(meteorobs) RE: meteorobs Digest, Vol 4, Issue 51

[吴 吴昊]

Hello,excuse me.
"4. PER 2004 Form Tianjin China (=?gb2312?B?zuIgzuLquw==?=)"
i found a question in meteorobs Digest, Vol 4, Issue 51
i think your computer can't recognize my chinese name .
my name is wuhao(吴昊)
Thank you.
my english is not very good.
>From: meteorobs-request at meteorobs.org
>Reply-To: meteorobs at meteorobs.org
>To: meteorobs at meteorobs.org
>Subject: meteorobs Digest, Vol 4, Issue 51
>Date: 19 Aug 2004 14:36:41 -0700
>
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>Today's Topics:
>
>    1. Meteor Activity Outlook for August 20-26, 2004 (Robert Lunsford)
>    2. Geminid predictions? (Peter Brunone)
>    3. Re: Geminids (Meteorobs) (GLDSKTR at aol.com)
>    4. PER 2004 Form Tianjin China (=?gb2312?B?zuIgzuLquw==?=)
>    5. 2004 PER Form Tianjin China  (马强)
>    6. Re: Geminids (Meteorobs) (Skywayinc at aol.com)
>
>
>----------------------------------------------------------------------
>
>Message: 1
>Date: Thu, 19 Aug 2004 12:38:28 -0700
>From: "Robert Lunsford" <lunro.imo.usa at cox.net>
>Subject: (meteorobs) Meteor Activity Outlook for August 20-26, 2004
>To: "Meteorobs" < meteorobs at meteorobs.org>
>Message-ID: <001b01c48624$1a0534f0$5fff0744 at Lunsford>
>Content-Type: text/plain;	charset="iso-8859-1"
>
>This week will see the moon start to enter the morning sky late in the
>period. This weekend will still be an excellent time to view meteor
>activity as the moon will have set by midnight local daylight time. The 
moon
>reaches its first quarter phase on Monday August 23. At this time the moon
>lies ninety degrees east of the sun and will set near 0100 local daylight
>time. The estimated total hourly rates for evening observers this week
>should be near three for those in the Northern Hemisphere and one for 
those
>observers south of the equator. For morning observers the estimated total
>hourly rates should be near eighteen for those located in the Northern
>Hemisphere and twelve for those in the Southern Hemisphere. Evening rates
>are reduced due to moonlight. These rates assume that you are watching 
from
>rural areas away from all sources of light pollution. 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 listed below are exact for Saturday night/Sunday
>morning August 21/22. 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 libraries) 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 location. 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 last rise later in the night. This list also
>provides the order of ascending velocity for each radiant with those 
listed
>first usually being much slower than those last on the list. Velocity 
should
>not be the prime factor for shower association as all showers can produce
>slow meteors. Slow meteors can be produced from normally swift showers, 
such
>as the Leonids, when meteors appear near the radiant or close to the
>horizon. The true velocity is only revealed in shower members seen far 
from
>the radiant and high in the sky.
>
>These are the showers that may be observed this week:
>
>The Kappa Cygnids (KCG) are active from a wide radiant located at 19:04
>(286) +59. This position is located in southern Draco, six degrees 
northwest
>of the fourth magnitude star Kappa Cygni. Current rates would be near one
>shower member per hour. A large percentage of these meteors are bright,
>often fireball class meteors with brilliant colors. With an entry velocity
>of 25 km/sec. most of these meteors will appear to travel slower than
>average. The radiant is best placed near 2300 Local Daylight Time (11pm 
LDT)
>when it lies nearly overhead for much of the Northern Hemisphere. Due to 
its
>high northern declination this activity is not well seen from the Southern
>Hemisphere.
>
>The North Iota Aquarids (NIA) are active from a radiant currently located 
at
>21:56 (329) -06. This area of the sky is located in central Aquarius, five
>degrees east of the third magnitude star Sadalsuud (Beta Aquarii). Maximum
>activity occurs on August 19 with an expected ZHR of three. Current rates
>would be near two shower member per hour, depending on your latitude. At 
31
>km/sec. the NIA's are of average velocity. This radiant is most active 
near
>0100 LDT when it lies highest in the southern sky.
>
>The Anthelion radiant is now centered at 22:52 (343) -06. This area of the
>sky is located in central Aquarius, five degrees west of the fourth
>magnitude star Phi Aquarii Since this radiant is large and diffuse, any 
slow
>to medium speed meteor from eastern Capricornus, southwestern Pegasus,
>western Pisces or central Aquarius could be a candidate for this shower. 
The
>center of this area is best placed near 0100 local standard time when it
>lies on the meridian and is highest in the sky. At this time expect to see
>two shower members per hour  no matter your location.  At this time of 
year
>the Anthelion radiant overlaps both the North Delta Aquarid radiant and 
