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(born 1952) is a Japanese astronomer at Gekko Observatory and prolific discoverer of 61 asteroids as credited by the Minor Planet Center, and include the binary asteroid 4383 Suruga, the potentially hazardous object (7753) 1988 XB and the Jupiter trojan 4715 Medesicaste.
Japan Spaceguard Association (JSGA) is keen to have astronomical education for young people and held Spaceguard Private Investigator of the Stars— the fugitives are asteroids! program in 2001. Yoshiaki Oshima participated as one of the committee member. JSGA submitted a paper on that project in a proceedings, with Oshima as a contributor.
JSGA held an astronomical education program as part of their International Asteroid Monitoring Project, that collaborated with the British Council and its International Schools' Observatory (ISO) program which had involved 12 teams of junior high to senior high school classes from Asian and European countries.
The Private Investigator of Stars was co-sponsored by the British Council which advised the International Asteroid Monitoring Project by coordinating observatory in the Canary islands and participating laboratories for ISO. Yomiuri Shimbun newspaper held an asteroid hunting contest for the JSGA and run articles on their pages. 438 school classes and other teams signed up with 1,317 indibivisuals, and 133 teams reported the results of their observation.
JSGA based its project headquarters in its observatory called Bisei Spaceguard Center, owned by the Japan Space Forum. An optical telescope on the Canary island has been operated by the staff of Astrophysics Research Institute at John Moore University in Liverpool, and images were transmitted to each classroom via internet connection.
The outer main-belt asteroid 5592 Oshima is named after him. The naming citation also mentions his contribution to the development of the instrumentation at the Nihondaira Observatory.
In 1988, Oshima discovered (7753) 1988 XB, a near-Earth object and potentially hazardous asteroid that approaches the orbit of Earth as close as 2.5 lunar distances. He also discovered 4715 Medesicaste, a 64-kilometer sized Jupiter trojan in 1989. By the end of the same year, he discovered 4383 Suruga a binary with a minor-planet moon. All discoveries he made at the Gekko Observatory (see table below).
| 3843 OISCA | 28 February 1987 | ||
| 4157 Izu | 11 December 1988 | ||
| 4261 Gekko | 28 January 1989 | ||
| 4293 Masumi | 1 November 1989 | ||
| 4383 Suruga | 1 December 1989 | ||
| 4403 Kuniharu | 2 March 1987 | ||
| 4715 Medesicaste | 9 October 1989 | ||
| 4840 Otaynang | 23 October 1989 | ||
| 5123 Cynus | 28 January 1989 | ||
| 5206 Kodomonomori | 7 March 1988 | ||
| 5258 Rhoeo | 1 January 1989 | ||
| 5282 Yamatotakeru | 2 November 1988 | ||
| 20 December 1989 | |||
| 5397 Vojislava | 14 November 1988 | ||
| 5730 Yonosuke | 13 October 1988 | ||
| 5740 Toutoumi | 29 November 1989 | ||
| 10 March 1988 | |||
| 2 December 1989 | |||
| 4 November 1989 | |||
| 28 January 1989 | |||
| 5 December 1988 | |||
| 10 October 1988 | |||
| 15 December 1988 | |||
| 19 February 1988 | |||
| 27 November 1989 |
| 19 February 1988 | |||
| 11 November 1988 | |||
| 11 November 1988 | |||
| 10065 Greglisk | 3 December 1988 | ||
| 13 November 1988 | |||
| 29 October 1989 | |||
| 9 October 1988 | |||
| 12 November 1988 | |||
| 7 December 1988 | |||
| 9 October 1988 | |||
| 9 March 1989 | |||
| 13934 Kannami | 11 December 1988 | ||
| 14843 Tanna | 12 November 1988 | ||
| 27 November 1989 | |||
| 9 October 1989 | |||
| 7 March 1988 | |||
| 11 November 1988 | |||
| 3 December 1988 | |||
| 21 November 1989 | |||
| 5 February 1989 | |||
| 20 November 1989 | |||
| 15 October 1988 | |||
| 2 November 1988 | |||
| 7 December 1988 | |||
| 25 November 1989 |
| 20 November 1989 | |||
| 5 February 1989 | |||
| 20 November 1989 | |||
| 15 October 1988 | |||
| 10 February 1989 | |||
| 21 November 1989 | |||
| 25 October 1989 | |||
| 23 October 1989 | |||
| 25 October 1989 | |||
| 25 October 1989 | |||
| 29 October 1989 |