Allen's Astrophysical Quantities is a comprehensive reference book that contains data and information on various astronomical objects and phenomena, such as stars, galaxies, and planetary systems. It is commonly used by astronomers and astrophysicists as a reliable source of information.
The last update to Allen's Astrophysical Quantities was published in 1999 because the book's author, Arthur N. Cox, passed away in 1996. As the book was a product of his extensive research and expertise, there has not been a new edition or update since then.
While some of the data and information in Allen's Astrophysical Quantities may have become outdated due to advancements in technology and new discoveries, it is still considered a valuable resource for astronomers and astrophysicists. The majority of the information in the book is still accurate and relevant.
Yes, there are other reference books and databases available that contain similar information to Allen's Astrophysical Quantities. Some examples include the "Astronomical Almanac" and the "Handbook of Space Astronomy and Astrophysics" by Martin V. Zombeck.
It is unlikely that there will be a new edition or update to Allen's Astrophysical Quantities in the future, as the original author is no longer alive to continue his work. However, other resources are constantly being updated and new discoveries are being made in the field of astronomy, so it is important to consult multiple sources for the most up-to-date information.