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Cl Ruprecht 18 (4,606 of 18,816)


oc gc pln bn dn gx gxcl ast aka lost




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Cl Ruprecht 18

Cl Ruprecht 18, C 0722-261, Ocl 646

RA: 07h 24m 39s
Dec: −26° 11′ 18″

Con: Canis Major
Ch: MSA:344, U2:319, SA:19

Ref: SIMBAD, DAML02, Archinal&Hynes (2003)

(reference key)

Type: open cluster, 31m

Mag: B=9.9, V=9.4

Size: 7′
PA: ?

Published comments

Moffat, AFJ & Vogt. N. (1975)

Moffat, AFJ & Vogt. N. (1975) "Southern Open Star Clusters IV. UBV-H-beta Photometry of 26 Clusters from Monoceros to Vela." Astron.Astrophys.Suppl., 20, 85-124. [image, table]

"This cluster was included in our program because of its coincidence with the Cepheid AO CMa. Although the POSS charts show that Ru 18 may represent a random window amongst dust clouds, many of the observed stars appear to form a possible group of stars with .. d = 1.03kpc."

Modern observations

Brian Skiff


25cm - pretty nice cl ~5' diam. unconcen grp of 25 *s @ 95x. brtr m10.5 * on SW edge. cl *s mostly m11.5+. fntr version of sparse wintertime cl. BS, 25Jan1982, Anderson Mesa.

Contemporary observations

Magda Streicher

2006 November 20


16-inch f/10 SCT (127x, 290x)

It is hard to say what is going on in this very busy field of view. Although I more or less consentrate on a splash of faint stars sharing close together a 8' piece of space. Towards the middle area three stars in a string. The field of view towards the west seems more busy with faint stars in a north to south direction.

Richard Ford

2013 February 8th, Friday

Location:Blesfontein Guest Farm,Sutherland.


Sky Conditions:The most crystal clear sky possible.Dark moon and stars magnitude 6 and fainter are visible with the naked eye.Excellent clean sky,limited star flickering and brilliant objects.

Instrument:12-inch Dobsonian.

This open cluster looks like a misty nebulous glow against a starry field and that most of the stars in this cluster is nearly as bright as each other.This cluster is compact and not at all separated and that most of the stars are in the magnitude range of 11.6 to 11.8.This open cluster measures 4.7'x 3.3'.Chart No.98,NSOG Vol.1.

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