|
Class | Description |
---|---|
I | High concentration of stars towards the center (M75) |
II | Dense central concentration of core stars (M80) |
III | Strong inner concentration of core stars (M54) |
IV | Intermediately rich concentration of core stars (M15) |
V | Intermediate concentration of core stars (M13) |
VI | Intermediately mild concentration of core stars (M3) |
VII | Intermediately loose concentration of core stars (M22) |
VIII | Rather loose concentration of core stars (M14) |
IX | Loose concentration of core stars (M12) |
X | Very loose concentration of core stars (M68) |
XI | Almost no concentration of core stars (M55) |
XII | No concentration of core stars (Palomar 12) |
AL#49 (M79) NGC1904
AL#67 M3 (NGC5272)
Includes a sketch of the star field where the cluster is located and another sketch showing the cluster in the eyepiece.
This is a challenge object where the AL program guide says magnitude 9.9, SkySafari says magnitude 10.3 and Wikipedia says magnitude 10.7. At 85x I can barely see the cluster as a dim fuzzy patch and made a sketch showing the cluster in its star field. At 145x and the view was pretty much the same with no new detail noted. At 203x the fuzzy patch seemed to be elongated and I made a detailed sketch. There was some brightness near the bottom (South West) of the cluster - which seemed to come and go due to seeing. Overall, the cluster was fairly nebulous almost like an elliptical galaxy - I could not resolve any individual stars. The brightness I observed seemed to be about a third of the width of the fuzzy patch. Based on the comparison pictures of the program guide and descriptions I thought it matched "Class IV - Intermediately rich concentration of core stars" and I estimated this to be a class IV cluster since the brightness appeared to be pretty concentrated. |
Starfield sketch at 85x (using my 24mm ES68 eyepiece) showing where the cluster is located
Cluster detail sketch at 203x (using my Delos 10mm eyepiece)
AL#64 M53 (NGC5024)
AL#77 NGC5904 M5
AL#92 M13 (NGC6205)
AL#106 M92 (NGC 6341)
Observed from Chippokes State Park during the Back Bay Amateur Astronomer's Spring East Coast Star Party. M92 although smaller than M13 it is pretty close in apperance to M13 so I spent some time going back and forth between the two. At 85x the cluster is located in a very nice field of stars and is quite beautiful with many stars resolved. I can resolve stars across the face of the cluster except at the very center. Appears uniformly round, no noticable dark lanes. At 203x it is still beautiful although tonight I am not getting that 3D sensation I sometimes get from it and M13. |
AL#94 M12 (NGC 6218)
AL#85 M4 (NGC 6121)
AL#84 M80 (NGC 6093)
AL#173 M56 (NGC 6779)
AL#90 M107 (NGC 6171)
AL#96 M10 (NGC 6254)
AL#111 M10 (NGC 6356)
AL#163 M22 (NGC 6656)
AL#99 M62 (NGC 6266)
AL#100 M19 (NGC 6273)
AL#185 M15 (NGC 7078)
AL#186 M2 (NGC 7089)
AL#125 M14 (NGC 6402)
AL#147 NGC 6544
AL#108 M9 (NGC 6333)
AL#158 M28 (NGC 6626)
AL#157 NGC 6624
AL#159 M59 (NGC 6637)
AL#187 M30 (NGC 7099)
AL#132 NGC 6441
AL#165 M70 (NGC 6681)
AL#167 M54 (NGC 6715)
AL#177 M55 (NGC 6809)
AL#182 NGC 6934
AL#180 M71 (NGC 6838)
AL#181 M75 (NGC 6864)
AL#166 NGC 6712
AL#169 NGC 6723
AL#162 NGC 6652
AL#33 NGC 288
AL#155 NGC 6569
AL#183 NGC 6981 (M72)
AL#148 NGC 6541
AL#149 NGC 6553
AL#141 NGC 6522
AL#48 NGC 1851, C73
AL#70 M78 NGC 4590
AL#74 NGC 5824
AL#81 NGC 5986
AL#101 NGC 6284
AL#103 NGC 6293
AL#104 NGC 6304
AL#105 NGC 6316
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