Arne Henden wrote (AAVS_-discussion Wed 11/03/2009 02:54): Several new campaigns have been initiated over the last few months as well, including long-term monitoring of the suspected eclipser V1412 Aql for Dr. Arlo Landolt. Although the campaign is a tough one, it is particularly exciting because the deep eclipses which Landolt and one other group observed in the 1980’s suggest that the white dwarf may be completely eclipsed by an extrasolar planet. A detection of another eclipse would be the first confirmed transiting exoplanet around a white dwarf star. We don’t know when or how often we expect to see eclipses, so if you have an open slot in your observing queue, please consider making a few measurements of this star!
Today, Christian Knigge (U Southampton) wrote (AAVSO-discussion Tue 1/09/2009 07:35): I hope you don’t mind me as a professional jumping in on this bandwagon, but I just wanted to let you know that I found the AAVSO Special Notice on this object so interesting that I got in touch with Arlo Landolt and, together with some other colleagues, have started monitoring this object with the robotic Liverpool Telescope (and, to a lesser extent, the Faulkes Telescopes). We’ve had almost daily coverage for about a month now, and while I’ve not yet had a chance to do proper data reduction and photometry, I’ve inspected the nightly images and have also not yet seen any sign of an eclipse so far. Coverage should continue at this rate for as long as V1412 stays visible this season.
However, the real reason for this post is that I thought Michel Bonnardeau’s simulation was *extremely* useful and interesting — great job! I will see if I can get the Liverpool Telescope to cover some of the upcoming “optimal” epochs for observations (i.e. the most likely times of eclipse), but since the award we have on this telescope is for monitoring type observations, it’s not clear if I will get extra coverage during these times.
With this in mind, I really just wanted to second the suggestion to hit this object hard, especially on Michel’s suggested likely eclipes dates.
And even beyond those dates, please don’t assume that the LT and FT coverage removes the need for amateur observations: another thing Michel’s simulations show quite nicely is that *breadth* of coverage is critical — even though the daily sampling we get with LT/FT is very nice, it only provides a brief snapshot each night…
Plainly, there is scope for coverage at AU/NZ longitudes in particular. I’d encourage all observers with larger scopes and CCDs which can reach comforatably below V=16, to check it out every night. Immediate reporting of a fade is important,. and if you find one, start a time-series. Please see the Special Notice re reporting details, charts, etc.
Michel Bonnardeau (URL below) has carried out a Monte Carlo simulation to find likely eclipse times, based on the two observed fadings, and the 600 negative observations in the AAVSO database. Probable UT times in September are 7th @ 21h; 12th @