Trapeshopen

Trapezium
Oppdaget av	Galileo Galilei
	Observasjonsdata; Epoke J2000
Stjernebilde	Orion
Rektascensjon	05h 35.4m
Deklinasjon	−05° 27′
Avstand	1.6 kly(490 pc)
Tilsynelatende størrelsesklasse (V)	4.0
Tilsynelatende dimensjoner (V)	47 (bs)
	Fysiske egenskaper
Masse	?
Tilsynelatende alder	3 × 105 år
Andre betegnelser	1ES 0532-05.4, OCl 528.0, CCDM J05353-0524, C 0532-054, RX J0535.3-0523, PBC J0535.1-0522, 2MAXI J0535-052, 41 Ori

Trapeshopen er en åpen stjernehop med stjerner i hjertet av Oriontåken, i stjernebildet Orion. Stjernehopen ble oppdaget av Galileo Galilei. 4. februar 1617 skisserte han tre av stjernene (A, C, D), men ikke den omgivende tåken.^[1]^[2]^[3]

Referanser

^ Galileo Galilei: Siderius Nuncius, Venice, 1610. English Translation published at Bard College, Hudson NY" October 9, 2003 English Translation [1] Arkivert 7. februar 2012 hos Wayback Machine. Original Latin version [2] Arkivert 29. juni 2011 hos Wayback Machine.
^ Tom Pope and Jim Mosher: Galilean telescope homepage" March 17, 2006 «Arkivert kopi». Arkivert fra originalen 30. januar 2008. Besøkt 30. januar 2008. , «Some have expressed puzzlement that in his text Galileo does not mention the nebulosity (known in modern nomenclature as M42) enveloping these stars. ... Galileo believed, as he explains in Sidereus Nuncius, that what looks nebulous to the eye is resolved into stars by his telescope; what looks nebulous through his telescope could presumably also be resolved into stars by a still larger and more powerful telescope. Hence, a diffuse glow would be, more than anything, an indication of the limitations of his telescope and not particularly worthy of special note.»
^ Tom Pope and Jim Mosher: Page on Galileo's February 4, 1617 notebook drawing of the Trapezium region, May 2, 2006 "Perhaps significantly, Galileo makes no mention of having noticed the now well-known gas cloud, M42, surrounding the Trapezium stars."[3] Arkivert 11. august 2011 hos Wayback Machine.

Lada, E.A. (1996). «Circumstellar Disks in the Trapezium Cluster». Bulletin of the American Astronomical Society (på engelsk). 28: 1342. Bibcode:1996AAS...189.5301L.
Poveda, Arcadio (2005). «Low-Mass Runaway Stars from the Orion Trapezium Cluster». Astrophysical Journal (på engelsk). 627 (1): L61–L64. Bibcode:2005ApJ...627L..61P. arXiv:astro-ph/0506002 . doi:10.1086/432053.