Alondra was the third planet in the Pallas 14 system. This was an uninhabited planet. (TAS: "One of Our Planets Is Missing") The location of the Pallas 14 system was depicted on a Federation star chart in 2293. (Star Trek VI: The Undiscovered Country)
In 2269, the USS Enterprise attempted to intercept an unidentified cosmic cloud that had entered the system near Alondra. However, en route, the crew noticed Alondra disappear from sensors, only to observe that planet was engulfed and consumed by the cosmic cloud creature. (TAS: "One of Our Planets Is Missing")
The Explored Galaxy: The location of the Pallas 14 system
Orbit of Alondra
The Explored Galaxy: This chart was also seen in several Star Trek: The Next Generation and Star Trek: Deep Space Nine episodes set in the 24th century, from the year 2364 to 2370. These were: TNG: "Conspiracy", "The Measure Of A Man", "The Emissary", "The Mind's Eye", "The Game" and DS9: "In the Hands of the Prophets", "Cardassians".
According to the Star Trek: Star Charts, on Chart I (United Federation of Planets I), Alondra was listed as a member planet of the Federation. It might be probable that the book's author and illustrator, Geoffrey Mandel, didn't know that Alondra had been destroyed.