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Roosen, R. G.

Publications and source records attributed to Roosen, R. G..

28 records · Page 2
All sourcesNASA NTRSDOE OSTI
NASA NTRS1972

A photoelectric study of Messier 81.

Results of photoelectric observations in B and V made at over 1200 locations in Messier 81, covering an area of approximately 169 square minutes of arc and including the galaxy's nucleus. Isophote maps in V and B based on these observations have been drawn. Two independent fits on the resulting V and B luminosity distributions yield average integrated magnitudes of V equals 6.94 and B equals 7.89. B - V and (integrated B) - (integrated V) are given as functions of distance from the center of the galaxy along the semimajor axis. A mass model is derived using a rotation curve based on the velocities measured by Muench (1959). The total mass of M81 is found to be 1.62 x 10 to the 11th solar masses. The final apparent mass-to-luminosity ratios in V and B are 11.2 and 15.1, respectively.

Brandt, J. C.↗
NASA NTRS1972

Interplanetary dust and comet orbits

Several years of observational results are available from the Pioneer 8 and 9 interplanetary dust detectors, and these data were used to show dust counts graphically. The characteristics of the five largest dust showers are also summarized.

Roosen, R. G.↗
NASA NTRS1971

The gegenschein

Gegenschein observational history and characteristic features, discussing theories regarding origin

Roosen, R. G.↗
NASA NTRS1971

Earth's dust cloud

Hypothetical geocentric /interplanetary/ dust cloud concentration detection possibility by earth shadow

Roosen, R. G.↗