Meteor Activity Outlook for November 14-20, 2009

As seen from the northern hemisphere, meteor rates
continue to be strong in November. While no major showers are active this month,
the two Taurid radiants plus the Leonids keep the skies active. The addition of
strong sporadic rates make November one of the better months to view meteor
activity from north of the equator. Skies are fairly quiet as seen from the
southern hemisphere this month. Activity from the three showers mentioned above
may be seen from south of the equator, but the sporadic rates are much lower than
those seen in the northern hemisphere.

During this period the moon reaches its new
phase on Monday November 16th. On that date the moon lies close to the sun and
is not visible at night. The same circumstances exist for this weekend. As the
week progresses the waxing crescent moon will enter the evening sky but still set
well before the active morning hours arrive. The estimated total hourly rates for
evening observers this week is near five as seen from the northern hemisphere and
three from the southern hemisphere. For morning observers the estimated total hourly
rates should be near twenty-two from the northern hemisphere and ten as seen from
the southern hemisphere. The actual rates will also depend on factors such as
personal light and motion perception, local weather conditions, alertness and
experience in watching meteor activity.

The radiant positions and rates listed below are exact
for Saturday night/Sunday morning November 14/15. These positions do not change
greatly day to day so the listed coordinates may be used during this entire period.
Most star atlases (available at science stores and planetariums) will provide
maps with grid lines of the celestial coordinates so that you may find out exactly
where these positions are located in the sky. A planisphere or computer planetarium
program is also useful in showing the sky at any time of night on any date of the
year. Activity from each radiant is best seen when it is positioned highest in the
sky, either due north or south along the meridian, depending on your latitude. It
must be remembered that meteor activity is rarely seen at the radiant position.
Rather they shoot outwards from the radiant so it is best to center your field of
view so that the radiant lies at the edge and not the center. Viewing there will
allow you to easily trace the path of each meteor back to the radiant (if it is
a shower member) or in another direction if it is a sporadic. Meteor activity is
not seen from radiants that are located below the horizon. The positions below
are listed in a west to east manner in order of right ascension (celestial longitude).
The positions listed first are located further west therefore are accessible earlier
in the night while those listed further down the list rise later in the night.

The following showers are expected to be active this week:

Sirko Molau’s studies of video radiants has revealed that activity from the famous
Andromedid shower, noted for intense storms during the 19th century, may
still be seen throughout November. The current position of the large radiant is
01:33 (023) +33. This position lies near the intersection of the constellations of
Pisces, Triangulum, and Andromeda. The nearest bright star is second magnitude Mirach
(Beta Andromedae), which lies four degrees to the northwest. Visual activity is
expected to be low, but detectable. The Andromedid radiant is best placed near 2200
(10pm) local standard time (LST) when it lies on the meridian. At 19km/sec., the
average Andromedid will appear as a very slow moving meteor. Sirko mentions that
these meteors are “conspicuously slow and of almost constant activity” during this
period.

Another shower verified by video means are the Omicron Eridanids (OER).
This shower is active from November 13-20 with maximum activity occurring on the
14th. The radiant is currently located at 04:02 (060) -02. This position lies in
eastern Eridanus, fifteen degrees northwest of zero magnitude Rigel (Beta Orionis)
and eight degrees south of fourth magnitude star Nu Tauri. The radiant is best placed
near 0100 LST, when it lies highest above the horizon. Current rates would be less
than one per hour. At 27km/sec., the average Omicron Eridanid is slow.

The Northern Taurids (NTA) are active from a large radiant centered at 04:06
(061) +23, which lies in western Taurus, four degrees southeast of the famous naked
eye star cluster known as the Pleiades. The radiant is best placed near 0100 LST,
when it lies highest above the horizon, but activity may be seen all night long.
Meteors from the Northern Taurids strike the atmosphere at 29km/sec., which would
produce meteors of slow velocity. Expected rates would be near three per hour as
seen from the northern hemisphere and two per hour as seen south of the equator.

The center of the large Southern Taurid (STA) radiant lies at 04:09 (062)
+15. This position lies in western Taurus, five degrees southwest of the first
magnitude orange star Aldebaran (Alpha Tauri). The radiant is best placed near 0100 LST,
when it lies highest above the horizon, but activity may be seen all night long.
Striking the atmosphere at 29 km/sec., the average Southern Taurid meteor travels
slowly through the skies. Rates should be near one per hour no matter your location.

The November Orionids (NOO) were recently discovered by analyzing video data.
This shower is active from November 18 through December 9. Maximum activity occurs
on November 30. The radiant is currently (11/18) located at 05:32 (083) +16. This
position lies on the Orion/Taurus border, six degrees north of the third magnitude
star Lambda Orionis. These meteors are also best seen
near 0300 LST when the radiant lies on the meridian and highest above the horizon.
At 44 km/sec. the November Orionids produce mostly medium velocity meteors.

The Alpha Monocerotids (AMO) are active from November 15-25, with maximum
occurring on the 21st. This shower has produced outbursts in the past but none are
expected for many years to come. Rates are expected to be less than one shower
member per hour, even on the night of maximum activity. The radiant is currently
located at 07:28 (112) +02. This position lies in central Canis Minor, only three
degrees southwest of the zero magnitude star Procyon (Alpha Canis Minoris). These
meteors are also best seen near 0500 LST when the radiant lies highest above the
horizon in a dark sky. At 65 km/sec. the Alpha Monocerotids produce mostly swift
meteors.

The Leonids (LEO) reach maximum activity on the morning of November 17th.
The Leonids possess a sharp peak of short duration. These peaks in activity are
caused by the Earth passing close to one of the filaments of material produced
by comet 55P Temple-Tuttle. This year the Earth passes close to the several filaments.
Between 2100 and 2200 Universal Time (UT) on November 17th, the Earth is expected
to pass through three filaments that were produced by 55P Temple-Tuttle in 1466
and 1533. This timing is best for those watching from central Asia. A fairly strong
traditional maximum is also expected near 0900 UT, which is well timed for North
America. This corresponds to 0400 EST, 0300 CST, 0200 MST, and 0100 PST on the
morning of the 17th. The radiant is currently located at 10:09 (152) +23. This
position lies in western Leo, just west of the third magnitude star Zeta Leonis.
Rates this weekend are expected to be near one per hour. At 70km/sec., the average
Leonid is swift with a high percentage of trains. The radiant does not rise until
the late evening hours so it is advised to wait until after midnight before beginning
serious observations. The radiant is most favorably located during the last dark
hour before the onset of morning twilight when it lies highest in a dark sky.

As seen from the mid-northern hemisphere (45N) one would expect to see approximately
sixteen Sporadic meteors per hour during the last hour before dawn as seen
from rural observing sites. Evening rates would be near four per hour. As seen from
the mid-southern hemisphere (45S), morning rates would be near six per hour as seen
from rural observing sites and two per hour during the evening hours. Locations
between these two extremes would see activity between the listed figures.

The table below presents a condensed version of the expected activity this week.
Rates and positions are exact for Saturday night/Sunday morning but may be used
all week long.

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Meteor Showers Calendar

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This shower is much like the Southern Taurids, just active a bit later in the year. When the two showers are active simultaneously in late October and early November, there is sometimes an notable increase in the fireball activity. There seems to be a seven year periodicity with these fireballs. 2008…

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WGN, The IMO journal

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