{"paper":{"title":"Reconnaissance of the HR 8799 Exosolar System II: Astrometry and Orbital Motion","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"A. Sivaramakrishnan, A. Veicht, C. Baranec, C. Beichman, C. Zhai, D. Brenner, D. Hale, D. King, E. Cady, E. Rice, E. R. Ligon, F. Vescelus, G. Vasisht, I. R. Parry, J. E. Roberts, J. Hoffmann, J. K. Wallace, J. R. Crepp, J. R. Graham, L. C. Roberts Jr., L. Hillenbrand, L. Pueyo, M. Shao, N. Zimmerman, R. Burruss, R. Dekany, R. Nilsson, R. Oppenheimer, R. Soummer, S. Hinkley, S. Luszcz-Cook, T. Lockhart, T. Truong","submitted_at":"2014-09-23T02:19:02Z","abstract_excerpt":"We present an analysis of the orbital motion of the four sub-stellar objects orbiting HR8799. Our study relies on the published astrometric history of this system augmented with an epoch obtained with the Project 1640 coronagraph + Integral Field Spectrograph (IFS) installed at the Palomar Hale telescope. We first focus on the intricacies associated with astrometric estimation using the combination of an Extreme Adaptive Optics system (PALM-3000), a coronagraph and an IFS. We introduce two new algorithms. The first one retrieves the stellar focal plane position when the star is occulted by a c"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1409.6388","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}