(2157) Ashbrook Main-belt Asteroid

Discovered on 7 March 1924 by K. Reinmuth at Heidelberg.

Named in honor of Joseph Ashbrook, Editor of “Sky and Telescope”, co-discoverer of periodic comet Ashbrook-Jackson. His extensive professional background in astronomy, together with his encyclopedic knowledge of intriguing and obscure astronomical facts and fancies, have secured for “Sky and Telescope” a unique position as a vital source of information, not only for professional astronomers and historians of science, but also for amateur astronomers of all levels of expertise. Name proposed by N. Sperling; endorsed by C. M. Bardwell and B. G. Marsden.Naming citation (MPC 5284), IAU / Minor Planet Center, via NASA/JPL

Where Ashbrook is today

Seen from above the solar system on 2026-10-14: Ashbrook is 2.57 au from the Sun and 3.56 au from Earth. Computed from JPL's orbital elements.

Facts

Number	2157
Provisional designation	A924 EF
Orbit class	Main-belt Asteroid
Diameter	13.4 km (#3,565 largest of 17,440 named asteroids with a measured size)
Albedo	0.170
Rotation period	147 hours
Spectral type	S
Absolute magnitude (H)	12.14
Orbital period	4.64 years
Semi-major axis	2.78 au
Perihelion – aphelion	2.47 – 3.09 au
Eccentricity	0.111
Inclination	8.62°
Closest distance between its orbit and Earth's (MOID)	1.48 au

Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.

Also named after someone called Joseph

All asteroids named after someone called Joseph

Also discovered on 7 March 1924

More named asteroids discovered by K. Reinmuth

All 394

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