Sigma Cancri
title: "Sigma Cancri" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["bayer-objects", "cancer-(constellation)"] topic_path: "general/bayer-objects" source: "https://en.wikipedia.org/wiki/Sigma_Cancri" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0
The Bayer designation Sigma Cancri (σ Cnc / σ Cancri) is shared by three star systems, in the constellation Cancer:
- σ1 Cancri, which has the Flamsteed designation 51 Cancri
- σ2 Cancri, which has the Flamsteed designation 59 Cancri
- σ3 Cancri, which has the Flamsteed designation 64 Cancri
The above correspondence between Flamsteed and Bayer designations is the modern one, which is based on the Atlas Coelestis Novus, published by Eduard Heis in 1872. An alternate correspondence sometimes encountered, for instance in the 1835 astronomical catalogue of Thomas Brisbane, is:
- σ1 Cancri = 46 Cancri
- σ2 Cancri = 57 Cancri
- σ3 Cancri = 61 Cancri Johann Bayer's Uranometria places the sigma between these two groups of stars, making proper association uncertain.
In Johann Bode’s Uranographia, the former is recognised as Sigma Cancri, but with 66 Cancri designated as σ4. Ths designation is seldom used nowadays.
References
- The Bright Star Catalogue, 5th Revised Ed.
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