Search for L5 Earth Trojans with DECam

Abstract

Most of the major planets in the Solar System support populations of co-orbiting bodies, known as Trojans, at their L4 and L5 Lagrange points. In contrast, Earth has only one known co-orbiting companion. This paper presents the results from a search for Earth Trojans using the DECam instrument on the Blanco Telescope at CTIO. This search found no additional Trojans in spite of greater coverage compared to previous surveys of the L5 point. Therefore, the main result of this work is to place the most stringent constraints to date on the population of Earth Trojans. These constraints depend on assumptions regarding the underlying population properties, especially the slope of the magnitude distribution (which in turn depends on the size and albedo distributions of the objects). For standard assumptions, we calculate upper limits to a 90% confidence limit on the L5 population of $N_{ET}<1$ for magnitude $H<15.5$, $N_{ET}=60-85$ for $H<19.7$, and $N_{ET}$= 97 for $H=20.4$. This latter magnitude limit corresponds to Trojans $\sim$300 m in size for albedo $0.15$. At H=19.7, these upper limits are consistent with previous L4 Earth Trojan constraints and significantly improve L5 constraints.

arXiv comment17 pages, 12 figures, Accepted to MNRAS

References in corpus (21)

• Astropy: A Community Python Package for Astronomy
• The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
• REBOUND: An open-source multi-purpose N-body code for collisional dynamics
• The Dark Energy Camera
• astroquery: An Astronomical Web-Querying Package in Python
• The SDSS View of the Palomar-Green Bright Quasar Survey
• Solar System Objects Observed in the SDSS Commissioning Data
• The Orbital and Absolute Magnitude Distributions of Main Belt Asteroids
• Long-Term Stability of Horseshoe Orbits
• Characterizing Subpopulations within the Near Earth Objects with NEOWISE: Preliminary Results
• Asteroids in the Inner Solar System I - Existence
• Asymmetric impacts of near-Earth asteroids on the Moon
• The orbit of 2010 TK7. Possible regions of stability for other Earth Trojan asteroids
• Orbital Stability of Earth Trojans
• Small Jupiter Trojans Survey with Subaru/Hyper Suprime-Cam
• The current impact flux on Mars and its seasonal variation
• Reconstructing the size distribution of the primordial Main Belt
• Asteroid 2013 ND15: Trojan companion to Venus, PHA to the Earth
• Neptune Trojans and Plutinos: colors, sizes, dynamics, and their possible collisions
• The Case for a Deep Search for Earth's Trojan Asteroids
• Asteroid 2014 YX49: a large transient Trojan of Uranus

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