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arbacia

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Everything posted by arbacia

  1. Many tanks. To combine images taken in different days you can use Lunar Terminator Visualization Tool (LTVT) http://the-moon.wikispaces.com/LTVT I made that using a deformaton grid of the ray picture in Photoshop
  2. Today, july 12 has been selected as Amateur Astronomy Picture of the Day one of my photos of the ray system of the crater Kepler the ejecta ray system and blanket of Kepler strongly contrast against the dark basaltic material of Oceanus Procellarum. When the asteroid impact, the ejected material reflect the stratigraphic sequence: the original surface materials become deposited far awy from the rim of the crater, however, the deepest materials at the very bottom of the transient cavity are dopiseted near the rim. Thus, the rays of ejecta can be interpreted as a geological survey. What we found in the ejecta of Kepler is a great uniformity since all the ejecta are basaltic debris. By the geometry of the impact kinetic it is possible to estimater that the transient crater goes as deep as 6km beneath the surface and still did not pass all the Mare material of Procellarum basalt, therefore, at this point, basalts deposits are, at least, 6km thick. Further comments on the geology of this impact at my web site: http://www.astrosurf.com/patricio/luna/kepler.htm The same picture but with a more agresive enhancing was selected as Lunar Photo of the Day (LPOD) last june 9, 2012: Other day I got this picture near the terminator: That combined with the first shows the extension of the ray system and texture topography details Eventually I create this geologic chart: Where the Formation Fra Mauro appears in blue, Domes in Orange and eject mantle in yellow. Note the dome Kepler 1 Clear Skies Patricio
  3. "A completely new design" is for the body, not for the lens. BCO 6 and 10mm have a volcano-top inside of a ring. That dedign gives eyelash clearance at the time that doen't hurt the eyeball... The ring houses a rubber eyecup with lateral shield. BCO are made ex novo, but they are not "a new optical design"
  4. Star-Party Las Majadas 2012, Natural Park Serranía de Cuenca June 15-17, 2012 Hi, As every year I'm organizing a Star-Party in central Spain, 30km Northern the city of Cuenca, something in the middle between Madrid and Valencia. The star-party is held in a Camping placed in a Natural Park, in a mountainous area with elevations about 1500m. Besides of the astronomical obverving we will have daytime activities for all the family. We put special attention for the children. They will have a special observing sesion conducted by a teenager on a 12" dobsonian. Along the weekend will be some astronomy workshops for the children. The attendance is free, you need just to cover your own expenses. However to organize the activities would be great to be registered. We expect about 100 amateurs. Besides we usually share the telescopes, Meade Instruments Europe offers four big telescopes for the use of the attending people. All the best Patricio More information in my website (in Spanish) http://www.astrosurf.com/patricio/lasmajadas2012.htm Don't hesitate to ask me any question at patricio (at) geo.ucm.es Rock formations in one of the trips we will do. Observation area inside the camping (elevation 1500m) Luminic pollution map. Haircross for the camping. Madrid at the left, Valencia at the right.
  5. Thanks, actually because the regular seeing, the blue-channel was blured giving to the picture this aspect, like covered by a veil. On the other hand, in this picture I'm very close to the limit of resolution of my equipment. Io was just over 1 arcsec. Patricio
  6. Hi, One of the images taken those nights has been selected Astronomy Picture of the Day (AAPOD) for march 4, 2012. The picture shows Jupiter and a transit of Io while is casting its own shadow at the othe side of the Great Red Spot. In the magnifized insert, Io shows an orange colour and some darker albedo details in the polar caps. Cheers, Patricio
  7. Hi, Today I found that this picture I show you soon after I made it, has been selected as Amateur Photography of the Day for the February, 14 2012 Mars: the smooth hemisphere February 14 2012 Amateur Astronomy Picture of the Day - Astronomy.FM Mars: the smooth hemisphere Mars centered in Amazonis Planitia. This hemsiphere is particularly uniform at the telescope. The clear spot near the terminator, at the right, is Mons Olympus. This albedo feature was known by early astronomers as Nix Olympica (the snows of olympus). Polar Cap shows asymmetries and a lobe extending toward Utopia.
