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(meteorobs) s& t coverage of leonids
The coverage was not what I expected.Nice pictures of which I thought the nicest was Espenak's wide angle and the smoke ring picture. But the coverage was on the paltry side while the coverage of the june 2001 eclipse was absolutely putrid. They once did a great job with eclipse coverage like 1979, 1973, 1972. I just don't know why they don't put more time into extensive well observed events that don't come around too ofte.
Dr.Eric Flescher
>
> meteorobs-digest Monday, February 4 2002 Volume 04 : Number 856
>
>
>
> (meteorobs) Weekly IRC Meteor Chat on Monday!
> (meteorobs) linear wm1
> (meteorobs) Un Cometa brillante Linear WM1
> (meteorobs) Leo 2001 coverage in S&T 3/2002
> Re: (meteorobs) Leo 2001 coverage in S&T 3/2002
> (meteorobs) Observation Feb 02/03 (LINMI)
> (meteorobs) Comets off
> (meteorobs) New meteor shower?
> (meteorobs) Excerpt from "CCNet 19/2002 - 2 February 2002"
>
> ----------------------------------------------------------------------
>
> Date: Sun, 3 Feb 2002 04:00:03 -0500
> From: Lewis Gramer <dedalus@latrade.com>
> Subject: (meteorobs) Weekly IRC Meteor Chat on Monday!
>
> As usual, there will be an Internet Relay Chat (IRC) session
> about meteor observing on Monday evening, starting at 8pm EST,
> (which is 01:00 UT on Tuesday morning). Anyone with an interest
> in meteors, around the world, is welcome to attend this session
> (or our chat on Saturdays, 11am EST, 16:00 UT).
>
> To attend, download a copy of one of the many IRC "client
> programs" (a good one for Windows is called "mIRC", and one for
> the Mac is "IRCle": both are available as try-to-buy shareware
> on the Internet). Once you have an IRC client on your computer,
> connect to the server on "DALnet" known as: irc.daldot net
>
> After connecting to irc.daldot net, you'll need to enter the
> IRC command for joining a chat session: /join #meteorobs
> "#meteorobs" is the name of our meteor chat session. Good luck,
> and we look forward to "seeing" you on the "#meteorobs channel"!
>
> Lew Gramer
> owner-meteorobs@atmob.org
> Co-Channel Operator of #meteorobs
> Internet Coordinator, N.A.M.N.
> The archive and Web site for our list is at http://www.meteorobs.org
> To stop getting all email from the 'meteorobs' lists, use our Webform:
> http://www.meteorobs.org/subscribe.html
>
> ------------------------------
>
> Date: Sun, 3 Feb 2002 11:20:15 EST
> From: KCStarguy@aol.com
> Subject: (meteorobs) linear wm1
>
> Yes it is heading back up North but has already faded.
> I took pics of it a few months ago.
> http://members.aol.com/kcstarguy/blacksun/linearwm1.htm
>
> When it comes back up where we can see in US, I will take more pics and
> compare.
> Dr. Eric Flescher (KCStarguy@aol.com)
> webmaster Eric's Black Sun Eclipse website -
> http://www.ericsblacksuneclipse.com -editor- Black Sun eclipse newsletter
> (eclipse and astronomy news) to subscribe send email to
> blacksunnews-subscribe@egroups.com
>
> <<
>
> Too bad it can't be seen by us northern observers,
> though! Does anyone know whether this comet may be
> visible for another "pass"?
>
>
> Noisy meteors and exploding comets!
>
> Mark Fox >>
>
> The archive and Web site for our list is at http://www.meteorobs.org
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>
> ------------------------------
>
> Date: Sun, 3 Feb 2002 11:38:07 -0800 (PST)
> From: FAMA FAMA <famaastro@yahoocom>
> Subject: (meteorobs) Un Cometa brillante Linear WM1
>
> Hola a todos,
>
> El Cometa Linear WM1 ha aumentado notablemente de
> brillo, en enero apenas era visible a simple vista con
> magnitud +6, en los primeros días de febrero ha pasado
> a magnitud +3 por lo que puede observarse a ojo. Se
> encuentra en la parte sur de Sagitario cerca de la
> Corona Austral, les envío una liga donde pueden ver
> fotos de cuando se encontraba en Perseo tomadas por un
> amigo de la red mundial de observadores de meteoros.
