(5447) Lallement Main-belt Asteroid

Discovered on 6 August 1991 by H. E. Holt at Palomar.

Named in honor of Rosine Lallement (b. 1951), French astrophysicist working at the Service d´Aéronomie in Verrières-le-Buisson. Lallement was the first to identify the local interstellar cloud, a few parsecs in diameter, which the sun is currently traversing. At a larger scale (100 parsecs), using new stellar distances from Hipparcos, she has studied the boundary of the interstellar local bubble, a region of very low interstellar density and high temperature, and she has discovered a hole in the local bubble, called the local tube, connecting it to the galactic halo. Name suggested and citation prepared by M. A. Barucci and M. Fulchignoni.Naming citation (19990728/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL

Where Lallement is today

Seen from above the solar system on 2026-10-14: Lallement is 3.22 au from the Sun and 3.55 au from Earth. Computed from JPL's orbital elements.

Facts

Number	5447
Provisional designation	1991 PO14
Orbit class	Main-belt Asteroid
Diameter	11.0 km (#4,565 largest of 17,440 named asteroids with a measured size)
Albedo	0.175
Rotation period	7.64 hours
Absolute magnitude (H)	12.59
Orbital period	5.13 years
Semi-major axis	2.97 au
Perihelion – aphelion	2.73 – 3.22 au
Eccentricity	0.0836
Inclination	9.78°
Closest distance between its orbit and Earth's (MOID)	1.76 au

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

Also discovered on 6 August 1991

More named asteroids discovered by H. E. Holt

All 119

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