When is the best time to observe Caldwell 95?

Caldwell 95 is best observed from April through June, with peak visibility during May when it transits around midnight in the Northern Hemisphere.

Where is Caldwell 95 located in the sky?

Caldwell 95 lies in the constellation Triangulum Australe at right ascension 16h 03m and declination -60° 31′.

What telescope do I need to see Caldwell 95?

At magnitude 5.1, Caldwell 95 is visible to the naked eye from dark skies, easy in any binoculars.

Caldwell 95 — Open Cluster in Triangulum Australe

NGC 6025

Open Cluster Showpiece (78/100)

Magnitude 5.1^m OpenCluster Triangulum Australe Visible

Credit: Legacy Surveys / D.Lang (Perimeter Institute) & Meli thev. License: CC BY 4.0. (Wikimedia Commons)

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About C95

Description

NGC 6025 is an open cluster in Triangulum Australe, about 2,500 light-years away. It contains about 60 stars within 12 arcminutes, with the brightest members at magnitude 7. The cluster has an estimated age of about 160 million years.

Observing Tips

A pleasant cluster for binoculars and small telescopes from the southern hemisphere. Several bright stars form distinctive chains and patterns. Located in the rich southern Milky Way. Best in winter and spring from southern latitudes.

History

Discovered by Nicolas Louis de Lacaille in 1751 from South Africa. It is one of the better open clusters in the small constellation Triangulum Australe.

Fun Facts

NGC 6025 is located near the southern Milky Way and contains a mix of blue-white main-sequence stars and a few evolved orange giants, providing a nice color contrast.

Observe

1Properties

Magnitude 5.1

Angular Size 11.4′

Distance 2,700 ly

Description

Open Cluster [Distance: 2700 ly]

Position & Identifiers

RA 16h 03m 03.4s

Dec -60° 30' 46.8"

Constellation Triangulum Australe

Catalog C95

Also known as NGC 6025

Physical size

8.1 light-years across — about 1.9× the Sun-to-Alpha-Centauri distance

2How easy to spot?

Telescope	Bortle 3	Bortle 4	Bortle 5
80 mm refractor 80mm refr.	Easy	Easy	Easy
150 mm Newton 150mm Newt.	Easy	Easy	Easy
Celestron C8 (203 mm SCT) C8 203mm	Easy	Easy	Easy

Easy Medium Hard Very hard Impossible

Bortle 3 = rural · 4 = outer suburbs · 5 = suburbs

Easy on Seestar S50

At 150mm under B5 skies you should resolve about 96 of 285 members.

3Visibility

Set a location in User Settings to see visibility data.

Best season Apr – Jun (peak: May)

4 Eyepiece View

Telescope Eyepiece

125x TFOV: 0.4° Lim. mag: 13.6

C95 · 11.4′ diameter

5 Best Magnification

6Where this cluster sits in time

Open clusters span more than four orders of magnitude in age — from newborn OB associations to ancient, metal-rich survivors.

7 Colour-Magnitude Diagram

A cluster's colour-magnitude diagram reveals its age: the bluer the turn-off point where the main sequence bends into red giants, the younger the cluster.

Loading member data…

Each point is a Gaia-DR3 member. Colour encodes spectral type; size reflects membership probability.