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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 Meteor Shower Calendar 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 rate

Lyrids Apr 16-28 2018 Apr 22, 18UT 20
Eta 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 uncertain

Orionids 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 150
Ursids Dec 20-23 2018 Dec 22, 19 UT 15
Quadrantids Jan 00-10 2019 Jan 04, 02 UT 120
Lyrids Apr 16-28 2019 Apr 23, 00UT 20
Eta 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 .