The enigmatic object 2201 Oljato - Is it an asteroid or an evolved comet?

Details The enigmatic object 2201 Oljato - Is it an asteroid or an evolved comet? The enigmatic object 2201 Oljato - Is it an asteroid or an evolved comet?

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.3031m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. E2, p. 3031-3041.

Astronomy and Astrophysics

Astronomy

22

Asteroids, Astronomical Photometry, Astronomical Spectroscopy, Comets, Infrared Astronomy, Radar Echoes, Solar System, Spectral Reflectance, Asteroids, Comets, Oljato, Orbital Elements, Earth-Based Observations, Telescope Methods, Wavelengths, Visible Light, Near-Infrared, Albedo, Spectroscopy, Optical Properties, Reflectance, Photometry, S Asteroids, Radar Methods, Classification, Comet Nuclei, E Asteroids, Taxonomy, Dust, Ultraviolet, Outgassing, Emissions, Oh Radical, Cn Radical, Orbits, Near Earth Aster

Scientific paper

The orbital properties of near-earth object 2201 have been associated with meteor showers, and its modeled orbital evolution is chaotic - a property which might indicate a history related to comets. Telescopic observations of its visible and near-infrared spectral reflectance, broad-band visible and near-infrared photometry, infrared radiometric measurements, and radar echoes are reported here from two apparitions, 1979 and 1983. This asteroid has a high radiometric albedo, a property not associated with comet nuclei. In certain wavelength regimes it is classified as an S-type asteroid, in others, an E-type, but its overall spectral reflectance is not typical of either taxonomic type, and neither type is thought of as cometlike. Unexpectedly high ultraviolet reflectance at the 1979 apparition was suggested to be the result of residual outgassing as in a comet. The UV photometric data are modeled as fluorescent emission from neutral species found in comets. The resulting calculations indicate a plausible value for OH and CN emission at 0.3085 and 0.38 micron relative to the observed range of active comets.

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