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While Jennifer Heitz was jogging at 6 a.m. Friday, her focus quickly shifted from the path in front of her to an object way above.Watch report: Northern California wonder about mysterious light in sky“It was very bright -- like maybe a spotlight like you would see a helicopter up in the sky,” the Roseville resident told KCRA 3.Other KCRA 3 viewers also reported seeing an object move across the sky Friday morning.Watch report: Dirk goes over possible explanations for object in skyThe object, described as a bright light with a tail-like object trailing behind it, was spotted by people in the Sacramento region, Lake Tahoe, Stockton, Reno and the Bay Area.Photos: Object over Northern California skyHeitz said there appeared to be smoke or "spray" coming from the object and it was gone in about 30 seconds.“It was moving and then it just vanished,” she said.Theories on what the object might be ranged from a comet to the arrival of the Transformers on KCRA's Facebook page.“There’s no comet (that is) supposed to be that bright,” said amateur astronomer Charlie Coburn.Coburn spent Friday at Community Observatory in Placerville trying to gather more information about the object.The observatory recently set up a camera to record the sky throughout the night.But he said that for some unknown reason, the conservatory's camera stopped recording at 3:30 a.m. -- about two and half hours before the sighting.KCRA 3 meteorologist Dirk Verdoorn said it is not uncommon for meteors to dash across the sky, but added that the pattern of the object seen Friday is not consistent with a meteor or comet.A spokesman at Vandenberg Air Force Base said the object did not come from the air base.So for now, the mystery remains.See photos of the object from u local users.KCRA's Brian Heap contributed to this report.