Doublestar analysis of lunar occultation of SAO188407 in Mar.20 2009
Observed by Hideyoshi Karasaki
and Masayuki Ishida
Analized by Kazuhisa Miyashita
Fig.1 Information of star details by OCCULT Ver.4
Place name Nerima, Tokyo, Japan
Observer Hideyoshi Karasaki
20090320191910.006X 27346BRD EG G0.04 1 F 31 BA
20090320191910.448X 27346ARD EG G0.04 1 B 31 BA
0.033 seconds of time delay by video camera's integration function was subtracted.
Fig.2 Limovie analysis (by Karasaki)
The step is visible clearly although measured points are scattered by air scintillation.
Diffraction fitting and photometry
Fig.3A Fitting Karasaki's observation to diffraction simulation.
Fig.3B Fitting Ishida's observation to diffraction simulation.
Elements of separation to the radial direction of lunar are 0.100(Karasaki) and 0.095(Ishida) arcsec. These are larger than expected value 0.059(Karasaki) and 0.056(Ishida)
|Object ||Phenomenon ||Time||magnitude||Component B ||Appearance ||19h19m10.039s +/- 0.034sec ||7.48
||Component A ||Appearance ||19h19m10.481s +/- 0.034sec||6.90
||Time difference ||0.442 sec
The difference about magnitude between two observations might be generated by the large scintillation at the low altitude on these event.
|Object ||Phenomenon ||Time||magnitude||Component B ||Appearance ||19h15m08.30s +/- 0.034sec ||7.20
||Component A ||Appearance ||19h15m08.67s +/- 0.034sec||7.11
||Time difference ||0.367 sec
Component's position angle is close to the catalogue, but separation is 1.7 times larger than catalogue.
Calclation of astrometry
Fig. 4 Position of components.
Red cross is the component's position obtained from occultation observations.