Greater Shell Nebula

The Greater Shell Nebula is a reflection nebula located in the central part of Yearn Sector, within the Empty Stars. It lies within the Great Void.

Greater Shell Nebula

The Greater Shell Nebula is a large dim group of gases and dark clouds measuring around 7 parsecs coreward-rimward by around 6 parsecs spinward-trailing. The nebula has a large "tail" extending for nearly 5 parsecs to rimward.

• It is classified as a reflection nebula and is primarily formed of ionized gases, thrown off by the stars at its center many millennia ago.
• The gases consist of about 90% hydrogen, with the remainder made up of helium, oxygen, nitrogen, and other elements. The clouds have a mean density of 10²–10⁶ particles/cm³. Its central regions are relatively denser.

A trinary star systems lie at its core:

GSN1-abc has three stars in the star system.

GSN1-abc
	Type	Category		Mass (Sol)	Temperature (K)	Luminosity
	A4 II	Bright Giant		11.6	8200 - 8800	1120
	Unit	Diameter	Safe Distance	Habitable Zone	Jump Shadow	M-Drive Limit
	AU	0.13771	2.77584	26.61 - 43.37	13.771	137.71
	Orbit #	0	5	9	7	11
	Remarks
GSN1-abc
	Type	Category		Mass (Sol)	Temperature (K)	Luminosity
	G1 V	Main Sequence (Dwarf)		1.03	5770 - 5860	1.109
	Unit	Diameter	Safe Distance	Habitable Zone	Jump Shadow	M-Drive Limit
	AU	0.0099	0.0873	1 - 1.75	0.99	9.9
	Orbit #	*	*	4	3	7
	Remarks
GSN1-abc
	Type	Category		Mass (Sol)	Temperature (K)	Luminosity
	M1 V	Main Sequence (Dwarf)		0.5	3620 - 3660	0.08839
	Unit	Diameter	Safe Distance	Habitable Zone	Jump Shadow	M-Drive Limit
	AU	0.0047	0.0247	0.31 - 0.59	0.47	4.7
	Orbit #	*	*	1	1	6
	Remarks

Hex Location: 1007 Coro Sector. 2 Gas Giants.

History

The positions and types of the stars present within the Greater Shell Nebula have been cataloged as part of the University of Selasia Spinward Survey.

The nebula is named for its twisted conical shape, supposedly resembling a large seashell.

References & Contributors / Sources

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This list of sources was used by the Traveller Wiki Editorial Team and individual contributors to compose this article. Copyrighted material is used under license from Mongoose Publishing or by permission of the author. The page history lists all of the contributions.

• Author & Contributor: Lord (Marquis) and Master Scout Emeritus Adie Alegoric Stewart of the IISS
• Author & Contributor: Lord (Marquis) and Master of Sophontology Maksim-Smelchak of the Ministry of Science