the colored arrows show the motion of each during the month. The Moon is plotted for evening dates in the Americas when it's waxing (right
side illuminated) or full, and for morning dates when it's waning (left side). "Local time of transit" tells when (in Local Mean Time) objects cross the meridian - that is, when they appear due south and
at their highest - at mid-month. Transits occur an hour later on the 1st, and an hour earlier at month's end.
44
SEPTEMBER 2 02 0 * SK Y & TELESCOPE
http://www.skyandtelescope.org
Sky & Telescope - September 2020
Table of Contents for the Digital Edition of Sky & Telescope - September 2020
Contents
Sky & Telescope - September 2020 - Cover1
Sky & Telescope - September 2020 - Cover2
Sky & Telescope - September 2020 - 1
Sky & Telescope - September 2020 - Contents
Sky & Telescope - September 2020 - 3
Sky & Telescope - September 2020 - 4
Sky & Telescope - September 2020 - 5
Sky & Telescope - September 2020 - 6
Sky & Telescope - September 2020 - 7
Sky & Telescope - September 2020 - 8
Sky & Telescope - September 2020 - 9
Sky & Telescope - September 2020 - 10
Sky & Telescope - September 2020 - 11
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Sky & Telescope - September 2020 - Cover3
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