NGC 6400
DSS image of NGC 6400
Overlaid DSS image of NGC 6400, 30' x 30' with north at top and west to the right

Aladin viewer for the region around NGC 6400
Melotte 177, Mel 177, Collinder 342, Cr 342, Lund 767, C1736-369, C1737-369, OCl 1030

Type  Open Cluster
Magnitude  8.8
Size  12'
Right Ascension  17h 40' 10"  (2000)
Declination  36° 57' 42" S
Constellation  Scorpius
Description  Cl, pL, pRi, iR, *9...10
Classification  II2m
Observing Notes

Andrew Cooper
Aug 7, 2020    Waikoloa, HI (map)
20cm f/6 Newtonian, Cave Astrola @ 76x

A conspicuous cluster in a rich galactic starfield, about 10' across, bright, rich, resolved

Andrew Cooper
Jun 29, 2019    Kaʻohe, Mauna Kea, HI (map)
20cm f/6 Newtonian, Cave Astrola @ 56x

A nice cluster beside the scorpion's tail, 10', rich, resolved, a pretty object for a low power telescope view

Harold Corwin

Here, coincidentally, is the next open cluster in the NGC after NGC 6396 (which see), and another object where John Herschel may have recorded the wrong wire -- his RA for the cluster is 40 seconds too small. In the sweep, he claims wire 2; if he actually observed the cluster leaving the field, his RA would be 17 40 06 for J2000, just six seconds of time off the actual RA.

As with NGC 6396, the cluster is too obvious to misidentify, even if John Herschel's mistake is not due to a wire error. He found this cluster, by the way, on 28 June 1834.
NGC Notes by Harold Corwin
Other Data Sources for NGC 6400
Nearby objects for NGC 6400
Credits...

Drawings, descriptions, and CCD photos are copyright Andrew Cooper unless otherwise noted, no usage without permission.

A complete list of credits and sources can be found on the about page

NGC 6400