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Another run with 30 s resolution. Refined ensemble selection and added visual ensemble/check star control – much better precision, albeit the seeing was pretty bad and clouds began to appear in the middle and near the end of the run. The routine handled the situations well. Hopefully fully prepared to try to catch those eclipses.
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30 s resolution, CV mode.
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Sorry for double posting, it looks like I only have limited time available to edit my previous post. The 6-h period disappeared with today’s data, so it was spurious and likely me not understanding how to use FALC. I now realize it requires manual manipulation with light curve segments to bring them down to the same magnitude level, so I dropped this idea. With today’s data, I have fitted a high-degree polynomial to “detrend” data assuming eclipses also occur in the outburst state, and many algorithms converge on a 4.52-h period appearing in the residuals. Although, still, more observations are obviously needed. I also wonder if I should search eclipses in the quiescent data only.
Max
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Today CG Dra was at it’s brightest ever recorded during the past 2 years.
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Got some interesting result on the data collected. Although probably spurious, the period is really close to the 6h 22m +/- 26 m period for a matching K5 main sequence star mentioned in Bruch et al. (1997). I’ve never used FALC before, so not sure if this power is of any significance, likely not?
Max
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Looks like it’s in outburst.
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More data on May 13th.
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Thanks, Jeremy! With tonight data..
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Had a run on CG Dra tonight.
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I wonder if there are any campaigns to monitor this object. Any guidelines? Anything we can contribute with?
Hi Gary,
I do not see it at 13.6. Here is a 120 s V-band exposure of the field. It is supposed to be right next to the marked 15.86 star.
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Robin, I wonder if this is due to the Swings effect and the varying g-factor producing different fluorescence intensities. Looks like the ratios in your data are within the range for CN. Please see attached two relevant pages from the book “Comets” by J. A. Fernandez.
Hi Paul,
Thank you very much for your feedback. This type of error occurs if the input to the linear regression function has a blank value, which is unexpected. This could be, for example, if the star catalog returns a blank magnitude for some reason, or the ensemble has zero stars (too limited). Is there an option for you to try a different star catalog? How many stars are in your ensemble? Please note no screenshot was attached.
Max
Sorry. Here is a working link: http://pure.southwales.ac.uk/files/1764788/stw3334.pdf
Thank you, Nick. Yes, we use ACP and a web front-end so users could submit plans easily. MetroPSF can now detect all minor planets and comets (all SkyBoT objects) – this version is to be released, but the plan is to build it into the front-end as well. The sensor is IMX455 – back-illuminated CMOS, that is correct.
My team is currently setting up a 17″ CDK in Spain with IMX455-based CMOS. It will have a user-friendly interface for reservation, plan generation, etc. The telescope is already operational, but we need now to finalize all the scripting, web front-end, logic, and a few other things. Here are more details about this endeavor:
I would like to negotiate donating a specific portion of time on this telescope to BAA. I would appreciate if someone could provide me with any pointers on how to start this. It has UBVRI set of Johnson/Bessel filters, in addition to LRGB, H-alpha, OIII and SII filters, so fully ready for photometry. In fact, we are thinking about connecting my MetroPSF program to the front-end, so if you need quick photometry you can just quickly specify the target and get fully reduced photometry – automated, even in real-time, if needed. (But that’s in the future…)
This is the first telescope our team is setting up and we would be very interested to be of use for BAA, especially if the data is used for scientific research and publications.
Maxim
Found this paper as well on dust shells that might be of interest.
