gingadan.com

NGC 4755 (Jewel Box)


Home > Caldwell > NGC4755
Down
Movie

NGC 4755
Open Cluster (散開星団)
Jewel Box (宝石箱)
OC I3r

別名 (Other names)
OCL 892, ESO 131-SC16, Caldwell 94, Jewel Box Cluster

明るさ (Brightness)
4.2等級

星座 (Constellation)

みなみじゅうじ座 (Cru) (Crux)

距離 (Distance)
6,500光年 (6,500 light-years)

NGC 4755 (Caldwell 94) は、みなみじゅうじ座にある散開星団。
その美しさから宝石箱(ほうせきばこ)の名で知られる。

みなみじゅうじ座β星の西南方向に位置し、およそ100個ほどの星が集まる若い星団である。
赤色超巨星を中心に青白く輝く若い恒星が多数取り囲むその姿は大変美しい。星団の大きさは約20光年。
地球からの距離は6,400光年程度と推測されているが、諸説ある。

1751年から1752年にかけて、南アフリカにおいてニコラ・ルイ・ド・ラカーユにより発見され、みなみじゅうじ座のκ星として登録された。その経緯からみなみじゅうじ座κ星団(κ Crucis Cluster)とも呼ばれる。宝石箱の名は、ジョン・ハーシェルによって名付けられた。

NGC 4755 (Jewel Box Cluster) is an open cluster located 6,500 light years from the Earth in the constellation Crux.

NGC 4755 (Jewel Box) : Picture

Jewel Box Cluster
Jewel Box Cluster
(C) ESO
The FORS1 instrument on the ESO Very Large Telescope (VLT) at ESO’s Paranal Observatory was used to take this exquisitely sharp close up view of the colourful Jewel Box cluster, NGC 4755. The telescope’s huge mirror allowed very short exposure times: just 2.6 seconds through a blue filter (B), 1.3 seconds through a yellow/green filter (V) and 1.3 seconds through a red filter (R). The field of view spans about seven arcminutes.

NGC 4755 (Jewel Box)
NGC 4755 (Jewel Box)
(C) ESO
This image of the well-known NGC 4755 cluster or Jewel Box was taken with the Wide Field Imager (WFI) on the MPG/ESO 2.2-metre telescope at ESO’s La Silla Observatory. It highlights the cluster and its rich surroundings in all their multicoloured glory. The field of view is 20 arcminutes across. The picture is based on images obtained through B, V and I filters.

NGC 4755
Digitized Sky Survey 2 Image of NGC 4755
(C) ESO, ESA/Hubble and Digitized Sky Survey 2. Acknowledgment: Davide De Martin (ESA/Hubble)
A wide-field image of the region around NGC 4755 (the Jewel Box) constructed from data from the Digitized Sky Survey 2. The bright star is Mimosa, one of the four stars in the Southern Cross. The darkness towards the bottom of the image is part of the Coal Sack, a vast area of obscuring dust easily visible to the unaided eye. The field of view is approximately 2.8 degrees x 2.9 degrees, or about 40 times the area of the Full Moon.

NGC 4755: A Jewel Box of Stars
NGC 4755: A Jewel Box of Stars
Credit: Anglo-Australian Telescope photograph by David Malin
Copyright: Anglo-Australian Telescope Board
The great variety of star colors in this open cluster underlie it's name: The Jewel Box. The bright central star Kappa Crucis is red, in contrast to the many blue stars that surround it. The cluster contains just over 100 stars, and might be no older than 10 million years. Open clusters are younger, contain few stars, and contain a much higher fraction of blue stars than do globular clusters. This Jewel Box lies about 7,500 light-years away, so the light that we see today was emitted from the clusters before even the Great Pyramids in Egypt were built.

NGC 4755 (Jewel Box) NGC 4755 (Jewel Box)
NGC 4755 (Jewel Box)
(C) ESO
NGC 4755 (Jewel Box)
(C) ESO
Up
Up

NGC 4755 (Jewel Box) : Movie

Up
Home > Caldwell > NGC4755
Up

「ウィキペディア(wikipedia):フリー百科事典」より文章引用。
NGC 4755. (2014, February 5). In Wikipedia.
gingadan.com ブログパーツ