Analysis of the double star SAO99026 (XZ15398) occultation

Kazuhisa Miyashita

May. 26 2007

1. Abstract

Masayuki Ishida(Moriyama, Shiga, Japan) had observed occultation event of SAO99026. And Tomohisa Ohno(Kurashiki, Okayama, Japan) also observed this event. Ohno's video tape has been analyzed using Limovie by Kunio Kenmotsu(Soja, Okayama, Japan). Both CSV files are send to me to analyze the astrometry and magnitude. The result of analysis is below.

2. Limovie plot (double star event overview)

Figure 1. Disappearance observed at Moriyama, Shiga.

Figure 2. Reappearance observed at Moriyama, Shiga.

Figure 3. Disappearance observed at Kurashiki, Okayama.

3. Predictions

(1) For Kurashiki obs.

(2) For Konohama obs., Moriyama

4. Deffraction analysis

4-1 Kurashiki Obs. , Okayama

Figure 4. Disappearance of first event observed at Kurashiki, Okayama

Figure 5. Disappearance of second event observed at Kurashiki, Okayama

No.109 12h 13m 28.48s 12h 13m 28.47s

No.110 12h 13m 28.52s 12h 13m 28.50s

No.187 12h 13m 31.09s 12h 13m 31.07s

No.188 12h 13m 31.12s 12h 13m 31.10s

First event : No.109.5 Field +3 millisecond +/- 24 millisecond

then, the event central time is 12h 13m 28.49s + 0.003is +/- 0.024s = 12h 13m 28.49s +/- 0.02s

Second event : No.187.5 Field - 6 millisecond +/- 9 millisecond

then, the event central time is 12h 13m 31.10s – 0.006s +/- 0.009s= 12h 13m 31.09s +/- 0.01s

Time Difference = 78Frames - 9 millisecond = 78 / 29.97 - 0.033 second = 2.594 second +/- 0.033s

4-2 Konohama Obs., Moriyama, Shiga

4-2-1 Disappearance

Figure 6. Disappearance of first event observed at Moriyama, Shiga

Figure 7. Disappearance of first event observed at Moriyama, Shiga

First star : No.530 Frame -8 millisecond +/- 56 millisecond

then, the event central time is 12h 29m 18.20s – 8millisecond = 12h 29m 18.19s +/- 56 millisecond

Second star : No.1052 Frame+5 millisecond +/- 156 millisecond

then, the event central time is 12h 29m 35.62s +5millisecond = 12h 29m 35.63s +/- 156 millisecond

Time Difference = 522Frames +13 millisecond = 522 / 29.97 - 0.009 second = 17.419 second +/- 212 millisecond

4-2-2 Reappearance

Figure 8. Reappearance of first event observed at Moriyama, Shiga

Figure 9. Reappearance of second event observed at Moriyama, Shiga

First event : No.384 Frame +37 millisecond +/- 53 millisecond

then, the event central time is 12h 38m 24.34s + 37millisecond = 12h 38m 24.38s +/- 53 millisecond

Second star : No.898 Frame-50 millisecond +/- 120 millisecond

then, the event central time is 12h 38m 41.49s -50millisecond = 12h 38m 40.99s +/- 120 millisecond

Time Difference = 514Frames -87 millisecond = 514 / 29.97 - 0.087 second = 17.063 second +/- 173 millisecond

5. Astrometry

5-1 Disappearance – Reappearance , at Moriyama

5-2 Kurashiki - Disappearance at Moriyama

5-3 Kurashiki - Reappearance at Moriyama

5-4 Result

6. Photometry

6-1 Kurashiki

6-2 Disappearance at Moriyama

6-3 Reappearance at Moriyama

6-4 Result