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  • User login | astrofoto.org
    Simulating the jet streams and anticyclones of Jupiter and Saturn More Science Daily Saturn Cassini completes final close Enceladus flyby Cassini completes final close Enceladus flyby How water escapes from Saturn Magnetic reconnection How water escapes from Saturn Magnetic reconnection Explosive energy in Saturn s magnetic bubble More Science Daily Neptune Evidence of a real ninth planet discovered Evidence of a real ninth planet discovered Mars to lose its largest moon Phobos but gain a ring Mars to lose its largest moon Phobos but gain a ring Simulation of 3 D exotic clouds on an exoplanet More Science Daily Uranus Jupiter bumped giant planet from our solar system This solar system isn t big enough for the both of us Jupiter More Science Daily Pluto Earth like planets have Earth like interiors Earth like planets have Earth like interiors Evidence of a real ninth planet discovered Evidence of a real ninth planet discovered New Horizons returns first of the best images of Pluto More Science Daily Comets and Asteroids Earth like planets have Earth like interiors Earth like planets have Earth like interiors Artistic space odyssey to broadcast people s messages to the stars Artistic space odyssey to broadcast people s messages to the stars New study challenges Jupiter s role as planetary shield protecting Earth from comet impacts More Science Daily Kuiper Belt Earth like planets have Earth like interiors Earth like planets have Earth like interiors Evidence of a real ninth planet discovered Evidence of a real ninth planet discovered New Horizons returns first of the best images of Pluto More Astronomy News NASA s Great Observatories Weigh Massive Young Galaxy Cluster Galvanized by Genuine Research Experiences NITARP Program Alumni Flock to International Astronomy Conference Discovering Our Universe from the Classroom Teacher Program Brings NASA Research to Schools

    Original URL path: http://www.astrofoto.org/user/login?destination=node/1435%23comment-form (2016-02-13)
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  • Preliminary Testing of Focal Reducers and the Mighty Mini for Occulation Timing | astrofoto.org
    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 the binocular objective onto an Alt Az mount and pointed the whole thing at Polaris then took a 20 second exposure and used MaximDL 6 to do a plate fit This gave a focal length of 184mm I ve done the same thing with the Orion 9x50 objective and got 183mm So for all practical purposes these two are identical I d say using one or the other has no significant performance benefit but the Tasco is clearly cheaper This gives an effective f number of 3 66 183mm 50mm At that focal ratio the 2nd Airy disk minimum has a diameter of 4 1μm for 500nm green light 2 23 λF D In his analysis Hristro Pavlov mentions he believes the PC164 EX2 uses the Sony ICX419ALL chip which has 8 6μm x 8 3μm pixels so we re already good in putting all of the light from a star into a single pixel maximizing our sensitivity Assuming we re diffraction limited which is questionable based on some other tests Use of the focal reducer for these finders doesn t do anything to improve the sensitivity of the camera instead it increases the field of view making it easier to point them adequately Remember the field of view is more than 2 4 x3 2 with the reducer and you re trying to point blindly no finder no telrad no anything to point accurately It s the increase field of view which is the big win Footnotes This was done using the image object distance measurements I focused a room light onto a wall using the focal reducer and measured the distance from the focal reducer lens center to the wall at 101mm The distance from the wall to the light was 1968mm give or take a few so the distance to the light from the lens was 1867 This gives begin eqnarray 1 over f 1 over l 1 over l 1

    Original URL path: http://www.astrofoto.org/node/1434 (2016-02-13)
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  • IOTA | astrofoto.org
    study challenges Jupiter s role as planetary shield protecting Earth from comet impacts New study challenges Jupiter s role as planetary shield protecting Earth from comet impacts NASA telescopes detect Jupiter like storm on small star NASA telescopes detect Jupiter like storm on small star Simulating the jet streams and anticyclones of Jupiter and Saturn More Science Daily Saturn Cassini completes final close Enceladus flyby Cassini completes final close Enceladus flyby How water escapes from Saturn Magnetic reconnection How water escapes from Saturn Magnetic reconnection Explosive energy in Saturn s magnetic bubble More Science Daily Neptune Evidence of a real ninth planet discovered Evidence of a real ninth planet discovered Mars to lose its largest moon Phobos but gain a ring Mars to lose its largest moon Phobos but gain a ring Simulation of 3 D exotic clouds on an exoplanet More Science Daily Uranus Jupiter bumped giant planet from our solar system This solar system isn t big enough for the both of us Jupiter More Science Daily Pluto Earth like planets have Earth like interiors Earth like planets have Earth like interiors Evidence of a real ninth planet discovered Evidence of a real ninth planet discovered New Horizons returns first of the best images of Pluto More Science Daily Comets and Asteroids Earth like planets have Earth like interiors Earth like planets have Earth like interiors Artistic space odyssey to broadcast people s messages to the stars Artistic space odyssey to broadcast people s messages to the stars New study challenges Jupiter s role as planetary shield protecting Earth from comet impacts More Science Daily Kuiper Belt Earth like planets have Earth like interiors Earth like planets have Earth like interiors Evidence of a real ninth planet discovered Evidence of a real ninth planet discovered New Horizons returns

