Author

E. MacLennan

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Open access Sep 2026

Thermophysical characterization of the potentially hazardous near-Earth object 2024 YR4

The asteroid 2024 YR_4 is a potentially hazardous Apollo-type near-Earth object. Its highly eccentric orbit produces close Earth-Moon encounters roughly every 4 years. Based on the astrometry collected during the discovery apparition, the asteroid had a 4% probability of a lunar impact on 2032 December 22. A collection...

T. Müller, E. MacLennan, A. Burdanov et al. · Astronomy & Astrophysics · 0 citations

Preprint Oct 2026

Physical characterization of Earth's quasi-satellite 2025 PN7

A hypothetical origin as lunar ejecta for Earth's quasi-satellites (QS) has gained initial support in recent years, but there is scarce photometric and/or spectroscopic data to support the premise due to the rare observational windows to obtain such data for these small objects. One of the key pieces of evidence suppor...

G. Fedorets, Z. Gray, Mikael Granvik et al. · 0 citations

Preprint Sep 2026

Nordic-based observations of binary asteroid (163693) Atira reveal a hydrated CM chondrite composition

We present photometric, spectroscopic, and polarimetric observations of (163693) Atira collected on the night of 05 March 2024. A dual-band lightcurve acquired in the V and R_C filters using the Mets\"ahovi Observatory (L08) in Kirkkonummi, Finland spans nearly 8~hours. From these measurements we estimate a V-R_C = 0.4...

E. MacLennan, G. Fedorets, Z. Gray et al. · 0 citations