Doublestar analysis of lunar occultation of SAO188407 in Mar.20 2009

Observed by Hideyoshi Karasaki

and Masayuki Ishida

Analized by Kazuhisa Miyashita

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Catalogue details Fig.1    Information of star details by OCCULT Ver.4 Observation 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. Analysis 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) Result Nerima 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 Moriyama 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 The difference about magnitude between two observations might be generated by the large scintillation at the low altitude on these event. Astrometry    Calclation of astrometry Fig. 4   Position of components. Red cross is the component's position obtained from occultation observations. Component's position angle is close to the catalogue, but separation is 1.7 times larger than catalogue.