Greater Shell Nebula

The Greater Shell Nebula is a reflection nebula located in the central part of Coro Sector, within the Empty Stars.

• It is an astrographic feature and a nebula.

Description (Specifications)

The Greater Shell Nebula is a large dim group of gases and dark clouds measuring around seven parsecs coreward-rimward by around six parsecs spinward-trailing. The nebula has a large "tail" extending for nearly five 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 (H₂), with the remainder made up of helium (He), oxygen (O₂), nitrogen (N₂), and other elements. The clouds have a mean density of 10^–6 particles/cm³. Its central regions are relatively denser.

A trinary star systems lie at its core:

Hex Location: 1007 Coro Sector. 2 Gas Giants.

Trinary Solar System

GSN1-abc Trinary Star System

Star Name	Hierarchy	Category		Mass (Sol)	Temp (K)	Luminosity (Sol)
GSN1-abc A4 II	Primary	Supergiant		11.6	8200 - 8800	1120
	Unit	Diameter	Min Distance	Hab 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
	None
Star Name	Hierarchy	Category		Mass (Sol)	Temp (K)	Luminosity (Sol)
GSN1-abc G1 V	Secondary	Main Sequence		1.03	5770 - 5860	1.109
	Unit	Diameter	Min Distance	Hab Zone	Jump Shadow	M-Drive Limit
	AU	0.0049	0.0873	1 - 1.75	0.49	4.9
	Orbit #	*	*	4	1	6
	Remarks
	None
Star Name	Hierarchy	Category		Mass (Sol)	Temp (K)	Luminosity (Sol)
GSN1-abc M1 V	Tertiary	Main Sequence		0.5	3620 - 3660	0.08839
	Unit	Diameter	Min Distance	Hab Zone	Jump Shadow	M-Drive Limit
	AU	0.0023	0.0247	0.31 - 0.59	0.23	2.3
	Orbit #	*	*	1	0	5
	Remarks
	None

History & Background (Dossier)

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.

Image Repository

TravellerMap:
[1]

Worlds & Sectors (Astrography)

This astrographic feature is primarily found in the following areas:
Uncharted Space:

• Coro Sector
  • Unnamed Subsector

World Listing: 1105

The following systems and worlds are associated with this astrographic feature:

No world articles for Greater Shell Nebula

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 Far Future Enterprises or by permission of the author. The page history lists all of the contributions.

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