  8. The baader film is safe. I have been using it for years. In fact, I made a number of cells. My previous message was only a reminder about the installation of some mechanism to hold safely the cell to the telescope. A simple cord or velcro is enough. Be carefull with adhesive velcro or tape as them with the heat of the sun can detach. Patricio
  9. Just a point about safety: Use some string or velcro or whatever to strongly hold the filter to the telescope. A gust of wind could blow away suddenly the flter and that is extremelly dangerous for the observer.
  10. New: nd1.8 48mm nd3 48mm Try second hand in ebay
  11. Try with photografy filters. astronomical 2" filter mount is 48mm photography filter mount. 1,25" is 28mm 48mm filters can be found very cheap in sales and ebay. They were the standard for Leica and Canon before digital arrives.
  12. For Mars, at present I use Televue Mars typ A y Typ B (both of them are too expensive that I don't recomend you have them as first filters). What I have been using for Mars is a Baader Red filter, Baader orange and Baader Neodymium. The Neodymium is superb in Jupiter, Mars and Moon. Looks like a clear filter with a mauve tint. However this filter is opaque to yellows and in Mars and Jupiter, all the pplanet surface is rich in yellows. Blocking the yellow other colors get contrast. A natural colour contrast. The thing is that the Neodymiun filter can be stacked with Red and Orange filters to improve the views of Mars. In fact, one of the televue Mars filters is an orange with a multiband filter coating. Take your time before buying filters. Some of them have a subtle efect and that is a personal choice. Some of then represent an important investment and that money can have a better use in better eyepieces. Get the antares ND13 filter for the moon and the red filter for Moon and Mars. Both are cheap, but consider to get better eyepieces before to have a large collection of filters. Patricio
  13. For cropping the video pre-process it in Castrator Webcam Astrophotography by Emil Kraaikamp - Castrator Castrator will center (=register) all the frames on the planet and crop the frames as you whish, creating a much lighter video file. The resulting video file will weight a lot less (in this case only a few Mb) and, as the planet has been pre-registered, Registax will work better and much faster. Use a barlow or eyepiece proyection to get a bigger planet. Care with the focus, take your time to focus. Observe the stars arround, if they are blinking probably you will not get good results on the planet.
  14. "The modern moon: a personal view" by Charles Wood I own more than one hundred books on the moon and a huge amount of academic papers on the topic. For me the best for amateur observing is "The modern moon: a personal view" by Charles Wood Sky&telescope. Charles Wood is a retired lunar geologist, writer of the Lunar 100 column of Sky&telescope and the responsable of the LPOD. In "The modern moon: a personal view" Wood doesn't describe the lunar landscapes as seen from the telescope as many books do, but the real geology as seen through our telescopes in a very easy way, using the best style in popular science. Besides of that along the text includes a nice account of those researchers that devoted his carrers to the study of the moon. From my shelves is the book on the moon that I lent and gifted more often. http://www.amazon.co.uk/Modern-Moon-Personal-View/dp/0933346999/ref=sr_1_1?ie=UTF8&qid=1325940685&sr=8-1 Patricio
  15. There is a huge difference between the old and new DMK21, indeed. I had DBK31 (sold), I have DMK31 and DMK618, and some friends have the former DMK21. I test all of them. Have you read this article by Wolfgang Paech in the manufacturer camera blog? Test report: new DMK21AS618 Patricio
  16. The antares ND13 has 13% of transmitance. That ND# doesn't follow the standard ND numbers (see Neutral density filter - Wikipedia, the free encyclopedia) In my telescopes (C11, LB12" and LB16") I use a photographic 48mm (=2") ND4 and ND8 as They have 25% (1/4) and 12,5% (1/8) of transmitance. I use mainly the ND8 which is like the Antares ND13. For the moon consider also a Red filter. As it similarly reduces the amount of light, the red light is less afected by atmospheric turbulences and increases the contrast in bluish mare materials (titanium rich) Patricio