> Pueden localizar el cometa con su Círculo Celeste
> FAMA, se le verá antes del amanecer. Tiene como
> coordenadas para el día de hoy:
> Asención Recta 19 horas 39 minutos 55 segundos
> Declinación -43 grados 19 minutos 23 segundos
>
> Cielos Despejados
>
> Rafael Angel
> FAMA
> 5544-8483
>
> Favor de abrir mensaje con las ligas de fotos y
> eclipses.
> Note: forwarded message attached.
>
>
>
> __________________________________________________
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>
> ------------------------------
>
> Date: Sun, 3 Feb 2002 22:37:47 +0100
> From: Daniel Fischer <dfischer@astro.uni-bonndot de>
> Subject: (meteorobs) Leo 2001 coverage in S&T 3/2002
>
> Am I the only one unhappy with the coverage of the 2001 Leonid storms
> in the new Sky & Telescope? Here is a letter I just sent them; as it
> exceeds their 300 words limit, it'll probably not make it into the
> magazine in full, so here is a "preprint":
>
> - ------------------------------------------------------------------
>
> The coverage of the Leonid meteor storms of 2001 in the March
> 2002 issue of Sky & Telescope seems strangely behind the times:
> Hard-working meteor researchers, mainly in the amateur
> community, have spent the last decades developing systematic
> methods for judging the strength of meteor outbursts - and all we
> get from the most influential astronomy magazine on the planet
> is a bewildering collection of individual soundbites and completely
> unreduced personal meteor counts. The numbers in the text as well
> as the plot on p. 104 are simply useless as no correction for the
> limiting star magnitude and especially for the elevation of the
> radiant was made - and the latter can change the perceived
> meteor rate by a factor of several.
>
> Simply put the number of meteors you see is the full number
> multiplied with the sine of the radiant's (in our case, the Lion's
> head's) altitude: If it is near the zenith, there is hardly any
> correction, if it is at 45 deg., you lose 30%, at 35 deg. you lose
> 42% and at 25 deg. 58% of all meteors. This is why calculating the
> Zenithal Hourly Rate (ZHR) is not a numbers game but the one and only
> way to find out what really happened. And if the observations of
> enough observers are used, the result tends to be quite consistent
> and the ZHR plot remarkably smooth. Within days of the 2001
> Leonids storms the picture was emerging, as could be followed on
> a number of meteor websites and mailing lists: The "American"
> peak reached a ZHR of some 1700, the "Asian-Australian" one
> peaked near 3500. Thus both 2001 storms actually fell short of
> the strength of the single-peaked Leonid storm of 1999 when the ZHR
> reached some 5000.
>
> Sky & Tel's statement that "during the previous half century
> only the brief Leonid outburst of 1966 exceeded the intensity of
> last November's display" therefore holds only true for the
> Americas and not at all for the whole word. The 1999 storm could
> be seen in all its glory - and with the radiant very high in the sky -
> from the Middle East: Having been a witness to the latter as well as
> the larger Asian peak of 2001 (from South Korea, with a lower radiant),
> I can testify that, while in 2001 the meteors were generally
> brighter, the impression of a real rain of meteors from the sky
> was indeed much more pronounced in 1999. And at times, in the
> desert of Jordan that night, I even shared the impression which
> Robert Liefeld recalls from the 1946 Giacobinid meteor storm (on
> p. 103): In 1999, too, it "felt like you were looking up at a cone of
> light falling from the sky."
