View allAll Photos Tagged cluster
Captured 9 Jan 2021, 01:03 hrs UT, Springfield, VA, USA. Bortle 8 skies, Mallincam DS10C camera, Celestron 8 inch SCT f6.1, exposure 10 sec, gain 20, bin 1, stack of 30 light frames, no filter.
Clouds: clear
Seeing: F
Transparency: 3
Moon phase: 17%
FOV: 47 x 36 arcmin
Resolution: 0.77 arcsec/pixel
Orientation: Up is xx degrees E of N
Apparent magnitude: +7.1
Apparent size: 15 arcmin
Appearance: large, bright cluster, [Tr III2r], no central concentration, medium range of brightness, many stars, white stars in cluster are distinct from rich background
From Wikipedia:
NGC 663 (also known as Caldwell 10) is a young open cluster in the constellation of Cassiopeia. It has an estimated 400 stars and spans about a quarter of a degree across the sky. It can reportedly be detected with the unaided eye, although a telescope is recommended for best viewing. The brightest members of the cluster can be viewed with binoculars. Although the listed visual magnitude is 7.1, several observers have reported higher estimates.
After adjusting for reddening due to interstellar dust, the distance modulus is estimated as 11.6 magnitudes. It is located about 2,100 parsecs distant with an estimated age of 20–25 million years. This means that stars of spectral class B2 or higher (in the sense of higher mass), are reaching the end of their main sequence lifespan. This cluster appears to be located in front of a molecular cloud, although the two are not physically associated. This cloud has the effect of blocking background stars from the visual image of the cluster as it lies at a distance of 300 parsecs.
This cluster is of interest because of the high number of Be stars, with a total of about 24 discovered. These are spectral class B stars that show prominent emission lines of hydrogen in their spectrum. Most of the Be stars in the cluster lie between spectral class B0 and B3. A candidate member of the cluster, LS I +61° 235, is a Be star with an X-ray binary component that has a period of about three years. There are at least five blue stragglers in the cluster. These are stars that formed by the merger of two other stars. Two of the cluster's star systems are likely eclipsing binaries with periods of 0.6 and 1.03 days. NGC 663 also has two red supergiant stars, both located on its periphery.
The star cluster is assumed to form part of the stellar association Cassiopeia OB8, that is located in the Perseus arm of the Milky Way, along with the open clusters M103, NGC 654, NGC 659, and some supergiant stars scattered between them, all of them having similar ages and distances.
I worked with the admin of this cluster for a couple of hours to migrate it into this rack and redo the cable management.
It's not bad. I wish we had shorter power cables so we didn't have to hide so much mess, and I'd prefer more unified ethernet cables so that they could be swept to the side more gracefully, but this is definitely not terrible.
Live Oak Cluster Beetles (Cibdelis blaschkei)?, Mitchell Canyon, Mount Diablo State Park, Clayton CA
I worked with the admin of this cluster for a couple of hours to migrate it into this rack and redo the cable management.
It's not bad. I wish we had shorter power cables so we didn't have to hide so much mess, and I'd prefer more unified ethernet cables so that they could be swept to the side more gracefully, but this is definitely not terrible.
cluster-amaryllis in kinchakuda, Saitama Pref. Japan
In Japan, cluster-amaryllis is called higanbana or manjyusyage.
周りが赤い中で一本だけぽつんと白。
I think these photos are better than the real thing! Iota galaxy ...a billion light years from anywhere
cluster-amaryllis in kinchakuda, Saitama Pref. Japan (taken in 2005)
In Japan, cluster-amaryllis is called higanbana or manjyusyage.
2005年撮影。
This is an image, taken on May 19, of a popular object and telescope target in the spring sky, a giant ball of a million stars called Messier 13, the great globular cluster in Hercules. Through a 5-inch (130mm) or larger telescope it looks fabulous! At any dark-sky public stargazing session in spring or summer, at least one telescope will be aimed at M13.
Technical:
Taken with 130mm apo refractor at f/6 with Canon 7D camera at ISO800. Stack of 4 x 8 minute exposures, median combined. © 2010 Alan Dyer
For this asymmetrical necklace I created a cluster of shells, gemstone and glass beads and accented it with another shell further up the silver-plated chain. I started with a small cowry shell which I topped with a small blue faceted glass bead. Next I added a small whelk shell framed by small apatite beads. The rest of the cluster is composed of aqua "quartz" glass, fluorite and apatite. The small shell sitting further up the chain is another whelk paired with bright blue apatite. I framed the lobster claw clasp with two more blue glass beads
The 6MSP was the formal diplomatic meeting of the 119 States—which as to the date of meeting—had accepted the 2008 Convention on Cluster Munitions, including 19 Signatories.
The Cluster bombing of Niš was an event that occurred on May 7, 1999 during the Kosovo War. It was the most serious incident involving civilian deaths and the use of cluster bombs.
The mid-day NATO attack on Niš airfield, which is located on the edge of the city, killed fourteen civilians and injured twenty-eight. Cluster bomb submunitions fell in three widely separated areas: near the Pathology building of the Niš Medical Center in southeast Niš; in the town center near the Niš University Rector's Office, including the area of the central city market place, the bus station near the Niš Fortress, and the "12th February" Health Center; and near a car dealership and the "Niš Express" parking lot across the river from the fortress.
NATO confirmed the attack on Niš airfield, and on May 8, NATO Secretary General Solana confirmed NATO responsibility for the attack, stating that "NATO has confirmed that the damage to the market and clinic was caused by a NATO weapon which missed its target."
First flowers to open on our now very floriferous Calytrix tetragona plant. I have long wanted this shrub in the garden and it has not disappointed! [Lower Blue Mountains, NSW]
Cluster Balloon Flight - Canaan, CT 2010
Large balloons filled with helium and attached to a seat to lift a man off the ground for flight.
Want to know more about cluster balloons?
Go to: www.clusterballoon.org
'Clustered' bronze Skeleton bust sculpture, self portrait of the artist suffering a cluster headache. Artist Simon Fearnhamm Raven Armoury www.ravenarmoury.com www.skelemental.co.uk
Photography by Tracy Howl
Double Cluster (Top - NGC 869 Bottom - NGC 884)
Stellarvue S80L telescope - 80mm aperture / 600mm FL
Televue 0.8X reducer (480mm effective FL)
Takahashi P2Z mount unguided
Canon EOS 400D
Seventeen 1min exposures at ISO 1600 (Cropped)
Martin Bell, Lord Elton and campaigners from Landmine action, Oxfam, Amnesty, Saferworld and Human Rights Watch urge the UK government to stop using lethal cluster bombs.
Contact tlyras@landmineaction.org or phulme@oxfam.org.uk for press release and more details.
Photo Credit: Marcus Rose at Insight Visual