ϑ҈ꗗ (List of Observers) - 2008 Apparition
| Observer | Location | Telescope | Days | | Disks | Maps | Animations | Others | Measurements |
| Akutsu, Tomio | Philippines | 35cm SC | 65 | | 411 | | | | | | | 1428 |
| Akutsu, Hiroaki | Hokkaido, Japan | 28cm Refl. | 7 | | 34 | | | | | | | | |
| Asada, Hideto | Kyoto, Japan | 31cm Refl. | 31 | | 189 | 3 | | | | | | |
| Ikemura, Toshihiko | Aichi, Japan | 38cm Refl. | 27 | | 82 | | | | | | | 290 |
| Einaga, Hideo | Hyogo, Japan | 30cm Refl. | 119 | | 324 | 81 | | | | | 2113 |
| Oyamada, Hiroyuki | Kanagawa, Japan | 20cm Refl. | 4 | | 16 | | | | | | | | |
| Kazemoto, Akira | Kyoto/Okinawa, Japan | 31cm/50cm Refl. | 34 | | 58 | | | | | | | 594 |
| Kanno, Seiichi | Yamagata, Japan | 25cm Refl. | 28 | | 61 | | | | | | | | |
| Kumamori, Teruaki | Osaka, Japan | 20cm Refl. | 91 | | 157 | | | | | | | 1218 |
| Takimoto, Ikuo | Kagawa, Japan | 31cm Refl. | 20 | | 119 | | | 1 | | | 118 |
| Tomita, Yasuaki | Gumma, Japan | 25cm Refl. | 1 | | 1 | | | | | | | | |
| Nakai, Kenji | Hiroshima, Japan | 25cm MC | 7 | | 7 | | | | | | | | |
| Narita, Hiroshi | Kanagawa, Japan | 20cm Refr. | 32 | * | 64 | | | | | | | 2 |
| Neichi, Mitsuyuki | Aomori, Japan | 25cm Refl. | 2 | | 2 | | | | | | | | |
| Hayashi, Toshio | Kyoto, Japan | 35cm SC | 28 | | 46 | | | | | | | | |
| Hirabayashi, Isamu | Tokyo, Japan | 25cm Refl. | 1 | | 2 | | | | | | | 14 |
| Fukui, Hideto | Shizuoka, Japan | 35cm SC | 51 | | 86 | | | | | | | 496 |
| Horikawa, Kuniaki | Kanagawa, Japan | 16cm Refl. | 71 | * | 115 | | | | | | | 345 |
| Mishina, Toshiro | Kanagawa, Japan | 20cm Refl. | 28 | | 49 | | | | | | | | |
| Miyazaki, Isao | Okinawa, Japan | 40cm Refl. | 42 | | 111 | | | | | | | 1061 |
| Yunoki, Kenkichi | Osaka, Japan | 26cm Refl. | 62 | | 199 | | | | | | | 638 |
| Yoneyama, Seiichi | Kanagawa, Japan | 20cm Refl. | 57 | | 114 | 1 | | | | | 95 |
| Carvalho, Fabio | Brazil | 25cm Refl. | 12 | | 30 | | | | | | | 199 |
| Colville, Brian | Canada | 30cm SC | 1 | | 3 | | | | | | | | |
| Go, Christopher | Philippines | 28cm SC | 83 | | 200 | | | | | | | 1232 |
| Olivetti, Tiziano | Thailand | 28cm Refl. | 1 | | 2 | | | | | | | | |
| Pellier, Christophe | France | 25cm SC | 5 | | 17 | | | | | | | | |
| Phillips, Jim | USA | 20cm Refr. | 3 | | 6 | | | | | | | 51 |
| Salway, Mike | Australia | 30cm Refl. | 1 | | 1 | | | | | | | 20 |
| Walker, Sean | USA | 18cm Refl. | 2 | | 5 | | | 1 | | | | |
| Wesley, Anthony | Australia | 33cm Refl. | 49 | | 79 | | | | | 1 | 1093 |
| Total | | | | | 2590 | 85 | 2 | 1 | 11007 |
|
| * | visual observation |