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In Evidence

New Comet C/2025 J1 (Borisov) Discovered in May 2025
Detailed information about the discovery of Comet C/2025 J1 (Borisov) and pointers to useful resources to track and observe it. Read more...

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

NGC 6644 - Planetary Nebula in Sagittarius

Above the horizon.  Rise: 0:11 | Tran: 3:49 | Set: 7:24
Alt: 13.29°   Az: 184.58°   Direction: South

NGC 6644 is a Planetary Nebula in the Sagittarius constellation. NGC 6644 is situated south of the celestial equator and, as such, it is more easily visible from the southern hemisphere. Given its visual magnitude of 10.7, NGC 6644 is visible with the help of a telescope having an aperture of 6 inches (150mm) or more.

The image below is a photograph of NGC 6644 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).

Image of NGC 6644 - Planetary Nebula in Sagittarius star
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DSS2 image of NGC 6644 in the Red band. The green region on the image is a representation of the major (0.04 arcmin) and minor (0.04 arcmin) axes of the object's apparent size.

Celestial Coordinates

Apparent

18h 34m 08s
-25° 06’ 32”
00h 19m 41s
18h 53m 50s

J2000

18h 32m 35s
-25° 07’ 45”

Finder Chart

The simplified sky charts below show the position of NGC 6644 in the sky. The first chart has a field of view of 60° while the second one has a field of view of 10°.

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Finder chart for NGC 6644 - Planetary Nebula in Sagittarius.

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Finder chart for NGC 6644 - Planetary Nebula in Sagittarius.

Photometric Information

The following table lists the magnitude of NGC 6644 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).

12.2
10.7
11.56
11.6
10.63

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

Apparent Size

The following table reports NGC 6644 apparent angular size. The green area displayed on top of the DSS2 image of NGC 6644 is a visual representation of it.
0.04 arcmin
0.04 arcmin

Rise and Set Times

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

Today's NGC 6644 - Planetary Nebula in Sagittarius rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 115.1°
Max altitude: 13.4°
Azimuth: 244.9°