NGC 6643 - Spiral Galaxy in Draco
NGC 6643 is a Spiral Galaxy in the Draco constellation. NGC 6643 is situated close to the northern celestial pole and, as such, it is visible for most part of the year from the northern hemisphere. Given its B magnitude of 11.8, NGC 6643 is visible with the help of a telescope having an aperture of 8 inches (200mm) or more.
The image below is a photograph of NGC 6643 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 0.5000x0.5000 degrees (30.00x30.00 arcmins).
Celestial Coordinates
Apparent
J2000
Finder Chart
The simplified sky charts below show the position of NGC 6643 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 NGC 6643 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.
The surface brightess reported below is an indication of the brightness per unit of angular area of NGC 6643.
Apparent Size
The following table reports NGC 6643 apparent angular size. The green area displayed on top of the DSS2 image of NGC 6643 is a visual representation of it.Morphological Classification
NGC 6643 - Spiral Galaxy in Draco is classified as Spiral (SAc) according to the Hubble and de Vaucouleurs galaxy morphological classification. The diagram below shows a visual representation of the position of NGC 6643 - Spiral Galaxy in Draco in the Hubble de Vaucouleurs sequence.
Credits for the background image: Antonio Ciccolella / M. De Leo / CC BY
Rise and Set Times
Location: Greenwich, UK
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London
NGC 6643 - Spiral Galaxy in Draco is circumpolar and transits at 02:46 UTC (altitude: 66.9°)