Cl Lynga 7

Published comments

Harris (1997)

RA 16 11 03.0 (2000) Dec -55 18 52 Integrated V magnitude Central surface brightness, V magnitudes per square arcsecond Integrated spectral type Central concentration, c = log(r_total/r_core); a 'c' denotes a core-collapsed cluster Core radius in arcmin . ["Catalog Of Parameters For Milky Way Globular Clusters", compiled by William E. Harris, McMaster University. (Revised: May 15, 1997; from http://www.physics.mcmaster.ca/Globular.html; Harris, W.E. 1996, AJ, 112, 1487) ]

Modern observations

Andrew Murrell

Observer: Andrew Murrell Your skills: Advanced (many years) Date/time of observation: Location of site: Ilford NSW Australia (Lat , Elev ) Site classification: Rural Sky darkness: (Limiting magnitude) Seeing: (1-10 Seeing Scale (10 best)) Moon presence: None - moon not in sky Instrument: 20" f5 dobsonian Magnification: 160-700 Filter(s): none Object(s): Lynga 7 Category: Globular cluster. Class: Constellation: nor Data: mag ? size ? Position: RA 16:11.03 DEC -55:18.52

Description: Lynga 7 is a 3' cluster in a starstuded field. This packed field presents a minor dificulty in finding the cluster. It has a low surface brightness and appears to be oval in shape. The cluster seems to be partly resolved through Hector(20" scope) with the brightest stars at about 15.5 magnitude. Several 13th magnitude stars surround the cluster. The brightest of the resolved stars appear to trace two parrell lines across the middle of the cluster. The cluster was visible with the 14" apature mask. A star of 11th magnitude is positioned 2.5' northwest of the clusters edge.

Andrew Murrell

Lynga 7 Observed May 15th 1999

Lynga 7 appeared as a 3' diameter hazy patch in a busy field. The crowding of stars in the field presents some difficulty in locating the Globular as it has a very low surface brightness. The cluster appears distinctly oval in shape. Hector seem to partially resolve the cluster, with the brightest stars at about 15th magnitude. Several 13th magnitude stars surround the cluster. The stars that do resolve appear to trace a pair of parralel lines across the middle of the object. A star of 11th magnitude is positioned about 2.5' northwest of the cluster. This star distracts you from first seeing the cluster. The cluster was still visible with direct vision when the 14" mask was used. The cluster should be able to be observed with smaller telescopes.

Clear skies

Andrew Murrell

------------------------------------------------------------------------

Barbara Wilson

Date: Tue, 06 Jul 1999 16:33:29 -0400

[Apologies again, Barbara - here's another log stolen from your excellent Discussion-list posts! This time, a non-log - maybe of interest to Northern observers who might try for this object? -Lew]

Observer: Barbara Wilson

Your skills: Advanced (many years)

Date/time of observation: 7-4-97 at 10:47 pm

Site classification: Rural

Sky darkness: 7? (Limiting magnitude)

Moon presence: None - moon not in sky

Instrument: 20" f/4

Filter(s): none

Object(s): Lynga 7

Category: Globular cluster.

Class:

Constellation: nor

Data: mag ? size ?

Position: RA 16:11.03 DEC -55:18.52

Description:

Wow Andrew, so you got Lynga 7!!

I attempted it on 7-4-97 at 10:47 pm just as it transited my

location, using a computer for the transit time (10:44 pm CDT)

I looked at its exact location 3 times, and saw nothing.

Barbara Wilson

Contemporary observations

Magda Streicher

25 April 2009

OPEN CLUSTER

RA: 16h11m00s - DEC: -55o21'22" - Magnitude: 10.7 - Size: 2.2'

Tel: 16" S/C 290x - Date: 25 April 2009 – Polokwane – Vis 5

Small in size need high power to enjoy this grouping which is difficult to concern around the field stars. A small knot of stars just south of a nice string of four stars show the way. Not quite sure which one of the two is actually the grouping in discussion.