Forum Replies Created
-
Posts
-
Robin,
I am looking to guide on fainter stars and more sensitivity.
The lodestar is getting on, and I think there are better cameras for this purpose, correct ?
The main camera is a atik 460.
What about CMOS cameras would they work better than CCD for Spectroscopy ?
Regards,
Jack
Essex UK
Andrew,
Thanks for your reply.
Just as I thought.
LHIRES is not designed to work with fibre optic cables, otherwise others such as yourself would have done it.
Regards,
Jack
Essex UK
Andrew,
Thanks for your input.
I never knew the h alpha line has 7 components.
Also a good point about the development of the quantum theory of light. No one person invents anything. In another example, Edison alone did not invent the light bulb, he needed Franklin’s work on electricity nearly 200 years before him.
Regards,
Jack
Essex UK
Jeremy,
The Analysis of Starlight by Hearnshaw p.59 2 paragraphs on Frank McLean.
But no picture, however the book gives some background information.
Regards,
Jack
Essex UK
Robin, Thomas and Andrew,
Thank you for your answers, its become much clearer what’s going on and why.
Regards,
Jack
Essex UK
Alun and Robin,
Thank you for your advices.
I have not had a clear night to re test !
I don’t think that cross treading is an issue, the tension on the belt is not much at all, so far not a problem. BUT you never know, when I had the collimator lens housing out, I could see no evidence of cross threading.
Robin 2 questions;
1. I removed one fibre washer in the collimating lens housing – as you stated in a previous post – but the lens was loose in the housing, I put the fibre washer back. So, how did you overcome the loose fitting of the lens inside the housing without replacing the fibre washer ? Perhaps your Lhires is different to mine ?
2. I do not recall seeing this double calibration line until I motorised the Lhires !
So, if the double line is real, can it be used as a valid calibration line ?
I will be at the AAVSO meeting.
Regards,
Jack
Essex UK
Alun and Robin,
That’s because I adjusted the micrometer hence the shift in wavelength.
I will repeat this without touching the micrometer an post pics.
I spent Sunday morning fiddling with it adjusting the collimator lens screws but the double line is still there.
When I took the belt off and went back 30 min later it had reverted to a single line !
Thanks for your inputs,
Jack
Essex UK
Bill,
Spectra of these objects are difficult to capture, but interesting to see what they contain.
Good work.
Regards,
Jack
Essex UK
Unfortunately the nova appears to be too low down from my location !
Also, the SkyX doesn’t recognise the name V392 Per or its JO or SON designations. I typed in the RA and DEC coordinates instead, it seemed to track there, but was not visible through the finder scope !
Well done to everybody who got data.
Regards,
Jack
Essex UK
Alun,
I have checked the collimator mounting screws all good, but the double line is still present.
I will adjust the collimator lens screws as tight as possible, so that it just rotates and see if that cures it.
Regards,
Jack
Essex UK
Alun,
Attached last nights calibration frames taken around H alpha line.
Far right double line with belt on, collimator screws loose to allow belt to rotate lens, same far right single line with belt off, collimator screws tightened and focused.
Any thoughts as to why only 1 calibration line is double and what’s causing this ?
Regards,
Jack
Essex UK
Alun,
The belt is fairly taught to turn the collimator with a Velcro layer wrap around for grip.
The white screws are slackened off 1/2 turn or so from tight to prevent side movement.
The belt is not joined.
I have adjusted both again and will see how it works tonight, and will report back.
Regards,
Jack
Essex UK
Lee,
It does to some extent.
I contacted Essex County Council about turning off the lights from 12 instead of 1 to 5 am stating that it would save them money.
I got a reply from a ‘Customer Services Officer’ with a link to the lighting section and council policy which seems to be set in stone !
Jeremy, there is also the issue of the impact of white LEDs on nocturnal animals !
They just don’t get it !!
Regards,
Jack
Essex UK
Lee,
Not sure if this company will have what you want but worth an inquiry;
Regards,
Jack
Essex UK
Alun,
That’s a neat mod with the smaller motor.
Attached is a pic of my finished mod with the Skywatcher motor.
I tried it out on Sunday night and got double calibration lines l l (don’t have a pic) when I took the drive belt off and focused manually it settled down to give single calibration lines l .
What’s causing this to happen ?
Regards,
Jack
Essex UK
Alun,
The collimating lens worked loose in my Lhires but is easy to fix.
I advise Lhires users to check just in case.
Regards,
Jack,
Essex UK
Thank you all for your input, lots to consider here.
Almost finished motorising the collimating lens, I wrapped a 3 mm wide strip of Velcro round the edge of the lens which grips the belt and works best at fastest rotation speed setting on the handset.
I will test the system and make any changes as necessary as per your suggestions.
Once complete, this should be a more user friendly set up and relatively cheap to convert.
Regards,
Jack
Essex UK
