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Topic: 308 Polyxo

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	4 Laboratory spectra and observational results (Site not responding. Last check: 2007-10-29)
		Although this is just a tentative interpretation of the obtained ISO mid-infrared spectrum of Frigga, the silicated iron nature of the meteorite Winona seems to be in agreement with the debated classification of this asteroid.
		Asteroids 114 Kassandra and 308 Polyxo have been classified as belonging to the T class by Tholen (1989), as a D2-type object by Barucci et al.
		This result is surprising since Ornans is a type 3 carbonaceous meteorite chondrite (CO3) which seems to show the presence of aqueous alteration processes (Zolensky and McSween 1988).
	www.edpsciences.org /articles/aa/abs/2002/39/aah3638/node4.html (1152 words)

	TAGISH LAKE PHOTO (Site not responding. Last check: 2007-10-29)
		One asteroid in particular, 308 Polyxo, exhibits almost identical visible and near-infrared reflectance spectra to that of Tagish Lake, and also has a distinct 3-micrometer absorption band like that in Tagish Lake (and in WIS 91600), indicative of the presence of hydrated minerals (T. Hiroi and S. Hasegawa, 2003).
		However, it was shown that there are other D asteroids besides 308 Polyxo which are located closer to one of the Kirkwood Gaps, from which a transfer to Earth's orbit could be executed.
		Also noteworthy is the finding that 773 Irmintraud, 308 Polyxo, and the C-class asteroid 511 Davida all contain hydrated materials as contained in Tagish Lake.
	www.geocities.com /CapeCanaveral/9278/protected_TAGISH.HTM (2272 words)

	RASNZ Occultation Section - Polyxo Occultation Update
		OCCULTATION BY (308) POLYXO - 2003 AUG 26
		On 2003 Aug 26 UT, the 140 km diameter asteroid (308) Polyxo will occult an 11.4 mag star in the constellation Orion for observers along a path across Australia.
		In the case of an occultation, the combined light of the asteroid and the star will drop by 2.3 mag to 13.6 mag (the magnitude of the asteroid) for at most 4.8 seconds.
	occsec.wellington.net.nz /planet/2003/updates/030826u.htm (606 words)

	SWUIS-A 308 Polyxo Mission
		Alan Stern, the project's Principal Investigator, "This observation will reveal the size of the asteroid, 308 Polyxo, which (like most asteroids) is too small for even the Hubble Space Telescope to resolve." Dr.
		Click here to see an mpeg animation (1612K) of the 308 Polyxo occultation reconstructed from SWUIS-A flight data.
		If you look carefully at the image taken during the event itself, when the star has been occulted by Polyxo, you may note the faint image of the asteroid itself, at magnitude 12.7.
	www.boulder.swri.edu /swuis/polyxo.html (652 words)

	RASNZ Occultation Section - Polyxo Occultation Update
		OCCULTATION BY (308) POLYXO - 2004 APR 12
		On 2004 Apr 12 UT, the 140 km diameter asteroid (308) Polyxo will occult a 11.8 mag star in the constellation Gemini for observers along a path across Australia.
		In the case of an occultation, the combined light of the asteroid and the star will drop by 1.9 mag to 13.5 mag (the magnitude of the asteroid) for at most 5.8 seconds.
	occsec.wellington.net.nz /planet/2004/updates/040412_308_2522_u.htm (616 words)

	Publications by Takahiro Hiroi
		Hiroi and S. Hasegawa (2003) Revisiting the search for the parent body of the Tagish Lake meteorite: Case of a T/D asteroid 308 Polyxo.
		Takano (1983) Determination of surface minerals of asteroids by spectral reflectance measurements of meteorites.
		– Case of a T/D asteroid 308 Polyxo.
	www.planetary.brown.edu /~hiroi/Publicat.htm (2822 words)

	Asteroid Page
		An example of how the observations are computed to determine a size and shape of an asteroid is shown in the figure below of the occultation of the Star SAO 118158 by the asteroid 308 Polyxo.
		In the diagram, R. Nolthenius from Aptos, CA had a miss observation near to the northern side of the asteroid while the 4 other observers did have occultations of different durations.
		Thus from the successful observation of this asteroid, IOTA astronomers have estimated the size of the asteroid 308 Polyxo as 154 x 126 kilometers.
	weblore.com /richard/AsteroidPage.htm (2671 words)

	Update for (308) Polyxo - November 15/16, 2004
		IOTA/IOTA-ES occultation update for (308) Polyxo / HIP 57629 = SAO 138420 on November 15/16, 2004 visible from N Portugal, Spain, Mallorca, S Sardinia, N Tunisia, S Sicilia and Malta Summary
		In the night of November 15/16, 2004 a bright 6.2 mag star HIP 57629 = SAO 138420 will be occulted by a 148 km asteroid (308) Polyxo.
		This update is based on USNO/Flagstaff and TMO astrometry for the asteroid and Hipparcos star position.
	mpocc.astro.cz /updates/2004/1116pol.html (345 words)

	[5.01] ISO Observations of Asteroids (Site not responding. Last check: 2007-10-29)
		A thermal model has been applied to these infrared observations to determine the diameter and the albedo.
		Four asteroids (10 Hygiea, 114 Kassandra, 308 Polyxo and 624 Hektor) have been also observed with SWS, and high resolution spectra have been obtained between 5.3 and 45 micron.
		The obtained results and spectral analysis will be presented and discussed.
	www.aas.org /publications/baas/v30n3/dps98/1.htm (193 words)

	Southwest Research Institute 2000 Annual Report, Space Science
		The presence of argon provides a method for measuring the thermal history of comets and, in this case, indicates that the comet likely formed in the deep outer reaches of the solar system - beyond its once-suspected birthplace in the somewhat-warmer Jupiter zone.
		From a NASA F-18 aircraft, SwRI astronomers successfully observed an asteroid, 308 Polyxo, occulting a star.
		The aircraft was outfitted with the Southwest Ultraviolet Imaging System-Aircraft (SWUIS-A), designed and built at the Institute.
	www.bioengineering.swri.org /3pubs/ar2000/space.htm (1417 words)

	Update for (308) Polyxo - January 29/30, 2004
		Update for (308) Polyxo - January 29/30, 2004
		IOTA/IOTA-ES occultation update for (308) Polyxo / HIP 27972 = SAO 94989 on January 29/30, 2004 visible from Iran, E Turkey, Romania, S Moldavia, NE Hungary, SW Ukraine, Slovakia, SW Poland, NE Czechia, N Germany and Scotland Summary
		In the night of January 29/30, 2004 a bright 7.3 mag star HIP 27972 = SAO 94989 will be occulted by a 148 km asteroid (308) Polyxo.
	mpocc.astro.cz /updates/2004/0129pol.html (401 words)

	308 Polyxo: ISO-SWS spectrum up to 26 micron (Site not responding. Last check: 2007-10-29)
		308 Polyxo: ISO-SWS spectrum up to 26 micron
		Infrared spectroscopic observations of the asteroid 308 Polyxo have been carried out by the Infrared Space Observatory (ISO) with the Short Wavelength Spectrometer (SWS) in the spectral region between 7 and 26
		The Standard Thermal Model and the Thermophysical Model have been applied to the obtained data in order to model the thermal continuum.
	www.edpsciences.org /articles/aa/abs/2004/45/aa1638/aa1638.html (234 words)

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