ϑ҈ꗗ (List of Observers) - 2010-11 Apparition
| Observer | Location | Telescope | Days | | Disks | Maps | Animations | Others | Measurements |
| Akutsu, Tomio | Philippines | 35cm SC | 107 | | 1083 | | | 3 | 36 | 3788 |
| Akutsu, Hiroaki | Hokkaido, Japan | 28cm Refl. | 7 | | 90 | | | | | | | 154 |
| Asada, Hideto | Kyoto, Japan | 31cm Refl. | 48 | | 406 | 3 | | | | | | |
| Adachi, Makoto | Shiga, Japan | 31cm Refl. | 20 | * | 47 | | | | | | | | |
| Ikemura, Toshihiko | Aichi, Japan | 38cm Refl. | 57 | | 169 | | | | | | | 587 |
| Ishibashi, Tsutomu | Kanagawa, Japan | 31cm Refl. | 1 | | 4 | | | | | | | | |
| Einaga, Hideo | Hyogo, Japan | 30cm Refl. | 142 | | 1105 | 115 | | | | | 3408 |
| Enomoto, Takayuki | Tokyo, Japan | 20cm Refl. | 8 | | 12 | | | | | | | | |
| Ota, Satoshi | Okinawa, Japan | 30cm Refl. | 40 | | 80 | | | | | | | 504 |
| Oyamada, Hiroyuki | Gumma/Kanagawa, Japan | 20cm Refl. | 35 | | 61 | | | | | | | | |
| Kazemoto, Akira | Kyoto/Okinawa, Japan | 31cm/50cm Refl. | 70 | | 78 | | | | | | | 633 |
| Karasawa, Hideyuki | Tokyo, Japan | 30cm Refl. | 70 | | 97 | | | | | | | 45 |
| Kanno, Seiichi | Yamagata, Japan | 30cm Refl. | 36 | | 108 | | | | | | | 27 |
| Kumamori, Teruaki | Osaka, Japan | 28cm SC | 105 | | 216 | 2 | 5 | | | 2344 |
| Suzuki, Takashi | Tokyo, Japan | 18cm MC | 22 | | 32 | | | | | | | 102 |
| Takimoto, Ikuo | Kagawa, Japan | 31cm Refl. | 34 | | 79 | | | | | | | 48 |
| Tomita, Yasuaki | Gumma, Japan | 25cm Refl. | 5 | | 5 | | | | | | | | |
| Nakai, Kenji | Hiroshima, Japan | 25cm SC | 17 | | 18 | | | | | | | | |
| Hasebe, Takao | Aichi, Japan | 28cm SC | 54 | | 137 | | | | | | | 663 |
| Hatanaka, Akitoshi | Mie, Japan | 40cm Refl. | 39 | | 178 | 31 | | | | | 87 |
| Hayashi, Toshio | Kyoto, Japan | 35cm SC | 36 | | 144 | | | | | | | | |
| Fukui, Hideto | Shizuoka, Japan | 35cm SC | 12 | | 28 | | | | | | | 278 |
| Horikawa, Kuniaki | Kanagawa, Japan | 30cm/16cm Refl. | 101 | * | 159 | | | | | | | 572 |
| Mishina, Toshiro | Kanagawa, Japan | 20cm Refl. | 58 | | 179 | | | | | | | | |
| Yamazaki, Akihiro | Tokyo, Japan | 31cm Refl./28cm SC | 59 | | 231 | | | | | | | 229 |
| Yunoki, Kenkichi | Osaka, Japan | 26cm Refl. | 79 | | 270 | | | | | | | 642 |
| Yoneyama, Seiichi | Kanagawa, Japan | 25cm/20cm Refl. | 78 | | 176 | | | | | | | 64 |
| Abel, Paul | UK | 20cm/38cm/50cm Refl. | 23 | * | 35 | | | | | | | | |
| Arditti, David | UK | 35cm Refl. | 1 | | 5 | | | | | | | | |
| Carvalho, Fabio | Brazil | 25cm Refl. | 13 | | 27 | | | 1 | | | 327 |
| Delcroix, Marc | France | 25cm SC | 30 | | 200 | | | 2 | | | 488 |
| Go, Christopher | Philippines | 28cm SC | 86 | | 293 | | | 3 | | | 1526 |
| Kowollik, Silvia | Germany | 20cm/80cm Refl. | 9 | | 47 | 3 | | | | | 2 |
| Olivetti, Tiziano | Thailand | 41cm Refl. | 13 | | 63 | | | | | | | 205 |
| Parker, Donald | USA | 40cm Refl. | 14 | | 48 | | | | | | | 492 |
| Pellier, Christophe | France | 25cm Refl. | 25 | | 145 | | | | | | | 272 |
| Phillips, Jim | USA | 25cm MC | 15 | | 19 | | | | | | | 363 |
| Tatum, Randy | USA | 25cm Refl. | 5 | | 6 | | | | | | | | |
| Tyler, Dave | UK | 35cm SC | 1 | | 6 | | | | | | | | |
| Walker, Sean | USA | 30cm Refl. | 2 | | 6 | | | | | | | | |
| Wesley, Anthony | Australia | 33cm Refl. | 56 | | 105 | | | | | | | 948 |
| Total | | | | | 6197 | 154 | 14 | 36 | 18798 |
|
| * | visual observation |