(meteorobs) Hypervelocity meteors

[meteoreye at comcast.net]

That is correct. AFAIK, this would be the first detection of meteoroids that were uneqivocally not part of the solar system, never mind the galaxy.

Wayne

-------------- Original message -------------- 
From: Francisco Ocaña <albireo3000 at yahoo.es> 

> Hello list, 
> 
> before reading this article I thought that meteors at v>73km/s were 
> uncommon. What do you know/think about this topic? 
> 
> 
> arXiv:0712.1571 
> Date: Mon, 10 Dec 2007 19:11:42 GMT (401kb) 
> 
> Title: Detection of an intergalactic meteor particle with the 6-m telescope 
> Authors: V.L. Afanasiev (1), V.V. Kalenichenko (2), I.D. Karachentsev 
> (1) ((1) 
> Special Astrophysical Observatory Russian Academy of Sciences (2) 
> Astronomical Observatory, Kyiv Taras Shevchenko University) 
> Categories: astro-ph 
> Comments: 9 pages, 6 EPS figures 
> Journal-ref: Astrophysical Bulletin, 2007, v. 62, p. 301-310 
> \\ 
> On July 28, 2006 the 6-m telescope of the Special Astrophysical 
> Observatory 
> of the Russian Academy of Sciences recorded the spectrum of a faint 
> meteor. We 
> confidently identify the lines of FeI and MgI, OI, NI and 
> molecular-nitrogen 
> N_2 bands. The entry velocity of the meteor body into the Earth's 
> atmosphere 
> estimated from radial velocity is equal to 300 km/s. The body was 
> several tens 
> of a millimeter in size, like chondrules in carbon chondrites. The 
> radiant of 
> the meteor trajectory coincides with the sky position of the apex of the 
> motion 
> of the Solar system toward the centroid of the Local Group of galaxies. 
> Observations of faint sporadic meteors with FAVOR TV CCD camera 
> confirmed the 
> radiant at a higher than 96% confidence level. We conclude that this meteor 
> particle is likely to be of extragalactic origin. The following important 
> questions remain open: (1) How metal-rich dust particles came to be in the 
> extragalactic space? (2) Why are the sizes of extragalactic particles 
> larger by 
> two orders of magnitude (and their masses greater by six orders of 
> magnitude) 
> than common interstellar dust grains in our Galaxy? (3) If extragalactic 
> dust 
> surrounds galaxies in the form of dust (or gas-and-dust) aureoles, can such 
> formations now be observed using other observational techniques (IR 
> observations aboard Spitzer satellite, etc.)? (4) If inhomogeneous 
> extragalactic dust medium with the parameters mentioned above actually 
> exists, 
> does it show up in the form of irregularities on the cosmic microwave 
> background (WMAP etc.)? 
> \\ ( http://arxiv.org/abs/0712.1571 , 401kb) 
> 
> 
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