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trevorw

NGC 6025 and NGC 5460

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Two Southern sky open clusters. Hope you like

Target: NGC 6025 Open Cluster (= Lacaille III.10 = Dunlop 304 = Melotte 139 = Collinder 296), type 'd', in Triangulum Australe Lambda Circinis

Scope: GSO 8?(200mm) F9 CF RC

Mount : Losmandy G11-G2

Camera: QHY 8 OSC CCD

Exposures: 6 frames 10 minutes per frame

Date: 23/4/2012

Time: 7:00 ? 11:00pm

Seeing : Good

Conditions: Cool night no moon usual suburban LP

Guiding: Orion SSAG on 72mm WO Mergz using PHD

Stacking: DSS

Processing: PS CS 3

Right Ascension 16 : 03.7 (h:m)

Declination -60 : 30 (deg:m)

Distance 2.7 (kly)

Visual Brightness 5.1 (mag)

Apparent Dimension 12 (arc min)

Discovered by Nicholas Louis de Lacaille on March 5, 1752. The considerable southern open cluster NGC 6025 was discovered by Nicholas Louis de Lacaille in 1751-1752 from South Africa. About 30 stars of 7th mag and fainter belong to this group. It lies at the boundary to the constellation Norma and has a distance of over 2000 lightyears.

Target: NGC 5460 Open Cluster

Scope: GSO 8?(200mm) F9 CF RC

Mount : Losmandy G11-G2

Camera: QHY 8 OSC CCD

Exposures: 6 frames 10 minutes per frame

Date: 23/4/2012

Time: 7:00 ? 11:00pm

Seeing : Good

Conditions: Cool night no moon usual suburban LP

Guiding: Orion SSAG on 72mm WO Mergz using PHD

Stacking: DSS

Processing: PS CS 3

Position (epoch J2000) Constellation Centaurus

Ra 14:07:27.7 Dec -48:20:33

Apparent mag. 5.6

Size 35 '

Class I 3 m

Historical observations

Dunlop, James (1827)

James Dunlop discovered this open cluster from Paramatta, New South Wales, and included it as No. 431 in his catalogue of 1827. Using a 9-inch f/12 telescope, he described it as "a curiously curved line of small stars, of nearly equal magnitudes; two stars of 7th magnitude following."

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