[AZ-Observing] Archinal 1
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- Date: Mon, 7 Jul 2014 17:49:26 -0400 (EDT)
Let's see if this works!
I took a look in the Archinal and Hynes book 'Star Clusters'
(Willmann-Bell, Inc., 2003) and found a description of the cluster as provided
by
Archinal:
"ARCHINAL 1: This likely cluster is listed here for the first time, having
been discovered by one of us, see Figure 4.4 on page 113. It was found
rather serendipitously while investigating the identity of Graff 1 (= IC 4756)
nearby. When Collinder [1931] gave the reference for the Graff discovery
paper [Graff 1922], he incorrectly gave the position (in the paper title) as
"18h 50m +5º.5." Assuming this was a 1900.0 position (it turns out it was
actually an 1855.0 position) the updated position for 2000.0 (18h 55m
+05º.6) was examined on the DSS and a star cluster found there. Later, after
checking the correct position in a copy of the actual Graff paper, it was
realized that this was a previously uncataloged star cluster, and therefore, a
new discovery.
The cluster itself contains about 24 stars in an area 1.5' in
diameter. There are 4 GSC stars included, the brightest of which is GSC
00457-00629 at magnitude 13.4. The center of the group was taken to be the
northern
component of GSC 0457-00615 The other two GSC stars are 0457-00095 and
0457-00642. The estimated Trumpler type is II2p. A histogram equalization
display of the DSS image in the area shows a possible Milky Way star cloud (or
large patch of bright nebulosity?) in an approximately 8' diameter area just
to the west of the cluster.
No check of the colors or proper motion of these stars has been made,
so their existence as a cluster has yet to be proven. However, the
appearance in the DSS is more 'cluster-like' than many other groups cataloged
as
star clusters."
Searching for the first GSC star on SkyMap Pro took me right to the 3
brightest GSC stars, and a look at the DSS photograph confirmed a small
cluster
at that location.
Hope that helps.
Richard Larimer
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