Starship Asterisk*

c3dr1c wrote:Hello everyone.

I create this topic to try to solve one mysterious. I took pictures from a mysterious light at 10 January 2015 and i don't know what it is... Initialy when i saw the light, i was very happy because i think i photographed one supernova or something related. But when i analysed the images i percepted that the object don't move as the apparent motion of the sky. This light was visible more less 45min in the sky. In the moment i didn't percept any motion but there are a little rectilineious motion.

I search and i found that in this day, the Spacex Falcon 9 CRS-5 was launch. Can be a picture of something related with that?
This picture was taken in portugal, at 21h00.

What do you think about that?

c3dr1c wrote:Thank you for your answer...

But I have a doubt related with the time of the launch and the time of my observations. Because the time of the launch was 9h00 and my observations was 21h.

geckzilla wrote:Was it directly above you?

geckzilla wrote:As usual, Les Cowley and his highly informative website has a pertinent example:
http://www.atoptics.co.uk/halo/pilpic22.htm

There must have been a bright light fairly close to Cédric during the event. The ice crystal layer may also have been relatively thin, contributing to the shortness of the pillars.

geckzilla wrote:Sure, and the ground level temperatures may have been significantly warmer than the air above.

https://www.ing.iac.es/PR/newsletter/news2/first.html wrote:

[b][color=#0000FF]A laser, tuned exactly to the D2 transition of sodium, can be used to excite the sodium layer at 90km altitude. The beacon thus created can be used as the guide star for an adaptive optics system[/color][/b]

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First Sodium Laser Beacon at La Palma
No. 2, March 2000

<<As with any adaptive optics system, NAOMI will rely on measuring light from a relatively bright reference object, or "guide star", close to the desired target in order to make the necessary correction. At visible wavelengths, however, it is often not possible to find a sufficiently bright star in the neighbourhood of the astronomical region of interest. One would like to be able to simply dial-up a guide star exactly where it is needed, and this is possible with the use of a "sodium laser beacon". At an altitude of 90km, well above the troublesome turbulence (which rarely reaches beyond 25 km altitude), is a 15 km thick layer of sodium atoms which, just as in a sodium lamp, can be excited to spontaneously emit light. To achieve this from the ground we can use a laser tuned to an absorption wavelength (589.0 nm) of the sodium atoms. The excited region of atoms creates a bright spot in the sky, the sodium laser beacon, which can be used as the guide star for an adaptive optics system.>>