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  • Roland Roberts's blog | astrofoto.org
    Read more about New Horizons Wake Up Call Log in to post comments Saturn s Ring System Just Got Bigger Submitted by Roland Roberts on Mon 11 09 2009 10 37 Okay the rings themselves haven t changed at all But it turns out that there is an outer dust ring that is about 24 million kilometers in diameter composed of dust grains that do not reflect visible light Because of that it hasn t been seen before NASA has a short very short press release showing an artist s concep Read more about Saturn s Ring System Just Got Bigger Log in to post comments Galaxy Zoologists Wanted Submitted by Roland Roberts on Wed 11 04 2009 10 42 Here s a project in need of part time volunteers Classifying galaxies Yep you too can become a galactic zoologist You can find a short teaser on the Astronomy Picture of the Day web site APOD Oct 26 2009 with more details at the official Galaxy Zoo web site Makes a good family game with older kids too How would you classify that galaxy Read more about Galaxy Zoologists Wanted Log in to post comments Inquiry Based Science Lessons Submitted by Roland Roberts on Thu 10 29 2009 11 23 Another generic resource also from the NSTA elementary mailing list The issue of using inquiry in science lessons is a big deal and also came up a recent School Leadership Team meeting Inquiry does of course get used but it s always a tough item since it is easy to get off script when using a lesson plan that allows student driven inquiry At the same time it s hard to really teach science without it The issue in NYC and probably many other places is that since the city has instituted standardized science testing the test is naturally content based Read more about Inquiry Based Science Lessons Log in to post comments Science Resources for Teachers Submitted by Roland Roberts on Thu 10 29 2009 11 05 Today I am at jury duty here in King s County That means for now anyway that I m waiting for my name to be called while the machinations of justice do their thing somewhere else in the building But the court system has moved into the modern age at least in some ways like providing free wifi here in the jury assembly room So I can catch up on a little reading from the National Science Teachers Assocation NSTA elementary level mailing list Read more about Science Resources for Teachers Log in to post comments Pages first previous 1 2 3 4 5 6 7 8 9 next last Navigation Calendar Gallery Constellations Messier Objects M27 The Dumbell Nebula Resources Astronomy Books Buying A Star Buying A Telescope Clubs and Organizations General Interest Imaging and Astrophotography Magazines Mailing Lists and News Groups Science Toy Suppliers Software Weather Information Tips and Tricks Roland s Corner Recent content About Copyright Search form Search

    Original URL path: http://www.astrofoto.org/blog/5?page=4&destination=blog/5 (2016-02-13)
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  • Roland Roberts's blog | astrofoto.org
    Oct 16 the crescent moon will have joined the fray and there will be a nice visual grouping of the three planets with the moon Read more about Saturn Week Log in to post comments Urban Starfest on Saturday Submitted by Roland Roberts on Fri 09 25 2009 10 53 If you are New York City this weekend is the annual Urban Starfest held in Sheep Meadow Central Park While those of you from more rural areas may think it something of a joke to have a mini star party in the middle of the a major city you would be surprised at what you can see Of course at this time the first quarter moon and Jupiter are easily visible in the early evening and those alone are worth the trip out if you or your children have never looked at them through a telescope And with some of the scopes the brighter deep sky objects will be readily d Read more about Urban Starfest on Saturday Log in to post comments astrofoto org down time Submitted by Roland Roberts on Mon 08 31 2009 02 10 I had a rather long outage due to a botched upgrade from which I am still recovering I had planned on upgrading from Fedora 8 to 9 then 10 and finally 11 You have to upgrade incrementally but the first step failed part way through after having started installing packages An attempt to retry crashed even earlier At that point I decided to try a clean install of Fedora 11 while preserving my data partitions then recover configuration files from backup That failed too Sigh Read more about astrofoto org down time Log in to post comments Pleiades M45 in Taurus Submitted by Roland Roberts on Fri 08 28 2009 23 14 While at the Summer Star Party after taking all those frames of the double cluster I decided to try M45 the Pleiades G2 41188 class g2image centered Read more about Pleiades M45 in Taurus Log in to post comments Pages first previous 2 3 4 5 6 7 8 9 10 next last Navigation Calendar Gallery Constellations Messier Objects M27 The Dumbell Nebula Resources Astronomy Books Buying A Star Buying A Telescope Clubs and Organizations General Interest Imaging and Astrophotography Magazines Mailing Lists and News Groups Science Toy Suppliers Software Weather Information Tips and Tricks Roland s Corner Recent content About Copyright Search form Search User login Username Password Request new password Science Daily Mercury Mercury gets a meteoroid shower from Comet Encke Mercury gets a meteoroid shower from Comet Encke More Science Daily Venus The aliens are silent because they re dead The aliens are silent because they re dead More Science Daily Mars Antarctic fungi survive Martian conditions on the International Space Station Antarctic fungi survive Martian conditions on the International Space Station Rotation speed may be bad news for Red Planet pioneers Rotation speed may be bad news for Red Planet pioneers The aliens are silent because

