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ATMoB "Globular Cluster Observing Award " Guidelines
Purpose: To promote observing among the membership of the Amateur Telescope Makers of Boston through participation in the Globular Cluster Observing Awards program. Introduction: This awards program is oriented towards visually observing globular clusters above magnitude 10.9. (See Neil Fleming if you have interest in a more comprehensive list.) There are three levels of awards; Beginner, Intermediate, and Master. See "Challenge Levels " below for details. Rules: 1. Participant must be a current member of the Amateur Telescope Makers of Boston. 2. Observing may be done from any location. Not confined to the ATMoB Clubhouse. 3. For each object observed, fill in the information on the attached spreadsheet in the yellow boxes, and include the required number of sketches. 4. To qualify for your Observing Award Certificate, turn in your Messier checklist to an ATMoB Observing Committee member. Be sure to include your name as you want it to appear on the certificate. 5. The most important rule ­ HAVE FUN! After all, it's a friendly competition. 6. Forward completed information and sketches to a member of the ATMoB Observing Committee or . What · Any man · Star You Need: observing tool - binocular or telescope of any size: The use of the Star-hop method to locate each object is recommended, but not datory. Atlas or finder charts There are a total of 61 globular clusters in our list, going down to magnitude 10.9. Observe and record information on 10 globular clusters in the attached worksheet. Do a rough sketch of 8 of those observations, including apparent cluster outline and other brighter stars in the field of view. Observe and record information on 25 globular clusters in the attached worksheet. Do a rough sketch of 15 of those observations, including apparent cluster outline and other brighter stars in the field of view. Observe and record information on 50 globular clusters in the attached worksheet. Do a rough sketch of 30 of those observations, including apparent cluster outline and other brighter stars in the field of view.

Challenge Levels: Beginner

Intermediate

Master

Information on Classifications:
Antoniadi Scale Seeing Classifications: I. Perfect seeing, without a quiver. II. Slight quivering of the image with moments of calm lasting several seconds. III. Moderate seeing with larger air tremors that blur the image. IV. Poor seeing, constant troublesome undulations of the image. V. Very bad seeing, hardly stable enough to allow a rough sketch to be made. It turns out that a very unprejudiced and convenient method to dermine the limiting magnitude is to count the number of visible stars in certain areas on the sky. There are 27 regions all over both the northern and southern hemisphere. The more stars you can see the fainter is the limiting magnitude. · Use 2 or 3 areas where you determine the star numbers, the choice of the areas may change during the night. · Average the limiting magnitudes of these areas to obtain a mean limiting magnitude. · Determine the star numbers about every half to three-quarters of an hour. · Do not use areas being very low at the horizon (<40° elevation), neither it is recommended to observe there at all. · Different observers will have different limiting magnitudes; every observer should determine his own limiting magnitude. · An accuracy of +-0.5m of the limiting magnitude is not sufficient for a serious analysis of your data. See this link for further details, limiting magnitude charts, and star count tables: http://www.imo.net/visual/major/observation/lm Proof Point Information: Shapley-Sawyer Classification: Reference: http://x.astrogeek.org/articles/article.php?article_id=15 Brief Description: I - High concentration toward the center; E.g., NGC 6864, M75 II - Dense central condensation; E.g., NGC 7089, M2 III - Strong inner core of stars; E.g., NGC 6715, M54 IV - Intermediate rich concentrations; E.g., NGC 7078, M15 V - Intermediate concentrations; E.g., NGC 7099, M30 VI - Intermediate; E.g., NGC 5272, M3 VII - Intermediate; E.g., NGC 6656, M22 VIII - Rather loosely concentrated towards the center; E.g., NGC 6402, M14 IX - Loose towards the center; E.g., NGC 6218, M12 X - Loose; E.g., NGC 4590, M68 XI - Very loose towards the center; E.g., NGC 6809, M55 XII - Almost no concentration towards the center; E.g., NGC 5466

Limiting Magnitude Assessment: