8
Annual Meteor Showers
Planet Information Table
Shower
Hourly
Parent comet
40
Lyrids
April 22
Quadrantids
15
Comet Thatcher
Asteroid 2003 EH1
Eta Aquarids
May 5
20
Comet Halley
(Unknown)
Delta Aquarids
July 28
20
Perseids
August 12
50
Comet Swift-Tuttle
Orionids
October 22
25
Comet Halley
Taurids
November 3
15
Comet Encke
Leonids
November 17
15
Comet Temple-Tuttle
Geminids
December 14
December 23
50
Asteroid 3200 Phaethon
Ursids
January 3
20
Comet Tuttle
Source:
Skywatching
by David H. Levy (Time-Life Books, 1994-98).
Dates can vary slightly. Hourly rate represents the number of meteors you might see under a
dark sky when the radient is near the zenith. Expect to see perhaps half as many more if the
shower is strong.
Date
NAME
MOONS** RINGS
DISTANCE
FROM SUN
(millions of mi/km)
ORBITAL
PERIOD
(in Earth years)
ROTATION
PERIOD
(hours in day)
SIZE
RELATIVE
TO EARTH
MASS
RELATIVE
TO EARTH
*Dwarf planet
**Known as of March 2009
MERCURY
36 / 58
0.2
1416
0.39 X
0.06 X
0
No
VENUS
67 / 108
0.6
5833
0.95 X
0.8 X
0
No
EARTH
93 / 150
1.0
24
1 X
1 X
1
No
MARS
142 / 228
1.9
25
0.53 X
0.1 X
2
No
CERES*
260 / 420
4.6
9
0.08 X
0.0002 X
0
No
JUPITER
484 / 778
11.9
10
11.2 X
318 X
63
Yes
SATURN
884 / 1423
29.5
10
9.4 X
95 X
60
Yes
URANUS
1783 / 2869
84
17
4.0 X
15 X
27
Yes
NEPTUNE
2792 / 4492
164.8
16
3.8 X
17 X
13
Yes
PLUTO*
4650 / 7500
248
153
0.2 X
0.002 X
3
No
ERIS*
9114 / 14,700
557
7
0.2 X
0.003 X
1
No
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