    Original URL path: http://www.astrofoto.org/blog/5?page=5&destination=blog/5 (2016-02-13)
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  • Roland Roberts's blog | astrofoto.org
    to get out under the stars such as they are here in Brooklyn even when I did have time it has rarely been possible Read more about Rain Rain Go Away Log in to post comments NEAF and NEAIC Until Next Year Submitted by Roland Roberts on Mon 04 20 2009 11 32 We returned last night tired but happy from this year s NEAF conference The vendor turn out was good and overall attendance appeared good too although it was little hard to tell from our perspective We spent most of the two days in the children s area helping with the various activities including a comet demonstration followed by a craft activity making 3D constellation models Orion and the Big Dipper some informal demonstrations to understand the moon s phases constructing spacecraft models and more Alas I did not get to attend the showing of Mars 3D a new movie which made its debut at the show so I guess I will have to wait for it to be officially released Read more about NEAF and NEAIC Until Next Year Log in to post comments NEAIC Tonal Mapping Submitted by Roland Roberts on Fri 04 17 2009 09 53 J P Metsainio is giving a talk on his techniques for using narrow band imaging to produce very sharp high contrast color images The technique appears to be a very clever application of the idea of using lower resolution in the color channels and blurring the noise to reduce grain Read more about NEAIC Tonal Mapping Log in to post comments NEAIC In Progress Submitted by Roland Roberts on Thu 04 16 2009 10 09 Well I ve made it to NEAIC again This year promises to be better than ever with an opening talk by Tony Hallas discussing CCD Noise I m sitting here listening to him now Vendors have contributed some very nice goodies for Friday s raffle and some of the vendors aren t even here Read more about NEAIC In Progress Log in to post comments Pages first previous 3 4 5 6 7 8 9 10 11 next last Navigation Calendar Gallery Constellations Messier Objects M27 The Dumbell Nebula Resources Astronomy Books Buying A Star Buying A Telescope Clubs and Organizations General Interest Imaging and Astrophotography Magazines Mailing Lists and News Groups Science Toy Suppliers Software Weather Information Tips and Tricks Roland s Corner Recent content About Copyright Search form Search User login Username Password Request new password Science Daily Mercury Mercury gets a meteoroid shower from Comet Encke Mercury gets a meteoroid shower from Comet Encke More Science Daily Venus The aliens are silent because they re dead The aliens are silent because they re dead More Science Daily Mars Antarctic fungi survive Martian conditions on the International Space Station Antarctic fungi survive Martian conditions on the International Space Station Rotation speed may be bad news for Red Planet pioneers Rotation speed may be bad news for Red Planet pioneers The aliens are

    Original URL path: http://www.astrofoto.org/blog/5?page=6&destination=blog/5 (2016-02-13)
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  • Roland Roberts's blog | astrofoto.org
    standard unpowered microphones into a pair of powered microphones for stereo input the process was amazingly straightforward I did a quick proof of concept in the dining room one evening and go Read more about How Fast is Sound Log in to post comments Ansel Adams Trivia Submitted by Roland Roberts on Fri 01 30 2009 11 31 I just read this in Astronomy Beat 15 a publication of the Astronomical Society of the Pacific Read more about Ansel Adams Trivia Log in to post comments 365 Days of Astronomy Submitted by Roland Roberts on Thu 01 29 2009 16 48 As part of the International Year of Astronomy you can find a daily podcast on astronomy at http 365daysofastronomy org Read more about 365 Days of Astronomy Log in to post comments Milky Way Gets a Little Bigger Submitted by Roland Roberts on Tue 01 06 2009 16 17 There s a New York Times Science article from yesterday reporting on recent measurements indicating that the Milky Way our home galaxy is bigger than previously thought We now qualify as a peer of the Andromeda galaxy The critical measurement was how fast we revolve around the galactic center The faster we re going the more massive our galaxy must be to hold us in Read more about Milky Way Gets a Little Bigger Log in to post comments Math Evolver needs to evolve a bit more Submitted by Roland Roberts on Mon 12 29 2008 22 34 Math Evolver is a game by DimensionM used to teach pre algebra to middle school students While perhaps not quite as exciting as Halo its very good Good enough that my older son is willing to actually think in order to play the game at least when I won t let him play Halo which of course requires very little thinking Read more about Math Evolver needs to evolve a bit more Log in to post comments Pages first previous 4 5 6 7 8 9 10 11 12 next last Navigation Calendar Gallery Constellations Messier Objects M27 The Dumbell Nebula Resources Astronomy Books Buying A Star Buying A Telescope Clubs and Organizations General Interest Imaging and Astrophotography Magazines Mailing Lists and News Groups Science Toy Suppliers Software Weather Information Tips and Tricks Roland s Corner Recent content About Copyright Search form Search User login Username Password Request new password Science Daily Mercury Mercury gets a meteoroid shower from Comet Encke Mercury gets a meteoroid shower from Comet Encke More Science Daily Venus The aliens are silent because they re dead The aliens are silent because they re dead More Science Daily Mars Antarctic fungi survive Martian conditions on the International Space Station Antarctic fungi survive Martian conditions on the International Space Station Rotation speed may be bad news for Red Planet pioneers Rotation speed may be bad news for Red Planet pioneers The aliens are silent because they re dead More Science Daily Jupiter New study challenges Jupiter s role as

