(meteorobs) Re: meteorobs Digest, Vol 28, Issue 18

Nadka Dankova nadka_astronomy at abv.bg
Sat Aug 12 15:15:23 EDT 2006


My Visual Observing Report.Nadka Dankowa



>-------- Оригинално писмо --------
>От: meteorobs-request at meteorobs.org
>Относно: meteorobs Digest, Vol 28, Issue 18
>До: meteorobs at meteorobs.org
>Изпратено на: Събота, 2006, Август 12 19:00:18 EEST
>----------------------------------
>
>Send meteorobs mailing list submissions to
> meteorobs at meteorobs.org
>
>To subscribe or unsubscribe via the World Wide Web, visit
> http://lists.meteorobs.org/mailman/listinfo/meteorobs
>or, via email, send a message with subject or body 'help' to
> meteorobs-request at meteorobs.org
>
>You can reach the person managing the list at
> meteorobs-owner at meteorobs.org
>
>When replying, please edit your Subject line so it is more specific
>than "Re: Contents of meteorobs digest..."
>
>
>Today's Topics:
>
> 1. Re: The Perseids of 1991-1994 - so what *were* the maximum
> ZHRs? (Marco Langbroek)
> 2. Re: Perseids (Arlene Carol)
> 3. Re: "The 2007 September 1 Aurigid Meteor Storm"!?
> (Marco Langbroek)
> 4. Perseids and Perspective (Bruce McCurdy)
> 5. observations of the 11/08/2006 from Slovakia (Cs?rgei Tibor)
>
>
>----------------------------------------------------------------------
>
>Message: 1
>Date: Sat, 12 Aug 2006 11:59:43 +0200
>From: Marco Langbroek  
>Subject: Re: (meteorobs) The Perseids of 1991-1994 - so what *were*
> the maximum ZHRs?
>To: Global Meteor Observing Forum  
>Message-ID:  
>Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
>
>
>Daniel Fischer wrote:
>
>> There is also a cryptical statement in § 3.1: "The reported rates by Brown & Rendtel were
>> corrected by +15 per cent in order to match the ZHR scale of Jenniskens" - I thought the
>> ZHR formula was clearly defined
>
>Hi Danniel,
>
>No. There is no such thing as "the" ZHR formula. Factors in versions of the 
>formula are under discussion. For example, use a gamma exponent of 1.0 or 1.4 
>for radiant altitude correction? How exactly is the r-value defined? Some 
>versions employ calibration of individual observer rates to a standard observer 
>(the Cp factor), some don't.
>
>> and without personal fudge factors? 
>
>The difference is largely in the gamma value in radiant altitude correction. IMO 
>uses 1.0, DMS 1.4.
>
>The DMS method (the one Peter J. employs) also makes use of a calibration of 
>individual observers to a "standard" observer, defined as one that would see 10 
>sporadics/hour in mid August around local midnight with Lm at +6.5.
>
>There are also differences in te r-value definition.
>
>All together, the effect is that IMO ZHR's are usualy a factor 0.15 to 0.25 
>higher than DMS ZHR's
>
> > And how do you define 'ZHR max'
>> anyway: How much and precisely how are the counts smoothed?
>
>I think Peter J. uses trendline fits to the unsmoothed data (as did I when I 
>still made active analysis) to determine peak levels.
>
>- Marco
>
>-----
>Dr Marco Langbroek
>Dutch Meteor Society (DMS)
>
>e-mail: meteorites at dmsweb.org
>private website http://home.wanadoo.nl/marco.langbroek
>DMS website http://www.dmsweb.org
>-----
>
>------------------------------
>
>Message: 2
>Date: Sat, 12 Aug 2006 13:05:40 +0300
>From: "Arlene Carol"  
>Subject: Re: (meteorobs) Perseids
>To: "Global Meteor Observing Forum"  
>Message-ID:
>  
>Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
>Hi Bruce
>
>Thank you for these kind words. I've come to accept my role here as someone
>bringing a new and different perspective to my neighbors. Some seem to be
>living in a different century than most of us. I just had this discussion
>with my closest neighbor here this morning..actually, we were talking about
>'dress codes' for the ladies as opposed to the way men are allowed to appear
>in public especially in hot summer months.
>
>I also wanted to mention that I've learned of a young man in a village
>about 45 minutes from here who is a shephard but is an AVID
>astronomer...he is poor, as one might expect and has built his own
>telescope! I hope to meet him in the coming weeks to see what he's done and
>learn how much he really knows about the heavens. He needs some encouraging
>I think...young people like this are as rare as 'point meteors' !! ;-))
>
>As for what we saw...it was a brief flash so it was probably a flare...even
>though it was in the radiant...
