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It is well known that the radial Boyer-Lindquist coordinates of the prograde photon orbit $r=r_{\\rm ph}$, marginally bound orbit $r=r_{\\rm mb}$ and innermost stable orbit $r=r_{\\rm ms}$ of the extreme Kerr black hole all coincide with the event horizon's value $r=r_+$. We find that for the extreme Kerr-Newman black hole with mass $M$, angular momentum $J$ and electric charge $Q=\\pm\\sqrt{M^2-J^2/M^2}$ ($|J|\\le M^2$) the coordinate equalities $r_{\\rm ph}=r_+$, $r_{"},"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":"1503.01973","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2015-03-06T14:36:59Z","cross_cats_sorted":["astro-ph.HE","hep-th"],"title_canon_sha256":"561a4c75c37edc976a4f7220a83d1923c67600357abb9adbbd6d1c612c8cde7b","abstract_canon_sha256":"c6de6b9c75534826272b1026a48ec42c5a8b84841c8b8e951a70badba04f53d2"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:37:29.747848Z","signature_b64":"bVDBObNpKKgGB5EZ/UgZ5nRgUwQDm3ksRCwFVisn4joQpqY7sid/EEjspK1q1F3GL/3tdVfsMtof+uBFhj7PCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ad334190d53fb6f5fdd773860affdc55332f87a111d9a4ded4260f18139b7b60","last_reissued_at":"2026-05-18T01:37:29.747223Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:37:29.747223Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"A note on circular geodesics in the equatorial plane of an extreme Kerr-Newman black hole","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.HE","hep-th"],"primary_cat":"gr-qc","authors_text":"Reinhard Meinel, Sebastian Ulbricht","submitted_at":"2015-03-06T14:36:59Z","abstract_excerpt":"We examine the behaviour of circular geodesics describing orbits of neutral test particles around an extreme Kerr-Newman black hole. 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