>
> Relevant links can be found in the sidebar of the lead story of
> http://www.astro.uni-bonndot de/~dfischer/mirror/230.html and the
> latest ZHR profile is at http://www.imodot net/news/l01fin_a.gif
>
> Daniel Fischer
> Koenigswinter
> Germany
>
> dfischer@astro.uni-bonndot de
> The archive and Web site for our list is at http://www.meteorobs.org
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>
> ------------------------------
>
> Date: Sun, 3 Feb 2002 16:59:55 EST
> From: Skywayinc@aol.com
> Subject: Re: (meteorobs) Leo 2001 coverage in S&T 3/2002
>
> In a message dated 2/3/02 4:46:34 PM Eastern Standard Time,
> dfischer@astro.uni-bonndot de writes:
>
> << Thus both 2001 storms actually fell short of
> the strength of the single-peaked Leonid storm of 1999 when the ZHR
> reached some 5000. >>
>
> Actually . . . according to the IMO, the ZHR for the 1999 storm was
> placed at 3700, although there were indeed quite a few reports that suggested
> higher rates.
>
> I myself felt that the estimated IMO 2001 ZHR for the Americas of ~1500
> was a bit low, since during the peak I later commented that it seemed that
> (observing from Benson, Arizona) meteors were coming at a rate of one every 1
> to 2 seconds and that in talking to those who observed from atop nearby Mount
> Lemmon, ZHRs were initially estimated to be ~2500.
>
> - -- joe rao
> The archive and Web site for our list is at http://www.meteorobs.org
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>
> ------------------------------
>
> Date: Sun, 3 Feb 2002 17:22:21 -0500 (EST)
> From: Michael Linnolt <mlinnolt@alum.mitdot edu>
> Subject: (meteorobs) Observation Feb 02/03 (LINMI)
>
> Last night was our monthly star party on Oahu's north=20
> shore, and I took advantage of perfectly clear skies to do=20
> some evening meteorobs before the moon arose. Conditions=20
> were fairly typical of this location at an airfield just a=20
> few hundred meters from the ocean - very muggy and dewing,=20
> with a lot of SCT's and refractors put out of service...
>
> But the air above was fairly dry and good LM's lasted all=20
> night. I observed for about a half hour and saw 5 meteors.=20
> 3 SPO, 1 ANT and 1 AHY. No activity was seen from the 2=20
> southern radiants ACN or DVE, even thought they were near=20
> their optimum altitude. However, when I was packing up,=20
> around 11:45pm I saw a mag 1 meteor flash acrosss the=20
> zenith from south to north. It lined up well with the DVE,=20
> but just too swift to associate it with that stream.
>
> Next weekend I may try looking out for the IMO streams as=20
> the moon will no longer be an interference.
>
> BTW, slightly OT, there's a lot of other activity going on=20
> up there these days. A brightening supernova in M74 (mag=20
> 12.5), the new comet C/2002 C1 (mag 8.3), and a peculiar=20
> nova (/supernova?) in Monoceros currently at mag 7.4!
>
> Clear skies & Aloha!
> Mike Linnolt
>
>
> REPORT FOLLOWS:
> - ---------------
> OBS: Mike Linnolt (LINMI)
> DATE: Feb 03, 2002
> TIME: 0840 - 0915 UT (10:40pm - 11:15pm HST evening of Feb=20
> 02)
> LOC: Dillingham, Oahu, HI (21=B0 34' N, 158=B0 12m W)
> ELEV: 5m
> Conditions: Clear. Temp 68F. RH 90%. Winds light.
> METHOD: Paper
>
>
> Observing Periods Summary:
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
> =3D
>
> # Period(UT) FOV Teff F LM ACN DVE AHY VIR SPO
> ---------- --- ---- - --- --- --- --- --- ---
> 1 0840-0915 07h+10 0.57 1.0 6.3 0 0 1 1 3
>
> VIR (IMO) =3D ANT
>
> Periods Detail:
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>
> Period #1:
> - ----------
>
> Mag -3 -2 -1 0 +1 +2 +3 +4 +5 +6 elev r ZHR
> - ------------------------------------------------------
> ACN: 0 0 0 0 0 0 0 0 0 0 =3D 0 13=B0 2.5
> DVE: 0 0 0 0 0 0 0 0 0 0 =3D 0 19=B0 3.0
> AHY: 0 0 0 0 0 0 1 0 0 0 =3D 1 37=B0 2.8 3.6 +/-3.6
> VIR: 0 0 0 0 0 0 0 1 0 0 =3D 1 54=B0 2.3 2.6 +/-2.6
> SPO: 0 0 0 0 0 0 0 1 1 1 =3D 3 -- 2.5 6.3 +/-3.6
>
> DEAD TIME: 4 min
>
>
> END OF REPORT.
