Flamsteed number

Definition

Flamsteed number is a numerical designation assigned to stars in the order of their right ascension within a constellation. Named after the English astronomer John Flamsteed, these numbers help in identifying and cataloging stars.

5 Must Know Facts For Your Next Test

1. Flamsteed numbers were introduced by John Flamsteed in his star catalog published in 1712.
2. They are used for stars visible to the naked eye and are typically accompanied by the genitive form of the constellation name.
3. Flamsteed numbers are applicable primarily to constellations in the northern hemisphere.
4. The system was developed before Bayer designations but is less commonly used today compared to other modern catalogs.
5. Flamsteed's catalog included over 3,000 stars, many of which still use their original Flamsteed numbers.

Review Questions

• Who introduced the Flamsteed numbering system and when?
• How are stars ordered within a constellation when assigned a Flamsteed number?
• Why might some stars only have Flamsteed numbers instead of more modern designations?

Related terms

Right Ascension: The angular distance measured eastward along the celestial equator from the vernal equinox.

Bayer Designation: A stellar designation system using Greek letters followed by the genitive form of a constellation's name.

Star Catalog: A list or database of stars that usually includes information on their positions and magnitudes.