Basic object information
Name: M 7
Type of object: Open cluster
Magnitude: 3.3
Size: 80.0'
Number of stars: 80
Magnitude of brightest star: 5.6
Object classification: II 2 r
Description: Cl,vB,pRi,lC,*7...12
Notes: 80 members to 10th mag,Fine naked eye cluster

Catalog position for epoch J2000.0
Right ascension: 17h 53m 54.0s
Declination: -34 49' 00"

Constellation: Scorpius

Observer: Iiro Sairanen
Obs. place: Boca de Tauce (1980m above sea level), Tenerife, Spain
Date/Time: 16/17.4.2004 3:05


Telescope: Newton 110/805mm

Magn: 25x

Filter:

Field: 120'

NE Lim.mag: 6,9

Background sky: 2

Seeing: 3

Height: 13
Visuality: I

Weather: +2C, moist

Very rich and beatiful open cluster in very rich field. Several strars are brighter than 10 mag. Quite uncomfortable to draw because of numerous stars. 25x gives the best view and whole object fits in the field.

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