NGC 6864 Globular Cluster
RA 20h 07m · Dec -21° 47′
5′

One of the most distant and most concentrated Messier globular clusters. Appears almost stellar at low magnification due to its high central density and remote distance.

Open cluster

NGC 6864 Globular Cluster

M 75 · Sagittarius
These photons are ~68,000 years old
UV/IRUV/IR-cut. Blocks ultraviolet and infrared so refractor optics stay in focus across the visible band.ZWO Seestar S50ZWO Seestar S50Aperture 50mm · Focal length 250mm · f/5 · Apo triplet with ED element · Sony IMX462 colour CMOS sensor (1920 x 1080, 2.1MP)…View equipment →
⧉ 5 versions of this capture — pick one to see its image and log
Date
22/09/2025
Location
36.3857° N, 28.0415° E
Integration
9m (51 × 10s)
Software
ZWO Seestar app
Notes
·
Total effort
41m over 1 night
Moon
🌑New Moon, 0% lit
Plate solve
Centre RA
20h 07m 06.1s
Centre Dec
−21° 46′ 33″
Field
42.7′ × 76.0′
Pixel scale
2.37″/px
Orientation
176.3° E of N
Hemisphere
Southern
Also in this frame
M75

Catalogued objects inside the plate-solved field, nearest the centre first. Highlighted names have their own photo here.

TelescopeZWO Seestar S50
CameraZWO Seestar S50 Camera
RigFamily Holiday Rig

Where to find it

Finder chart
-22°20′-22°10′-22°-21°50′-21°40′-21°30′-21°20′-21°10′20h06m20h07m20h07m20h08m20h09mM 75NE42.7′ x 76.0′5′

Star field and catalogued objects inside the plate-solved field, oriented to the solve. Fully offline, from the bundled star and deep-sky catalogues.

Interactive sky chart centred on 20 07 06.1 -21 46 33. Drag to pan, scroll to zoom, click a star or object to identify it. Zoom in to the plate-solved field for the DSS survey photo; zoom out for constellation figures and neighbouring catalogue objects. Fully self-hosted: the star and deep-sky catalogues and the survey image are all served from this site, so nothing external loads. Imagery: DSS2 colour (STScI / POSS-II). Constellation figures © Dominic Ford (GPLv3).

Captured from · Ρόδος (Rhodes)
36.3857° N, 28.0415° E · view on OpenStreetMap ↗ · Place data © GeoNames (CC BY)

Frequently asked questions

What kind of object is M 75?
M 75 is an open cluster.
Which constellation is M 75 in?
M 75 lies in the constellation Sagittarius.
How far away is M 75?
The light in this image left M 75 roughly ~68,000 years ago, so that is how far back in time you are seeing it.
What are the coordinates of M 75?
M 75 sits at right ascension 20h 07m 06s and declination −21° 46′ 33″ (J2000).
When is the best time to photograph M 75?
M 75 rides highest in the evening sky around July, reaching about 32° above the horizon from around 36°N.
What equipment was used to photograph M 75?
This image of M 75 was captured with ZWO Seestar S50 and ZWO Seestar S50 Camera.
How much exposure time went into this image?
This image of M 75 represents 9m (51 × 10s) + 8m (51 x 10s) of total integration time.

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