Sky and Telescope - November 2015 - 53

OBSERVING

Alan Whitman

Going Deep

Fresh Eyes

NGC 695

A visit to the 1 Arietis region
after eye surgery gives a new
look to old objects.

NGC 697

1 Arietis

IC 1730

NGC 694

NGC 678

NGC 680
IC 167

GSC 01212 00409

GSC 01212 00301

ALSON WONG

NGC 691

When working through the Herschel 2500 list of
deep-sky objects discovered by William Herschel
between 1783 and 1802, the observer occasionally experiences a pleasant surprise, such as an extreme edge-on
galaxy or a tight clump of galaxies. The H2500 is a
project that has kept me employed for years and always
provides an answer to the perennial question: "What
new object can I see tonight?" The question took on
new meaning after my recent cataract surgery.
Once or twice a year I come upon a pleasing field
of galaxies that I want to share with other observers.
In the 50′ field surrounding 1 Arietis there are five
fairly easy NGC galaxies, most or all of them associated
members of the NGC 697 group. Together with four
fainter galaxies and the three double stars in that field,
the group provides a pleasant evening of observing, or
in my case, re-observing with fresh eyes.
Our starting point is the colorful double star 1 Arietis (Struve 174), an attractive 2.8″ pair with magnitudes of 6.2 and 7.2. The component stars are typically
described as orange (K1III type) and light blue (A6V
type), but after cataract surgery my color perception
changed and I now see the duo as deep yellow and
green instead.
I observed the galaxies of the NGC 697 group
with my backyard observatory's 16-inch equatorially
mounted f/4.5 Newtonian at 203×. This is my most
commonly used power for viewing galaxies with this
telescope - it yields an exit pupil of 2 mm.
Magnitude-12.8 NGC 697 is the largest and thirdbrightest galaxy in the group. Located 17′ east-northeast
of 1 Arietis, the barred spiral is elongated 5:1. Its core is
also elongated and very, very gradually brightens to the
center. A quarter degree farther north, the disturbed
face-on spiral NGC 695 appears very small and round;
Astronomers class NGC 697 and six additional galaxies -
NGC 678, NGC 680, NGC 691, NGC 694, IC 167, and IC 163 (not
shown) - as a group based on their relative proximity, radial
velocities, and separation from other galaxies in space.

Sk yandTelescope.com November 2015

53



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Sky and Telescope - November 2015

Table of Contents for the Digital Edition of Sky and Telescope - November 2015

Contents
Sky and Telescope - November 2015 - Cover1
Sky and Telescope - November 2015 - Cover2
Sky and Telescope - November 2015 - 1
Sky and Telescope - November 2015 - Contents
Sky and Telescope - November 2015 - 3
Sky and Telescope - November 2015 - A
Sky and Telescope - November 2015 - B
Sky and Telescope - November 2015 - 4
Sky and Telescope - November 2015 - 5
Sky and Telescope - November 2015 - 6
Sky and Telescope - November 2015 - 7
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Sky and Telescope - November 2015 - Cover3
Sky and Telescope - November 2015 - Cover4
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