ϑ҈ꗗ (List of Observers) - 2015-16 Apparition
| Observer | Location | Telescope | Days | | Disks | Maps | Animations | Others | Measurements |
| Akutsu, Tomio | Tochigi, Japan | 35cm SC | 38 | | 317 | | | | | 7 | 216 |
| Asada, Hideto | Kyoto, Japan | 31cm Refl. | 22 | | 69 | 2 | | | | | | |
| Adachi, Makoto | Shiga, Japan | 31cm Refl. | 35 | * | 77 | | | | | | | | |
| Ikemura, Toshihiko | Aichi, Japan | 38cm Refl. | 5 | | 6 | | | | | | | | |
| Ishibashi, Tsutomu | Kanagawa, Japan | 31cm Refl. | 17 | | 32 | | | | | | | | |
| Iwamasa, Ryuichi | Kanagawa, Japan | 35cm SC | 33 | | 168 | | | | | | | 642 |
| Einaga, Hideo | Hyogo, Japan | 30cm Refl. | 118 | | 399 | 104 | | | | | 3697 |
| Ota, Satoshi | Okinawa, Japan | 30cm Refl. | 20 | | 33 | | | | | | | 262 |
| Oyamada, Hiroyuki | Tokyo, Japan | 20cm Refl. | 4 | | 6 | | | | | | | | |
| Kanno, Seiichi | Yamagata, Japan | 30cm Refl. | 39 | | 375 | | | | | | | | |
| Kumamori, Teruaki | Osaka, Japan | 35cm SC | 31 | | 31 | | | | | | | 519 |
| Kozawa, Tokujiro | Tokyo, Japan | 35cm Refl. | 30 | | 77 | | | | | | | 396 |
| Suzuki, Takashi | Tokyo, Japan | 18cm MC | 2 | | 2 | | | | | | | 12 |
| Hatanaka, Akitoshi | Mie, Japan | 30cm Refl./28cm SC | 31 | | 50 | | | | | | | 111 |
| Horiuchi, Tadashi | Kyoto, Japan | 30cm Refl. | 25 | | 83 | | | | | | | 273 |
| Horikawa, Kuniaki | Kanagawa, Japan | 30cm Refl. | 127 | * | 233 | | | | | | | 718 |
| Mishina, Toshiro | Kanagawa, Japan | 20cm Refl. | 21 | | 47 | | | | | | | | |
| Miyazaki, Isao | Okinawa, Japan | 40cm Refl. | 162 | | 287 | | | | | | | 3768 |
| Yamazaki, Akihiro | Tokyo, Japan | 32cm Refl. | 12 | | 12 | | | | | | | 212 |
| Yoshida, Tomoyuki | Tochigi, Japan | 30cm Refl. | 12 | | 30 | | | | | | | 72 |
| Yoneyama, Seiichi | Kanagawa, Japan | 25cm Refl. | 55 | | 152 | | | | | | | 207 |
| Abel, Paul | UK | 20cm Refl. | 12 | * | 17 | | | | | | | | |
| Delcroix, Marc | France | 32cm/106cm/20cm Refl. | 17 | | 98 | 1 | | | | | 117 |
| Go, Christopher | Philippines | 35cm SC | 106 | | 399 | | | 1 | 7 | 2983 |
| Kowollik, Silvia | Germany | 15cm Refl. | 1 | | 1 | | | | | | | | |
| Olivetti, Tiziano | Thailand | 41cm Refl. | 48 | | 184 | | | | | | | 1921 |
| Pellier, Christophe | France | 25cm Refl. | 5 | | 16 | | | | | | | 79 |
| Phillips, Jim | USA | 25cm MC | 6 | | 6 | | | | | | | 62 |
| Wesley, Anthony | Australia | 33cm Refl. | 71 | | 92 | | | 1 | | | 561 |
| Total | | | | | 3299 | 107 | 2 | 14 | 16828 |
|
| * | visual observation |