Computer Science
Scientific paper
Oct 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981motc.conf....5d&link_type=abstract
In JPL Mod. Observational Tech. for Comets p 5-13 (SEE N82-13989 04-89)
Computer Science
Abundance, Chemical Composition, Comets, Albedo, Gas Analysis, Spectral Signatures, Surface Properties
Scientific paper
The atomic resonance lines of the major elements were observed in the atmospheres of a few comets, by using vacuum ultraviolet spectrographs on board rockets or orbiting observatories. Dust-to-gas ratios were also deduced for two comets through a Finson-Probstein's analysis of their dust-tail isophotes. The geometric albedo of the dust for the phase angle alpha of the observations is not accurately known but, the dust-to-gas ratio is not overly sensitive to the actual value of this albedo. Infrared observations of the dust head of some comets show that the bulk of cometary dust must be silicates, although a minor component (5-10 percent) of carbon compounds is rather likely, because of poor dielectric properties of the grains. This interpretation is confirmed by the fact that interplanetary dust probably of cometary origin, that was collected in the stratosphere by NASA-U2 Spacecraft, is chondritic in nature. Metal abundances in the head of a sungrazing comet support the chondritic hypothesis.
No associations
LandOfFree
Observing chemical abundances in comets does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Observing chemical abundances in comets, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Observing chemical abundances in comets will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1470082