Barnard 142 and 143 in Aquila
IC 4665 in Ophiuchus
Faint Galaxies in Pegasus
by Susan Delaney Looking up in the evening and seeing the Great Square of Pegasus is a sure sign that Autumn has arrived. Although the Winged Horse contains only a few bright observing targets - the beautiful globular cluster, Messier 15, and the bright spiral galaxy, NGC 7331 - it is very rich in faint, small galaxies. If you have a moderate to large scope, you may find the region around NGC 7331 a very interesting and challenging observing target. Not only does NGC 7331 have four faint companion galaxies lying to the East, Stephan’s Quintet lies a half-degree to the South. Four galaxies in Pegasus are on the Herschel 400 observing list. I observed them in my 10” f/5.6 Dobsonian: NGC 7217 PEG Gx mv11 3.8'X3.3'
Bright and large with a diffuse halo extended E-W. The core is fairly round and brightens towards the center where it is nearly stellar at 158x. There is a bright field star to the E. NGC 7331 PEG Gx mv10.4 11.4'X4.0'
At 158x, the core is bright with a stellar nucleus and an extensive halo stretching in a N-S orientation. Two bright stars are located to the East. NGC 7448 PEG Gx mv12 2.7'X1.1'
Appears pretty faint, diffuse, and oval of fairly even surface brightness at 158x. NGC 7479 PEG Gx mv11.7 4.4'X3.4'
At 158x, this barred spiral appeared diffuse, faint, and of fairly even surface brightness. It’s elongation was oriented in a N-S position.
by Susan Delaney Date/Time: 2004.08.08 21:30 EDT / 0230-0430 UT
Observer: Susan Delaney
Location: 41N -73W, elev: 800', rural
Seeing: Bortle Class 3, Antoniadi II, Transparency: 6/10 (10 best)
Telescope: 10" f/5.6 Dobsonian
Eyepieces: 22mm Nagler IV (64x), 9mm Nagler (158x) We had been exploring Mohawk Mountain in northwestern Connecticut. It rises 1683 feet to provide scenic views of the Catskill, Taconic, and Berkshire ranges to the north and the west. At the lookout, just a few feet North of the large white circle that marks the four directions, we saw wild blueberries growing amid the glacial rocks. As we watched a hawk circling nearby, my thoughts turned towards the clouds, wishing they would disappear by nightfall. As we headed home, we commented on how some of the leaves at the top of an occasional sugar maple tree were already changing color from green to orange, red, and yellow. Lately, it has felt more like Autumn than Summer during our backyard observing sessions up here in the Litchfield Hills area. Temperatures dipped into the 50's F and the sky was clear so Tom and I prepared for a night of deep-sky observing. He continued with his Messier project and I tracked down objects on the Herschel 400 observing list. Following are my observations of a few open clusters in Lacerta: NGC 7209 LAC OC m6.7 25.0'
At 64x, this cluster was large, bright, irregular shaped, moderately compressed and fairly well detached from the surrounding star field. Although many of the brighter stars caught my attention first, there are numerous fainter members populating this cluster too. I counted 40+ stars forming star chains, circlets, with a few dark regions interspersed through the cluster rendering it interesting to explore. There is a bright yellow star located to the northwest. NGC 7243 LAC OC m6.4 21.0'
Large, bright, irregular shaped, poorly compressed, and not well detached from the surrounding star field at 64x. I counted 20-25 stars of fairly similar magnitude: the majority are bright with only a few fainter stars. NGC 7296 LAC OC m9.7 4.0'
At 64x, bright, small, detached, and poorly condensed. I counted a dozen star with the cluster members varying in range of magnitude. There is a bright yellow star to east.
September 2002 Issue
Barnard 142 and 143
by Susan Delaney These two dark nebulae are located in Aquila about 2 degrees northeast of Altair and 1½ degrees west of Gamma Aquilae. They are also known as Barnard's E nebula because when viewed together in the same field of view, they resemble the letter E. Observed at 35x and 64x in a 10" telescope, B142 is a fairly straight dark lane that is positioned in an east-west orientation. Located to its north, B143 is an angular C shape with its two narrow dark lanes protruding westward. Both nebulae lie in a densely populated star field of the Summer Milky Way and may give the impression that the star field they are obscuring is devoid of stars. What lies behind these dark clouds of interstellar dust? B142-3 are best viewed at low power with a telescope. They can also be observed with binoculars from a dark site. Barnard 142: RA 19 33 45, Dec. +10 14, diam. 40'
Barnard 143: RA 19 35 30, Dec. +10 43 diam 30'
SA2000 chart 16
August 2002 Issue
by Susan Delaney Located at RA 17 46.3, Dec +05 43 in the constellation Ophiuchus, IC 4665 is a short 1 1/2° hop from Beta Ophiuchi. Discovered by the Swiss astronomer Philippe Loys de Chéseaux, it has a total visual magnitude of 4.2, is 41' in size, and is located 1,400 light years away. This large, bright cluster contains an asterism forming the word "HI". In a 9x50 finderscope and at 25x in a 4" Dobsonian, the HI asterism was readily apparent. This was more difficult to discern at 35x with a wide field 40mm eyepiece in a 10" Dobsonian. The larger scope revealed 2 dozen stars that were fairly evenly scattered and well detached from the surrounding field. At first glance, I noticed rows and columns of stars intersecting one another. As my eyes adapted, I eventually began to see the H asterism with a line of 3 stars forming the letter I nearby. The asterism was lost at higher powers. This is a fine object in binoculars, finders, and telescopes at low power in a wide field view.
July 2002 Issue
PK 64+5.1 Campbell's Hydrogen Star
by Susan Delaney Campbell's Hydrogen star, PK64+5.1, is located in Cygnus. It is magnitude 9.6 and appears as a starlike planetary nebulae. It is a starhop from Albireo. It is a challenging object because of its location in a densely populated area of the beautiful summer Milky Way. You may find this object interesting because of its reddish color. According to the observing reports below, you will need to use high power to observe this object. Have you observed this object? What did you see? Perhaps you will join me in observing this object during the upcoming months!