|AB Mass Center||0.0||...||...||...||...||...||...||...||...|
|Delta Trianguli A||0.045?||10.02||0.012||157||<1.09||0.98||...||...||0.13-0.31|
|Delta Trianguli B||0.065?||10.02||0.012||157||<0.75||...||...||...||...|
NOTE: This animation attempts to relate the possible orbits of Delta Trianguli AB (and their current habitable zone) to their common center of mass. To enlarge the display, the orbits have been arbitrarily rotated by 135 degrees. Although the initial display shows the system's actual orbital tilt (at an inclination of 157°) from the visual perspective of an observer on Earth, the orbital inclination of the known planetary companion "b" around Star A may be be different from that of the habitable zone orbit depicted here. In addition, for the purposes of this orbital animation, the mass of Star B is assumed to be no more than 0.75 Solar.
According to the new Sixth Catalog of Visual Orbits of Binary Stars, Stars A and B are separated on average by less than 0.11 AU (a= 0.0098 at a HIPPARCOS distance estimate of 35.4 ly). Their highly circular orbit (e= 0.020) takes only about 10.02 days (0.027434 years) to complete and is inclined around 167° from Earth's perspective (Hummel et al, 1995, pp. 389 to 390). According to calculations available from the Flagstaff Station of the U.S. Naval Observatory, orbit parameters derived from possibly more recent MARK III observational data are slightly different: a = 0.00993"; e=0.012; i= 157 +/- 2 degrees; and P= 10.02 days. The orbit of an Earth-like planet (with liquid water) around close-orbiting Stars A and B may be centered as close as 1.06 AU -- between the orbital distances of Earth and Mars in the Solar System -- with an orbital period of over 384 days (1.05 years).
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