19 Vulpeculae (abbreviated 19 Vul) is the Flamsteed designation of a star located in the northern constellation Vulpecula. The name follows the convention introduced by John Flamsteed in the early 18th century, whereby stars are numbered in order of increasing right ascension within a given constellation.
Astronomical identification
- Flamsteed designation: 19 Vulpeculae
- Other catalog entries: The star is included in several modern astronomical catalogs, such as the Henry Draper Catalogue (HD) and the Hipparcos Catalogue (HIP). Exact catalogue numbers can be obtained from databases such as SIMBAD or VizieR.
Location and visibility
- Constellation: Vulpecula, a small and relatively faint constellation in the northern sky.
- Apparent magnitude: The star is visible to the unaided eye under dark‑sky conditions; its visual magnitude is recorded in professional catalogs (exact value varies between sources).
- Coordinates: Precise right‑ascension and declination are listed in astrometric catalogs; they place the star within the boundaries defined for Vulpecula by the International Astronomical Union (IAU).
Physical characteristics
Detailed astrophysical parameters—including spectral type, luminosity class, radial velocity, parallax‑derived distance, and any known multiplicity—are documented in specialized astronomical databases. Access to these resources provides the most current and accurate measurements.
Historical and cultural context
The Flamsteed numbering system, of which 19 Vulpeculae is an example, was widely adopted in the 19th century and remains in common use for stars that do not possess traditional proper names or Bayer designations. The designation helps astronomers identify and cross‑reference stars across different catalogs and observational programs.
References
- Flamsteed, J. (1725). Historia Coelestis Britannica (original catalog of numbered stars).
- SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg (CDS).
- The Bright Star Catalogue (HR), Yale University.
Note: For precise numerical data (e.g., exact apparent magnitude, spectral classification, distance), users should consult contemporary astronomical databases, as values may be refined by ongoing observations.