ARLA/CLUSTER: Chuva de Meteoros durante o AVHFC

[João Gonçalves Costa]

De: radioamadores_algarve  yahoogrupos.com.br [mailto:radioamadores_algarve  yahoogrupos.com.br] Em nome de Jose Guerreiro
Enviada: quinta-feira, 3 de Maio de 2012 09:09
Para: radioamadores_algarve
Assunto: [Radioamadores Algarve] Chuva de Meteoros durante o AVHFC







Informações pelo MMMonVHF e IMO.

Flávio PY2ZX
--

** Meteors in May **

The most prominent shower this month is n – Aquariids, peaking May 05,
19h UT.

This shower, related to the rich stream associated with comet 1P/Halley,
is characterized by a broad maximum, sometimes with a variable number of
submaxima. Recent IMO analyses, based on data collected between 1984 and
2001, indicate that ZHR is generally above 30 hr-1 between about may 3-10.

The peak rates appear to be variable on a roughly 12-years timescale,
due to influence of Jupiter. According to this model, the most recent
highest rates should have happended around 2008-2010. Peak ZHR around
65 hr-1 is predicted for 2012. Please note that n – Aquariids radiant is
above horizon (thus making the shower usable for MS) in Europe only
(approximatively) in very late night and morning hours. While southern
Europe stations will be able to “see� the radiant till early afternoon,
in northern Europe skies the radiant culminates at reletively low
elevation so an observer is able to see the radiant for much less time.

Some daytime showers (? – Cetids, peaking May 20th being the most
significant ) will be also active this month; in addition to increasing
Sporadic Meteors background, they will provide good conditions for MS
DXing.

Theoretical peaktimes for May meteorshowers can be found here:
http://mmmonvhf.de/ms.php

SOURCE: Massimo, IV3NDC, team MMMonVHF
--

April to June

Meteor activity picks up towards the April-May boundary, with new Moon
gracing both the late April shower maxima. Sadly, the η–Aquariids in
early May are very poorly placed [for visual activities], with full Moon
on May 6, just a day after their predicted peak on the 5th. Stronger
η–Aquariid activity can persist at near-maximum levels for several days,
although the shower can be observed usefully only from equatorial and
southern hemisphere sites for a few hours before dawn. Rates should be
in the declining phase of the shower's theoretical 12-year cycle in
2012, with ZHRs of perhaps 60–70. The minor η–Lyrids fare little better,
expected at maximum perhaps on May 8 or 10, with May's waning gibbous Moon.

http://www.imo.net



--


 Antes de imprimir este e-mail pense bem se é mesmo necessário. Poupe electricidade, toner e papel, mantenha o planeta VERDE.

Obrigado. José Carlos

CT1EPS



__._,_.___


Este e-mail
destina-se a fornecer informações de utilidade para os destinatarios
referidos, e não poderá ser considerado SPAM. Se não desejar receber
mais informações deste emissor, responda a este mail com -REMOVER- no
campo "ASSUNTO", ou bloqueando o emissor deste mail, nas suas
configurações de privacidade. Esta mensagem está de acordo com a
legislação Europeia sobre o envio de mensagens (Directiva 2000/31/CE do
Parlamento Europeu; Relatório A5-0270/2001 do Parlamento Europeu).



-------------- próxima parte ----------
Um anexo em HTML foi limpo...
URL: http://radio-amador.net/pipermail/cluster/attachments/20120503/52cf4ca3/attachment.htm