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RA: 05h 39m 17s
Dec: −17° 50′ 48″
Ch: MSA:326, U2:316, SA:11
Ref: SIMBAD, DAML02, Archinal&Hynes (2003)
Type: open cluster
Mag: B=?, V=?
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The entry in the NGC reads: "cluster of large stars." In fact, this 'cluster' is dominated by the multiple star, h3780, which has at least six components. The stars are of various colours, making it an interesting object. The components, A-F, have the following magnitudes: 6.4, 7.9. 8.5. 9.2. 8.4 and 8.1. The grouping lies at RA 5h 39.4m Dec -17 51' (2000.0)
From the WDS catalogue:
WDS Discovr Comp EPOCH # THETA RHO Magnitudes Spectral PROP. MOT DM Desig No
Identifier Frst Last FST LST First Last Pri Sec Type RA" DEC" te
05393-1751 HJ 3780 AC 1876 1977 12 136 137 89.5 89.2 6.7 8.8 -010 -001 -17 1203 p
05393-1751 HJ 3780 AE 1876 1991 16 6 8 76.2 75.8 6.40 7.77 +016 -002 -17 1200 p
05393-1751 HJ 3780 AF 1876 1991 5 299 299 126.5 133.0 6.40 8.20 -062 +034 -17 1198 p
05393-1751 HJ 3780 AG 1878 1916 2 49 50 60.3 59.6 6.7 9.9
05393-1751 HJ 3780 AH 1877 1877 1 310 310 41.8 41.8 6.7 12.7
05393-1751 HJ 3780 AB-I 1914 1914 2 102 102 89.2 89.2 6.4
05393-1751 HJ 3780 CD 1877 1977 14 0 355 1.5 1.4 8.8 8.21
Discovered by Sir John Herschel at the Cape of Good Hope with an 18-inch f/13 speculum telescope. He recorded it as "a fine clustering group of large stars."
Vorontsov-Velyaminov, B. (1925) "Catalogue of integrated magnitudes of star clusters", Astron. Nach. 226.195. Comparing the brightness of the cluster with the extrafocal images of stars, he estimates the magnitude as 6.01.
The RNGC (Sulentic and Tifft 1973) notes that this is a nonexistent object. Their coded description reads NOCL S.
Hartung notes that this "can hardly be called a cluster" and writes: "This attractive group of apparently six stars, the faintest just visible with 7.5cm, shows different colours, yellow,orange, bluish and ashy. Close examination discloses that the bluish star is a small pair (9.0, 9.7, 1.5 arcsec, 357 deg)_ and that the brightest star is also a close pair (6.8, 8.3, 0.8 arcsec, 149 deg) which 20cm will resolve. These stars seem to form a phyiscal system and ther ehas been little change since Dembowski measured them in 1877."
Steve Coe, observing with a 13" f/5.6, notes: "Six stars, 4 pretty bright, 2 pretty faint, nice asterism."
15cm - attractive grp of four *s w/a few bkgrnd ones. lightly colored yellow,
blue, and orange.
"These five stars have a remarkable appearance and stand out beautifully against the background starfield. With its variety of colours, it can undoubtedly be considered as one of the most beautiful objects. The brightest star, 6.4 magnitude, has an obvious pale-blue colour. To the south, a yellow star accompanied by a smaller one. The star to the north of the primary shows a strong orange colour. In order to complete a triangular shape, there is a considerably fainter, somewhat blue-gray, star. Lies 1.5° east of A Leporis."
[Sketch made, scanned in and submitted.]
The Messier objects
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