This program involves telescopic observations of colorimetry, spectroscopy, and photometry of small bodies of the solar system, emphasizing possible relationships among outer solar system asteroids, comets, and certain satellites. Earth approacher targets of opportunity and lab spectroscopic studies are included

Hartmann, William K.

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N92-12818
Studies of Relationships Among Outer Solar System Small Bodies
and Related Objects
Planetary Science Institute
242I E. 6th Street
Tucson, AZ 85719
William K. Hartmann
Strategy
This program involves telescopic observations of colorimetry, spectroscopy and photometry of
small bodies of the solar system, emphasizing possible relatic)nships among outer solar system
asteroids, comets, and certain satellites. Earth approacher targets of opportunity and lab
spectroscopic studies are included.
Progress attd Accomplishments
The current year of the program is very productive. Our discovery that a band at 2.2 Iam can
be associated with C=N bearing solid organic material in asteroids, comets, the Uranian rings,
and Iapetus, has been announced in 1991 LPSC and 1990 DPS abstracts. We completed an
MKO UH-88 run in March 1990, netting lightcurve data on 7 Troian and Hilda asteroids.
We also completed an IRTF observing run in December 1990 with astrometry on Galileo
target asteroid 951 Gaspra, and new bolometry and/or colorimetry on other asteroids and
comets. We completed a new paper on our discovery that 3 Earth-approaching asteroids
show spectra matching basaltic achondrites and this was published in Icarus in 1991. Three
other papers were published in Icar,s in calendar 1990. Als(_, I am serving on the NASA
Discovery Program Science Working Group on low-cost missk)ns to small bodies, at the
invitation of Wes Huntress and Joe Veverka.
Projected Accomplishments
We have several papers in progress. We have submitted a paper ()n the first identificati¢)n (_f
solid C-N bearing organic materials on outer solar system be)dies. We are preparing a
laboratory study of spectra of organic asteroid-candidate materials and an()ther paper ¢)n
Trojan lightcurves. We anticipate at least one Mauna Kea ¢)bserving run in 1991 t() study
outer solar system b_)dies, especially 2061 Chiton.
Publications
Cruikshank, Tholen, Hartmann, Bell, and Brown (19t_)l). Three Earth-Approaching Asteroids
and the Source of the Basaltic Meteorites, hartts, 89, 1-13.
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Hartmannand Tholen(1990). CometNuclei andTrojan Asteroids: A New Link and a
PossibleMechanismfor CometSplittings,Icarus, 86, 448-454.
Hartmann, Tholen, Meech, and Cruikshank (1990). 2060 Chiron: Colorimetry and Cometary
Behavior, Icarus, 83, 1-15.
Hartmann (1990). Additional Evidence About an Early Intense Flux of C Asteroids and the
Origin of Phobos, Icarus, 87, 236-240.
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Studies of relationships among outer solar system small bodies and related objects

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