Forum Replies Created
-
Posts
-
Down here in Salisbury, things looked hopeful. There was thin haze being illuminated by a bright Moon. But about 25mins before launch a band of cloud rose in the west – I was looking at a bearing of about 240degs and 4 degs elevation – and after that there were only faint thinnings through which I glimpsed stars. I reviewed the images and didn’t see any star-like source move right to left during those few minutes. So, no ascent to (nearly) orbit imagery from me.
It may have been 1.2C on the hill, but it was fun – I could hear foxes and owls in the distance.
Not sure it is embarrassing. According to an interview on the BEEB, the risk assessment indicated a 27% chance of failure. And, as the saying goes, “sewage happens”.
It literally is rocket science. Its hard and we have become blase.
I will certainly have another go at the next launch.
Using the graph Nick kindly provided of apparent elevation versus range, plus the ground path and flight profile I got some approx values.
If I am viewing the map right, the lat and lon lines are at 2 deg spacing, I get a position for the launcher as 37N 15.5W at T+480s and 32.5N 16.5W at engine cutout.
From Salisbury it looks like 200-300s after launch gives an altitude just under 4 degrees – rubbish, but just doable*from a high location on a good night, if the engine burn is very bright (who knows?). Okay, its a chance in a million.
From Lands End it is better – but still not great – at ~9 degs elevation at ignition +200s. Should be brighter though.
For Tenerife – I know someone out there currently. I get:
T+480s ~5 degs elevation at 160km alt, 970km distant with 0 deg bearing.
T+570s ~16degs elevation at 160km alt, 465km distant with 1 deg bearing.For La Palma – for Paul
T+480 ~5 degs elevation at 160km alt, 950km distant with 13deg bearing.
T+570 ~18degs elevation at 160km alt, 442km distant with 17deg bearing.I think I got that right… but some of the measurements have an element of handwavium.
Thanks again to Nick for the visibility map. I shall hang on to a copy of that.
The article on the Beeb suggests there is a live stream….
https://www.youtube.com/watch?v=5Co18HcyqHk
I will make sure I am ready from 22:30 onward.
Has anyone any feel for how high it would be above the horizon?
Weather looks decidedly iffy here.
Sounds fun to me. Now, we just need a launch time…. 2 hours is a long time to just hang about. Suddenly a meteor camera looks very useful.
Oh, I think I missed something there….
You have to ask them to give you a copy of your data as FITS? Theres no SD card or something where all your session data is saved that is accessible to you? Does this mean you don’t have anything else other than a jpg/png they serve up to you live? I’m surprised at what you said but, clearly, they have found a market.
Just to be clear, as I have never used one, what is the bit depth on the png provided? I think that both 8 and 16 bit are legal png formats, though some software doesn’t like 16 bit pngs or TIFFs.
If the png is 8 bit (or even 3x 8bit) then they have rather constrained you to the Citizen Science route, as that makes it harder to do any on your own. But, I don’t know the png file format well enough to judge if its metadata content could be used to populate a FITS header.
The hint is in the name. The vast majority of deep sky images are exactly that, pretty pictures. Theres no scientific rationale for taking them and no need for the person doing so to worry about gamma stretching or sharpening – its about showing the structures and elegance in an object in a tasteful and appealing way. Look at how many people return to an object (such as M42 or M16) every few years because improved skills, location or instrument mean they will be able to pick out more detail or create an image more eye catching. The target itself has not changed. It is a quest to get the maximum performance from the kit you can afford: we all know that if we had a PlaneWave 24″ in Chile, an Andor camera and unlimited time on it we could take better pictures, but most of us cannot afford one, so we strive to do the best we can.
With planets its also about detecting features (dust storm, cloud feature, polar cap) but, they change which makes life much more interesting.
Its the change aspect that makes variable stars, the Sun, aurora, meteors and comets interesting too. Its why I spend most my nights chasing variable nebulae.
I have seen people post pics in the BAA Gallery that were clearly composites and they have not mentioned it. That I must admit to disliking.
Yeah, I read some of the AAVSO pages on this. Sounds like they are not in a hurry to provide FITS files – which is kind of weird given how its a trivial bit of coding. A doddle in C and trivial in Python.
Sounded like the way the Citizen Science is done is taking observations and sending them to someone else who does the data reduction… Sounds a bit dull to me. Data reduction is what cloudy nights are for.
Some mention of the code being open sources and then of release of an API, but nothing yet – and promises are cheap of course.
Thanks for the headsup. Your observation really does suggest we all need to keep a close eye on it in the months ahead.
Hi David,
I think that V shape and the right hand wing (on your image) feature have been faintly visible on some unfiltered images since the summer.
Such as here:
https://britastro.org/observations/observation.php?id=20221129_230438_ac6a218c4ac94ed0
and
https://britastro.org/observations/observation.php?id=20221129_230930_656c96e63f3df518Was it absent in your similarly exposed Rc filtered images from earlier in the year? The nebula is heavily reddened, so you might well see changes before those of us working unfiltered noticed them.
Do you still measure the nebulosity brightness at all? What does that curve say?
Would be nice for this or McNeil’s to reappear at last. Looked at Thomme’s last night and can’t see much change since I started looking at it and McNeil’s is absent with V1647 Orionis in the 19.5-20.5 mag range when skies are clear enough to detect it.
Happy Solstice!
Grant
From Wiltshire, at 0630 the Sun is about 8.3 degrees below the horizon. TheSkyX still shows 1st and 2nd mag stars visible at that time, but I don’t know how accurate that is.
I think this guarantees cloudy nights for a week…
You probably need to add dancers, a 120bpm backing track, some dry ice, lasers, a conspiracy theory and someone being humiliated to keep social media fans tuned in.
Seems to be working. Looks like thin cloud presently.
There are a couple of small dust patches – as you said – but nothing thats going to detract from a good chunk of the Sun being obscured…
It was fun to watch and some of those observing from the ground did quite well too…
https://twitter.com/fallingstarIfA/status/1574583529731670021?s=20&t=bSNlZJgGJmZCFPEEcFqEvA
3 tonnes of TNT appears to have made a pretty impressive cloud of debris.
