Author Archives: JR

JR

About JR

S. N. Johnson-Roehr is Observing Editor at Sky & Telescope. She favors Vega and the Double Double.

Hercules Galaxy Cluster.

Hercules Galaxy Cluster: Going Deep

To aid your observing endeavor, Contributing Editor Steve Gottlieb has provided an expanded table of galaxies, with their position angles, visual magnitudes, size, and positions.

Trifid Nebula sketch

The Trifid Nebula

Here's some further reading on the stages of star formation visible in the Trifid Nebula, subject of the May 2016 issue's Going Deep column.

M81 — cool, too.

Two Cool Galaxies: M81 and M82

How many details can you see when you take a look at galaxies M81 and M82? On October 13, 2015, Contributing Editor Howard Banich experienced a spectacular morning of observing at Steens Mountain in southeastern Oregon. With fantastic transparency and increasingly good seeing, he was able to view M82 as he'd never seen it before.…

NGC 3172 by David Ratledge

Circumpolar Galaxies

On a single night at a remote site, Contributing Editor Steve Gottlieb observed 35 circumpolar galaxies. Here we're providing a complete list of those 35 galaxies,

Elliptical Galaxy IC 2006

Monster Galaxies

Take advantage of early evenings and dark winter skies — turn your scope southward to view some of the most massive objects in the universe.

Path of Pluto in 2015 (wide field)

See Pluto in 2015

It’s been a fantastic year for Pluto, and it’s only going to get more so. What better time to make your first (or second!) attempt at spotting the dwarf planet? Read on for a few tips to help you locate this dim object in the summer sky.

NGC 4921

The Herschel Sprint

Experience Herschel’s “Night of Discovery” for yourself! Follow this guide to recreating William Herschel's amazing night covering 73 deep-sky delights.

Gottlieb KTG

Isolated Triplets of Galaxies

S&T contributor Steve Gottlieb has made available data distilled from the Karanchentseva catalogue and his own observations to assist you in your observations of isolated triplets of galaxies.

Default entry screen for NASA JPL HORIZONS Web-Interface.

Generating an Ephemeris

Terry N. Trees show us how to create an ephemeris, a table showing a celestial object's calculated positions for a given time period, using JPL HORIZONS data.