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>
> ------------------------------
>
> Date: Sun, 3 Feb 2002 20:38:50 -0200
> From: "Rosely Gregio" <gregio@dglnet.com.br>
> Subject: (meteorobs) Comets off
>
> Comets Off topic
>
> Astrosaudações Cometárias!
>
> I like a lot to observe and to seek comets, as well as you observe the
> showers of meteors. But my sky continues cloudy: ((I am sad for still there
> not to be to get to see LINAER WM1 that has been sighted here in Southern
> Hemisphere with mag. 3 , visible I look it unarmed and to the telescope it
> presents a beautiful tail it curves with about 2 degrees. He is being
> visible the about 15 degrees on a clean and clear horizon to the dawn.
> On the new Comet 2002 C1 you can see image done by my friend Paulo Raymundo
> (Salvador , Bahia - Brazil) in: http://btboar.tripod.com/c1com.jpg. For
> they know that intrepid amateur's work better in astronomy they visit:
> http://www.reaiche.com/Astronomy.html. Besides beautiful images of meteors
> Leonids; the last passage of longing MIr for our southern sky and much more.
> (Site in English).
>
> Amateur's question: Even with highly cloudy sky, it would be possible a fast
> meteor is sighted with shine around -5.0 to -4.0 mag. below the clouds? In
> this case, could this meteor be classified as a meteor?
>
> Celestial hugs and clean skies for everybody!
>
> Rosely - Br.
> Mococa - lat. 21.27.54 S - Long. 47.00.21 W
> gregio@dglnet.com.br
> http://www.constelacoes.hpg.com.br
> http://membro.intermega.com.br/rgregio/
> http://construindobjetos.na-webdot net
> http://www.geocities.com/alnitack_br/
> http://membro.intermega.com.br/fenomenos/
>
>
> The archive and Web site for our list is at http://www.meteorobs.org
> To stop getting all email from the 'meteorobs' lists, use our Webform:
> http://www.meteorobs.org/subscribe.html
>
> ------------------------------
>
> Date: Sun, 3 Feb 2002 22:51:55 -0200
> From: "Rosely Gregio" <gregio@dglnet.com.br>
> Subject: (meteorobs) New meteor shower?
>
> Meteoric greetings!
> I read that can have a shower of meteors. Somebody of you cannot or not to
> confirm
> Does it exist possibility there to be a meteor shower related to the LINEAL
> WM1 comet about of May 18-19, 2002 approximately to 01:08 UT?
>
> Well, in any way I will be attentive in the night of May 18-19 to see a
> meteor shower it already happens in the southern hemisphere different from
> those classified.
>
> Celestial hugs with clean skies!
>
> Abraços Celestes
> Rosely - Br.
> Mococa - lat. 21.27.54 S - Long. 47.00.21 W
> gregio@dglnet.com.br
> http://www.constelacoes.hpg.com.br
> http://membro.intermega.com.br/rgregio/
> http://construindobjetos.na-webdot net
> http://www.geocities.com/alnitack_br/
> http://membro.intermega.com.br/fenomenos/
>
>
> The archive and Web site for our list is at http://www.meteorobs.org
> To stop getting all email from the 'meteorobs' lists, use our Webform:
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>
> ------------------------------
>
> Date: Mon, 04 Feb 2002 13:22:51 -0500
> From: Lew Gramer <dedalus@latrade.com>
> Subject: (meteorobs) Excerpt from "CCNet 19/2002 - 2 February 2002"
>
> - ------- Forwarded Message
>
> From: Peiser Benny <B.J.Peiser@livjm.acdot uk>
> To: cambridge-conference <cambridge-conference@livjm.acdot uk>
> Subject: CCNet: CARBON AT THE K/T, EPH FLOPS & DEEP IMPACT ESTIMATES
> Date: Sat, 2 Feb 2002 09:55:47 -0000
>
> CCNet 19/2002 - 2 February 2002
> - -------------------------------
>
> [...]
