Do modern day astronomers identify any particular celestial body as potentially being Revelation's Wormwood?

Yes:

"What is this outer-space body threatening our solar system? Extraterrestrial information states it is referred to as Battlestar Wormwood. Now if we check Revelations in the Bible we will find reference to the star 'Wormwood'."

http://www.bibliotecapleyades.net/hercolobus/esp_hercolobus_0.htm

Astronomers several years ago saw a distant star brighten as a dark matter object passed in front it, a phenomenon known as gravitational lensing. New observations using the Hubble Space Telescope and the European Southern Observatory's Very Large Telescope scouted the neighborhood and determined the gravity source to be a dim red star less than a tenth as massive as our sun. Its orbit and name SEDNA, are known by the ancients called wormwood, thus when the orbit comes close to the sun again every 10,000 years, it will have bodies, like comets, meteors, asteroids, around its gravity, so you could say you will know it's here, buy the fact it has companions "space debris" the problem is its massive!

http://www.cyberspaceorbit.com/wormy.htm

There is any number of Bible believers who strain to find an astronomical identity for it. They should not be confused with astronomers.

"But beyond the timing and the description there is another fascinating Scriptural connection to Apophis. John tells us that the asteroid he is describing in revelation "has a name and it is called Apinthos (errantly replaced with 'Wormwood' in English Bibles)." Etc.
ydayahweh.com/Yada_Yahweh_Good_News_Erchomai.YHWH [no longer exists]

Here is a typical if not definitive spiritual exegesis:
"Some take this to be a political star, some eminent governor, and they apply it to Augustulus,... Others take it to be an ecclesiastical star, ... and they fix it upon Pelagius, ... ...this star fell...[and] turned those springs and streams into wormwood, made them very bitter, that men were poisoned by them; either the laws, which are springs of civil liberty, and property, and safety, were poisoned by arbitrary power, or the doctrines of the gospel, the springs of spiritual life, refreshment, and vigour to the souls of men, were so corrupted and embittered by a mixture of dangerous errors that the souls of men found their ruin where they sought for their refreshment."
https://oncedelivered.net/2012/04/23/a-great-star-fell-from-heaven-revelation-810-11/

Astoundingly, yes.

Well, not specifically, but generally. Not a particular body but a particular kind of body.

My previous, deleted comments claiming no modern-day astronomer would possibly entertain, much less purport to prove, such an idea turned out to be erroneous. Nonetheless, this is far from mainstream thought, and with almost zero possibility of being factual, except in a far-out sense that leans upon Einstein's ideas of relativity.*

I have just exchanged emails with one Dr. Gerardus Bouw, a Bible literalist, who speculates Wormwood is not Apophis but is more apt to be a comet.
See page 24 here:
http://www.geocentricity.com/ba1/no119/wormwood.pdf

The man has a doctorate in astronomy from Case-Western Reserve. He believes the earth is flat and that the stationary Earth is the barycenter of the Universe. That means he espouses the Tychonian model in which all the planets except Earth revolve around the Sun, and the whole kit and kaboodle revolve around the Earth.

He most recently was a tenured professor of computer programming at Baldwin-Wallace College in Berea, Ohio.

http://www.geocentricity.com/bibastron/index.html


*Einstein himself also says:

"The struggle, so violent in the early days of science, between the views of Ptolemy and Copernicus would then be quite meaningless. Either CS could be used with equal justification. The two sentences, 'the sun is at rest and the earth moves,' or 'the sun moves and the earth is at rest,' would simply mean two different conventions concerning two different CS. -- Einstein and Infeld, The Evolution of Physics, p.212 (p.248 in original 1938 ed.)"
http://www.geocentrism.com/possible.htm