Your Guide to the Solar System and the Night Sky
Content Menu
Major Objects Bright Comets Asteroids Near Earth Objects Space Probes Constellations & Deep Sky Objects Supernovae Solar Eclipses
3D Solar System Viewer Online Planetarium
Set Observing Location What is Visible Now Tonight's Observing Guide Moon Calendar Create Quick Access Page
Articles Donate
About
Feedback
Objects
Major Objects Bright Comets Asteroids Near Earth Objects Space Probes Constellations & Deep Sky Objects Supernovae
Charts
3D Solar System Viewer Online Planetarium
Plan Observations
Set Observing Location What is Visible Now Tonight's Observing Guide Moon Calendar Create Quick Access Page
Solar Eclipses
More
Articles Donate
About
Feedback
✖ This site is free and ad-free thanks to the support of our users. If you can, please consider a donation.
public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 7:04  
clear_day Transit: 12:47  
SunsetSet: 18:30 south
sunny  • Daytime • What's Visible Now

Support us

If you like TheSkyLive.com please consider a donation to support this project. Thank you!

In Evidence

Best Places to See the 2024 American Eclipse Based on Historical Weather Data
Using historical cloud coverage data we suggest the locations that could provide the better chances to have clear skies on April 8, 2024 to observe the eclipse. Read more...

Other deep sky objects in Draco
All Constellations »  Draco »  Deep Sky Objects » 

NGC 6643 - Spiral Galaxy in Draco

Altitude: 44.4°   Azimuth: 20.6°   Direction: North-North-East

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.

NGC 6643
Galaxy
Draco

NGC 6643 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 44.4°
Azimuth: 20.6°
Direction: North-North-East

See also NGC 6643 rise and set times.

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.

Available Resources for NGC 6643 - Spiral Galaxy in Draco

Photometric information of NGC 6643

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).

11.8
9.25
8.56
8.29

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.

22.51 mag/arcsec2

Apparent size of NGC 6643

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.
3.32 arcmin
1.63 arcmin
37°

Digitized Sky Survey image of NGC 6643

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 0.5x0.5 degrees (30x30 arcmins).

Image of NGC 6643 - Spiral Galaxy in Draco star
/>
DSS2 image of NGC 6643 in the Red band. The green region on the image is a representation of the major (3.32 arcmin) and minor (1.63 arcmin) axes of the object's apparent size.

NGC 6643 - Spiral Galaxy in Draco 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.

NGC 6643 - Spiral Galaxy in Draco
Visualization of the morphological classification of NGC 6643 - Spiral Galaxy in Draco, Spiral (SAc).
Credits for the background image: Antonio Ciccolella / M. De Leo / CC BY

Celestial coordinates and finder chart of NGC 6643

Celestial coordinates for the J2000 equinox of NGC 6643 are provided in the following table:

18h 19m 45s
+74° 34’ 06”

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°.

Finder chart NGC 6643 - Spiral Galaxy in Draco star
Simplified finder chart for NGC 6643 - Spiral Galaxy in Draco.

Finder chart NGC 6643 - Spiral Galaxy in Draco star
Simplified finder chart for NGC 6643 - Spiral Galaxy in Draco.

Rise ans set times of NGC 6643 from your location

Location: Greenwich, United Kingdom edit_location_alt
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

NGC 6643 - Spiral Galaxy in Draco is circumpolar and transits at 17:27 UTC (altitude: 66.9°)