>
> (3) ESTIMATES OF EFFECTS OF THE DEEP IMPACT INTO TEMPEL 1
> Keith Holsapple <holsapple@aa.washingtondot edu> and
> Kevin Housen <kevin.r.housen@boeing.com>
>
> [..]
>
> ============
>
> (3) ESTIMATES OF EFFECTS OF THE DEEP IMPACT INTO TEMPEL 1
>
> >From Keith Holsapple <holsapple@aa.washingtondot edu> and
> Kevin Housen <kevin.r.housen@boeing.com>
>
> Re CCNet 23 Jan 2002:
>
> "The Deep Impact mission hopes to reveal the nature of the threat
> and how to deflect it safely. On American Independence Day 2005,
> Deep Impact will reach its target, the six-kilometre diameter comet
> Tempel 1. The space probe will release a 350-kilogram (770 lbs)
> projectile into the heart of the comet at 10 kilometres per second
> (six miles per second). It is expected to blow a crater the size of a
> football field and 20 metres (65 feet) deep. The comet will survive
> but should reveal the nature of its interior to add to scientific
> knowledge and to guide any future plans to deflect a killer comet
> with a nuclear nudge."
>
> These crater estimates have been made by Peter Schultz, and have been
> quoted by several recent contributions. We would like to go on record
> as noting that these estimates of the effects are vastly different than
> ours. As Schultz also notes in [1] referenced below, the actual result
> may simply be a compression crater with little ejecta or surface
> expression, or it may be very large. Schultz's estimates are based on
> the large assumption. We favor a much lower value: we would predict a
> crater on the order of 10 meters or less, not the 100 meters of a
> football field.
>
> These estimates differ by factors of about 1000 in crater volume, and
> corresponding differences in the amount of ejecta. Why this large
> discrepancy? It arises from the simple fact that we cannot perform
> experiments at the size scale of interest, with 10km/s impact velocity,
> on the actual (unknown) material, and at the low gravity of the surface
> of Tempel. Therefore, one does the experiments that are possible, and
> extrapolates to the conditions of interest. Those extrapolations use
> scaling theories: theories about how the answer depends on the
> parameters of the problem. Here those parameters are the impact
> velocity, the impactor size, and the surface gravity. Schultz has done
> experiments in low density porous materials at 1 G and various velocity,
> and then applied scaling theories. Housen [2] has done experiments in a
> low density material also, and at variable gravity but at a single
> velocity.
>
> We would not extrapolate Schultz's results the same way he does. While
> not going into details here, basically he has assumed that his results
> should be gravity-scaled, while we believe they should use
> strength-scaling. Using his approach, the crater sizes increase as a
> power law (about -1/2) of gravity. When extrapolated back to the .08
> cm/sec^2 gravity on the surface of the comet, he obtains his large
> estimate. Our scaling approach would imply that the results are
> essentially independent of surface gravity, so do not increase at low
> gravity compared to the 1G experiments. (For the definitions of these
> scaling regimes, one can consult, for example, Holsapple [3] listed
> below.)
>
> At the LPSC conference in March in Houston, Housen will be presenting
> his results and interpretations [2], and Schultz will be presenting his
> [1]. The large uncertainties illustrate the need for missions of this
> type. Here the real results will be known in 2005. It is nice to have a
> debate about something where the correct answer is forthcoming.
>
> References:
> [1] Schultz, P. H. ,Anderson, J. L. B. and J. T, Heineck, Impact crater
> size and evolution: Expectations for Deep Impact, Lunar and Planetary
> Science XXXIII, March 2002.
> [2] Housen, K. R., Does gravity scaling apply to impacts on porous
> asteroids?, Lunar and Planetary Science XXXIII, March 2002.
> [3] Holsapple K. A. (1993) The scaling of impact processes in planetary
> sciences. In Ann. Rev. Earth Planet. Sci. 21 , Wetherill, Albee and
> Burke, eds), 333-373.
>
> - --------------------------------------------------------------------
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> - ------- End of Forwarded Message
>
>
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> ------------------------------
>
> End of meteorobs-digest V4 #856
> *******************************
>
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