Eras

0.0 (before 2.4 billion BCE)

Pre-Pylistroph

1.0 (c. 2.4 billion BCE)

The Pylistroph

2.0 (c. 1.2 billion BCE)

Flight of the Daamin & Schism of the Hlutr. Nephestal founded.
2.1 (c. 600 million BCE)
Empire of the Iaranori
2.2 (c. 22 million BCE)
Virgo Wars
2.4 (c. 5.2 million BCE)
Avethellan Empire
2.6 (c. 1.63 million BCE)
Dorascan Empire
2.8 (c. 900,000 BCE)
Marpethtal Empire
2.9 (c. 800,000 BCE)
Empire of the Miethara

3.0 (c. 100,000 BCE)

Pre-Imperial Terra
3.75 Dance for the Ivory Madonna
3.962 "Gamester"
3.958 "Big Improvement"

4.0 (2153 CE/TE 0/12,153 HE)

5.0 (2624 CE/TE 471/12,624 HE)

Interregnum
5.38 A Rose From Old Terra

6.0 (2488 CE/12,488 HE)

New Continuum
6.55 "The Geas Ingenerate"

7.0 (10,274 CE/20,274 HE)

Second Terran Empire

8.0 (10,356 CE/24,356 HE)

Post-Imperial Humanity
8.5 The Leaves of October

9.0 (c. 3 million HE)

Endtime

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Xi Ursae Majoris

Primary of Illapa.

The two components are yellow G-type main-sequence stars. The brighter component, Xi Ursae Majoris A, has a mean apparent magnitude of +4.41. It is classified as an RS Canum Venaticorum type variable star and its brightness varies by 0.01 magnitudes. The companion star, Xi Ursae Majoris B has an apparent magnitude of +4.87. The orbital period of the two stars is 59.84 years, and they are currently separated by 1.2 arcseconds, or at least 10 AUs.

Each component of this double star is itself a spectroscopic binary. B's binary companion, denoted Xi Ursae Majoris Bb, is unresolved, but the binary star is known to have an orbital period of 3.98 days. The masses of both A and B's companions (Ab and Bb) (deduced by the sum total mass of the system minus the likely masses of Aa and Ba determined by their class) indicate that they are probably MV stars (red dwarfs), Bb being on the cool end of the M spectrum, not much hotter than a brown dwarf.

It also has the proper name Alula Australis (and erroneously Alula Australe).

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Xi Ursae Majoris