(12929) 1999 TZ1 : A Portait Of The Closest Centaur

Details (12929) 1999 TZ1 : A Portait Of The Closest Centaur (12929) 1999 TZ1 : A Portait Of The Closest Centaur

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.5206m&link_type=abstract

American Astronomical Society, DPS meeting #39, #52.06; Bulletin of the American Astronomical Society, Vol. 39, p.517

Astronomy and Astrophysics

Astronomy

Scientific paper

Small body (12929) 1999 TZ1, which is located on a typical Jupiter
Trojan orbit at a=5.21 UA, is classified as a Centaur due to its short dynamical lifetime. It is hence the closest and one of the brightest members of this population.
We report on millimetric flux measurements, as well as visible photometry and visible-near infrared spectroscopy performed on February-May 2007 on this object.
The light-curve obtained at the Calar Alto 1m telescope, Spain, reveals a short rotating double-peaked period of 10.438 hours, with a low 0.1 magnitude peak-to-peak amplitude.
Millimetric flux obtained with the IRAM-30m antenna facility at Pico Veleta, Spain, using MAMBO bolometer, was of 1.4 +/- 0.3 mJy. This flux and the visual magnitude (app. V=16.4) were interpreted through a standard fast rotator thermal model, which estimates the objet diameter of 50 km.
Geometrical albedo is also determined at p 0.085, much higher than the typical Trojan albedo (0.04), but fully consistent with Centaurs albedo distribution.
In addition, we obtained the reflectance spectrum of 1999 TZ1 at the Nasa Infrared Telescope Facility (IRTF) located at the summit of Mauna Kea, Hawai`i using the SPEX instrument. The 0.7-2.5 µm spectrum shows a reddish slope with no obvious spectral features, which is quite comparable with the spectra of Jupiter Trojans or D-type asteroids.
Further interpretation in terms of shape determination and thermal modeling will be presented.

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