the
>Nouth Iota Aquarids so distinguishing between these showers will be
>difficult but not impossible if you face toward this general area of the
>sky.
>
>Unlike most of the annual showers the antihelion source is produced by
>debris from unknown objects orbiting in a direct motion like the earth.
>These objects are most likely asteroids, which produce stony and metallic
>debris whose density is much greater than material produced by comets. 
There
>is also the possibility that some of this activity may be caused by the
>"Jupiter family of comets", comets which have been altered by Jupiter's
>gravity into much shorter orbits. This material collides with the earth on
>the inbound portion of its orbit, before its closest approach to the sun.
>Therefore we best see them just after midnight when we are facing the
>direction from which this activity appears. The antihelion source is 
active
>all year from an area of the sky nearly opposite that of the sun. The 
center
>of this source will move approximately one degree eastward per day and
>travels through many different constellations over the course of a year. 
It
>may make sense to list these meteors as anthelions or "ANT" but a majority
>of meteor organizations prefer that you list them from the constellation 
in
>which the radiant is currently located or the constellation where the 
shower
>reaches maximum activity. At this time of year the IMO has no designation
>for the anthelion radiant as it overlaps several other radiants as it 
moves
>through Capricornus and Aquarius during July and August.
>
>The North Delta Aquarids (NDA) are currently active from a radiant located
>at 23:00 (345) -03. This area of the sky is located in western Pisces, 
five
>degrees south of the faint star Beta Piscium. This position is also close 
to
>the anthelion radiant and care must be taken to distinguish meteors from
>these sources. At 42 km/sec. the NDA's are a bit faster than the 
antihelion
>meteors. This radiant is most active between 0200 and 0300 LDT when it 
lies
>highest in the sky. Like many of the radiants active this time of year the
>NDA's are better seen from areas south of the northern tropics or 30 
degrees
>north latitude. With maximum activity occurring back on August 8, current
>hourly rates, seen from the southern tropics, would be near one per hour.
>
>The Pi Eridanids (ERI) are minor shower listed among the radiants of the
>Dutch Meteor Society. The peak activity is listed as August 27 with a ZHR 
of
>four. The current radiant position lies at 03:08 (047) -13, which places 
it
>in western Eridanus, four degrees southeast of the fourth magnitude star 
Eta
>Eridani. The radiant is best placed just before the start of morning
>twilight, when it lies highest above the horizon in a dark sky. At
>59km/sec., a majority of these meteors will move swiftly. Brighter shower
>members should produce trains.  The Gamma Doradids (GDO) are another 
obscure
>minor shower listed among the radiants of the Dutch Meteor Society. The 
peak
>activity is listed as August 30 with a ZHR of five. The current radiant
>position lies at 03:48 (057) -52, which places it in eastern Horologium 
some
>four degrees west of the 3rd magnitude star Gamma Dorado. Due to the 
extreme
>southern declination, this shower is only visible from the northern 
tropics
>southward. The radiant is best placed just before the start of morning
>twilight. At 41km/sec., these meteors are of average velocity.
>
>The Northern Apex radiant is now centered at 03:52 (058) +35. This 
position
>lies in southern Peresus, one degree southwest of the fourth magnitude 
star
>Xi Persei. This area of the sky is best placed for viewing during the last
>dark hour before dawn when it lies highest in the sky. Since this radiant 
is
>large and diffuse, any meteor from southern Perseus, northwestern Taurus,
>northern Aries or western Auriga could be a candidate from this source.
>Rates would be now close to three per hour for observers north of the
>equator and less than one per hour for those observers south of the 
equator.
>Observers who view far from this radiant must be careful not to list these
>meteors as late Perseids or early Alpha Aurigids.
>
>Like the anthelion area, both apex areas are active all year long and 
travel
>approximately one degree eastward per day. Unlike the anthelion debris,
>these particles orbit the sun in a retrograde motion opposite that of the
>earth and are most likely produced by unknown comets. They strike the 
earth
>after their closest approach to the sun. Since they are moving in opposite
>directions these particles strike the earth at tremendous velocities often
>creating bright meteors with persistent trains. These particles strike the
>earth on the morning side of earth and are best seen just before morning
>twilight while the sky is still perfectly dark. This is not really a
