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Updated: Dec 20, 2025

Scattering And Absorption of Light in Planetary Regoliths

Scattering And Absorption of Light in Planetary Regoliths

Published on: July 1, 2019

(31345) 1998 PG: A BINARY NEAR-EARTH ASTEROID?

Brian D Warner¹, Petr Pravec², Amadeo Aznar Macías³

¹Center for Solar System Studies, 446 Sycamore Ave., Eaton, CO 80615 USA.

The Minor Planet Bulletin

|May 27, 2020

Summary

This summary is machine-generated.

Near-Earth asteroid (31345) 1998 PG likely has a binary companion. Observations in 1998 and 2018 revealed differing secondary periods, suggesting a complex system requiring further study.

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Area of Science:

Astronomy and Astrophysics
Planetary Science

Background:

Near-Earth asteroids (NEAs) are crucial for understanding solar system formation.
Asteroid (31345) 1998 PG was previously observed by Pravec et al. in 2000.

Purpose of the Study:

To re-examine the rotational and orbital characteristics of NEA (31345) 1998 PG.
To investigate the potential binary nature of the asteroid system.

Main Methods:

Photometric observations were conducted in 1998 and 2018.
Lightcurve data analysis was performed to determine rotational and secondary periods.
Comparison of data from different apparitions to assess system stability.

Main Results:

A primary rotation period of approximately 2.516 hours was consistently observed.
A secondary period was detected, differing significantly between the 1998 (7.0035 h) and 2018 (approx. 16 h) observations.
Lightcurves indicated mutual events (occultations/eclipses), supporting a binary system.

Conclusions:

Asteroid (31345) 1998 PG is very likely a binary system.
The system's parameters, beyond the primary rotation, are currently ill-defined.
Future observations are necessary to refine the system's parameters.