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Meteors, meteoroids and atmosphere

Meteors

The table below lists data of the most known meteor showers. In the case of broad maxima no peak time is given. Specific hints can be found in the of the International Meteor Organization (IMO). The listed activity period refers to the time when the shower can be easily recognized by visual observers and is therefore shorter than in most other compilations.

                         Visibility         main peak           max. hourly                            period                                            rateLyrids                 Apr 16-28       2018 Apr  22, 18UT           20Eta Aquariids May 00-20      2018 May 06                     up to 70 (from 40 deg N)Perseids            Aug 00-24      2018 Aug 12,20UT           100
Draconids        Oct 07-10       2018 Oct 09, 00 UT              10 uncertainOrionids            Oct 01-31       2018 Oct 21/22                      25
Leonids             Nov 13-30      2018 Nov 17,23UT               15 also Nov 17 + 19
Geminids          Dec 04-17      2018 Dec 14, 14 UT          150Ursids                Dec 20-23      2018 Dec 22, 19 UT            15Quadrantids   Jan 00-10       2019  Jan 04, 02 UT          120 Lyrids                 Apr 16-28      2019 Apr 23, 00UT              20Eta Aquariids May 00-18     2019 May 06            up to 70 (only south of 40 deg N)

Atmosphere

Images of (more or less) unusual atmospheric situations, often during twilight or when objects are close to the horizon - for example this orographic cloud covering the summit of Mount Teide (Tenerife) with the Sun just on top of the image filed of view.

Minor planets

Minor planet 20518 Rendtel discovered by Andre Knoefel on 1999 September 12 - a main belt object with a=3.2 au.

Noctilucent clouds

Clouds of this unique type have been reported first by Backhouse, Jesse and Leslie in 1885. Jesse initiated an observing program. One of the surprising reults was the unusual height: these clouds (abbreviated NLC) were found at 83 km ever since. Although there are numerous observations including systematic series, there are still several aspects open. There seems to be a close relation to Polar Mesospheric Summer Echoes (PMSE) - see the webpage of the Swedish IRF. Hints for observers are given e.g. at the homepage of the Arbeitskreis Meteore .