Ex Oriente, astrum ---------------------- From the day you are born 'til you ride in a hearse, There's nothing so bad that it couldn't be worse!
8" Criterion Dynamax 6" Homebuilt F/10 Newt 6" F/8 Jaegers 127mm F/5.5 SS Assembly Various 60 mm scopes in many states of repair 8' Dome Observitory
Quote:I do not believe the trail is bright enough to be a meteor, I would guess it is either a spin stabilized satellite or possibly a rotating piece of space junk...Given my choice of the two, I would say it is most likely a spin stabilized satellite which are quite common...
Quote:I'm going to say vibration from some where, The oscillation looks to be about equal to and the same direction as the elongation in your stars.
Quote: do not believe the trail is bright enough to be a meteor
Quote:..... I understand what you're asserting, but I have two objections to that conclusion ....
Quote:) The stars appear elongated in the direction of sidereal movement (as they should for an unguided 10s exposure, of course)...which is / in this particular photo.
The object was also moving in the / direction.
Yet, displacement from that path occurs nearly horizontally, like - Note, in fact, the very distinct "stair step" signature at the lower left end of the trail.
Quote:A vibration would most likely be consistent in amplitude
Quote:If it's vibration, it is very high frequency, but very low amplitude. Given the rate that a meteor (or any other object I'm likely to have caught here) is going to me moving, there's quite a few oscillations there in a short period of time...high frequency.
Quote:Actually what is being observed fits perfectly with a sporadic damped oscillation caused by "stiction" in the gear train (needs cleaniung and relubrication).
Its interesting that the Jimmy Westlake image has been attributed that way as the image could also be interpreted as caused by stiction - the elongated star signature is also present and the amplitude of the star elongation is very very close to the component amplitude in the meteor trail. There is no information supplied by APOD that this possibility was eliminated - for example by two different observers of the same object using different equipment. Jury is out on that one AFAIC
Quote:When it comes to meteors, I'll accept NASA as an authoritative source.