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Chondrules in the chondrite classification Grassland. A millimeter scale is shown. Chondrules in the Carbonaceous Chondrite NWA 13887. A chondrule (from Ancient Greek χόνδρος chondros, grain) is a round grain found in a chondrite. Chondrules form as molten or partially molten droplets in space before being accreted to their parent asteroids.
IC 5146 (also Caldwell 19, Sh 2-125, Barnard 168, and the Cocoon Nebula) is a reflection [2] /emission [3] nebula and Caldwell object in the constellation Cygnus. The NGC description refers to IC 5146 as a cluster of 9.5 mag stars involved in a bright and dark nebula.
IRAS 22036+5306, also known as 2MASS J22053028+5321327, is a protoplanetary nebula located in the constellation Cepheus at approximately ~6,500 light-years from Earth. [2] [1] The nebula was created by the shedding of most of the material in the outer shell of an aging star. The gas cloud formed is heated by the still burning hot core of the ...
[1] In the second release, some coordinates for southern hemisphere regions have an uncertainty over 1 minute of arc. [1] This can make them difficult to find, so a revised catalog called BFS (Blitz, Fich and Stark) was released [1] with 65 new regions and about 20 removals. [1] Most of the removed items were the aforementioned nebula or ...
NGC 2264 is the location where the Cone Nebula, the Stellar Snowflake Cluster and the Christmas Tree Cluster have formed in this emission nebula. For reference, the Stellar Snowflake Cluster is located 2,700 light years away in the constellation Monoceros.
Normal achondrites form by crystallizing from a magma and will show magmatic textures. [2] Lodranites are for example seen as residues of partial melting, while acapulcoites are seen as partial melts, but both were produced by partial melting. Ureileites and brachinites remain uncertain and could either be explained as residues or cumulates. [1]
The nebula is known as S 142 in the 1959 Sharpless catalog (Sh2-142). [2] It is extremely difficult to observe visually, usually requiring very dark skies and an O-III filter. The NGC 7380 complex is located at a distance of approximately 8.5 kilolight-years from the Sun , in the Perseus Arm of the Milky Way .
It is associated with a dark cloud L1450 (Barnard 205). Estimates of the distance to this nebula range from 980–1,140 ly (300–350 pc). [4] This nebula is in the western part [4] of the Perseus molecular cloud and is a young region of very active star formation, [6] being one of the best-studied objects of its type. [4]
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