>
>I do want to tell you about a very strange set of meteors I observed 5 years
>ago from my other house in this region prior to restoring this house and
>moving here. My other house was closer to the Aegean (i'm 10 KM inland here)
>and the roof of the house was flat so on observing nights, i was able to go
>up to the roof and watch with a spectacular 360* viewing area...and that was
>before they installed street lights so it was quite a good observatory.
>
>it was during the 2000 Perseid Shower...i don't recall how long i was
>outside but i saw an 'earth grazer' to my left.. a very long almost
>horizontal meteor with a long train. Within 5 minutes, i saw it's
>'mirror-image' off to my right! i was very surprised at this. nearly
>identical meteors, 5 minutes apart.
>one to my left, one to my right...it was quite exciting. unfortunately,
>there was no one around to share my excitement with!
>
>thanks again for your kind words. they encourage me to continue ...
>
>Arlene & Co.
>south of Troy
>
>On 8/12/06, Bruce McCurdy  wrote:
>>
>> Arlene south of Troy wrote:
>>
>> > this isn't too 'scientific' (i'm intimidated by all of you with a lot
>> more
>> > skill at this than i possess) but i wanted to feed in our observations.
>> > since coming to this part of the world, i've been 'influencing' the
>> local
>> > shephards and they too are now gazing skywards more often and reporting
>> > back
>> > to me. since they spend most of the night outside, they see more on a
>> > regular basis than i do...
>>
>> Arlene, if "all" you have done is influence others to look skywards,
>> you
>> should be proud of an important accomplishment, whether it's "scientific"
>> or
>> not. With the greatest of due respect to science, there is much more to
>> this
>> life and this Universe than *just* science. As your shepherd friends well
>> know.
>>
>> > i saw two 'flashes' of light that were either 'head on' meteors or
>> > satellites...hard to tell since the moon was rising...they only briefly
>> > lite
>> > up in the night sky. i would have thought that a bollide would be much
>> > brighter...i guess i'll know when i see one, right?
>>
>> In my experience point meteors are rare; I've logged probably 5000
>> meteors over the past two decades, and I'd say fewer than 10 of them were
>> true point meteors. (Anecdotes welcome, statistics to back them up even
>> more
>> so.) The chance of seeing two of them is remote. Were they on the radiant?
>> Or is it more likely they were Iridium flares? How long did these flashes
>> last?
>>
>> Cloudy/rainy here in Edmonton but the forecast for Saturday
>> night/Sunday
>> morning (6-12 hours beyond the peak) is encouraging. I'm looking forward
>> to
>> recording at least some non-zero number of meteors for the 19th
>> consecutive
>> August 12.
>>
>> Bruce
>> *****
>>
>> ---
>> Mailing list meteorobs: meteorobs at meteorobs.org
>> To UNSUBSCRIBE, email: owner-meteorobs at meteorobs.org
>> http://lists.meteorobs.org/mailman/listinfo/meteorobs
>>
>
>------------------------------
>
>Message: 3
>Date: Sat, 12 Aug 2006 12:11:30 +0200
>From: Marco Langbroek  
>Subject: Re: (meteorobs) "The 2007 September 1 Aurigid Meteor Storm"!?
>To: Global Meteor Observing Forum  
>Message-ID:  
>Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
>
>
>Daniel Fischer wrote:
>> On August 18 from 16:00 to 16:05 Peter Jenniskens will make an announcement at the
>> General Assembly of the International Astronomical Union in Prague about an
>> "Aurigid Meteor Storm, 1 September 2007" (in an earlier Version of the website -
>> http://www.astronomy2006.com/special-sessions-hot-topics.php - it actually said
>> "The 2007 September 1 Aurigid Meteor Storm", as if it were an absolute fact).
>> Has anyone heard about such a prediction? If you google for "Aurigid Meteor Storm"
>> you get exactly one hit: the website mentioned above ...
>> 
>> Daniel
>
>Hi Daniel,
>
>You can find it here:
>
>* Lyytinen E., Jenniskens P.: Meteor outbursts from long-period comet dust 
>trails. Icarus, Volume 162 (2003), Issue 2, p. 443-452
>
>* Meteor Showers and their Parent Comets, by Peter Jenniskens, pp. . ISBN 
>0521853494. Cambridge, UK: Cambridge University Press, 2006.
