Just sitting back and watching you enjoy the ride. Congrats on the APOD.
Yes,Jenette-Its and interesting ride!!
A bit like the internet version of riding a Brahmin bull in a bush fire,lots of action,and a few clowns on the side line (naysayers).but all good.
Thanks Paul,Dennis,Humayan and all other IIS members who have recently commented.Its been am interesting and educational experience.
BTW,I have come to an arrangement with a U.K publishing firm,who are doing a story on the whole image-how I got it,what I did,preparation etc,etc.
The story will end up in many various publications in Europe.The Italian internet news story,appears to be just taken from the IIS thread-without permission from me to publish photo.The U.K chaps will handle all that sort of thing now.
Unfortunately my dealings with QANTAS have been unfavourable,so off-shore was the only way to go.The image is also been used in Bren Planetarium,
Germany-I gave my permission for that.They will send over documents of how the images is used etc,so I could post it,if people feel it could be of interest
Cheers Chris
Last edited by hotspur; 01-10-2010 at 02:54 PM.
Reason: detail
I was just playing around with the objects and data elements in order to do some calculations and came up with this diagram to help me plug the values into the various equations!
Cheers
Dennis
Last edited by Dennis; 01-10-2010 at 07:02 PM.
Reason: Chart updated with Ground Distance indicator.
I am sorry man, but something isn't quite convincing here..
I don't do any maths and I am not a professional photographer and
from the pictures of the set you published, I think the image you posted there has been photoshopped. great trick man! arrived all the way to Brisbane...
I am sorry man, but something isn't quite convincing here..
I don't do any maths but I am a professional photographer and
from the pictures of the set you published, the moon is so small and faraway, that for the plane to be in the position it is, it should have been almost landing on his surface in order to have those proportions...
great trick man! arrived all the way to italy...
You obviously didnt look at the first 5 photos that Chris posted on this thread it shows the pic clearly on his camera while hooked up to scope
[QUOTE=Jen;640918] You obviously didnt look at the first 5 photos that Chris posted on this thread it shows the pic clearly on his camera while hooked up to scope [/QU
Okay Mike, here’s how I did it, although I am open to review and any corrections for the procedure and maths, as it has been such a loooong time since I did this stuff at school!
Using Photoshop CS5 I measured the diameter of the Moon and the length of the airplane fuselage and came up with the following:
PART A: Relative angular size of Moon/Airplane.
Moon Diameter = 1370 pixels
Body Length = 760 pixels
Therefore Body Length/Moon Dia ratio = 0.5547. If the Moon subtends an angle of 30.3 arcmins, then the Airplane Body subtends an angle of 0.5547 x 30.3 arcmin = 16.8 arcmin.
16.8 arcmin / 60 = 0.28 degrees.
PART B: Line of sight distance from Chris.
As a good approximation, 107.75 feet / Tan 0.28 degrees should give the distance of the airplane from Chris; that is, some 21,500 feet which is approx 6568 metres.
As we know the altitude of the Moon above the horizon (ignoring Chris’ height above sea level) and have just calculated the line-of-sight distance from Chris, we can calculate the ground distance using Cosines.
PART C: Ground distance from Chris.
That is, Cosine 73°46’ x 6568m = 1.840 kms approx, giving the ground distance some 1.84kms from Chris’ observatory.
PART D: Height above ground of aircraft.
The height of the aircraft above the ground can be obtained using Sines as follows:
Sin 73° 46’ x 6568 m = 6306m approx. (ignoring Chris' elevation)
LUNAR LIBRATION CHECK:
As amateur astronomers, we are aware of the effects of Lunar Libration; attached is a Lunar Map Pro screen capture of the Moon as simulated for Blackbutt at 5:24pm on 16th Sept 2010.
Well, that was a pleasant stroll down memory lane - please feel to correct any bad assumptions and poor memory recall!
Cheers
Dennis
Last edited by Dennis; 02-10-2010 at 02:56 PM.
Reason: Fixed typo
Thanks Marc-How does this work? I mean I did not give permission for them to use image-and what's a 'geekologie'
I have a given permission for a U.K publishing company to manage image.I will send them this link. that Marc has given us.
It appears the image Marc found has been taken off APOD.
If any others pop up let me know-I will let my agent know and they can deal with it (woha-sounding a bit 'un-Chris-like') I mean "let my agent know"-(giggles.)
But,I mean I wonder how all this works?with copyright etc.
Anyone else find it kind of ironic that probably 99% of images chosen as APODs have lots, lots more post-processing and photoshopping than Chris' image here, yet his single frame image with minimal processing is being picked apart?
Anyone else find it kind of ironic that probably 99% of images chosen as APODs have lots, lots more post-processing and photoshopping than Chris' image here, yet his single frame image with minimal processing is being picked apart?
What’s really ironic, (and please excuse me here Chris), is that Chris is a novice at Photoshop!
To make a believable composite from a correctly illuminated, scaled and oriented airplane, aligned to a Moon image at the appropriate Libration, would probably require more effort that doing the real thing!
PART B: Line of sight distance from Chris.
As a good approximation, 107.75 feet / Tan 0.28 degrees should give the distance of the airplane from Chris; that is, some 21,500 feet which is approx 6570 metres.
that's only if the plane was perpendicular to the line-of-sight; otherwise you'll just get an upper limit, right?
looks quite close though; one might be able to get an estimate of this angle by comparing the ratio between the wingspan and the fuselage length in the photo to the real ratio, but you'll have to make other assumptions about yaw and pitch here.
The Good people at BOMBADIER from Toronto-Canada (where the Q400 is made)
Have been in touch! they are keen to make big posters of
The "Kangaroo Moon" image!
WOHA! Chris
Last edited by hotspur; 02-10-2010 at 02:11 PM.
Reason: detail
Sensational news Chris ! Congratulations yet again.
Quote:
Originally Posted by hotspur
The Good people at BOMBADIER from Toronto-Canada (where the Q400 is made)
Have been in touch! they are keen to make big posters of
The "Kangaroo Moon" image!
I am sorry man, but something isn't quite convincing here.. I don't do any maths <snip>
</snip>
great trick man! arrived all the way to italy...
I wonder if Avatorotava thinks Thierry Legault was floating around in space when he took his photos of the Shuttle transiting the sun... probably thinks the shuttle is so small at 600km that no one could be able to image it and hey.... imaged in less than a second of transition time.
I assume he meant the image and article and not the plane...