Posidonius crater-March 7, 2014

Posidoniu​s: a FFC crater

Posidonius crater-March 7, 2014
Posidonius crater-March 7, 2014


This is a sketch of the crater Posidonius made trought my 6” achromatic refractor (TS Individual 152/900), binoviewer, a pair of 10 mm eyepieces (BCO´s) and Barlow that gave me 330x. The seeing was very poor at the beginning of the session but it was improved until I could get very stable view of this formation.

Posidonius is a beautiful crater that can be classified as a FFC crater (Floor Fractured Crater). It has several fractures on its floor that can be observed with small telescopes, and also the amazing Rima Posidonius, a lava channel that crosses the crater from north to south on the eastern part of the crater. The origin of this kind of FFC´s is controversial but the modern theories suggest that a magmatic intrusion below the crater bulged and fractured the floor.

The complex pattern of the shadows and the variety of characteristics and formations inside Posidonius make this crater a very interesting observation target for any amateur astronomer.

I hope you to enjoy with this sketch.

•Object Name: Posidonius crater
•Object Type: Lunar crater, FFC crater
•Location: Vitoria-Gasteiz (Basque Country)
•Date: 7-3-2014
•Media: graphite pencil on white paper, captured with digital camera and processed with Gimp.

If you wish to read more about this observational report and others, please visit the web of my astronomical group (www.laotramitad.org).

Best regards.

David Sedano

3 thoughts on “Posidoniu​s: a FFC crater”

  1. Thank you very much for your comments!
    I still have much to learn from your wonderful drawings.

    Best regards.


    PD: Almach, sigo desde hace mucho tiempo tu magnífica web. Buen trabajo! sigue así! es una referencia para muchos de nosotros.

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