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E 3 Cluster
E3 Cluster, E 3, ESO 37-1, C 0921-770
RA: 09h 20m 59.3s
Dec: −77° 16′ 57″
Con: Chamaeleon
Ch: MSA:1025, U2:465, SA:25
Ref: SIMBAD, Archinal&Hynes (2003), SEDS
Type: globular cluster
Mag: B=?, V=11.4
Size: 10′
PA: ?
Published comments
Harris (1997)
RA 09 20 59.3 (2000) Dec -77 16 57 Integrated V magnitude 11.35 Central surface brightness, V magnitudes per square arcsecond 23.10 Integrated spectral type Central concentration, c = log(r_total/r_core); a 'c' denotes a core-collapsed cluster .75 Core radius in arcmin 1.87. ["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
From: 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: 6.5 (Limiting magnitude) Seeing: 7 (1-10 Seeing Scale (10 best)) Moon presence: None - moon not in sky Instrument: 20" f5 Dobsonian Magnification: 160-300 Filter(s): none Object(s): E3 Category: Globular cluster. Class: Constellation: Chameleon Data: mag ? size ? Position: RA 9:20.59 DEC -77:17
Description: E3 is a very faint globular cluster, It appears as a 3' diffuse patch of sky just brighter than the background sky. I first located the globular with averted vision using a chart printed from mega star. Once found I was able to hold the cluster with direct vision. There was no central condensation and it did not resolve at all. No stars were superimposed over the cluster either. The cluster had an even surface brightness all be it quite low. The edges of the cluster were difuse due to its low surface brightness.
--
Contemporary observations
Magda Streicher
14 June 2009
GLOBULAR CLUSTER
RA: 09h21m00s - DEC: -77o17' - Magnitude: 11.3 - Size: 5'
Tel: 12" S/C - 218 - 346x - Date: 14 June 2009 – Vis: 5.4
The object under discussion looks quite different from the rest of the star field. However with high power it could be seen as just two faint stars on top of one another?
Auke Slotegraaf
1998-03-01
1998-03-01/02, 6-inch f/8.6 Newtonian, Die Boord. 5.6 (naked eye), seeing average.
Nothing seen (42x, 72, 144x). Position readily found in a convenient field.
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Favourite lists
Lacaille's catalogue
The Messier objects
Dunlop's catalogue
The Bennett objects
The Caldwell list
Named DSOs
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