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[Pease 1] [M15]

Challenge Planetary Nebula - Finder Charts

Pease 1 Page 2: Observation Reports and a Sketch
  1. Pease 1, near the center of the globular cluster M15 in the constellation Pegasus (This page), or
  2. GJJC 1 In Globular Cluster M22 in Sagittarius
The following three images should aid in locating this most challenging planetary nebula. In addition, Dave Jurasevich's recent observation report can be extremely helpful for pinpointing Pease1.

You will need extreme patience, an OIII filter, very dark skies, a 12" telescope at the minimum (clock drive highly recommended), high power eyepieces, and I recommend at least one observing partner to help tackle this one! Once in the area indicated by the blue circle on the lower images, use the OIII filter to blink the field of view and the object that does not greatly diminish in brightness will be the planetary. GOOD LUCK!

I have located a VERY informative web article on Pease1 written by Leos Ondra and am providing a link to it near the bottom of this page. It is entitled `A Golden Planetary' and provides historical and current information on the research of this obscure, but important and interesting planetary nebula.

Click HERE to view a recent Hubble Space Telescope color image of Pease1 and a good part of M15 (Pease1 is the pinkish object at the upper left). Click HERE to view a Close-Up False Color image of Pease1 (Kustner648, K648) from the HST. For additional data & information on these images, please visit this STScI web page. This HST info added on 9/7/00.

Pease 1 Finder Chart 1 of 3


Find the 4 trapezium stars inside the 'box', then proceed to the next finder chart. These stars are only the start of a grand star-hoppin' adventure. In these images, North is up, and West is to the right.

Pease 1 Finder Chart 2 of 3


Use the 4 trapezium stars in the 'box' as starters; first you want to locate star 'D by star-hopping from 'A' to 'B' to 'C' and then to 'D' (green lines). Stars A, B, C, and D have similar magnitudes, although B and C are slightly fainter. Once you have located 'D', then draw an imaginary line between stars 'A' and 'D'. Continue this line through to where star 'E' is (about 20 arc seconds SE). When you have located star 'E', then use Finder Chart 3 which is a modified Hubble image.

Pease 1 Finder Chart 3 of 3


From star 'E' continue the line SE not quite half an arc minute until you can observe a small clump of stars. (I know, everything in the field is a clump of stars!) Notice that of the three stars circled, the PN is the object just slightly to the northwest.
PNe Mag.= 14.9, Surface Brightness = 6, and the angular size of the PN = 1" (arc second).

Compiled by Doug Snyder.

More Pease 1 Information (Leos Ondra)

Hartmut Frommert

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