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For the proposed Keplerian frequency as an upper limit to kHz QPO, the spin effects in Kerr Spacetime are discussed, which have about a 5% (2%) modification for that of the Schwarzchild case for the spin frequency of 1000 (400) Hz.The application to the four typical QPO sources, Cir X-1, Sco X-1, SAX J1808.4-3658 and XTE 1807-294, is mentioned."},"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":"0912.0768","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/3.0/","primary_cat":"astro-ph.HE","submitted_at":"2009-12-04T03:56:20Z","cross_cats_sorted":[],"title_canon_sha256":"9a83e50d2786a598f005be6f6ba8e6aebd7fb4819f3fe7b898904aef0dbb515b","abstract_canon_sha256":"ece81311d675c225d278a66a03b59da358514d0f1bc208ea207c71b76e2727d9"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:34:02.319501Z","signature_b64":"MV6+c9o0ZNTcO2OcPJyz729K8MhXdELZNO+7aFfWTH7j6OvlI+wroscsvFzpTtI9/+6xBAXwKFeD/o1wyJzhBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"17c5ab61f3cdd260ae79287a7d11872a4b292cb3c2224fc12e76ae8960f547ce","last_reissued_at":"2026-05-18T02:34:02.319010Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:34:02.319010Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The emission positions of kHz QPOs and Kerr spacetime influence","license":"http://creativecommons.org/licenses/by/3.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"C.M. 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