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J/A+A/338/340     Asteroids as IR Standards for ISOPHOT   (Mueller+ 1998)

Asteroids as far-infrared photometric standards for ISOPHOT Mueller T.G., Lagerros J.S.V. <Astron. Astrophys. 338, 340 (1998)> =1998A&A...338..340M (SIMBAD/NED BibCode)
ADC_Keywords: Minor planets ; Polarization ; Spectra, infrared Keywords: minor planets, asteroids - radiation mechanisms: thermal - infrared: solar system Abstract: Asteroids are used as far-IR calibrators for the imaging photopolarimeter ISOPHOT on board the Infrared Space Observatory ISO. For the 10 selected objects we compiled a large uniform database of 678 individual observations, ranging from 7-2000µm. Applying a new thermophysical model to the observations we derived thermal properties of the selected asteroids, based on spin-vector solutions, direct size measurements and the HG-magnitude system. Our investigations indicate very rough surfaces, reflected in the beaming effect, and very low levels of heat conduction, expressed in thermal inertias between 5 and 25J/m2/s0.5/K. Due to scattering processes in the porous regolith, the emissivity varies significantly with wavelength. In case of Vesta we find emissivities as low as 0.6 in the far-IR/submillimetre region. By entering the combined results into the thermophysical model we defined new photometric standards for the far-IR. The absolute accuracy for thermal flux or lightcurve predictions is 5-10% for the first category objects and 10-20% for the secondaries. The methods and procedures discussed here are included in the first update of the ISOPHOT calibration in 1998. Description: Thermal emission observations of 10 selected asteroids. Mid- and far-IR data compiled from a number of sources into uniform database. The table consists of 678 individual observations, ranging from 7 to 2000 microns. Inband fluxes have been converted to monochromatic flux densities. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table7.dat 61 678 Thermal emission observations of 10 selected asteroids
See also: II/190 : IRAS Minor Planet Survey (IMPS) (Tedesco 1992) http://cadcwww.dao.nrc.ca/jcmt : The JCMT archive Byte-by-byte Description of file: table7.dat
Bytes Format Units Label Explanations
1- 4 I4 --- Asteroid [1/532] Asteroid number. See Note (1) 6- 19 F14.6 d JD Julian Date 21- 27 F7.2 um lambda [7.7,2000] Wavelength 29- 37 F9.4 Jy flux Monochromatic flux 39- 46 F8.4 Jy e_flux Flux error 48- 61 A14 --- Inst Telescope and instrument. See Note (2)
Note (1): The IAU designation (number and name) 1 Ceres 2 Pallas 3 Juno 4 Vesta 10 Hygiea 54 Alexandra 65 Cybele 106 Dione 313 Chaldaea 532 Herculina Note (2): Telescope and instrument: HHT: Heinrich-Hertz-Telescope IRAS: Infrared Astronomical Satellite IRTF: Infrared Telescope Facility ISO/ISOPHOT: Infrared Space Observatory / Imaging-Photopolarimeter JCMT/UKT14: James Clerk Maxwell Telescope / United Kingdom Telescope, Cryostat No. 14-Bolometer UKIRT/MAX: United Kingdom Infrared Telescope / Mid-Infrared Array eXpandable-Camera
Acknowledgements: Johan Lagerros References: Altenhoff W.J., Baars J.W.M., Schrami J.B. et al. 1996A&A...309..953A Lebofsky L.A., Sykes M.V., Tedesco E.F. et al., 1986Icar...68..239L Mueller, T., 1997, Ph.D. thesis, Ruprecht-Karls-Universitat, Heidelberg
(End) Johan Lagerros [Uppsala Astronomical Observatory] 08-Sep-1998
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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