>
>- Marco
>
>-----
>Dr Marco Langbroek
>Dutch Meteor Society (DMS)
>
>e-mail: meteorites at dmsweb.org
>private website http://home.wanadoo.nl/marco.langbroek
>DMS website http://www.dmsweb.org
>-----
>
>------------------------------
>
>Message: 4
>Date: Sat, 12 Aug 2006 04:28:38 -0600
>From: "Bruce McCurdy"  
>Subject: (meteorobs) Perseids and Perspective
>To: "Global Meteor Observing Forum"  
>Message-ID:  
>Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=response
>
>> Thank you for these kind words. I've come to accept my role here as 
>> someone
>> bringing a new and different perspective to my neighbors.
>
> That is a role a lot of astronomers play, one way or another. :) And 
>frankly, with the insanity down here on the surface -- not to mention at 
>cruising altitude -- the world could use a Universe worth of perspective, so 
>it is an important role that none of us should sell short.
>
>> I also wanted to mention that I've learned of a young man in a village
>> about 45 minutes from here who is a shephard but is an AVID
>> astronomer...he is poor, as one might expect and has built his own
>> telescope! I hope to meet him in the coming weeks to see what he's done 
>> and
>> learn how much he really knows about the heavens. He needs some 
>> encouraging
>> I think...young people like this are as rare as 'point meteors' !! ;-))
>
> Great story. I'd like to hear about your meeting when it happens; if you 
>think it's off-topic, mail me off-list.
>
>> As for what we saw...it was a brief flash so it was probably a 
>> flare...even
>> though it was in the radiant...
>
> Iridium "flares" tend to last for a couple to several seconds, like 
>they're on some a slow-motion cosmic dimmer switch. And one can often see a 
>satellite of normal brightness coming and going before/after the flare. If 
>what you saw was both brief *and* in the radiant, maybe you did see a point 
>meteor. Or was it two?
>
>> thanks again for your kind words. they encourage me to continue ...
>
> You are most welcome, Arlene. I have *always* enjoyed reading your 
>reports.
>
> Bruce
> *****
>
>
>------------------------------
>
>Message: 5
>Date: Sat, 12 Aug 2006 16:44:28 +0200
>From: "Cs?rgei Tibor"  
>Subject: (meteorobs) observations of the 11/08/2006 from Slovakia
>To: "Rainer"  , "IMO"  ,
> meteorobs at meteorobs.org, meteors at comcast.net, namn at namnmeteors.org
>Message-ID:  
>Content-Type: text/plain; charset="iso-8859-1"
>
>
>
>
>
> Visual Observing Form - Summary Report
> Observer name: Csцrgei Tibor
> Name code: CSOTI
> Day: 11 Month: 08 Year: 2006 Begin: 21:06 (UT) End: 21:26(UT)
> Location : Bellova Ves, Sk code 23740
> Site: Blahova 54, Country : Slovakia
> method: visual
>
> Showers:
> ------------------
> | Shw |alpha|delta|
> |------------------
> | Per | 046 | 58 |
>
> ------------------
> ----------------------------------------------------------------
> | Period |Field |Teff | F | lm | Per | Spor|
> | (UT) |RA Dec| h | | m |M| N|M| N | 
> |-------------------------------------------------------------------------------------------|
> 1|2106-2126| 020| 50 |0.67|1.0| 5.3|c|03 |c| 00|
> --------------------------------------------------------------
> 
> |Shower |-7 | -6 | -5 | -4 | -3 | -2 | -1 | 0 | +1 | +2 | +3 | +4 | +5 | +6| tot|
> |PER | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 2 | 0 | 0 | 0 | 3 |
> |spor. | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
> ---------------------------------------------------------------------------
> Time distribution:
>
> 21:08:35 3 5
> 21:15:30 -2 15
> 21:18:19 3 10
> From Skywayinc at aol.com Sat Aug 12 15:38:02 2006
>Return-Path:  
>Delivered-To: 8-meteorobs at meteorobs.org
>Received: (qmail 27462 invoked from network); 12 Aug 2006 11:38:02 -0400
>Received: from imo-d05.mx.aol.com (205.188.157.37)
> by sedna.atmob.org with SMTP; 12 Aug 2006 11:38:02 -0400
>Received: from Skywayinc at aol.com
> by imo-d05.mx.aol.com (mail_out_v38_r7.6.) id a.bbb.4061973 (63024)
> for  ; Sat, 12 Aug 2006 11:37:26 -0400 (EDT)
>From: Skywayinc at aol.com
>Message-ID:  
>Date: Sat, 12 Aug 2006 11:37:25 EDT
>Subject: Re: (meteorobs) "The 2007 September 1 Aurigid Meteor Storm"!?
