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Messier 21 (M21) is an open cluster located in the constellation Sagittarius. The cluster has an apparent magnitude of 6.5 and lies at an approximate distance of 4,250 light years from Earth. Its designation in the New General Catalogue is NGC 6531.
Messier 21 is only 4.6 million years old, which makes it relatively young for an open star cluster. It is only 10 percent of the age of Messier 45, the famous Pleiades cluster in Taurus, and 1 percent the age of the Sun.
M21 consists mainly of small, faint stars, but is also home to a few blue giants.
The cluster contains about 57 confirmed members, but is pretty densely packed. It is classified as of Trumpler class I 3 r, which means that is a detached cluster with strong central concentation (I), consists of both bright and faint stars (3), and contains more than 100 stars (r).
The stars of M21 are believed to be members of the Sagittarius OB1 Association, a group of massive O and B-type stars that share a common motion, age and origin. The eight of the 10 brightest stars in the cluster are spectroscopic binaries with periods shorter than 6 days.
Messier 21 contains about 35 stars with a visual magnitude between 8 and 12. Many of these stars can easily be seen in a small telescope. 6-inch or larger telescopes will show many more stars tightly packed within an area 13 arc minutes in apparent size.
The open cluster lies just beyond naked eye visibility, but can easily be found even in the smallest binoculars. It is located 2.5 degrees northwest of Messier 8 (the Lagoon Nebula) and only 0.75 degrees to the northeast of Messier 20 (the Trifid Nebula). The cluster can be found using the Teapot asterism, formed by the brightest stars in Sagittarius, to first find either of the two famous nebulae and then use them to locate M21.
The best time of year to observe M21 is in the months of June, July and August.
Messier 11
Stack Size:30
Exposure: 45s
ISO: 6400
Lens: 8in SCT with f/6.3 focal reducer
Camera: Canon Rebel T7i with Astro Mod
Every couple of weeks I go through my stacks of magazines to scavenge for images, words, and letters to use in my art journaling.
James Simpson provides the after-dinner entertainment, Whittlesey, Cambridgeshire, England. Taken on July 6, 2009.
51/365-29/09/07
I have been so busy lately that the situation in my kitchen has gotten kind of out of hand, and my imaginary house husband just isn't pulling his weight.
children make art dough, monster mud, bubbles, paints, and edible creations at the Purcell Public Library.
June 9, 16, 23 & 30 2011
Lagoon Nebula (M8) in the constellation Sagittarius. At a distance from Earth of just over 4,000 light years, it is probably the largest emitting nebula in the galactic center.
50x60 sec
CANON 60D modified
Skywatcher 200/800 Whidephoto Telescope
Skywatcher EQ6R Pro mount
Nebulosa de la Laguna (M8) en la constelación de Sagitario. A una distancia de la tierra de poco más de 4.000 años luz, seguramente sea la nebulosa en emisión más grande del centro galáctico.
50x60 seg
CANON 60D modificada
Telescopio Skywatcher 200/800 Whidephoto
Montura Skywatcher EQ6R Pro
Bit of a meh day today. The car broke down, so we were late into work. Then the email and internet system at work crashed and nothing was working properly. MrH was going to be home late, so I took Milo out for a game of football and a run before the light disappeared. It was great fun and I managed to burn off a little frustration. Very messy though!
Tui can be quite messy feeders, as this one demonstrates by throwing sugar-water around. The yellow pollen on its head shows it's also enjoying feeding from the flax flowers in our backyard.
Caitlyn loves eating spaghetti and mince with her hands.
This is why we need an area in the house with no carpeting!
Messier A is a bowl-shaped formation with a circular rim that has received little wear. It has a ray system that extends for about 160 kilometers.
After waiting quite a lengthy period to solve the issue of combining the RGB data with the Luminance (L) of this, I have finally managed to do so. I am very new to this type of processing and as I only had 15 subs of L and 10 subs of R, G and B each to play with, I am really pleased with the result. Each sub was 7 minutes, 420 seconds, long. Total integration time just over 5 hours.
To cope with having such a tiny desk with no storage, I started keeping things piled beside the desk - I forgot to take a picture of this stuff when it was beside the desk, but it was just a messy, only piled on the floor.
Captured 24 Oct 2019, Staunton River star Party, VA, Bortle 4, C8 f6.3, clouds clear, transparency good, seeing good, no filter, E20sec, HCG22, stk 1, bin 1. No darks. PS edits.
from Wikipedia
Messier 32 (also known as M32 and NGC 221) is a dwarf "early-type" galaxy located about 2.65 million light-years from Earth, appearing in the constellation Andromeda. M32 is a satellite galaxy of the Andromeda Galaxy (M31) and was discovered by Guillaume Le Gentil in 1749. M32 measures 6.5 ± 0.2 thousand light-years in diameter at the widest point.
The galaxy is a prototype of the relatively rare, compact elliptical (cE) galaxy class. Half the stars concentrate within an effective radius of only 100 parsecs. Densities in the central stellar cusp increase steeply, exceeding 3×107 M⊙ pc−3 at the smallest radii resolved by HST, and the half-light radius of this central star cluster is around 6 parsec. Like more ordinary elliptical galaxies, M32 contains mostly older faint red and yellow stars with practically no dust or gas and consequently no current star formation. It does, however, show hints of star formation in the relatively recent past.