| Observer | Location | Telescope | Images/Drawings | |
|---|---|---|---|---|
| Adachi, Makoto | (Otsu, Japan) | 31cm Refl. | 6 | drawings |
| Einaga, Hideo | (Hyogo, Japan) | 25cm Refl. | 39 | images, 1 map |
| Fukui, Hideto | (Shizuoka, Japan) | 25cm Refl. | 17 | images |
| Hatanaka, Akitoshi | (Mie, Japan) | 40cm Refl. | 11 | images |
| Hayashi, Toshio | (Kyoto, Japan) | 35cm SCT | 4 | images |
| Horikawa, Kuniaki | (Yokohama, Japan) | 16cm Refl. | 5 | drawings |
| Ikemura, Toshihiko | (Nagoya, Japan) | 31cm Refl. | 17 | images |
| Kanno, Seiichi | (Yamagata, Japan) | 25cm Refl. | 2 | images |
| Kazemoto, Akira | (Kyoto, Japan) | 31cm Refl. | 10 | images |
| Kumamori, Teruaki | (Osaka, Japan) | 60cm Refl. | 7 | images |
| Mishina, Toshiroh | (Yokohama, Japan) | 20cm Refl. | 33 | images |
| Miyazaki, Isao | (Okinawa, Japan) | 40cm Refl. | 48 | images |
| Narita, Hiroshi | (Kawasaki, Japan) | 20cm Refr. | 14 | drawings |
| Oyamada, Hiroyuki | (Hadano, Japan) | 20cm Refl. | 1 | image |
| Takimoto, Ikuo | (Kagawa, Japan) | 31cm Refl. | 79 | images |
| Tatum, Randy | (USA) | 25cm Refl. | 1 | image |
| Tomita, Yasuaki | (Gunma, Japan) | 25cm Refl. | 17 | images |
| Yoneyama, Seiichi | (Yokohama, Japan) | 20cm Refl. | 10 | images |
| Yunoki, Kenkichi | (Osaka, Japan) | 20cm Refl. | 73 | images |
NEBn white oval (WSZ), which merged with WSY late June, was at II:172.3 deg. (Aug. 16, Miyazaki). It became larger to 7.5 deg. in length, and was overwhelming other NEBn white spots in size. Since it kept the same prograding speed of -0.57 deg./day as before merger, WSZ was rapidly approaching another white spot. The distance of both spots decreased to 15 deg. in longitude late August. These spots will merge near future, but it may be difficult to observe their merger, because it will take place near solar conjunction.
EZ was dusky as before. EZn contained large festoons spaced about 30 deg. apart, and EB became darker and broader. Southern part of EZ was dull yellowish, having disturbed region between I:300 and 30 deg., where dusky EZs and SEBn merged and SEB looked narrower than usual. SEBn rift formed last month located at the f. end of this region, but it became weak and inconspicuous. However, light patch in EZs around outlet of the rift suggested that white cloud in SEBZ flew out of the rift into EZs and were pilling up there. Since the rift almost encircled the planet and was approaching RS at the end of the month, it is expected to be conspicuous after passage. In addition, Ikemura pointer out that dark portions at I:300 deg. and 30 deg. were reddish, though dark markings in EZs were generally bluish.
BA was at II:91.8 deg. on Aug. 23 (Kumamori), and had finished the passage of RS. During encounter with RS, reddish core and peripheral region showed no changes. BA became somewhat elongated white oval after passage, being major axis of about 13 deg., which was two-third of RS. RS was a typical aspect for RS after a long time, disappearing arch on south edge. It was distinct and reddish though a little faint. Though dark streak preceding RS was still visible in a sector preceding II:30 deg. at the beginning of the month, it almost disappeared by late August, when shadings remained as a trace along SEBs edge. The longitude of RS was II:113.1 deg. (Aug. 23, Kumamori), almost stationary since May. Because rotation period of RS tends to be shorter, when it becomes Hollow, this halt may be a result of formation of arch and streak.
Mid-SEB outbreak was still continuing activity, which started 9 months ago. Source position was at about II:215 deg. on Aug. 4, but it became difficult to limit the region after mid-August, because SEBn thickened following II:180 deg. The region of outbreak was filled with irregular white spots, but there were few conspicuous ones. The region will continue to shrinkage from now on, and this outbreak will come to an end.
(September 7, K. Horikawa)
(Translated on January 26)
[Fig.1] Jupiter in August |
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| (Left) RS and BA after passage. (Right) NEBn WSZ and disturbed region in EZs. |