NGC 6934, also known as Caldwell 47, is a 9th magnitude globular cluster located in Delphinus. Backyard scopes show a fuzzy disk of nebulosity, about 5 arc minutes in diameter with a brighter core. The globular is not visually spectacular, but that's due to distance and not intrinsic brightness. At 50,000 light-years, it's one of the more remote globulars easily seen with amateur scopes.

William Herschel discovered NGC 6394 on September 24, 1785. He classified it as a "bright nebula" but wasn't able to resolve any stars.

The cluster is best seen during the months of July, August and September. It has a spatial diameter of 120 light-years and is estimated to contain about 250,000 stars. It's believed to be around 10 billion years old.

NGC 6934 (credit:- NASA, ESA, and The Hubble Heritage Team (STScI/AURA))

Finder Chart for NGC 6934 (credit:- freestarcharts)

Finder Chart for NGC 6934 - pdf format (credit:- freestarcharts)

NGC 6934 is located 4 degrees south of Epsilon Delphini (mag. +4.0) and 1 degree northwest of a pair of 6th and 7th magnitude stars. The globular is a difficult binocular object, ideally requiring dark skies. A small 80mm (3.1-inch) refractor shows a faint, clearly non-stellar circular patch of light. Just to the west of the cluster is a 9th mag. star.

NGC 6934 can be partially resolved with a 300mm (12-inch) telescope. At about 200x magnification dozens of stars are revealed, especially on nights of good seeing. The cluster appears compressed and grainy. A very large 450mm (18-inch) scope at high powers will resolve some of the stars at the core. Photographically, NGC 6934 spans some 8.4 arc minutes across but visually it appears a few arc minutes less.

In Delphinus there is an even more distant globular, NGC 7006. It's located about 10 degrees to the northeast of NGC 6934 and at 135,000 light-years, is nearly three times further away.

NGC 6934 Data Table

NGC6934
Caldwell47
Object TypeGlobular Cluster
ConstellationDelphinus
Distance (light-years)50,000
Apparent Mag.+8.9
RA (J2000)20h 34m 11s
DEC (J2000)+07d 24m 16s
Apparent Size (arc mins)8.4
Radius (light-years)60
Age (years)10 Billion
Number of Stars250,000

Sky Highlights - February 2017

Comets
Comet Encke (2P/Encke) now visible in the western sky during evening twilight
Now is the last good chance to see comet 45P/Honda-Mrkos-Pajdusakova before it dramatically fades

Conjunction
Mars passes less than 1 degree north of Uranus on February 27th

Minor Planet
Vesta now visible with binoculars and small telescopes.

The Planets
This Month's Guide

Algol Minima
Algol eclipse dates and times for February 2017

Northern Hemisphere
Evening
Southwest:- Venus (mag. -4.8), Mars (mag. +1.1 to +1.3), Uranus (mag. +5.9)
Midnight
East:- Jupiter (mag. -2.1 to -2.3)
Morning
South:- Jupiter
Southeast:- Saturn (mag. +0.6)

Southern Hemisphere
Evening
West:- Venus, Mars, Uranus
Midnight
East:- Jupiter
Morning
North:- Jupiter
East:- Saturn, Mercury (mag. -0.2 - first half of month)

Deep Sky
Naked eye / binoculars:-
Messier 45 - M45 - The Pleiades (Open Cluster)
The Hyades - Open Cluster
Messier 44 - M44 - The Praesepe (Open Cluster)
Messier 35 - M35 - Open Cluster
Messier 42 - M42 - The Great Orion Nebula (Emission/Reflection)

Small telescopes:-
Messier 36 - M36 - Open Cluster
Messier 37 - M37 - Open Cluster
Messier 38 - M38 - Open Cluster

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