Startrails - Barragem de Santa Clara

Not selected for Google Earth or Google Maps after a second review [?]

100 frames taken 18-08-2012 00:36 to 01:26 (30s, f3.5, ISO 500, WB cloudy) orientation to the North (Polaris at the center) stacked with Startrails. If stacked with DeepSkyStacker the output shows much more stars but the image is noisy…
During those 50 minutes I noticed two events, both in individual frames:
Event 1 probably a shooting star, Event 2 shooting star aligned with the camera axis or ???

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Comments (2)

Roger Powell on December 12, 2013

A great image. Well focused and clearly indicating the different colour classifications of the stars. The small offset of Polaris is also noticable.
Event 1: I agree is a meteor, not a satellite.
Event 2: is interesting. I assume it only appeared on one of the hundred frames? Have you examined that frame? It is clearly of very short duration. Your suggestion is possible. It may also have been a meteor which appeared in the last moment of one frame but had passed by before the next frame commenced. It could have been a brief moment that an aeroplane or helicopter headlight pointed towards the camera, or a brief reflection from a satellite. Alternatively it may have been an artifact of the camera such as electronic pixel noise; or it may simply have appeared during the stacking process.
: )

Avulso on December 12, 2013

Hi Roger,
Thanks for your long comment.
I did two more series of 100 frames, just after this one, and they were uneventful - boring! What is captivating is the unforeseeable...
Jean-Marie

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Photo details

  • Uploaded on August 19, 2012
  • Attribution-Noncommercial-No Derivative Works
    by Avulso
    • Taken on 2012/08/18 09:22:23

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