>"shower" per se, but an artificial radiant created by the Earth's motion
>through space. Meteors from both branches are normally included in the
>sporadic count. I feel it is a worthy project to see if it is possible to
>distinguish these meteors from the normal sporadic background. On rare
>occasions there are meteors with a zero inclination that radiate precisely
>from the apex point on the ecliptic, exactly 90 degrees west of the sun. 
In
>simplistic terms, these meteors are seldom seen since the Earth "sweeps
>clean" much of the material that shares the same orbit as our planet. Much
>more material is located just north and south of the earth's orbit with
>slightly higher or lower inclinations. This creates the northern and
>southern branches of the apex activity.
>
>The Southern Apex source lies exactly 30 degrees south of its northern
>counterpart at 03:52 (058) +05. This position lies in southwestern Taurus,
>fifteen degrees southwest of the first magnitude star Aldebaran (Alpha
>Tauri). Like the northern apex, these meteors are best seen toward dawn 
when
>the radiant lies highest above the horizon in a dark sky. Since this 
radiant
>is also large and diffuse, any meteor from eastern Cetus, southeastern
>Aries, western Orion, northwestern Eridanus or southern Taurus could be a
>candidate from this source. Rates would now be two per hour regardless of
>your location.
>
>The Perseids (PER) reached an impressive maximum on the morning of August
>12. Rates this weekend are continuing to fall as the Earth is moving away
>from the core of the Perseid material. Current rates would be near two per
>hour falling to less than one per hour later in this period. The current
>radiant position lies at 04:00 (060) +59, which is located in southern
>Camelopardalis, ten degrees northeast of the second magnitude star Mirfak
>(Alpha Persei). The radiant is well placed for those in the Northern
>Hemisphere during the last few hours before dawn. Due to the high northern
>declination (celestial latitude) of the radiant, rates seen from the
>Southern Hemisphere are very low or non-existent. At 59km/sec., Perseid
>meteors are usually swift, often exhibiting persistent trains.
>
>The Sporadic rates for the Northern Hemisphere are now increasing. One 
would
>expect to see perhaps eight random meteors per hour during the last hours
>before dawn from rural observing sites. This estimate and the morning
>estimate for the Southern Hemisphere do not include the apex meteors 
listed
>above. During the evening hours perhaps two random meteors can be seen per
>hour from the Northern Hemisphere. Rates seen from the Southern Hemisphere
>are now lower than those seen in the north with perhaps six random meteors
>being seen during the late morning hours and one per hour during the
>evening. Evening rates are reduced due to moonlight.
>
>Clear Skies!
>Robert Lunsford
>AMS Operations Manager
>
>
>------------------------------
>
>Message: 2
>Date: Thu, 19 Aug 2004 13:09:40 -0700
>From: "Peter Brunone" <peter at brunone.com>
>Subject: (meteorobs) Geminid predictions?
>To: <meteorobs at meteorobs.org>
>Message-ID: <87c2bbca648449f5875ddfbc40bf5bdc at brunone.com>
>Content-Type: text/plain;	charset=iso-8859-1
>
>
>    Is it too early to expect any of the heavyweights (or average folks) 
to have projected ZHRs for the Geminids?  I'd REALLY like to catch them 
this year -- hopefully we won't have clouds yet again -- and I was 
wondering if there are any semi-hard numbers that I can use to lure some 
other people in.
>
>Clear skies,
>
>Peter
>
>
>
>
>------------------------------
>
>Message: 3
>Date: Thu, 19 Aug 2004 17:01:42 EDT
>From: GLDSKTR at aol.com
>Subject: Re: Geminids (Meteorobs)
>To: meteorobs at meteorobs.org
>Message-ID: <d.3059a1e1.2e566f36 at aol.com>
>Content-Type: text/plain; charset="us-ascii"
>
>I am also planning on catching them this year. I would like to know if the
>peak night is Dec 11-12, or 12-13. I'll be able to take the day off work 
to
>be
>out all night.
>Thanks,
>Anthony
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>------------------------------
>
>Message: 4
>Date: Thu, 19 Aug 2004 15:09:38 +0800
>From: =?gb2312?B?zuIgzuLquw==?= <wuhao5319 at hotmail.com>
>Subject: (meteorobs) PER 2004 Form Tianjin China
>To: visual at imo.net
>Cc: meteorobs at meteorobs.org
>Message-ID: <BAY16-F33rIEDFVMBkW0000f513 at hotmail.com>
>Content-Type: text/plain; charset=gb2312; format=flowed
>
>IMO Visual Observing Form
>
>Visual Observing Form - Summary Report
>Day: 18/19 Month: 08 Year: 2004        Begin: 18h30m   End: 19h30m UT
>Location long. 117°27'02" latit. 39°18' 01" height 10 m
>Site: Qilihai, Ninghe, Tianjin, CHINA   Country: CHINA
>Observer: Hao WU  IMO code:
>
>Showers:
>  
-------------------------------------------------------------------------
>| Shw |alpha|delta| Shw |alpha|delta| Shw  |alpha|delta| Shw  
|alpha|delta|
>|-------------------------------------------------------------------------|