    Original URL path: http://www.astrofoto.org/blog/5?page=7&destination=blog/5 (2016-02-13)
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  • Roland Roberts's blog | astrofoto.org
    see Upcoming Events in the sidebar The week s activities focus on in school lesson plans with suitable opportunities to do the in class out of doors The American Geological Institudte is sponsoring the activities and have put together some material on the Earth Science Week web site for students and teachers Read more about No Child Left Inside Log in to post comments Mercury Flyby Submitted by Roland Roberts on Tue 10 07 2008 11 47 On Monday Oct 6 MESSENGER made it s second pass around Mercury The spacecraft doesn t have enough fuel to just pull up to the planet Star Trek style so it has to make a series of looping passes shedding a little velocity and angular momentum each time But it wasn t all navigational changes MESSENGER took the opportunity to take a few more pictures as it flew past Details are at the official web site Read more about Mercury Flyby Log in to post comments A Little Less Light NY Times Submitted by Roland Roberts on Tue 10 07 2008 11 42 There is a short opinion piece at the NY Times web site called A Little Less Light which makes good reading Read more about A Little Less Light NY Times Log in to post comments Mag 5 skies in Brooklyn Submitted by Roland Roberts on Fri 10 03 2008 20 58 Well not quite but if you re in NYC and reading this tonight Oct 3 go outside I spent a few minutes on our front stoop around 7 15 pm and noticed how clear the sky seemed to be Then using my hand to block out the street light at the end our our cul de sac I let my eyes adjust as was surprised to notice that I could see all four stars in the body of Delphinus The faintest of these is delta Dephini is listed as magnitude 4 43 Read more about Mag 5 skies in Brooklyn Log in to post comments Pages first previous 5 6 7 8 9 10 11 12 13 next last Navigation Calendar Gallery Constellations Messier Objects M27 The Dumbell Nebula Resources Astronomy Books Buying A Star Buying A Telescope Clubs and Organizations General Interest Imaging and Astrophotography Magazines Mailing Lists and News Groups Science Toy Suppliers Software Weather Information Tips and Tricks Roland s Corner Recent content About Copyright Search form Search User login Username Password Request new password Science Daily Mercury Mercury gets a meteoroid shower from Comet Encke Mercury gets a meteoroid shower from Comet Encke More Science Daily Venus The aliens are silent because they re dead The aliens are silent because they re dead More Science Daily Mars Antarctic fungi survive Martian conditions on the International Space Station Antarctic fungi survive Martian conditions on the International Space Station Rotation speed may be bad news for Red Planet pioneers Rotation speed may be bad news for Red Planet pioneers The aliens are silent because they re dead

