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Today after the midnight I recorded the spectrum of C/2020 F3 (Neowise). I couldn't change new diffraction grating (300 l/mm) before the midnight in my Low Spec 2 spectrograph. I have printed second unmodified mounting for grating and I had to use it, because dispersion angles are different than the 1800 l/mm diffraction grating. It was also necessary to assemble and run the setup. Not all lines were identified, the spectrum is different than spectra published on the internet. The violet range is worse due to the poor correction of chromatic aberration in achromatic lenses in my Low Spec and my APO, so lines are weaker. Intensity hasn't been corrected. I think that this comet was too low above the horizon to do it well. This is also the first light with a diffraction grating 300 l/mm used in the Low Spec 2.
Slit position, PHD2 screen:
Spectrum with stretched histogram, faint LP of my city is present in the background, 5x60s stack:
I hope that I correctly substracted LP from the comet spectrum.
The result obtained in the BASS software:
We have carbon C2 bands, CN and strong emission of sodium doublet. Some lines are unidentified yet.
Sky-Watcher HEQ5 PRO Go-To Astronomy Mount
With all accessories - as new February 2020
HEQ5 Mount Head
1.75" Stainless Steel Tripod
2x 5kg Counterweights
SynScan Handset & Cable
12v Cigarette DC Power Cable
Vixen-Style Medium Dovetail Bar
Price £690 - buyer collects Hampshire
By Tenor Viol
I am currently waiting for a nice shiny 100mm refractor to arrive... to put on my new HEQ5 PRO.
Meanwhile, lurking in the garage in a case that hasn't been opened in over 20 years is a 40 years old this year Celestron C8 - the original fork mounted type in orange.... I'm suspecting that in order to get say a long dovetail plate to fit to it will require some modifications? At 2,000mm f/10 it will be good for lunar and Jupiter and Saturn.
Has anyone any experience of doing this with the old style C8? It's fair to say I either lack the requisite skills or equipment to do anything more complex than screw/bolt things together, is if it is more than that, suggestions as to who could carry out any necessary modifications would be welcome. I realise DEC balance will be an issue on a GEM with an SCT...
(In case you're wondering... back in 1980 when I bought it, there were no such things as dew straps, or much of anything else and I just found it not easy to use, eyepieces were ferociously expensive and I was a lowly bank clerk at the time, then I bought a house....).
Hi All, wondered if you could help me make sense of this ... new HEQ5 - belt modded by FLO, all feels good, minuscule backlash but strange guiding.
Admittedly first time using it but baffled.
Failed calibration see image below and guiding seemed to be Ra and Dec following each other.
Stars look ok ish (@ 1500 mm )
Needle galaxy is poor as only about 10 mins each in RGB
note - it was hazy and did keep losing star in OAG
Thanks for looking