    Original URL path: http://www.astrofoto.org/taxonomy/term/21 (2016-02-13)
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  • Mighty Mini | astrofoto.org
    New study challenges Jupiter s role as planetary shield protecting Earth from comet impacts New study challenges Jupiter s role as planetary shield protecting Earth from comet impacts NASA telescopes detect Jupiter like storm on small star NASA telescopes detect Jupiter like storm on small star Simulating the jet streams and anticyclones of Jupiter and Saturn More Science Daily Saturn Cassini completes final close Enceladus flyby Cassini completes final close Enceladus flyby How water escapes from Saturn Magnetic reconnection How water escapes from Saturn Magnetic reconnection Explosive energy in Saturn s magnetic bubble More Science Daily Neptune Evidence of a real ninth planet discovered Evidence of a real ninth planet discovered Mars to lose its largest moon Phobos but gain a ring Mars to lose its largest moon Phobos but gain a ring Simulation of 3 D exotic clouds on an exoplanet More Science Daily Uranus Jupiter bumped giant planet from our solar system This solar system isn t big enough for the both of us Jupiter More Science Daily Pluto Earth like planets have Earth like interiors Earth like planets have Earth like interiors Evidence of a real ninth planet discovered Evidence of a real ninth planet discovered New Horizons returns first of the best images of Pluto More Science Daily Comets and Asteroids Earth like planets have Earth like interiors Earth like planets have Earth like interiors Artistic space odyssey to broadcast people s messages to the stars Artistic space odyssey to broadcast people s messages to the stars New study challenges Jupiter s role as planetary shield protecting Earth from comet impacts More Science Daily Kuiper Belt Earth like planets have Earth like interiors Earth like planets have Earth like interiors Evidence of a real ninth planet discovered Evidence of a real ninth planet discovered New Horizons

    Original URL path: http://www.astrofoto.org/taxonomy/term/22 (2016-02-13)
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  • Astronomy | astrofoto.org
    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 planetary shield protecting Earth from comet impacts New study challenges Jupiter s role as planetary shield protecting Earth from comet impacts NASA telescopes detect Jupiter like storm on small star NASA telescopes detect Jupiter like storm on small star Simulating the jet streams and anticyclones of Jupiter and Saturn More Science Daily Saturn Cassini completes final close Enceladus flyby Cassini completes final close Enceladus flyby How water escapes from Saturn Magnetic reconnection How water escapes from Saturn Magnetic reconnection Explosive energy in Saturn s magnetic bubble More Science Daily Neptune Evidence of a real ninth planet discovered Evidence of a real ninth planet discovered Mars to lose its largest moon Phobos but gain a ring Mars to lose its largest moon Phobos but gain a ring Simulation of 3 D exotic clouds on an exoplanet More Science Daily Uranus Jupiter bumped giant planet from our solar system This solar system isn t big enough for the both of us Jupiter More Science Daily Pluto Earth like planets have Earth like interiors Earth like planets have Earth like interiors Evidence of a real ninth planet discovered Evidence of a real ninth planet discovered New Horizons returns first of the best images of Pluto More Science Daily Comets and Asteroids Earth like planets have Earth like interiors Earth like planets have Earth

