Triangulum - The Triangle
Pronounced "Try - anG - You - Lum"
Where to find the constellation
Constellation Chart
Triangulum is a very small constellation, nestled between Andromeda and Aries.
There aren't many objects within the capabilities of a beginner, but one of them - M33 - is one of the largest galaxies, and one of the few galaxies that it is possible to glimpse by naked-eye.
Only one notable open cluster - and a couple of double stars.
M33 - the Triangulum Galaxy
Sometimes visible by naked-eye from a good dark site - I've seen it by naked eye myself only once, in September 2005, from the exceptionally dark skies of Kielder Forest.
You can pick it up in binoculars under good conditions, but from my light-polluted suburban back garden, I've only ever managed to pick it up a few times, and that was with 6" aperture, and VERY low magnification.
At 3 million light-years distance - it is the next nearest major galaxy after Andromeda, and is one of the local group which consists of the Milky Way, Andromeda, M33, and several smaller, irregular galaxies
M33 is pretty large, so low powers are neccesary to fit it all in - best views often come from large binoculars - here it is at the same scale as the rest of the Messiers in these guides.
M33 is so large, and has so much detail, that many parts of it have their own designations, including several NGC and IC objects.
Star-hopping to M33..
Many of us know how to star-hop to M31 (Andromeda Gal) quite easily - an adaptation of the same 'hops' will lead you to M33
Starting from the 'W' of Cassiopeia, use the right-hand 'V' shape as a pointer to Mirach - from here you can go up through Mu Andromeda, and between Nu and 32 andromeda (those 4 make a 'Y' shape - M31 is just 'above' the 'Y')
To find M33, simply go 'down' the opposite way from Mirach - about the same distance that M31 is 'up' from Mirach.
Collinder 21 (Cr 21)
A small open cluster - about 8th magnitude, about 15 stars in a loose grouping. Just off the sharp edge of the triangle, and away from m33 a little.
Double Stars
6 triangulum is probably the best double - The components are about magnitudes 5 and 6.5, with a separation of 4 arcsec.
Theres another double with a separation of 4 arcsec - Epsilon triangulum- The primary is about mag 5.5, but the secondary is only 12th mag, making it difficult to see, especially in the glare from it's much brighter companion.
If you look for this one, don't be misled (at low power) by the orange 9th magnitude star at a distance of 3.5 arcMINS
Triangulum NGCs (with magnitudes) - from my own "1200 Northern NGCs" list
For those with 'GoTo' or a good chart
598 - Gal - 5.7 (M33 - Triangulum Galaxy)
672 - Gal - 10.7
750 - Gal - 11.9
777 - Gal - 11.5
784 - Gal - 11.5
890 - Gal - 11.2
925 - Gal - 9.9
949 - Gal - 11.6
959 - Gal - 12.3
1060 - Gal - 11.8
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