Cl399 (Brocchi's Cluster) - Association of Stars in Vulpecula

Cl399 is a Association of Stars in the Vulpecula constellation. Cl399 is situated close to the celestial equator and, as such, it is at least partly visible from both hemispheres in certain times of the year. Given its visual magnitude of 3.6, Cl399 is barely visible to the naked eye, easily visible with the help of a small binocular.

The image below is a photograph of Cl399 from the Digitized Sky Survey 2 (DSS2 - see the credits section) taken in the red channel. The area of sky represented in the image is 2.3333x2.3333 degrees (140.00x140.00 arcmins).

Celestial Coordinates

Apparent

J2000

Finder Chart

The simplified sky charts below show the position of Cl399 in the sky. The first chart has a field of view of 60° while the second one has a field of view of 10°.

Photometric Information

The following table lists the magnitude of Cl399 in different bands of the electomagnetic spectrum (when available), from the B band (445nm wavelength, corresponding to the Blue color), to the V band ( 551nm wavelength, corresponding to Green/Yellow color), to the J, H, K bands (corresponding to 1220nm, 1630nm, 2190nm wavelengths respectively, which are colors not visible to the human eye).

For more information about photometry in astronomy, check the photometric system article on Wikipedia.

Apparent Size

The following table reports Cl399 apparent angular size. The green area displayed on top of the DSS2 image of Cl399 is a visual representation of it.

Rise and Set Times

Today's Cl399 (Brocchi's Cluster) - Association of Stars in Vulpecula rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):