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I’ve posted a much better effort on my member’s page. With my first go, I thought stacking and sharpening a load of images (a la planetary imaging) would help things, but I think it actually blurred the spectrum – and the bit depth was 8 bit anyhow. This time I was careful with focusing and made sure the exposure wasn’t too high. I think the result is much better. Unfortunately the ADU of my camera is 14 rather than 16 bit, so there’s not quite as much data as there could be.
Yes, I think overexposure is likely. I’ll look into the brightness values. Vega of course is low in the evening, and with this being early days (in spec) for me, I thought I’d go for a convenient target from my backyard. Thanks Hugh – David
I’ve carried out my first capture. Not an ideal target I gather, but the weather isn’t cooperating! I’ve done the wavelength calibration – with the star image and hydrogen alpha line. Focus is definitely something I’ll work on; and exposure time too. DavidThanks for pointing this out Denis. At the end of the Wiki article, Bopp is quoted as having said something I wholeheartedly agree with:
“I’ll never give up looking at the skies. There’s so many beautiful things there. And I love to share that with people.”
Thanks Nick. According to the Beeb, the Hawaiian name for 1I/2017 U1 is pronounced oh MOO-uh MOO-uh.
I’ve just solved the image in Astrometrica. The software also dabbles in photometry: the estimate is 15.1 CV (unfiltered CCD with V mag zeropoint).
Hello,I noticed a clear patch when putting the bin out and got 45 x 5s frames. Here’s an image. It does seem bright! Midpoint 21/11/2017 2015 UT.
Yes, congrats Robin. The galaxy is nicely positioned, so – weather permitting – I’ll try and get some images over the next week for magnitude estimations. David
Thanks Nick. The software looks really useful. I noted there was a long smudge just below as well, so it does make one a bit doubtful! I’ll try to get multiple stacks as you suggest, and then blink them. David
Certainly not a striking image, but I might just have picked up Heinze above the sky background. Please see the FITS here
https://1drv.ms/u/s!Agvxu8wNOxpAcJ2l_8CiGRTPXrc
and give me your opinion. The midpoint of the capture was 050649 UT on 8 Nov 2017.
Quite. Perhaps, Robin, you should reveal to Eric Watkins where in the UK this astro-friendly micro-climate exists. David
Thanks for flagging this Robin. I can’t do spec, but I do have B, G and R CCD filters – so if the object is bright enough for my setup, I’ll take a set of images. David
Hello everyone. I would like to second Martin Lewis’ question / request for this functionality. If it isn’t too much trouble – I don’t know what would be required ‘under the hood’ of the website. David
Image now visible via Rochester SNimages site. Carried out photometry and checked it – magnitude came out brighter than I judged by eye, at 13.6. Would be good to image this target again. Perhaps Thu. David
I’d be happy to submit my image and magnitude estimation (CCD, clear filter). I gather you have to go through VSnet to get your obs on the Rochester site, so I’ve sent a request to be added to the system. I’ve set a median stacking job going on my laptop during my lunchbreak – I can then use the Aperture Photometry Tool on that image to get a more accurate determination of the SN magnitude, using a couple of comparison stars.
I follow your spectroscopy with interest, Robin. I’ve just imaged the SN – the stacked image is on my observing page. Very bright – guesstimate mag 14, when compared with Gaia 1564852608241033472. The SN is clearly visible on individual frames; I will keep lights and darks in case anyone wants them for photometry. Best wishes – David
