I apologize for the long post but some people can't wade through 13 pages:
dolph wrote:...In short, in an order of magnitude calculation, it appears that this object is likely in a GTO (geosynchronous transfer orbit). The large size and slow motion make it an ideal candidate for the fuel dump theory...
ExNihilo wrote:I have no doubt the object was in a high orbit and dumping fuel along a geosynchronous transfer orbit. The orbital inclination corresponds well with a Kennedy Space Center Launch, and the perspective from Hawaii corresponds with a viewing geometry along the transfer orbit, with the apparent "slowing" indeed being caused by the change of perspective relative to the direction of the orbit. The transfer orbit was to have an 18.2 degree inclination, which seems to correspond well with the observed track:
http://www.aus-city.com/cgi-bin/ultimat ... 001145;p=0The observed time of the track at Hawaii corresponds well with a fuel dump from the upper stage occurring after the satellite, with its final geostationary boost module attached, separated at 1355 UT. Also, with launch from Cape Kennedy to a parking orbit of 166x5239 KM occurring at 1207 UT, the arrival of the vehicle over Hawaii at the time observed seems to be in good agreement with orbital dynamics. Further, passage of the vehicle through its ascending node (crossing the equator heading ENE) shortly before observation at Hawaii is also quite consistent.
malaclypse wrote:go to the atlas-16 flight path (previously posted) listed here:
http://www.spaceflightnow.com/atlas/av0 ... track.htmlthis satellite was commissioned by a satTV company (Echostar's DISH Network) to send a signal obtainable in all 50 states, so it's path would have placed it in a geosynchronous orbit somewhere near north america. if you connect the dots, so to speak, between separation and the US, the satellite would have passed to the southeast of hawaii. meanwhile, the sun would have been just below the horizon in the east (as it was about 4:15 am local time when the pictures were taken), and because of the inclination of the earth on dec 17th (the southern hemisphere tilted towards the sun at ~22 degrees w/ respect to the equator), the cloud of fuel/gas/whatever would have been in a direct line (on the earth's surface) between the sun and hawaii, in perfect position to reflect the sun's rays back down to the telescopes there...
Hawaiian Starman wrote:*eyewitness*
I live in South Kona on the Big Island. I awoke in the very early AM. The sky was quite clear that AM. As I gazed up towards the zenith, tracking close to Leo was a very large "white blob". Being a frequent star gazer my initial response was "What the f#$# is that"!. I have never seen an object like it before. It's size was approximately twice, maybe a little more, than the Full Moon diameter.
After watching it track very slowly for about 10 minutes, I decided it was worth a look in my telescope. I have a 4" Vernonscope Refractor. Magnification was 20x. The wide field revealed a very soft light - no it was not a weather balloon as others have suggested - with stars visible behind it. Rather than some distinct object it seemed that a light was shining on part of the sky!
Even stranger was what I observed on the southern side of the object. About 3 full moon diameters away was a small dot of pale yellow/white light that looked and tracked like a satellite, however, moved much slower. Don't know about distance above the Earth, however, if it was in the atmosphere, there was no sound of any engine noise (I live in a very quiet area of the Island and any atmospheric sound from an airplane etc. would be audible). Also, there was no observable beam of light coming from the small object.
>From the time I picked up the object until it disappeared into the East about 45 minutes later, it remained "parallel" to the "white blob", never varying its distance or speed. I have observed airplanes across the sky here, and this was not moving like an airplane. This tells me the object's distance from the Earth Surface was significantly higher.
- the "object's" brightness remained consistent during my observation (around 45 minutes). I'd say the magnitude was definitely on the minus side of the scale. Very easy naked eye object. It was not as visually bright as Arctaurus. However, since it covered a significantly larger part of the sky, visual magnitude was difficult to discern. The magnitude of the companion "satellite" or whatever it was, probably would be around 8 or 9 magnitude - definitely not naked eye (sky visibility was very good as the Southern Milky Way was quite vivid.
- there was only 1 small object tracking to the right of the white blob. If there was a second piece to the Centaur rocket, I didn't see it telescopically. ...
jcm4589 wrote:... not that mysterious at all. It's clearly venting fuel from the
discarded Centaur AV-005 stage, which had just launched the AMC-16 comms
satellite. On Dec 17 at 1419 UTC AV-005 was almost due south of Hawaii
at 6000 km over 162W 12N, on Dec 17 at 1439 UTC, AV-005 was 8850 km
above 136W 17N, which would put it about 33 deg off zenith at Haleakala
to the east and slightly south - the angle looks a little wrong, but the
match to the track on the animated gif is close enough that I'm pretty
confident of the identification.
Here at the CfA, the IAU Circulars folks have had
several "comet discoveries" reported to them that turned
out to be Centaur fuel dumps, so this sort of thing is often
pretty bright when the Sun-spacecraft-observer angle is right.
(In the old days, the dumps tended to happen at much
lower altitude and were less likely to be well illuminated,
so this is more a phenom of the past 10 years or so).
The cloud soon spreads out and fades.
regards, Jonathan McDowell, Harvard-Smithsonian Center for Astrophysics.
So again, what we have is:
1) The AMC-16 Atlas V liftoff took place at 12:07 UT on Dec 17th 2004
2) At 1:56 UT (13:56), separation of the spacecraft from the upper stage occurred in a GTO (geosynchronous transfer orbit) over the Soloman Islands (
http://www.spaceflightnow.com/atlas/av0 ... track.html )
3) At 2:19 UT (14:19), a strange object is seen over Hawaii, directly in line with the above ground track if you continue it to the northeast. An eyewitness account states that the object was visible for a long time (~50 minutes) and was somewhat transparent as stars could be seen through the object. Also, another smaller object was seen near the larger one through a telescope. Finally parallax between the two observatories puts the altitude at >1000 km.
So all together you have at least 5 people here (including myself) who have crunched the AMC-16 launch data and determined that the rocket would have been near Hawaii (visible) at around 14:19 and in a GTO. A ground track produced from the mission profile confirms these calculations and places the rocket in the same place at approximately the same time . An eyewitness account of something transparent yet so large it was 2 times the moon's diameter, and parallax information from the two sites confirming that the object was >1000 km in height. So the AMC-16 launch profile that day agrees with respect to time and location with two separate visual observations of the same event.
Even if you temporarily set the above launch information aside, if you take the parallax information (>1000km) coupled with other regular observations it's clear the object was well outside the atmosphere and also very, very large. For example, the International Space Station which is roughly 9,600 square feet in surface area, and is the largest man made object in orbit, appears as no more than a bright "star" (magnitude -2 at it's brightest) when seen from the Earth's surface at an altitude of ~350 km. Something 3 times higher (parallax) and hundreds of times bigger (2 times the moons diameter), yet nearly as bright (Arcturus is magnitude -0.04) and also transparent, could only be a large cloud of gas.
Taking this conclusion as separate and then comparing it with the AMC-16 launch profile, all of the data, observations and common sense point to a Centaur fuel dump as being the answer to what was seen that night.