Posted 16 January 2011 - 01:36 PM
Thanks for the link. looks like an interesting one ( especially as it includes the software as well). Do you know when the book was first published ? (I have some books from Willman-Bell that while being very good for their time are a little antedated because they dont cover the most recent stuff on the market.)
I am still interested in in other responses by other variable star obdservers.
Posted 16 January 2011 - 03:27 PM
Try this book by Bruce Gary (exoplanet specific but v/ good)
This one is also quite good.
Posted 16 January 2011 - 04:45 PM
I know what you mean about some of the W-B titles being out of date.
However, the Image Processing handbook is the second edition from 2005. I have the 3rd printing of the book from 2009, and the AIP4WIN software included with it is version 2.3.1, which is fairly recent (I think).
The book includes a good discussion of many basic principles of image calibration, signal-to-noise, characterizing your CCD performance, etc., that are applicable to both astrophotography and photometry. I like it but I still have a lot to learn.
Posted 16 January 2011 - 04:53 PM
Thanks for the links.
Exoplanets are interesting - I will look into this
Posted 16 January 2011 - 04:56 PM
Thanks. I will probably order it directly from W-B
too bad they rip you off on international shipping rates.
Posted 16 January 2011 - 06:55 PM
I got my copy direct from: http://www.minorplanetobserver.com/ but I image Amazon carries it as well.
Posted 17 January 2011 - 03:20 AM
Thanks - looks like a very useful one I will order this soon.
Posted 17 January 2011 - 03:48 AM
Just ordered Brian warner's book from Amazon.
Supposed to reach me only on mid February :bangbangbang:
In the meantime I will try reading the PDF books recommended by Gavin (already downloaded).
Thanks everybody for the links and recommendations
Any other intresting primers or more advanced references or books ?
Posted 17 January 2011 - 07:43 AM
No - thanks for pointing this out. I will read it.
Incidentally I thought in order to use AAVSO website you need to be a member ?
Posted 21 December 2013 - 06:16 PM
Posted 21 December 2013 - 09:56 PM
Give it a try, what could possibly go wrong?
Posted 26 December 2013 - 06:25 PM
Posted 26 December 2013 - 08:27 PM
I think that if you nose around the Citizen Sky site, sign up, do a bit of reading and research you will find most of your answers. I say this not because I am withholding information but because I don't have authoritative answers; but the folks at Citizen Sky probably do.
Posted 29 December 2013 - 04:46 PM
In principle, yes you could convert "G" from the RGB system to "V" from UBVRcIc typically used for photometry. For example VT from the Tycho-2 catalog is not exactly equal to V from the Johnson-Cousins system. Nonetheless, when VT values collected with the Hipparcos satellite are compared to reference V values determined elsewhere, within reason a relationship can be established between the two magnitude systems [ie. VT - 0.090 * (BT - VT)]. Note however, that in this case BT values are also required. The formulae are actually much more complicated and depend upon the range of (BT-VT). This should in no way discourage you from using the G channel from a color camera to produce lightcurves from a number of targets including asteroids, variable stars, stars with potential exo-planets, or even some extended star-like objects (eg quasars). This is particularly true for anyone who is simply trying out photometry as an alternate to visual observing or astrophotography. Indubitably if you intend to regularly publish your data, you should consider purchasing a purpose-built, temperature-controlled, non-antiblooming ccd camera equipped with photometric filters. That does not, however, preclude the use of a mono- or color-webcam, dslr or single-shot color ccd camera which can produce publishable lightcurves from minor planets or prove the existence of a new variable star.