  17. Hi, Wolfdogg, when I received my old orange C8 (1978) it was in worse state than yours. I disassembled it completelly and clean all the mirror under the tab (at home the water is OK, no residuous). Later I did the same with many others, including one like yours. Wolfdogg, at least the Schimdt plate should be cleaned. Remove the Schimdt plate. First the six screws, then the aperture retaining ring. Then use a felt permanet marker to mark the position of the Schimdt plate. Use a marker in both: frame and Schimdt plate to place again in the same place. Paint sevral marks as during the washing can be deleted! There is a some small cork strips in the edge of the plate. Remove them and record their position. Usually there are three of them. Grab the secondary holder and try to lift the plate. rotate something. Be careful. As the time flyes, the plate can be "glued" itself. If doesn't go out easily check if it is glued to the suppot. In this case some drops of water, or medical alcohol in the edge can help. Left for minutes or hours rehydrating and softenen the adhered parts. Once soft, grab again the secondary holde and pull. Clean the Scmidht plate as any optical glass (which includes glasses, by the way. Usually people take care of telescope lens but not of the glasses). Probably it can be cleaned with no removal of the secondary mirror and holder. Check the state of the primary. If primary mirror needs to be cleaned I will give some tips. basically once extracted from the tube don't remove it from its holder Patricio
  18. Well done. Very detailed pictures. Patricio
  19. Telrad is terrific. The graduated circles are a nice navigation tool, much more useful than it looks at first glance. Red dot finder is only a pointer in which you miss the proportions. Moreover Telrad has a wide screen in which we have not the tube vision given by red dots. Telrad is huge, well made, robust, light, sturdy. Easy to place and take away of the telescope with no loss of alignment. Extrematelly easy of align. Rigel finder is similar to Telrad. Much smaller. Include a pulse regulator. The screen is also smaller and has not the outermost circle. In europe usually is easy to find it in shops. Telrad has the pulse as a extra. At present I have two telrad and one rigel and I detached all the red dotfinder I had, including one of the best: Baader Skysurfer V (90€). Telrad and rigel are, both of them, definetively a step forward.
  20. Hi, Alcalá de Henares, Human heritage place, I love it. I used to live in London... Actually, for planets and moon, Light pollution is not relevant. However the local seeing conditions are. The recent development of lucky imaging techniques allow amateurs to do this kind of pictures under very poor conditions. Unfortunatelly, at home is very confortable to use the telescope but LP is there and I left deep sky observing for field trips with my dobson 16". At present I use a filter wheel with: Astronomik RGB type 2 filters, Astronomik IR Planet pro 742 & 807, Baader Venus U-filter and Baader Methane band 809. I have a second set of low pass IR filters ranging from 680 to 1000nm that I got recently, I expect to test them soon. A close friend has a dome observatory with a C14 in Sierra Morena (border between Castilla-La Mancha and andalousie (see my signature). There we forget about LP and the seeing use to be much better, not premium but better. Patricio
  21. Hi, No, no in my house. I have a lot of low level turbulence. Seeing usually is 3/5 or worse. Plenty of roofs, heaters fumes... Moreover I´m living near Barajas airport, the fourth european in traffic and placed in a confined wide valley. Generally speaking peninsular Spain is a mountanous country. Particularly, Madrid is in the northern limit of a high plateau (650 m over sea level) and 40-60km southern of a 2000m high NE-SW mountain range. At 100 km East a 1500m high plateau and 100Km South a 1200m high range. There are local areas of exceptional seeing in peninsular Spain, but this is not the general rule. However, at only 100 miles away of Madrid (5 million people), we have dark areas.
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