Engineering topics

Klinglesmith, Daniel A., III

Publications and source records attributed to Klinglesmith, Daniel A., III.

6 records

NASA NTRS1991

Imaging studies of comets

The Joint Observatory for Cometary Research's (JOCR) historical mission has been to provide understanding of large-scale interactions between bright comets and solar wind using wide-angle (Schmidt) imagery and spacecraft data; in this pursuit the JOCR has excelled. The 16 inch Newtonian/Cassegrain telescope was upgraded to permit filtered, narrow-field charge coupled device (CCD) imaging of both bright and faint comets. Thus, the goal of obtaining narrow-band imagery of the near-nuclear region of bright comets was added to JOCR's original mission with emphasis on ionization processes and total gas production. A 300 mm lens/CCD system exists with 3 degree field of view (FOV) which uses comet filters; this system bridges the gap between the wide-field (8 x 10 deg) Schmidt plates and the several-arcmin. field of the 16 inch telescope. JOCR is located under dark skies on South Baldy Mountain (el. 10,600 ft.) near Socorro, NM, and is one of the last truly dark sites in the continental U.S.

Niedner, Malcolm B., Jr.↗

NASA NTRS1991

Time-lapse CCD imagery of plasma-tail motions in Comet Austin

The appearance of the bright comet Austin 1989c1 in April-May of 1990 allowed us to test a new imaging instrument at the Joint Observatory for Cometary Research (JOCR). It is a 300mm lens/charge coupled device (CCD) system with interference filters appropriate for cometary emissions. The 13 frames were made into a time-lapse movie showing the evolution of the plasma tail. We were able to follow at least two large-scale waves out through the main tail structure. During the sequence, we saw two new tail rays form and undergo similar wave motion.

Klinglesmith, Daniel A., III↗

NASA NTRS1987

Deep Einstein X-ray imagery of the Small Magellanic Cloud

Deep Einstein IPC imagery of about 50 percent of the main body and 'wing' of the SMC has been obtained and analyzed. The four X-ray images have exposure times between 12,000 and 24,000 s and reveal a total of 25 X-ray sources. Twelve of these sources are new detections. Two, possibly three, sources with soft spectra may be newly discovered supernova remnants. The rest of the sources have harder spectra and intrinsic X-ray luminosities in the range log L(x) = 34.0-35.0 and are most likely stellar objects in the SMC. These luminosities are much lower than that found for typical Galactic X-ray binaries, and a factor of 100 larger than the range for 'normal' galactic O and B stars.

Bruhweiler, Frederick C.↗

NASA NTRS1986

Cyanogen jets in comet Halley

Emission-band and continuum data were obtained of Comet Halley with a CCD camera system at the Perth Observatory during the post-perihelion phase. The image processing techniques which were applied and which revealed jets in the CN band are described. The jets had a spiral shape due to nucleus rotation at a rate which was not precisely determined. Estimates are made of the FWHM and half-width half-maximum spatial extent of the jets. Possible parent molecules of the CN jets are discussed.

Ahearn, Michael F.↗

NASA NTRS1986

Gaseous jets in Comet P/Halley

Properties of the gas jets in P/Halley reported to exist in images taken in the light of CN are described. The jets also exist in the light of other radicals, specifically C2. The jets do not exist in the continuum images although it appears that one of the jets seen may come from the same area on the nucleus that produces much of the dust. The jets are seen to persist, although with varying geometry, for 2 months or more, from the time of the spacecraft encounters in March to the beginning of May. The strength of the jets is well correlated with fluctuations in the overall production rate of radicals by the comet.

Ahearn, Michael F.↗

NASA NTRS1986

Ion morphology in the inner tail of Comet P/Halley

Comet Halley CCD images taken in the light of CO(+) and H2O(+) were analyzed. Most of the ionic emission originates in a diffuse component on which the ion ray structure appears to be superimposed. On average, the peak enhancement in the CO(+) rays is 20% over the adjacent minima, where the emission is due to the underlying component. The H2O(+):CO(+) ratio varies by as much as 30% from ray to ray.

Hoban, Susan↗