>| PER | 055 | +59 | NDA | 342 | -3  | NIA  | 326 |  -5 |      |     |     
|
>  
-------------------------------------------------------------------------
>
>
>    
-----------------------------------------------------------------------
>   | Period  |Field  |Teff| F | lm | PER| NDA| NIA| ___| ___| ___| 
___|Spor|
>   |  (UT)   |RA  Dec|  h |   | m  |M| N|M| N|M| N|M| N|M| N|M| N|M| N|M| 
N|
>   
|-----------------------------------------------------------------------|
>  1|1830-1930|45 |+50|  1 |1.0|5.56|c| 3|c| 1|c| 1| |  | |  | |  | |  |c|6 
|
>   
|---------|---|---|----|---|----|-|--|-|--|-|--|-|--|-|--|-|--|-|--|-|--|
>
>
>  
-------------------------------------------------------------------------
>|Shower  |-6|-5|-4|-3| -2| -1 |  0 | +1 | +2 | +3 | +4 | +5 | +6 | +7| 
tot|
>|--------|--|--|--|--|---|----|----|----|----|----|----|----|----|---|----|

>| PEG    | -| -| -| -|  -|   -| 2  |  - | 1  |  - |  - |  - |  - |  -| 3  
|
>|--------|--|--|--|--|---|----|----|----|----|----|----|----|----|---|----|

>| NDA    | -| -| -| -|  -|   -|  - |  - |  - | 1  |  - |  - |  - |  -| 1  
|
>|--------|--|--|--|--|---|----|----|----|----|----|----|----|----|---|----|

>| NIA    | -| -| -| -|  -|   -|  - |  - |  - | 1  |  - |  - |  - |  -| 1  
|
>|--------|--|--|--|--|---|----|----|----|----|----|----|----|----|---|----|

>|spor.   | -| -| -| -|  -|   -| 1  |  - | 2  | 3  |  - |  - |  - |  -| 6  
|
>|--------|--|--|--|--|---|----|----|----|----|----|----|----|----|---|----|

>
>Thanks.
>
>_________________________________________________________________
>免费下载 MSN Explorer:   http://explorer.msn.com/lccn
>
>
>------------------------------
>
>Message: 5
>Date: Thu, 19 Aug 2004 15:12:09 +0800 (CST)
>From: "马强"<meteorobs at people.com.cn>
>Subject: (meteorobs) 2004 PER Form Tianjin China
>To: meteorobs at meteorobs.org
>Message-ID: <2Z959180848790.15854 at mail02>
>Content-Type: text/plain
>
>
>
>Visual Observing Form - Summary Report
>Day:17/18  Month:8 Year:2004 Begin: 18h40m (UT) End: 19h40m(UT)
>
>Location long. 117°27'02" latit. 39°18' 01" height: 10m
>
>Site: Qilihai, Tianjin Country: China
>Observer: Qiang MA
>Surname (family name) with CAPITAL LETTERS; only SINGLE PERSONS
>
>Showers:
>  
-------------------------------------------------------------------------
>| Shw |alpha|delta| Shw |alpha|delta| Shw  |alpha|delta| Shw  
|alpha|delta|
>|-------------------------------------------------------------------------|

>| PER | 054 | +59 | NIA | 324 | -06 | NDA  | 341 | -03 |      |     |     
|
>  
-------------------------------------------------------------------------
>
>-----------------------------------------------------------------------
>   | Period  |Field  |Teff| F | lm | PER| NIA| NDA| ___| ___| ___| 
___|Spor|
>   |  (UT)   |RA  Dec|  h |   | m  |M| N|M| N|M| N|M| N|M| N|M| N|M| N|M| 
N|
>   
|-----------------------------------------------------------------------|
>  1|1840-1940|30|+20 |1.00|1.0|5.49|c|7 |c|2 |c|2 | |  | |  | |  | |  |c|1 
|
>    
-----------------------------------------------------------------------
>
>
>  
-------------------------------------------------------------------------
>|Shower  |-6|-5|-4|-3| -2| -1 |  0 | +1 | +2 | +3 | +4 | +5 | +6 | +7| 
tot|
>|--------|--|--|--|--|---|----|----|----|----|----|----|----|----|---|----|

