Cross validation of albedo determination for 1627 Ivar from three different techniques

TL;DR

This study compares three different techniques—improved absolute magnitude, thermophysical modeling, and polarimetry—to determine the albedo of asteroid 1627 Ivar, demonstrating their consistency and proposing a reliable albedo estimate.

Contribution

It introduces a cross-validation approach for asteroid albedo determination using multiple independent methods, enhancing reliability and efficiency.

Findings

Albedo estimates from three techniques are consistent.

Proposed Ivar's albedo as 0.24 with uncertainty.

Supports polarimetry as a rapid, independent characterization method.

Abstract

Near Earth Asteroids are of great interest to the scientific community due to their proximity to Earth, making them both potential hazards and possible targets for future missions, as they are relatively easy to reach by spacecraft. A number of techniques and models can be used to constrain their physical parameters and build a comprehensive assessment of these objects. In this work, we compare physical property results obtained from improved $H_V$ absolute magnitude values, thermophysical modeling, and polarimetry data for the well-known Amor-class NEO 1627 Ivar. We show that our fits for albedo are consistent with each other, thus demonstrating the validity of this cross-referencing approach, and propose a value for Ivar's albedo of $0.24^{+0.04}_{-0.02}$ . Future observations will extend this work to a larger sample size, increasing the reliability of polarimetry for rapid asteroid property characterization, as a technique independent of previously established methods and requiring significantly fewer observations.