Observation of two new L4 neptune trojans in the dark energy survey supernova fields

D. W. Gerdes, R. J. Jennings, G. M. Bernstein, M. Sako, F. Adams, D. Goldstein, R. Kessler, S. Hamilton, T. Abbott, F. B. Abdalla, S. Allam, A. Benoit-Lévy, E. Bertin, D. Brooks, E. Buckley-Geer, D. L. Burke, D. Capozzi, A. Carnero Rosell, M. Carrasco Kind, J. CarreteroC. E. Cunha, C. B. D'Andrea, L. N. Da Costa, D. L. Depoy, S. Desai, J. P. Dietrich, P. Doel, T. F. Eifler, A. Fausti Neto, B. Flaugher, J. Frieman, E. Gaztanaga, D. Gruen, R. A. Gruendl, G. Gutierrez, K. Honscheid, D. J. James, K. Kuehn, N. Kuropatkin, O. Lahav, T. S. Li, M. A.G. Maia, M. March, P. Martini, C. J. Miller, R. Miquel, R. C. Nichol, B. Nord, R. Ogando, A. A. Plazas, A. K. Romer, A. Roodman, E. Sanchez, B. Santiago, M. Schubnell, I. Sevilla-Noarbe, R. C. Smith, M. Soares-Santos, F. Sobreira, E. Suchyta, M. E.C. Swanson, G. Tarlé, J. Thaler, A. R. Walker, W. Wester, Y. Zhang

Research output: Contribution to journalArticle

9 Scopus citations


We report the discovery of the eighth and ninth known Trojans in stable orbits around Neptune's leading Lagrange point, L4. The objects 2014 QO441 and 2014 QP441 were detected in data obtained during the 2013-14 and 2014-15 observing seasons by the Dark Energy Survey, using the Dark Energy Camera (DECam) on the 4-m Blanco telescope at Cerro Tololo Inter-American Observatory. Both are in high-inclination orbits (18.°8 and 19.°4, respectively). With an eccentricity of 0.104, 2014 QO441 has the most eccentric orbit of the 11 known stable Neptune Trojans. Here we describe the search procedure and investigate the objects' long-term dynamical stability and physical properties.

Original languageEnglish (US)
Article number39
JournalAstronomical Journal
Issue number2
StatePublished - Feb 1 2016



  • minor planets, asteroids: general

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Gerdes, D. W., Jennings, R. J., Bernstein, G. M., Sako, M., Adams, F., Goldstein, D., Kessler, R., Hamilton, S., Abbott, T., Abdalla, F. B., Allam, S., Benoit-Lévy, A., Bertin, E., Brooks, D., Buckley-Geer, E., Burke, D. L., Capozzi, D., Rosell, A. C., Kind, M. C., ... Zhang, Y. (2016). Observation of two new L4 neptune trojans in the dark energy survey supernova fields. Astronomical Journal, 151(2), [39]. https://doi.org/10.3847/0004-6256/151/2/39