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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Astronomy and Space Sciences
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Journal DOI :
The Korean Space Science Society
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Volume & Issues
Volume 6, Issue 2 - Dec 1989
Volume 6, Issue 1 - Jun 1989
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DETERMINATION OF VIBRATIONAL POPULATION DISTRIBUTION FOR THE
(1N) ION BAND SYSTEM FROM SPACELAB 1
Eun, Jong-Won ;
Journal of Astronomy and Space Sciences, volume 6, issue 2, 1989, Pages 75~89
The Spacelab 1 data represented the first multiband spectral measuremets of the
first negative ion bands system in the thermospheric dayglow, and the first opportunity to make a detailed comparison of the vibrational and rotational distributions over bands out to v'=5. The main purpose of this study was to decuced the excitation processes of
(1N) bands by determining vibrational population distributions for the upper states of
(1N). The vibrational population distributions to achieve a best fit to the measured Spacelab 1 data were summarized and also compared with those theoretically derived.
MEAN ORBITAL ELEMENTS FOR GEOSYNCHRONOUS ORBIT-I. -Semi-major, eccentricity, and longitude of perigee-
Journal of Astronomy and Space Sciences, volume 6, issue 2, 1989, Pages 91~100
The mean orbital elements for geosynchronou8s satellite are developed in terms of non-singular orbital elements. The true satellite position oscillates about the position calculated from the mean elements due to short period perturbations to the satellite motion. The displacement of a geostationary satellite from this mean orbit position is less than 1800m. The mean elements of ec are obtained.
ESTIMATION OF ORBITAL DECAY FOR THE SOVIET SATELLITE COSMOS 1402
Journal of Astronomy and Space Sciences, volume 6, issue 2, 1989, Pages 101~108
The algorithm was developed for the estimation of orbital decay of the Soviet Satellite COMOS 1402 which divides into three body-COSMOS 14020-A, B and C-and fell down early in 1983. The perturbation effects due to the nonspherical geopotential and air drag were considered and the standard atmospheric model were built for obtaining the atmospheric density as a function of the height. The orbital elements of NASA GSFC during orbital decay used in estimation of orbital decay. We compared the estimation values with the published ones of the American State Department. In the case of COSMOS 1402-C, the estimated values accorded with the published ones but, in the case of COSMOS 1402-A, the decay time and the approximated position differed respectively one minute and two degrees in both latitude and longitude from the published ones.
EXAMINATION OF ORBITAL PERIOD OF ZZ CANCRI
Kim, Ho-Il ; Kim, Sang-Seong ; Nha, Il-Seong ; Lee, Yong-Sam ;
Journal of Astronomy and Space Sciences, volume 6, issue 2, 1989, Pages 109~117
A total of 266 photoelectric observations(91 in V, 93 in B, and 82 in U) for an eclipsing binary, ZZ Cnc, has been secured by using the 61-cm reflector and an uncooled iP21 photomultiplier phototube of Yonsei University Observatory during 4 years from March 1984 to May 1988. One time of minimum light, JD 2446887.534 is obtained. Although Kim et al.(1988) suggested the possibility of the period change, the present study shows that the orbital period of ZZ Cnc should be constant. According in a reasonable interpretation of the eclipse light curves. Min I = JD Hel 2446887.574+25d.5944E
2 may be useflul as new light elements for future observations.
PHOTOELECTRIC OBSERVATIONS OF THE PRIMARY ECLIPSE OF AY PERSET
Nha, Il-Seong ; Kim, Jung-Rack ;
Journal of Astronomy and Space Sciences, volume 6, issue 2, 1989, Pages 119~125
UBV observations of the primary eclipse of Algol-type long period eclipsing binary AY Persei have been successfully made using the 61-cm reflector at the Ilsan Station of Yonsei University Observatory in September and October, 1989. These light curves furnish ones to deduce following results; (1) the total duration of the eclipse lasted for about 0.066(0.78 days) with no clear evidence of the existence of the totality, (2) the depths of mid-eclipse of
for V and B, respectively, (3) two times of minimum light, JD2447820.203 and JD 2447820.200 for V and B, respectively, and (4) no period variation with the improved light elements, Min I =JD2427152.237+
4 are made.
PHOTOELECTRIC OBSERVATIONS OF EPSILON AURIGAE FROM 1982 TO 1985
Journal of Astronomy and Space Sciences, volume 6, issue 2, 1989, Pages 127~135
The UBV observations of Epsilon Aurigae from April 1982 to May 1985 had been made at Yonsei University Observatory. The light curves drawn from the observational data are combined with other light curves which are well fitted. In these light curves, secondary light variations, flare activity, mid-eclipse light brightening, and others are checked precisely. Contact times and time of mid-eclipse are determined and compared with the values which were presented on the other papers. Compared with previous eclipses, it is noted that the duration of totality is gradually contracted and the duration of total eclipse is gradually enlarged. Though these phenomena are applied to the disk model which has been more accepted than any other models, those are not explained explicitly. So, a new model, comet model, is suggested and is found to make a neat description to the phenomena revealed on the light curves.