Spiral light in the sky identified as Falcon 9 rocket by Sydney Observatory astronomers on Saturday 5 June 2010

Spiral light in the sky identified as Falcon 9 rocket by Sydney Observatory astronomers on Saturday 5 June 2010

Published by Nick Lomb on June 8, 2010 2 Comments

Video of the Falcon 9 rocket over Sydney, courtesy John Stevens

There was great excitement in Sydney and other places on the east coast of Australia on the morning of Saturday 5 June 2010. Early risers reported seeing a bright spiral slowly moving across the sky from west to east. People reported their sightings to media outlets, emergency services and a good number appropriately reported it on the Sydney Observatory blog Lights in the Sky page.

No one seemed to know what it was. The usual suspects mentioned in the media suggested that it was a UFO or even visitors from space. The best suggestion seemed to be that it is a stunt associated with the next day’s arrival of teenage sailor Jessica Watson on the Sunshine Coast. Even astronomers were quoted in the media with various random suggestions such that people had been looking at the planet Jupiter or that it was space junk. However, the mystery was quickly solved by Sydney Observatory astronomers Dr Andrew Jacob and Geoff Wyatt who identified the object as the newly launched Falcon 9 spacecraft on its first pass after launch. Their comments were widely reported in the Australian media.

Circumstances were perfect for the visibility of the spacecraft over eastern Australia. The craft had been launched at 4:45 am AEST from Cape Canaveral and had reached orbit within nine minutes. An hour later after travelling across a large part of the globe from west to east (the same direction that the Earth turns on its axis) it reached the east coast just before nautical twilight that occurred in Sydney at 5:55 am. The timing meant that the rocket, circling about 250 km above the ground, was illuminated by the Sun while the sky was still dark.

As explained by Andrew Jacob in a comment on the Lights in the Sky page and, in greater detail by Phil Plait on his Bad Astronomy blog, the second stage booster of the Falcon 9 rocket was spinning and as it released vapour the spin created a water-sprinkler effect.

For those who were lucky enough to see it, the Spiral in the Sky must have been an awe-inspiring sight. And for the astronomers, Andrew Jacob says that, “It made a standard Saturday quite something!”.

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2 Responses to “Spiral light in the sky identified as Falcon 9 rocket by Sydney Observatory astronomers on Saturday 5 June 2010”

  1. June 22, 2011 at 8:08 pm, Goodgrenade said:

    ok, heres somthing funny. I looked up the spiral over the arctic circle in norway, wich they claimed it to be a failed russian missle(sighs), so i say to myself, “what about the spiral over sydney, lol i bet that was an austrailian rocket right?(laughs to self)” so i look it up and to my COMPLETE AMAZMENT, they do in fact claim it to be just that! Need i say more??

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  2. December 29, 2010 at 11:48 am, Nicolle said:

    Who are you trying to fool and why?
    Why are you so intent on covering up these phenomena with some ridiculous story about Falcon 9. Seems there must be a lot of Falcon 9′s launches in many parts of the world setting of spirals of light for everyone to see.
    Why dont you stop trying to pull the wool over the publics’ eyes and admit the truth or at least admit ignorance on the subject. Your time is up, dont you know. The forces of light and Truth are now coming in to this planet, and you shall deceive no longer

    Reply