>To: meteorobs at meteorobs.org
>MIME-Version: 1.0
>Content-Type: text/plain; charset="US-ASCII"
>Content-Transfer-Encoding: 7bit
>X-Mailer: AOL 4.0 for Windows 95 sub 10
>X-Spam-Flag: NO
>X-BeenThere: meteorobs at meteorobs.org
>X-Mailman-Version: 2.1.1
>Precedence: list
>Reply-To: Global Meteor Observing Forum  
>List-Id: Global Meteor Observing Forum  
>List-Unsubscribe:  ,
>   
>List-Archive:  
>List-Post:  
>List-Help:  
>List-Subscribe:  ,
>  
>
>In a message dated 8/11/06 9:09:52 PM Eastern Daylight Time, 
>dfischer at astro.uni-bonn.de writes:
>
><< On August 18 from 16:00 to 16:05 Peter Jenniskens will make an 
>announcement at the General Assembly of the International Astronomical Union in Prague 
>about an
>"Aurigid Meteor Storm, 1 September 2007" (in an earlier Version of the 
>website -
>http://www.astronomy2006.com/special-sessions-hot-topics.php - it actually 
>said
>"The 2007 September 1 Aurigid Meteor Storm", as if it were an absolute fact).
>Has anyone heard about such a prediction? If you google for "Aurigid Meteor 
>Storm"
>you get exactly one hit: the website mentioned above ... >>
>
>Daniel (and everyone else) --
>
> In their 2002 Icarus paper, "Meteor Outbursts from Long Period Comet Dust 
>Trails," Esko Lyytinen and Peter Jenniskens cite the Theta Aurigid shower, 
>which peaks on September 1. The meteors with this display are apparently 
>associated with Comet Kiess (C/1911 N1) which has a period of roughly 2,000-years. 
>Outbursts of this shower were reported in 1935, 1986 and 1994. 
>
>In this paper, there is this comment: 
>
>"The next Theta Aurigid outburst is due in 2007, and is expected to be a 
>spectacularly rich shower of bright +0 to +2 magnitude meteors. (Jenniskens, 
>1997)."
>
> Unfortunately, in the accompanying Table I, which provides a working list 
>of far-comet type outbursts, the specific information regarding the Theta 
>Aurigids is hidden (at least in the on-line .pdf version), because it falls too 
>close to the break between pages. One cannot deduce, for example, the miss 
>distance of the associated comet stream from the Earth's orbit or the solar 
>longitude value of the predicted peak. :(
>
> To me, a meteor "outburst" is a sudden surge -- usually short-lived 
>period -- of enhanced meteor activity. A rapid rise from virtually nothing, to a 
>ZHR of, say, a few hundred or more can qualify as an "outburst." 
>
>A meteor "storm," however, implies (to me) a ZHR of at least 1,000 or more. 
>
> It is interesting to me, that this 2007 Aurigid display was originally 
>promoted as an "outburst" in the Icarus paper . . . and now apparently will be 
>upgraded to potential "storm" status in Dr. Jenniskens announcement at the IAU 
>Conference in Prague in just a few days. I'm sure we all are anxiously 
>awaiting his conclusions.
>
> But not to throw cold water on this . . . I think it is only fair to 
>point out that on September 1, 2007, the Moon will be residing in the neighboring 
>constellation of Aries and will be only four days past Full phase. In fact . 
>. . just before 10 p.m. local daylight time that evening, as Capella is rising 
>in the NNE, the Moon will also be rearing its head above the ENE horizon. 
>Anyone who might wonder what effect such a Moon might have on observing a meteor 
>display with potentially bright shower members need only step outside tonight 
>to watch for the predicted Perseid peak; for tonight's lunar phase will be 
>approximately the same as it will be on September 1 of next year!
>
>-- joe rao 
>
> 
>
>------------------------------
>
>---
>meteorobs at meteorobs.org
>To UNSUBSCRIBE or EDIT OPTIONS on meteorobs
>http://lists.meteorobs.org/mailman/listinfo/meteorobs
>
>
>End of meteorobs Digest, Vol 28, Issue 18
>*****************************************
>   
-------------- next part --------------
To:   meteorobs at meteorobs.org 

Visual Observing Report
Day: 11/12  Month: 08 ; Year:2006
Location:Bulgaria;Troyan, Long: 240 42? 49?
                                            Latit:  420 53? 08?
Elevation:480 m
From:Nadka Dankova,AO ?Johan Kepler?,Troyan
http://www.astronomy-guidebook.hit.bg 
Magnitude distribution:
20:30 UT ? 21:30 UT; NW ;clear sky; average limiting magnitude: 4,82
Total meteors:7
Per: 4
Spor:3
Time  Mag.  Type
20:35    3      Per
20:50    4      Rer
20:57    3      Spo
21:04   -1      Per
21;20    0      Spo
21:21    2      Spo
21:27    1      Per


More information about the Meteorobs mailing list