Asteroid Asteroid Asteroids are a class of small Solar System bodies in orbit around the Sun. They have also been called planetoids, especially the larger ones... s discovered: 45

} || March 10, 1988
|-
| 3996 Fugaku

3996 Fugaku

3996 Fugaku is a main-belt asteroid discovered on December 5, 1988 by Arai, M. and Hiroshi Mori at Yorii.- External links :*...

|| December 5, 1988
|-
| (4262) 1989 CO

(4262) 1989 CO

1989 CO is a small asteroid discovered by Masaru Arai and Hiroshi Mori on February 5, 1989 in Yorii.- See also :*List of asteroids/4201–4300...

|| February 5, 1989
|-
| 4291 Kodaihasu

4291 Kodaihasu

4291 Kodaihasu is a main-belt asteroid discovered on November 2, 1989 by Masaru Arai and Hiroshi Mori at Yorii.- External links :*...

|| November 2, 1989
|-
| (4495) 1988 VS

(4495) 1988 VS

1988 VS is an outer main-belt minor planet. It was discovered at the Yorii Observatory by Masaru Arai and Hiroshi Mori on November 6, 1988.-External links:*...

|| November 6, 1988
|-
| (4901) 1988 VJ

(4901) 1988 VJ

1988 VJ is a main-belt minor planet. It was discovered at the Yorii Observatory by Masaru Arai and Hiroshi Mori on November 3, 1988.-External links:*...

|| November 3, 1988
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| (5732) 1988 WC

(5732) 1988 WC

1988 WC is a Mars-crossing minor planet. It was discovered at the Yorii Observatory by Masaru Arai and Hiroshi Mori on November 29, 1988.-External links:*...

|| November 29, 1988
|-
| (5746) 1991 CK

(5746) 1991 CK

1991 CK is a main-belt minor planet. It was discovered at the Yorii Observatory by Masaru Arai and Hiroshi Mori on February 5, 1991.-External links:*...

|| February 5, 1991
|-
| (5913) 1990 BU

(5913) 1990 BU

1990 BU is a main-belt minor planet. It was discovered at the Yorii Observatory by Masaru Arai and Hiroshi Mori on January 20, 1990.-External links:*...

|| January 21, 1990
|-
| 6299 Reizoutoyoko

6299 Reizoutoyoko

6299 Reizoutoyoko is a main-belt asteroid discovered on December 5, 1988 by M. Arai and H. Mori at Yorii.- External links :*...

|| December 5, 1988
|-
| || March 14, 1991
|-
| (6380) 1988 CG

(6380) 1988 CG

6380 Gardel is a main-belt minor planet. It was discovered by Masaru Arai and Hiroshi Mori at the Yorii Observatory on February 10, 1988.-External links:*...

|| February 10, 1988
|-
| (6638) 1989 CA

(6638) 1989 CA

1989 CA is a main-belt minor planet. It was discovered by Masaru Arai and Hiroshi Mori at the Yorii Observatory on February 2, 1989.-External links:*...

|| February 2, 1989
|-
| (6703) 1988 CH

(6703) 1988 CH

1988 CH is a main-belt minor planet. It was discovered by Masaru Arai and Hiroshi Mori at the Yorii Observatory on February 10, 1988.-External links:*...

|| February 10, 1988
|-
| (6704) 1988 CJ

(6704) 1988 CJ

1988 CJ is a main-belt minor planet. It was discovered by Masaru Arai and Hiroshi Mori at the Yorii Observatory on February 10, 1988.-External links:*...

|| February 10, 1988
|-
| 6709 Hiromiyuki

6709 Hiromiyuki

6709 Hiromiyuki is a main-belt asteroid discovered on February 2, 1989 by M. Arai and H. Mori at Yorii.- External links :*...

|| February 2, 1989
|-
| || March 12, 1988
|-
| || December 2, 1988
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| (7409) 1990 BS || January 21, 1990
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| (7417) 1990 YE || December 19, 1990
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| (7522) 1991 AJ || January 9, 1991
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| (7570) 1989 CP || February 5, 1989
|-
| (7576) 1990 BN || January 21, 1990
|-
| || November 6, 1988
|-
| || November 10, 1988
|-
| (8506) 1991 CN || February 5, 1991
|-
| (9952) 1991 AK

(9952) 1991 AK

1991 AK is a main belt asteroid. It orbits the Sun once every 4.33 years.Discovered on January 9, 1991 by M. Arai and Hiroshi Mori, it was given the provisional designation "1991 AK".- References :...

|| January 9, 1991
|-
| || February 12, 1991
|-
| || March 8, 1989
|-
| || February 12, 1991
|-
| || December 7, 1988
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| (13017) 1988 FM || March 18, 1988
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| (15737) 1991 CL || February 5, 1991
|-
| || November 6, 1988
|-
| || November 10, 1988
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| (16526) 1991 DC || February 17, 1991
|-
| (19979) 1989 VJ || November 2, 1989
|-
| (20001) 1991 CM || February 5, 1991
|-
| (21017) 1988 VP || November 3, 1988
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| (23479) 1991 CG || February 5, 1991
|-
| || November 12, 1990
|-
| (43773) 1989 AJ || January 4, 1989
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| (48436) 1989 VK || November 2, 1989
|-
| (52269) 1988 CU || February 13, 1988
|-
| || March 1, 1989
|-
| colspan="2" style="font-size: smaller;" |

1. with Hiroshi Mori
   Hiroshi Mori (astronomer)
   is a Japanese astronomer.He is a prolific discoverer of asteroids.-References:...
   
   

|}
is a Japanese astronomer

Astronomer

An astronomer is a scientist who studies celestial bodies such as planets, stars and galaxies.Historically, astronomy was more concerned with the classification and description of phenomena in the sky, while astrophysics attempted to explain these phenomena and the differences between them using...

.

He is a prolific discoverer of asteroid

Asteroid

Asteroids are a class of small Solar System bodies in orbit around the Sun. They have also been called planetoids, especially the larger ones...

s, working mainly in collaboration with Hiroshi Mori

Hiroshi Mori (astronomer)

is a Japanese astronomer.He is a prolific discoverer of asteroids.-References:...

.

Arai discovered Comet Arai on 5 January 1991.

External links

• Asteroids discovered at Yorii