    Original URL path: http://www.astrofoto.org/blog/5?page=8&destination=blog/5 (2016-02-13)
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  • Roland Roberts's blog | astrofoto.org
    it was approved a week ago but the paperwork takes a while so it was only yesterday that it was finally ready Today I went over Prospect Park and picked it up As I was walking out I noticed it read no vehicles in the park at any time Oops Read more about PS 102 Stargazing Tonight Log in to post comments Response Coming Real Soon Now Submitted by Roland Roberts on Fri 04 28 2006 15 25 Okay that s not the actual words used and the front office person at the Mayor s Correspondence Unit was very polite and helpful In fact everyone I ve spoken to over there has been both courteous and professional and usually downright friendly It s the people I haven t been able to talk to that are the problem The correspondence unit is going to contact the people to whom the letter was sent and ask them to give me a call on Monday afternoon Okay Read more about Response Coming Real Soon Now Log in to post comments Trying to get the Mayor s attention Submitted by Roland Roberts on Thu 04 27 2006 20 29 For the past almost two months I ve been trying to get a response from the Mayor s office regarding the New York bill A7404 S4474 The Healthy Safe and Energy Efficient Outdoor Lighting Act It s seeming like a lost cause Read more about Trying to get the Mayor s attention Log in to post comments PS102 Stargazing Postponed Submitted by Roland Roberts on Tue 04 25 2006 21 58 The original plan was to meet in Shore Road Park near the ball fields across from the 77th Street entrance around 7 30pm But the weather wasn t cooperative in spite of it looking wonderful nearly all day The forecast was for it to turn cloudy and rainy around 7pm and the clouds rolled in pretty close to on schedule Rain date is this Saturday same time and place Read more about PS102 Stargazing Postponed Log in to post comments Pages first previous 7 8 9 10 11 12 13 14 15 Navigation Calendar Gallery Constellations Messier Objects M27 The Dumbell Nebula Resources Astronomy Books Buying A Star Buying A Telescope Clubs and Organizations General Interest Imaging and Astrophotography Magazines Mailing Lists and News Groups Science Toy Suppliers Software Weather Information Tips and Tricks Roland s Corner Recent content About Copyright Search form Search User login Username Password Request new password Science Daily Mercury Mercury gets a meteoroid shower from Comet Encke Mercury gets a meteoroid shower from Comet Encke More Science Daily Venus The aliens are silent because they re dead The aliens are silent because they re dead More Science Daily Mars Antarctic fungi survive Martian conditions on the International Space Station Antarctic fungi survive Martian conditions on the International Space Station Rotation speed may be bad news for Red Planet pioneers Rotation speed may be bad news for Red Planet pioneers

    Original URL path: http://www.astrofoto.org/blog/5?page=14&destination=blog/5 (2016-02-13)
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  • Painful Drupal 7 Migration
    tweak things until it morphs back into something closer But that s not the painful part There s really no clean way to upgrade from Drupal 6 to 7 Or if there is it s very well hidden Finally I found the various components of the Migrate API and modules They mostly get you there I was even able to migrate all my old events into the new structures and they came over cleanly But as a user of the various old image modules I was pretty frustrated Most of them don t come over very cleanly I spent a long time editing old nodes to relink images The Gallery2 node with rotating images is gone maybe never to return Of course Gallery2 has been orphaned so that s another problem But the biggest pain that shouldn t have existed All book connections were lost So I had to go through and rebuild all the books Every one I can t imagine what it would have been like if this had been a truly large web site You would think that a migration procedure that automatically recognizes the old site has books and the new site has books and would

    Original URL path: http://www.astrofoto.org/print/1436?destination=node/1436 (2016-02-13)
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  • Preliminary Testing of Focal Reducers and the Mighty Mini for Occulation Timing
    short of the ideal spacing It s worth noting that ideal here means the working distance that produces the actual 0 5x reduction factor Putting it a little closer does three things First it insures there is no vignetting by the reducer mounting Second it gives us a little wider field of view in that off axis rays would be the first to be vignetted having the reducer closer to the focal plane means the original light cone will have had more room converge so that vignetting will also be reduced Third it changes the reduction factor Measuring the OWL Focal Reducer Focal Length I recently had a chance to measure the focal length of the Tasco 50mm binocular objective for which this system was nominally optimized Ideally I should simply have some focuser system and then I can adjust the spacing and measure or even better take and image and do a plate fit to get the image scale What I actually was able to do is put in various combination of spacers and adapters to see where I get my best focus Since I don t have a wide range of spacers I m stuck with limited combinations In a few cases I attempted unscrewing an adapter by 1mm but that comes with issues rated to tilting the focal plane The whole assembly tends to droop a little when things are not screwed down tight which means the image shifts and I m measuring off axis focus which will naturally be a little worse I have the following spacers and adapters available 0 65 C to 1 25 adapter 16 5mm 1 C to 1 25 adapter 24 5mm 5mm C to Cs adapter 0 5 long 1 25 extender 12 5mm 1 5 long 1 25 extender 38 1mm The best focus came was when using th 1 C to 1 25 adapter plus th 1 5 extender two 0 5 adapters for a total of 62 6mm spacing from the back flange of the focal reducer to the camera flange The C mount flange to focal plane distance is another 12 5mm giving a total of 74 6mm plus whatever spacing there is from the back flange of the OWL focal reducer to the optical center Some crude measurements indicate the spacing to the geometric center of the lens is probably 3mm It s a crude measurement but I think we re safe in assuming the nominal 76mm FL for the OWL reducer is correct actually we know the OWL reducer is 76mm the question is whether or not the reducer bought off eBay is the real deal the answer is probably yes Measuring the Focal Length of the Tasco 50mm Binocular Objective To do this I kept attaching extender tubes to the nosepiece of a Meade DSI Pro II until I could achieve focus when the whole thing was attached to the back of the Mighty Mini in place of the PC164 EX2 I strapped

    Original URL path: http://www.astrofoto.org/print/1434?destination=node/1434 (2016-02-13)
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