    Original URL path: http://www.astrofoto.org/taxonomy/term/6 (2016-02-13)
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  • User login | astrofoto.org
    Simulating the jet streams and anticyclones of Jupiter and Saturn More Science Daily Saturn Cassini completes final close Enceladus flyby Cassini completes final close Enceladus flyby How water escapes from Saturn Magnetic reconnection How water escapes from Saturn Magnetic reconnection Explosive energy in Saturn s magnetic bubble More Science Daily Neptune Evidence of a real ninth planet discovered Evidence of a real ninth planet discovered Mars to lose its largest moon Phobos but gain a ring Mars to lose its largest moon Phobos but gain a ring Simulation of 3 D exotic clouds on an exoplanet More Science Daily Uranus Jupiter bumped giant planet from our solar system This solar system isn t big enough for the both of us Jupiter More Science Daily Pluto Earth like planets have Earth like interiors Earth like planets have Earth like interiors Evidence of a real ninth planet discovered Evidence of a real ninth planet discovered New Horizons returns first of the best images of Pluto More Science Daily Comets and Asteroids Earth like planets have Earth like interiors Earth like planets have Earth like interiors Artistic space odyssey to broadcast people s messages to the stars Artistic space odyssey to broadcast people s messages to the stars New study challenges Jupiter s role as planetary shield protecting Earth from comet impacts More Science Daily Kuiper Belt Earth like planets have Earth like interiors Earth like planets have Earth like interiors Evidence of a real ninth planet discovered Evidence of a real ninth planet discovered New Horizons returns first of the best images of Pluto More Astronomy News NASA s Great Observatories Weigh Massive Young Galaxy Cluster Galvanized by Genuine Research Experiences NITARP Program Alumni Flock to International Astronomy Conference Discovering Our Universe from the Classroom Teacher Program Brings NASA Research to Schools

    Original URL path: http://www.astrofoto.org/user/login?destination=node/1434%23comment-form (2016-02-13)
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  • ASI120MM Astronomy Camera | astrofoto.org
    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 planetary shield protecting Earth from comet impacts New study challenges Jupiter s role as planetary shield protecting Earth from comet impacts NASA telescopes detect Jupiter like storm on small star NASA telescopes detect Jupiter like storm on small star Simulating the jet streams and anticyclones of Jupiter and Saturn More Science Daily Saturn Cassini completes final close Enceladus flyby Cassini completes final close Enceladus flyby How water escapes from Saturn Magnetic reconnection How water escapes from Saturn Magnetic reconnection Explosive energy in Saturn s magnetic bubble More Science Daily Neptune Evidence of a real ninth planet discovered Evidence of a real ninth planet discovered Mars to lose its largest moon Phobos but gain a ring Mars to lose its largest moon Phobos but gain a ring Simulation of 3 D exotic clouds on an exoplanet More Science Daily Uranus Jupiter bumped giant planet from our solar system This solar system isn t big enough for the both of us Jupiter More Science Daily Pluto Earth like planets have Earth like interiors Earth like planets have Earth like interiors Evidence of a real ninth planet discovered Evidence of a real ninth planet discovered New Horizons returns first of the best images of Pluto More Science Daily Comets and Asteroids Earth like planets have Earth like interiors Earth like planets have Earth like interiors Artistic space odyssey to broadcast

    Original URL path: http://www.astrofoto.org/node/1257 (2016-02-13)
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  • User login | astrofoto.org
    Simulating the jet streams and anticyclones of Jupiter and Saturn More Science Daily Saturn Cassini completes final close Enceladus flyby Cassini completes final close Enceladus flyby How water escapes from Saturn Magnetic reconnection How water escapes from Saturn Magnetic reconnection Explosive energy in Saturn s magnetic bubble More Science Daily Neptune Evidence of a real ninth planet discovered Evidence of a real ninth planet discovered Mars to lose its largest moon Phobos but gain a ring Mars to lose its largest moon Phobos but gain a ring Simulation of 3 D exotic clouds on an exoplanet More Science Daily Uranus Jupiter bumped giant planet from our solar system This solar system isn t big enough for the both of us Jupiter More Science Daily Pluto Earth like planets have Earth like interiors Earth like planets have Earth like interiors Evidence of a real ninth planet discovered Evidence of a real ninth planet discovered New Horizons returns first of the best images of Pluto More Science Daily Comets and Asteroids Earth like planets have Earth like interiors Earth like planets have Earth like interiors Artistic space odyssey to broadcast people s messages to the stars Artistic space odyssey to broadcast people s messages to the stars New study challenges Jupiter s role as planetary shield protecting Earth from comet impacts More Science Daily Kuiper Belt Earth like planets have Earth like interiors Earth like planets have Earth like interiors Evidence of a real ninth planet discovered Evidence of a real ninth planet discovered New Horizons returns first of the best images of Pluto More Astronomy News NASA s Great Observatories Weigh Massive Young Galaxy Cluster Galvanized by Genuine Research Experiences NITARP Program Alumni Flock to International Astronomy Conference Discovering Our Universe from the Classroom Teacher Program Brings NASA Research to Schools

    Original URL path: http://www.astrofoto.org/user/login?destination=node/1257%23comment-form (2016-02-13)
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