If you've just read Jerry Oltion's article "Seeing Triple" in the September 2022 issue of Sky & Telescope magazine and are wondering where to find a table of data and charts, you've come to the right place. Below are the accompanying finder charts that will give you an overview of where to find the targets in the sky, in addition to a table that reports coordinates of each of the targets, as well as other data such as magnitudes and apparent sizes and separations.

Table of Data

Iota CassiopeiaeTriple star4.6, 6.9, 9.03.0″, 6.7″02h 29.1m +67° 24′
Triangle in Pleiades24 TauStar6.303h 47.4m+24° 07′
HD 23607Star8.303h 47.3m+24° 07′
HD 23608Star8.703h 47.3m+24° 08′
Triangle in GeminiHD 51502Lucida of triangle7.3, 7.4, 8.4124.1″, 106.8″, 81.2″06h 58.1m +14° 14′
Triangle in MonocerosHD 46867Lucida of triangle8.4, 9.2, 9.430.3″, 33.6″, 39.6″06h 35.9m+05° 19′
Triangle below M11S ScutiCarbon star6.818h 50.3m–07° 54′
37 ClusterNGC 2169Open cluster5.96′06h 08.4m+13° 58′
Yield SignTriplet of double stars04h 30.0m+15° 55′
The Stargate Σ1659Asterism7.9, 8.328.1″12h 35.7m–12° 01′
Cluster tripletNGC 663Open cluster7.115′01h 46.3m+61° 13′
NGC 654Open cluster6.56′01h 44.0m+61° 53′
NGC 659Open cluster7.96′01h 44.4m+60° 40′
Cluster tripletM46Open cluster6.120′07h 41.8m–14° 49′
M47Open cluster4.425′07h 36.6m–14° 29′
NGC 2423   Open cluster6.712′07h 37.1m–13° 52′
Great Hercules ClusterM13Globular cluster 5.820′16h 41.7m+36° 28′
Trifid NebulaM20Nebulae20′ × 20′18h 02.3m–23° 02′
Barnard’s E NebulaB142Dark nebula40′ × 40′19h 39.7m+10° 31′
B143Dark nebula60′ × 60′19h 41.4m+11° 00′
Leo TripletM65Spiral galaxy9.3 9.8′ × 2.9′11h 18.9m+13° 06′
M66Spiral galaxy8.99.1′ × 4.2′11h 20.3m+12° 59′
NGC 3628Spiral galaxy9.514.8′ × 3.0′11h 20.3m+13° 35′
Other Leo TripletM95Barred spiral galaxy9.77.4′ × 5.0′10h 44.0m+11° 42′
M96Spiral galaxy9.37.6′ × 5.2′10h 46.8m+11° 49′
M105Elliptical galaxy9.35.4′ × 4.8′10h 47.8m+12° 35′
Bonus triplet (with M105)NGC 3384Elliptical galaxy9.95.5′ × 2.5′10h 48.3m+12° 38′
NGC 3389Spiral galaxy11.92.8′ × 1.3′10h 48.5m+12° 32′
Andromeda GalaxyM31Barred spiral galaxy3.4190.5′ × 61.7′00h 42.6m+41° 15′
Pinwheel GalaxyM33Spiral galaxy5.770.8′ × 41.7′01h 33.9m+30° 40′
Draco TripletNGC 5981Spiral galaxy13.02.8′ × 0.5′15h 37.9m+59° 24′
NGC 5982Elliptical galaxy11.12.6′ × 1.9′15h 38.7m+59° 21′
NGC 5985Spiral galaxy11.15.5′ × 3.0′15h 39.6m+59° 20′
Angular sizes and separations are from recent catalogs. Visually, an object’s size is often smaller than the cataloged value and varies according to the aperture and magnification of the viewing instrument. Right ascension and declination are for equinox 2000.0.

Finder Charts

The finder charts are listed in the order of the first target to appear in the table above.

Finder Chart for Cosmic Triplets September 2022
Use this chart to find the open clusters in Cassiopeia, as well as the two Local Group galaxies.
Sky & Telescope
Finder Chart for Cosmic Triplets September 2022

Sky & Telescope
Finder Chart for Cosmic Triplets September 2022
This chart leads you to a triplet of stars and a fascinating region of dark nebulae.
Sky & Telescope
Finder Chart for Cosmic Triplets September 2022
Leo's hindquarters and belly are brimming with triple galaxies.
Sky & Telescope
Finder Chart for Cosmic Triplets September 2022
A globular cluster in Hercules presents an interesting triple feature.
Sky & Telescope


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