{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2014:NB2JKMHMZQJDIZU22Z4N2PXTE4","short_pith_number":"pith:NB2JKMHM","schema_version":"1.0","canonical_sha256":"68749530eccc1234669ad678dd3ef327035aaf60ede6f7b3ff47939aaa4234b6","source":{"kind":"arxiv","id":"1407.6660","version":1},"attestation_state":"computed","paper":{"title":"GRAVITY: the Calibration Unit","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"A. Amorim, A. Janssen, C. Straubmeier, E. Sturm, E. Wieprecht, F. Eisenhauer, F. Haussmann, G. Perrin, J. Weber, K. Perraut, L. Burtscher, M. Haug, M. Lippa, N. Blind, O. Hans, O. Pfuhl, S. Gillessen, S. Huber, S. Kellner, T. Ott, W. Brandner, Y. Kok","submitted_at":"2014-07-24T17:37:43Z","abstract_excerpt":"We present in this paper the design and characterisation of a new sub-system of the VLTI 2nd generation instrument GRAVITY: the Calibration Unit. The Calibration Unit provides all functions to test and calibrate the beam combiner instrument: it creates two artificial stars on four beams, and dispose of four delay lines with an internal metrology. It also includes artificial stars for the tip-tilt and pupil guiding systems, as well as four metrology pick-up diodes, for tests and calibration of the corresponding sub-systems. The calibration unit also hosts the reference targets to align GRAVITY "},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1407.6660","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2014-07-24T17:37:43Z","cross_cats_sorted":[],"title_canon_sha256":"2a12c6355def07f3d6895e56905651c46af9b2d0c65807345cf0026a3d45fa6d","abstract_canon_sha256":"bf87823d82fb68adbec598c731a05bf964c04e277f4278f7409f189d0ff398d4"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:45:48.294157Z","signature_b64":"JUDJrVGJrTXMMvUxoMpm8Sdw1j5Xhi3gugFSfsdIq2ttZHLXhAxpVUiKLCMAyuTndrKYxgr9rf+fyq8H86z0Bg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"68749530eccc1234669ad678dd3ef327035aaf60ede6f7b3ff47939aaa4234b6","last_reissued_at":"2026-05-18T02:45:48.292745Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:45:48.292745Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"GRAVITY: the Calibration Unit","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"A. Amorim, A. Janssen, C. Straubmeier, E. Sturm, E. Wieprecht, F. Eisenhauer, F. Haussmann, G. Perrin, J. Weber, K. Perraut, L. Burtscher, M. Haug, M. Lippa, N. Blind, O. Hans, O. Pfuhl, S. Gillessen, S. Huber, S. Kellner, T. Ott, W. Brandner, Y. Kok","submitted_at":"2014-07-24T17:37:43Z","abstract_excerpt":"We present in this paper the design and characterisation of a new sub-system of the VLTI 2nd generation instrument GRAVITY: the Calibration Unit. The Calibration Unit provides all functions to test and calibrate the beam combiner instrument: it creates two artificial stars on four beams, and dispose of four delay lines with an internal metrology. It also includes artificial stars for the tip-tilt and pupil guiding systems, as well as four metrology pick-up diodes, for tests and calibration of the corresponding sub-systems. The calibration unit also hosts the reference targets to align GRAVITY "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1407.6660","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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1407.6660","created_at":"2026-05-18T02:45:48.293732+00:00"},{"alias_kind":"arxiv_version","alias_value":"1407.6660v1","created_at":"2026-05-18T02:45:48.293732+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1407.6660","created_at":"2026-05-18T02:45:48.293732+00:00"},{"alias_kind":"pith_short_12","alias_value":"NB2JKMHMZQJD","created_at":"2026-05-18T12:28:41.024544+00:00"},{"alias_kind":"pith_short_16","alias_value":"NB2JKMHMZQJDIZU2","created_at":"2026-05-18T12:28:41.024544+00:00"},{"alias_kind":"pith_short_8","alias_value":"NB2JKMHM","created_at":"2026-05-18T12:28:41.024544+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/NB2JKMHMZQJDIZU22Z4N2PXTE4","json":"https://pith.science/pith/NB2JKMHMZQJDIZU22Z4N2PXTE4.json","graph_json":"https://pith.science/api/pith-number/NB2JKMHMZQJDIZU22Z4N2PXTE4/graph.json","events_json":"https://pith.science/api/pith-number/NB2JKMHMZQJDIZU22Z4N2PXTE4/events.json","paper":"https://pith.science/paper/NB2JKMHM"},"agent_actions":{"view_html":"https://pith.science/pith/NB2JKMHMZQJDIZU22Z4N2PXTE4","download_json":"https://pith.science/pith/NB2JKMHMZQJDIZU22Z4N2PXTE4.json","view_paper":"https://pith.science/paper/NB2JKMHM","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1407.6660&json=true","fetch_graph":"https://pith.science/api/pith-number/NB2JKMHMZQJDIZU22Z4N2PXTE4/graph.json","fetch_events":"https://pith.science/api/pith-number/NB2JKMHMZQJDIZU22Z4N2PXTE4/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/NB2JKMHMZQJDIZU22Z4N2PXTE4/action/timestamp_anchor","attest_storage":"https://pith.science/pith/NB2JKMHMZQJDIZU22Z4N2PXTE4/action/storage_attestation","attest_author":"https://pith.science/pith/NB2JKMHMZQJDIZU22Z4N2PXTE4/action/author_attestation","sign_citation":"https://pith.science/pith/NB2JKMHMZQJDIZU22Z4N2PXTE4/action/citation_signature","submit_replication":"https://pith.science/pith/NB2JKMHMZQJDIZU22Z4N2PXTE4/action/replication_record"}},"created_at":"2026-05-18T02:45:48.293732+00:00","updated_at":"2026-05-18T02:45:48.293732+00:00"}