NGC 752 is a large spawling open cluster in the constellation of Andromeda. With an apparent magnitude of +5.7, it's visible to the naked eye from a dark site appearing as a large unresolved fuzzy patch of light. The cluster is one of the finest large open clusters in the sky and contains over 70 stars spread across a huge 1.25 degrees of apparent sky. Due to its size, NGC 752 is best observed with binoculars or through wide field telescopes at low powers.

NGC 752 is located 5 degrees south and slightly west of outstanding double star Almach (γ And - mag. +2.1) the third brightest star in the constellation. It was discovered by Caroline Herschel on September 29, 1783 although it was probably observed sometime before 1654 by Italian astronomer Giovanni Battista Hodierna. Caroline's brother William Herschel subsequently added it to his catalogue a couple of years later. It's best seen from northern latitudes during the months of October, November and December. The cluster is number 28 in the Caldwell catalogue.

NGC 752 - Open Cluster (Alson Wong - www.alsonwongastro.com)

Finder Chart for NGC 752

Finder Chart for NGC 752 - pdf format

NGC 752 is a delightful open cluster when seen through binoculars, small or wide field telescopes. Through popular 7x50 or 10x50 models it appears large and hazy with the brightest dozen stars resolvable. An 80mm (3.1-inch) scope at low powers reveals approx. 60 mainly white stars. However, even with a wide field eyepiece it doesn't take much magnification before the cluster overfills the field of view. When seen through medium size scopes such as a 150mm (6-inch) instrument, NGC 752 is a wonderful site with a myriad of stars visible, some that are colourful.

In total, NGC 752 contains about 60 stars brighter than 9th magnitude. It's located 1,300 light-years distant and has an age of 2 billion light-years.

NGC 752 Data Table

NGC752
Caldwell28
Object TypeOpen Cluster
ConstellationAndromeda
Distance (kly)1,300
Apparent Mag.+5.7
RA (J2000)01h 57m 48s
DEC (J2000)37h 51m 00s
Apparent Size (arcmins)75 x 75
Radius (light-years)14
Age (years)2 Billion
Number of Stars>70
Other Name (s)Collinder 23

Sky Highlights - March 2017

Comet
Comet 41P/Tuttle-Giacobini-Kresak now visible with binoculars as it heads towards perihelion

Mercury
Mercury heading towards greatest elongation east

Minor Planet
Vesta now visible with binoculars and small telescopes.

The Planets
This Month's Guide

Algol Minima
Algol eclipse dates and times for March 2017

Northern Hemisphere
Evening
West:- Venus (mag. -4.8 to -4.1 - first half of month), Mars (mag. +1.3 to +1.5), Uranus (mag. +5.9), Mercury (mag. -1.5 to -0.4 - second half of month)
Midnight
Southeast:- Jupiter (mag. -2.3 to -2.5)
Morning
Southwest:- Jupiter
Southeast:- Saturn (mag. +0.5)

Southern Hemisphere
Evening
West:- Venus (first half of month), Mars, Uranus
Midnight
North:- Jupiter
East:- Saturn
Morning
West:- Jupiter
Northeast:- Saturn
East:- Neptune (mag. +8.0 - second half of month)

Deep Sky
Naked eye / binoculars:-
Melotte 111 - Mel 111 - The Coma Star Cluster (Open Cluster)
Messier 44 - M44 - The Praesepe (Open Cluster)

Telescopes:-
Messier 67 - M67 - Open Cluster
Messier 51 - M51 - The Whirlpool Galaxy (Spiral Galaxy)
Messier 97 - M97 - The Owl Nebula (Planetary Nebula)
Messier 101 - M101 - The Pinwheel Galaxy (Spiral Galaxy)
Messier 65 – M65 – Spiral Galaxy
Messier 66 - M66 - Intermediate Spiral Galaxy
Messier 95 - M95 - Barred Spiral Galaxy
Messier 96 - M96 - Intermediate Spiral Galaxy
NGC 4244 - Spiral Galaxy
NGC 4565 - Needle Galaxy - Spiral Galaxy

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