(27749) Tsukadaken Main-belt Asteroid
Discovered on 23 January 1991 by Endate, K., Watanabe, K. at Kitami.
Ken Tsukada (b.1982) is a Japanese astronomer and curator of astronomy at the Hiratsuka City Museum. He has made transit observation of exoplanet HD 17156 b, deriving physical parameters for the system. Ken participates in citizen science via the night-sky brightness survey of Hiratsuka City.Naming citation (WGSBN Bull. 4, #9, 13), IAU / Minor Planet Center, via NASA/JPL
Where Tsukadaken is today
Seen from above the solar system on 2026-10-14: Tsukadaken is 2.96 au from the Sun and 2.56 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 27749 |
| Provisional designation | 1991 BJ2 |
| Orbit class | Main-belt Asteroid |
| Diameter | 3.45 km (#14,103 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.340 |
| Absolute magnitude (H) | 14.5 |
| Orbital period | 4.18 years |
| Semi-major axis | 2.59 au |
| Perihelion – aphelion | 2.17 – 3.02 au |
| Eccentricity | 0.164 |
| Inclination | 3.57° |
| Closest distance between its orbit and Earth's (MOID) | 1.19 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Ken
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All asteroids named after someone called Ken