Planets for Humanity

Extrasolar Planets

Delta Pavonis

Closeup: Delta Pavonis

Extrasolar Overview

Star System Identities:
HD 190248, HR 7665, Gliese 780, SAO 254733, CP -66 3474, MSDB 3412.

No planets have yet been discovered in this system. It is entirely possible that the orbits of any planets are facing toward us rather than edge on. Such an arrangement would make them impossible to discover by radial velocity changes of the parent star's spectrum or by eclipse (transiting planets across star's face).

Two sets of "eco-zone" orbits are included for this star. The brighter set are for the current condition of Delta Pavonis as it enters its sub-giant phase. The fainter set are for the past condition of the star when it was still in the main sequence — a star's long adulthood, burning at a relatively constant rate. As Delta Pavonis continues to expand toward its giant stage, it will become hotter, and the Earth-normal orbit (temperate) will continue to move farther from its sun. Because its mass is very similar to that of Sol, its characteristics are similar to those of our own sun nearly seven billion years in the future.

New Earth?
If an Earth-like world exists in the Delta Pavonis system, it has likely suffered climatically over the last few million years. If the planet was near the "hot" eco-zone boundary, the planet may now be entirely uninhabitable on the surface. Any citizens may have gone underground, or built artificial domes, or fled their world.

If a world existed close to the Earth-normal distance, it may have become more humid, overall. This could cause more cloud cover, which would tend to cool the planet slightly (bouncing some of the increased sunlight back out into space). This could also increase rainfall, and possibly bring about an increase in the world's jungles.

If a marginal world existed close to the "frigid" eco-zone boundary during the star's main sequence, it may now be enjoying a "Golden Age" of warmth. This could turn many of its "Ice Age" deserts into lush forests and grasslands.