jnb
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Everything posted by jnb
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Besides being a very nice image and well documented for exposure times, focal rations and camera speeds (I'm amazed how many people don't mention those when they post images) it's a nice example of coma. I'd be interested to see the same image done with a skywatcher and baader coma corrector. I have a 150p-ds on order and was wondering how much I need a CC and whether the baader is worth the premium (or a revelation worth the discount)
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Marginally off topic ... Is there a great advantage (or any advantage at all for that matter) to getting a 150pds or orion optics VX6 over a 130 pds. My wife asked me if it would be worth getting something better when I talked about the 130pds. I notice the OTA weight for the VX6 is 4.5 Kg so it's barely more than the 130pds and with an option of 1/10 wave mirrors. The 1/10 wave might not be warranted under our skies but it suggests that the overall quality _might_ be better
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How many of you are successfully using smaller mounts with the 130pds? I can afford a 130pds but not a new mount which means using it on my exos2 (EQ5). Now everyone seems to say that the mount is the first thing you must get right and I'm not going to disagree with that but I can't afford an HEQ5 right now. So how successfully can one use an exos2 (eq5) / 130pds combination?
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What is the description under the user avatar and above their post count? A quick glance seems to suggest that everyone is in the "Advanced members" group.
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Sounds like a lot of projects I've done. Financially it makes no sense but it's interesting to do.
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How much did you pay for the blanks?
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From the album: jnb
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Miscellaneous stuff
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From the album: jnb
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The largest asteroid is Ceres which can reach a magnitude of about 7, which basically means that it is just below naked eye visibility so with good navigation and even the smallest of telescopes you can see Ceres. You won't see anything on it, just a point of light but it can be seen. For a lot of these targets it is the hunt that is fascinating not the view. I often compare it to bird watching. Seeing Jupiter is like watching a sparrow in your garden, seeing Pluto is more like seeing a faint distant blob on a cliff and knowing that it is a rare lesser spotted wotsit. And one correction asteroids reflect light like planets rather than shining like stars.
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From the album: jnb
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From the album: jnb
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untilOpen Evening at the Observatory Science Centre, Herstmonceux Weather permitting the telescopes in the main domes will be open for public observing, including the 13" astrographic refractor, 26" Thompson refractor and Thompson 30" reflector. Half term special - one child admitted free with each paying adult The Sun will have set at 5.28pm so it will be dark when The Centre opens at 6.30pm. The phase of the Moon is LAST QUARTER. It will already be high in the sky but sinking towards the western horizon, setting at 10.10pm so it will be visible for the first part of the evening. To see the sky charts for the 22nd February visit Heavens Above. You will need to alter the times and dates in the boxes below the current chart to find out what is in the night sky on the dates of the open evenings. Jupiter will already be high in the sky and will be visible all evening. It is in the constellation of Gemini (see sky chart from Heavens Above). It will be at MAGNITUDE -2.5 which is very bright. Jupiter reached OPPOSITION on the 5th January so on the 22nd February it will be getting further from Earth. The Gallilean Moons will all be visible at some stage during the evening. However, Io will disappear behind Jupiter at 6.26pm reappearing on the eastern side of the planet at 9.43pm. See OCCULTATION for further details. Callisto will already be passing in front of Jupiter when The Centre opens. see TRANSIT for further details. The transit will have begun at 5.34pm and will end at 8.58pm. Ganymede and Europa will be on the eastern side of Jupiter all evening. They will be very close together and will in fact cross over each other during the course of the night. The centre of Jupiter's GREAT RED SPOT will cross the central meridian (the imaginary line running from north to south) of the planet at 9.12pm and will be well placed for viewing for at least an hour before and after this time. Jupiter will be one of the main features of the evening but the Moon is also very beautiful to look at through a Moon filter attached to the eyepiece of the telescope. Other interesting celestial objects visible on the 22nd February include the ORION NEBULA. The smaller telescopes of Wealden Astronomical Society will be situated on the lawns at the front of the Centre and will also be available for you to look through. http://www.the-observatory.org/events http://www.the-obser...s#Open Evenings http://www.the-observatory.org/open_evenings1#Feb22
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untilOpen Evening at the Observatory Science Centre, Herstmonceux Weather permitting the telescopes in the main domes will be open for public observing, including the 13" astrographic refractor, 26" Thompson refractor and Thompson 30" reflector. The sun will have set at about 5.15pm so it will be dark when The Centre opens at 6.30pm. The phase of the Moon is 1 day after FULL MOON. It will rise at 6.13pm and will not set until 7.21am the following morning so it will be visible all night. To see the sky charts for the 15th February visit Heavens Above. You will need to alter the times and dates in the boxes below the current chart to find out what is in the night sky on the dates of the open evenings. Jupiter will already be high in the sky and will be visible all evening. It is in the constellation of Gemini (see sky chart from Heavens Above). It will be at MAGNITUDE -2.5 which is very bright. Jupiter reached OPPOSITION on the 5th January so on the 15th February it will be getting further from Earth. The Gallilean Moons will all be visible at some stage during the evening with Io reappearing on the eastern side of the planet at 7.48pm. Ganymede, Europa and Callisto will also be on the eastern side in that order from Jupiter outwards. However, during the evening Io and Ganymede will cross over each other. The centre of Jupiter's GREAT RED SPOT will cross the central meridian (the imaginary line running from north to south) of the planet at 8.25pm and will be well placed for viewing for at least an hour before and after this time. Jupiter will be one of the main features of the evening but the Moon is also very beautiful through the telescopes through a Moon filter. Other interesting celestial objects visible on the 15th February include the ORION NEBULA. The smaller telescopes of Wealden Astronomical Society will be situated on the lawns at the front of the Centre and will also be available for you to look through. http://www.the-observatory.org/events http://www.the-observatory.org/open-evenings#Open%20Evenings#Open Evenings http://www.the-observatory.org/open_evenings1#feb15
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