A representation of the orbit of (20041) Gainor, with its position on November 9, 2023 (NASA JPL)
This week the Working Group on Small Bodies Nomenclature of the International Astronomical Union (IAU) published its latest list of about 40 new names it had approved for minor planets. Twenty of them were named after Canadians, including a number of people I know from my involvement in astronomy. One was named (20041) Gainor, after me.
(20041) Gainor had been discovered on December 18, 1992, by Japanese astronomers A. Natori and T. Urata, and it was known as 1992YH before this week. Over time after the original discovery, additional observations had shown that it is in the Main Belt of asteroids between Mars and Jupiter, about three times as far away from the Sun as the Earth. It takes 1523 days or more than four years, to make one orbit of the Sun. The asteroid is 5.167 km in diameter and rotates every 2.62 hours, and it is tilted nearly 14 degrees to the ecliptic.
The biography issued with ‘my’ asteroid, which can also be called 20041 Gainor, notes that I am "a Canadian journalist, historian and amateur astronomer with a PhD in the history of technology from the University of Alberta. He has written six books about aerospace, including Not Yet Imagined, the operational history of the Hubble Space Telescope, published by NASA in 2021. Gainor was President of the RASC in 2018–2020.”
The first asteroid, Ceres, was discovered in 1801, and today roughly half a million minor planets have been assigned a number. So far, only about 20,000 have been named. Discoverers have 10 years to suggest a name, after which the naming goes to the IAU’s Minor Planet Center. Names must be 16 characters or less, one word (although first and last names are often combined), pronounceable, non-offensive, non-commercial, and not too similar to an existing name.
Today many astronomers, usually armed with cameras, along with automated telescopes and even satellites, are involved in the search for asteroids, particularly those that might collide with the Earth. Multiple observations are required to establish the path of each asteroid. Canadians are involved in the search for asteroids, including some who use the Plaskett Telescope at the Dominion Astrophysical Observatory in Saanich, B.C., a few miles away from my home. Others are consulted on good names for asteroids, and I thank those people for their role in this honour.
This week’s list of minor planets from the IAU includes the names of several friends from the Royal Astronomical Society of Canada, including my Victoria Centre colleague Lauri Roche, and prominent science journalists like Ivan Semeniuk, Dan Falk and Nicole Mortillaro, along with environmentalist David Suzuki, the best known Canadian in this list. The others on the list come from a variety of countries and occupations, the best known being the namesake of (332884) Arianagrande.
Right now (20041) Gainor is more difficult than usual to see because it is on the other side of the Sun from the Earth. Even when the asteroid and the Earth are on the same side of the Sun some months from now, it will be very dim - around 13th magnitude. But I hope to get a chance to see it some time.
