Algieba (star)/meta
NOTE CONCERNING POSITIONS OF STARS AND CELESTIAL OBJECTS :
When comparing real-astronomical celestial object positions to the Traveller Map of Charted Space, it needs to be observed that the axes of the Charted Space Map appear to be tilted about 45o counter-clockwise from the correct position (i.e. "true" Coreward actually lies in the general direction of the Lesser Rift). If one makes that adjustment, about 70% of the named stars and celestial objects will fall roughly along their correct bearing. However, there are some exceptions in which the star in question lies in roughly the correct position relative to the Charted Space Map without the need to rotate the coordinate axes.
In general, if one is assigning the position of a Real-Universe star or celestial object to a Traveller Map hex, it should be acceptable if:
- 1) The object's longitude angle (θ) is within a 45o bearing-arc between the "true" coordinate axes and the Traveller Charted Space Map coordinate axes, and
- 2) The object's assigned distance from Terra on the hexmap falls somewhere between its true distance R in parsecs, and its 2D-projection onto the flat map as seen from above, found by Dproj = {R * cos(ɸ)}, where (ɸ) is the latitude angle. If desired, the distance above/below the plane can be determined by Z = {R * sin(ɸ)}.
PLACEMENT NOTES:
There are two worlds listed on TravellerMap with the name Algieba:
- 1) Algieba/Regulus (Alpha Crucis 1640).
- 2) Algieba/Gamma Leonis (Neworld 1317). (Non-Canonical)
Since Algieba is otherwise known as Gamma Leonis, the location in the Regulus (Alpha Leonis) subsector of Alpha Crucis is a possibility. However, the primary star listed in the T5SS data for Algieba/Alpha Crucis is M2 V, so this cannot be the canonical star Algieba, though the canonical Algieba might be nearby in the same hex and otherwise undesignated. Whether this was intentional or an oversight in the T5SS data is unknown.
On the other hand, the Algieba in the Unofficial data of Neworld Sector has the correct stellar data and roughly the proper distance and bearing of the canonical star from Terra, as well as being located within the Gamma Leonis Subsector.
ASTRONOMICAL NOTES:
Astronomers have discovered two exoplanets in the Gamma Leonis A star system:
- The Gamma Leonis planetary system
- ɣLeo Ab
- Mass: ≥8.78 MJ Semi-Major Axis: 1.19AU Period: 429 days
- ɣLeo Ac (unconfirmed)
- Mass: ≥2.14 MJ Semi-Major Axis: 2.6AU Period: 1340 days