>|PER     | -| -| -| 1| - |  2 |  - |  1 |  2 |  1 | -  | -  | -  | - | 7  
|
>|--------|--|--|--|--|---|----|----|----|----|----|----|----|----|---|----|

>|NIA     | -| -| -| -| - |  - |  - |  1 |  - |  1 |    |  - |  - | - | 2  
|
>|--------|--|--|--|--|---|----|----|----|----|----|----|----|----|---|----|

>|NDA     | -| -| -| -| - |  - |  1 |  - |  1 |  - |  - | -  | -  | - | 2  
|
>|--------|--|--|--|--|---|----|----|----|----|----|----|----|----|---|----|

>|spor.   | -| -| -| -| - |  - |  - |  - |  1 |  - |  - |  - |  - | - | 1  
|
>
>Reverse of the Visual Observing Form
>
>Interval from 1840 to 1940
>
>  -----------------------------------------------
>|Time   | Nr | N  | lm |Time   | Nr | N  | lm |
>|---------------------------------------------|
>| 1840  | 6  | 06 |5.49| 1940  | 6  | 06 |5.49|
>-----------------------------------------------
>
>Mean limiting magnitude Lm: 5.49(same as on summary report)
>
>  -------------------------------------------         ----------------
>| Obscured Field | %  | Obscured Field | %  |       |      Breaks    |
>|-------------------------------------------|       |----------------|
>| 18:40to 1940   |  0 | _____ to _____ | __ |       |      0         |
>  -------------------------------------------         ----------------
>  K= 0, F=1/(1-K)= 1  (same as on summary report)
>
>Time for plotting: 0 sec/meteor, 0 m total, Breaks: 1 m total.
>Net observed time Teff= 67 m = 1.11 h (same as on summary report.
>
>Detail Information for observed meteors:
>
># TIME(UT) MAG VEL. COLOR SHOWER TRAIN MAP ACCURACY
>---------------------------------------------------------------------
>
>1  1846     -1   5    Y    PER
>2  1851      2   5    w    SPO
>3  1854      2   4    w    PER
>4  1854     -3   2    Y    PER
>5  1856      1   4    w    NIA
>6  1900      3   3    w    PER
>7  1903      1   5    w    PER
>8  1906      3   4    w    NIA
>9  1920      0   5    Y    NDA      2s
>10 1932      2   5    w    NDA
>11 1938      2   4    w    PER
>12 1940     -1   4    Y    PER
>VELOCITY (VEL.) SCALE:
>0 = Stationary
>1 = Very Slow
>2 = Slow
>3 = Medium
>4 = Fast
>5 = Very Fast
>
>---------------------------------------------------------------------
>REMARKS:
>
>---------------------------------------------------------------------
><END OF REPORT>
>
>
>
>
>
>
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>------------------------------
>
>Message: 6
>Date: Thu, 19 Aug 2004 17:33:28 EDT
>From: Skywayinc at aol.com
>Subject: Re: Geminids (Meteorobs)
>To: meteorobs at meteorobs.org
>Message-ID: <1db.295363f3.2e5676a8 at aol.com>
>Content-Type: text/plain; charset="us-ascii"
>
>In a message dated 8/19/2004 5:04:09 PM Eastern Daylight Time,
>GLDSKTR at aol.com writes:
>I am also planning on catching them this year. I would like to know if the
>peak night is Dec 11-12, or 12-13. I'll be able to take the day off work 
to
>be
>out all night.
>Actually, according to the RASC Handbook, the 2004 peak is predicted to 
occur
>at around 22h UT on December 13, which means that the night of December 
13-14
>(Monday night/Tuesday morning) will be when Geminid activity will be most
>prolific.  Hourly rates tend to be about 1/4 of the peak numbers on the 
two
>nights prior to . . . and the night immediately after the peak.  Take note 
that
>because the Geminid radiant (near the star Castor) passes almost directly
>overhead at around 2 a.m. local time, the actual visual activity should be 
very close
>to the oft-quoted ZHR (Zenithal Hourly Rate).
>
>Depending on how keen your perception is . . . how dark your observing 
site .
>. . and how much of the sky you can see . . . peak rates could range 
anywhere
>from 60 to 120 per hour.
>
>One last point . . . Geminid meteors that are seen up until the peak are
>generally rather faint.  But once the peak is reached, the incidence of 
bright
>meteors and fireballs tends to noticeably increase.
>
>-- joe rao
>
>
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>------------------------------
>
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