(meteorobs) Meteor Activity Outlook for June 11-17, 2016

[Paul Jones]

Thanks George.  Is that from the 278 +45 radiant position I saw mentioned?

On Sat, Jun 11, 2016 at 10:12 AM, george <gwgliba at gmail.com> wrote:

> Meteor Observers,
>
> Look for possible Xi Draconids discovered June 11/12, 1996 by Robert
> Lunsford,
> George Zay, and Marco Langbroek.
>
> Starry Skies,
> GWG
>
>
>
> > On Jun 10, 2016, at 2:36 PM, Robert Lunsford <lunro.imo.usa at cox.net>
> wrote:
> >
> > During this period the moon reaches its first quarter phase on Saturday
> June 11th. At this time the half-illuminated moon will lie 90 degrees east
> of the sun and will set soon after midnight for most locations located at
> mid-northern latitudes. As the week progresses the window of opportunity
> for viewing meteors in dark skies decreases with each passing night. Toward
> the end of the period the nearly full moon will lie above the horizon
> nearly all night long, making meteor observations difficult. The estimated
> total hourly meteor rates for evening observers this week is near 2 for
> observers located in the northern hemisphere and 3 for observers located in
> tropical southern locations (25S). For morning observers the estimated
> total hourly rates should be near 8 as seen from mid-northern latitudes
> (45N) and 12 as seen from tropical southern locations (25S). Evening rates
> are reduced during this period due to interfering moonlight. 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. Note that the hourly rates listed below are estimates as
> viewed from dark sky sites away from urban light sources. Observers viewing
> from urban areas will see less activity as only the brightest meteors will
> be visible from such locations.
> >
> > The radiant (the area of the sky where meteors appear to shoot from)
> positions and rates listed below are exact for Saturday night/Sunday
> morning June 11/12. 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 far 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.
> >
> > These sources of meteoric activity are expected to be active this week.
> >
> > The center of the large Anthelion (ANT) radiant is currently located at
> 18:16 (274) -23. This position lies in western Sagittarius, 3 degrees south
> of the 4th magnitude star known as Polis (mu Sagittarii).  Due to the large
> size of this radiant, Anthelion activity may also appear from the nearby
> constellations of Scutum, Serpens Caput, southern Ophiuchus, and
> southeastern Scorpius as well as Sagittarius. This radiant is best placed
> near 0200 local daylight saving (LDST), when it lies on the meridian and is
> located highest in the sky. Hourly rates at this time should be near 2 as
> seen from mid-northern latitudes and 3 as seen from tropical southern
> latitudes. With an entry velocity of 30 km/sec., the average Anthelion
> meteor would be of slow velocity.
> >
> > The Northern June Aquilids (NCZ) were discovered by Zdenek Sekanina
> through his Radio Meteor Project at Havana, Illinois. These meteors are
> active from June 10-26, which maximum activity occurring on the 16th. The
> current position of the radiant is 19:37 (294) -11. This position lies in a
> remote area of southern Aquila near the Sagittarius border. The nearest
> notable star is 3rd magnitude Algiedi (Alpha Capricorni), which lies 9
> degrees to the east. Rates, even at maximum, are expected to be less than 1
> per hour. With an entry velocity of 41 km/sec., the average Northern June
> Aquilid meteor would be of medium speed.
> >
> > The June Rho Cygnids (JRC) is a shower of short duration discovered by
> Damir Šegon and associates of the Croatian Meteor Network. These meteors
> are only active from June 14-16, with maximum activity occurring on the
> 14th. The radiant position at maximum lies at 21:22 (320) +45. This area of
> the sky lies in northeastern Cygnus, 4 degrees west of the 4th magnitude
> star known as rho Cygni. These meteors are best seen near during the last
> dark hour of the night when the radiant lies highest in a dark sky. These
> meteors are better seen from the northern hemisphere where the radiant
> rises higher into the sky before the start of morning twilight. Hourly
> rates, are expected to remain less than 1. With an entry velocity of 48
> kilometers per second, a majority of these meteors will appear to move with
> medium velocities. This shower is synonymous with shower #521 JRP in the
> IAU Meteor Catalog.
> >
> > The Pi Piscids (PPS) were discovered by Dr. Peter Brown in his meteoroid
> stream survey using the Canadian Meteor Orbit Radar. This shower was later
> verified by Dr. Peter Jenniskens and David Holman using data from the CAMS
> network in northern California. These meteors are active from June 11
> through July 25 with maximum activity occurring on July 1st. The current
> position of the radiant is 00:00 (000) +18. This position actually lies in
> southeastern Pegasus, 4 degrees northwest of the 3rd magnitude star known
> as Algenib (Gamma Pegasi). Rates are currently expected to be less than 1
> per hour no matter your location. With an entry velocity of 68 km/sec., the
> average Pi Piscid meteor would be of swift speed.
> >
> > The radiant for the Daytime Arietids (ARI) only lies 45 degrees west of
> the sun. Therefore these meteors can only be seen between the time the
> radiant rises and dawn. This is a small window of opportunity that lasts
> for about an hour before the break of dawn. Maximum activity for this
> shower was expected on June 7th. The current position of the radiant is
> 03:16 (049) +24. This position lies in eastern Aries, a little more than 5
> degrees west of the naked eye open star cluster known as the Pleiades or 7
> Sisters. Despite being a strong source of meteors, visual members of this
> shower are rare due to the low altitude of the radiant. If this radiant was
> better placed in the sky it would rival the better known Perseids of
> August. These meteors are the strongest source of radio meteors for the
> entire year. With an entry velocity of 42 km/sec., the average Daytime
> Arietid meteor would be of medium speed.
> >
> > As seen from the mid-northern hemisphere (45N) one would expect to see
> approximately 6 sporadic meteors per hour during the last hour before dawn
> as seen from rural observing sites. Evening rates would be near 1 per hour.
> As seen from the tropical southern latitudes (25S), morning rates would be
> near 9 per hour as seen from rural observing sites and 2 per hour during
> the evening hours. Locations between these two extremes would see activity
> between the listed figures. Evening rates during this period are reduced
> due to moonlight.
> >
> > The list below offers the information from above in condensed form.
> Rates and
> > positions are exact for Saturday night/Sunday morning except where noted
> in the
> > shower descriptions.
> >
> > Anthelion (ANT) -  17:48 (267) -23  Velocity - 30km/sec.
> > Northern Hemisphere - 2 per hr.   Southern Hemisphere - 3 per hr
> >
> > Northern June Aquilids (NCZ) -  19:37 (294) -11  Velocity - 41km/sec.
> > Northern Hemisphere - <1 per hr.   Southern Hemisphere - <1 per hr
> >
> > June Rho Cygnids (JRC) -  21:22 (320) +45  Velocity - 48km/sec.
> > Northern Hemisphere - <1 per hr.   Southern Hemisphere - <1 per hr
> >
> > Pi Piscids (PPS) -  00:00 (000) +18  Velocity - 68km/sec.
> > Northern Hemisphere - <1 per hr.   Southern Hemisphere - <1 per hr
> >
> > Daytime Arietids (ARI)        -  02:48 (042) +23  Velocity - 42km/sec.
> > Northern Hemisphere - 1 per hr.   Southern Hemisphere - <1 per hr
> >
> > Clear Skies!
> >
> > Robert Lunsford
> > American Meteor Society
> >
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