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Small Vulcanic Structures on the near side of the Moon
observed with an Earth based medium size Amateur Telescope

Lunar Domes, Pyroclastic Areas of Deposit, Plateaus, Megadome Plateaus
Sinusoidal Lava Tubes and Floor Fractured Craters
 
Wolfgang Paech + Franz Hofmann  / Last Update: 25.09.2016 /  Contact  

 
This site shows a large part of the front of the moon at an intervall of about 24 hours and a moon age from 3.3 to 14.8 days (12 - 100% illumination) with special attention to small structures lunar volcanism in high resolution.

The orientation of the images is different from the modern representations in lunar atlases. They are orientated in the same way as the CCD camera captures the images in the focus of the telescope - SOUTH is up and EAST is LEFT.
The image resolution is on average between 1,000 to 2,000 meters, whereas for some images - depending on the lunar distance, the position of the details in viewing direction to the earth and the illumination - it is even under 1,000 meters. Height differences of about 50 m are visible.


Another lunar atlas showing normal lunar structures such as craters, rilles, mountains ... we present here.

Two examples perfectly illustrate the high image resolution: The "Floor Fractured" crater Alphonsus with rilles and pyroclastic volcanism and the two lunar Cones Isis and Osiris in the Mare Tranquillitatis southwest of the landing area of Apollo 17.
 
Nearly all images are from 2015, taken in the months of July, August and September. A few images from the years 2007 to 2014 and 2016 were included due to special illumination situations. With very few exceptions, the images were taken in the focus of a Celestron C14 (f = 3.900 mm) with a Celestron SkyRis 445M video module. A Baader IR pass filter was used to optimize the seeing for all recordings. Location of the telescope were two guest farms in Namibia: the Rooisand Desert Ranch (2007 to 2011) and from 2013 the Onjala Lodge near Windhoek.

A very small part of the images was taken at the 430mm (f / 6.8) PlaneWave astrograph of the Rooisand Desert Ranch, partly recorded with a Baader Q - Turett Barlow lens ( f approximately 4.500 mm ).

The video streams have been processed with a standard recording method and a standardized image processing mode. The summed images were created with the software AviStack 1.8, the final processing was done in Adobe Photoshop CS 2. The length of each video stream was between 1200 and 1500 frames - depending on the seeing conditions. 12 % of the frames were added to the final image.


Why a photographic lunar atlas with a special look on lunar volcanism? In our opinion, lunar volcanic structures belong to the most difficult details in the solar system which can be photographed by amateur astronomers and represent a major challenge for astrophotographers. There is no other body in the solar system where the amateur can document volcanic structures in high resolution. If it is the speech of observation in the image captions, the photographic observation is meant, because most of the structures are too small for visual observation - or require very large telescope apertures under excellent seeing conditions.
 
More details about our images and the image resolution can be found here. If required, we also show pictures of the wide-angle camera of the Lunar Reconnaissance Orbiter (LRO). Height profiles of various structures are also created on the website of the Lunar Reconnaissance Orbiter. All images that do not originate from us are clearly marked. A short but detailed introduction into features of lunar vulcanism can be found here (at the moment only available in german language).
 
Choose one of the following segments:

Segment 01: Mare Crisium, Mare Undarum, Geminus, Proclus, Mesalla, Cauchy Region
Segment 02: Mare Fecunditatis, Messier, Petavius, Langrensus, Furnerius, Vallis Rheita
Segment 03: Highland regions around the craters Janssen, Stöffler und Maurolycus
Segment 04: Western part of Mare Nectaris, Theophilus, Fracastorius, Piccolomini, Albategnius, Deslandres, Walter

Segment 05: Mare Tranquilitatis, Mare Serenitatis, Posidonius, Aristillus, Autolycus. Gardner, Jansen, landing site of Apollo 15+17
Segment 06: Eastern part of Mare Frigoris, Atlas, Herkules, Endymion, Aristoteles, Eudoxus, Lacus Mortus
Segment 07: Northern part of Mare Imbrium, western part of Mare Frigoris, Plato, Sinus Iridum
Segment 08: Mare Imbrium, Archimedes, Erathostenes, CoperniCus, Apenninen
Segment 09: Mare Nubium, Eastern part Mare Humorum, Lansberg, M. Riphaeus, Pitatus, Bullialdus
Segment 10: Highlands, Tycho, Clavius, Newton, Heinzel, Mee
Segment 11: Western part of Mare Humorum, Schickard, Gassendi, Crüger, Billy, Grimaldi
Segment 12: Oceanus Procellarum, Sinus Roris, Kepler, Reiner, Marius Hills, Aristarch Plateau


DOWNLOAD: pdf-file with a list of all volcanic structures of this lunar atlas (only in german language)
< © NASA/LRO
 
Concerning the technical data of the images: the theoretical image resolution depending on the wavelength of the light results for both telescopes in the following table.
 
