The Red Star is a mysterious heavenly body which appeared at the culmination of the Week of Nightmares on July 15, 1999. Known as Wormwood to vampires, Anthelios ("Anti-Sun") to werewolves, Telos or Mirzaba to mages, the Eye of the Demon Emperor to the Shen, the Eye of Apophis among the Reborn, and the Eye of Balor to changelings, the Red Star was seen by most supernaturals as being a sign of the End Times.
Dr. Bernhardt Mueller of the Sons of Ether predicted the coming of the Red Star, which he called Mirzaba, in the mid-1990s. He described it as a "hyperdimensional comet" and noted that by late 2012, it would be close enough to Earth to pose a collision risk. At the time, he was laughed out of the scientific establishment. After the Red Star became visible, a vindicated Mueller and Stanislaus Wojciehowicz noted that its previous passes coincided with the demise of scientifically advanced civilizations.
The Red Star was initially unable to be seen by mundane forms of perception. It could be seen only by supernatural creatures, but was readily apparent to oracles or people with Auspex. It could be seen in the Umbra, the Dreaming, and the Shadowlands.
As the end times neared, it brightened enough to be viewed by everyone. Using Hubble data, Marjorie Serway initially identified it as a comet, dubbing it "Serway's Comet." Dr. Xavier Filho disagreed with that interpretation. NASA declared the Red Star stellar object 2001KX76 (also Stellar Object #442899), theorizing it might be a reddish-coloured comet heading for Earth, although there was much disagreement on that point. By the rules of NASA's provisional designations, this would mean it was the 1,923rd object discovered in the second half of May, 2001, suggesting this is roughly when it became visible to mortals.
The Red Star became visible from most of the Northern Hemisphere, right in the bowl of the Big Dipper. Some theorize it may be a periodical visitor, perhaps the "bearded star" that presaged the destruction of Pompeii in 79 CE. Astronomers subsequently identified the Red Star as the dwarf planet 28978 Ixion, made highly visible in a freak event. 
Shortly after its appearance to mortals, the Red Star seemingly vanished just as mysteriously as it had appeared. The Void Engineers launched a cover-up, but are still suppressing evidence of the phenomenon.
The Red Star is still visible to certain Kindred in the current nights, who sometimes stare at it to gain blessings.
There was, at the time, an actual stellar object with the provisional designation of 2001 KX76, which is a trans-Neptunian Kuiper Belt object. It is, in fact, reddish in color, although far too small and distant to be seen with the naked eye. On 28 March 2002, it was named 28978 Ixion, after Ixion, the Greek equivalent of Caine. Ixion was subsequently mentioned in the main scenario in Ascension (in the form of the Ixoi and the Knife of Ixion), in V20, and in Vampire 5th Edition.