Wavelength
in nanometer
Celestron 14, aperture 350mm
resolution in arcseconds
Planewave Astrograph, aperture 430mm
resolution in arcseconds
     
blue, 400 nm 0.23 0.18
green, 550 nm 0.31 0.25
red, 680 nm 0.40 0.33

 
The image scale in the focus of the C14 with the SkyRis 445M arises to 0.2"/pixel (pxl). For example: At a Moon distance of 367,211 km (diameter of the Moon = 32.53 arcminutes or 1,952 arcseconds) on 09.28.2015 you can find the following theoretical values:

1 km on the Moon (in the middle of the Moon) corresponds to 1.8". Therefore, 1 pixel in the image corresponds to 110 meters on the Moon (theoretically), practically in the red wavelength around 300/400 meters. The field which is shown in the focus of the Celestron 14 is (slightly) cropped about 5.4 x 4.0 arcmin, corresponding to 324 x 240 arcsec.

On some images objects are selected, which are not listed in the official lists of volcanic structures, but morphologically, they are very similar to the known structures. They are then either labeled with a "?" or marked with the word "putative". There is also a hint in the corresponding description.

 
Structures of lunar volcanism are very small (5 to 15 km in diameter) in the most cases. Summit crater (caldera) of lunar domes, similar to shield volcanoes on earth, have diameters of only 1,000 to 3,000 meters. The usually very small heights of the structures, on average between 75 and 150 meters, require an extremely low solar elevation, which means they are only visible a few hours at the terminator region.

Basic preconditions for successful observations are therefore:
  • low solar elevation at the chosen structure on the Moon
  • for observation: a clear sky and almost darkness
  • very good to excellent seeing conditions.
Therefore such images require patience or - as in Namibia often available - a cloudless sky over long periods of time.

Lunarer volcanism - a short overview

Like on Earth, the lunar volcanism can be roughly structured into the following basic types:
  • Effusive volcanism
  • Intrusive and extrusive volcanism
  • Pyroclastic (explosiv) volcanism
  • a mixture of them.
The following structures arised from the volcanic activity:
  • Lunar Domes/lunar Cones
  • Super-, Megadomes, Megadomeplateaus
  • Lunar pyroclastic deposits
  • Floor fractured crater (FFC)
  • Dark halo crater (DHC, DMD = Dark mantle deposits) and
  • Sinuous rilles
Special cases are
  • Lunar Kipukas
  • Concentric double craters and the
  • Aristarch plateau

Literature:

Our website is based on the work of Raffaello Lena, Maria Teresa Chiocchetta, Mike Wirths, Paolo Lazzarotti, Jim Phillips, Carmelo Zannelli, Stefan Buda and George Tarsoudis. They are a loose group of amateur astronomers, who specialized on the observations of lunar volcanism.

All geometric data, coordinates, diameter, height and classification of lunar domes on our website based on their work. It is summarized and referenced to many scientific results in lunar research in the book:
LUNAR DOMES - Properties and Formation Processes, Raffaello Lena, Christian Wöhler, James Phillips und Maria Teresa Chiocchetta, Springer Verlag, 2013, ISBN: 978-88-470-2636-0

The website of the Geological Lunar Researches Group (GLR) can be found here and a list of publications here. There is also a website with a list of lunar domes.

Further literature:

http://target.lroc.asu.edu/q3/

This is the website with the interactive map of the Moon of the Lunar Reconnaissance Orbiters Team. It provides direct access to any lunar formation, starting with a scale of 4 km per pixel. You can zoom in to a magnification of 64 meters per pixel for the images taken with the wide-angle camera, followed by the image strips of the tele camera where the scale is up to 1 meter per pixel. In addition, you can switch on various overlays like digital elevation models. All images that we have included into this lunar atlas are marked with LRO. General information on this NASA spacecraft can be found here.


At http://www.avistack.de you can download the video image processing program which we have used to process the moon images. It has been programmed by Dr. Michael Theusner and is freeware. See also our page for image processing.

Highly recommended literature and lunar atlases:

Charles A. Wood: The Modern Moon: A Personal View, Sky Publishing Corporation, 2005
Charles A. Wood, Maurice Collins: 21st Century Atlas of the Moon, West Virginia University Press, 2012
Motomaro Shirao, Charles A. Wood: The Kaguya Lunar Atlas: The Moon in High Resolution, Springer, 2011
W. Paech, M. Weigand und A. Chu: Fotografischer Mondatlas: 69 Mondregionen in hochauflösenden Fotos, Oculum, 2010
A. Chu, W. Paech, M. Weigand und S. Dunlop: The Cambridge Photographic Moon Atlas, Cambridge University Press, 2012
The following two publications are pdf-files and free for download. Both - Alan Chus Photographic Moonbook and K.C. Paus Photographic Lunar Atlas for Moon Observers - are modern milestones in amateur moon observation. Mr. Chu is also a member of the Hong Kong Astronomical Society and both are observing from Hong Kong

Alan Chu: Photographic Moonbook (version 3.5, edition 2011, 260 pages)
K.C. Pau: Photographic Lunar Atlas for Moon Observers (Second edition 2016, 900 pages)
And Last but not least we would like to thank Mr. Martin Rietze for his support regarding terrestrial volcanism. He belongs to the world's best photographers of terrestrial volcanism and is author of some books of this topic. A visit of his website is breath-taking.
All Images - otherwise marked - and all Content are © by Franz Hofmann + Wolfgang Paech