Large bright object slowly and silently glided across the sky, then instantly accelerated and disappeared.

My father, brother, and I were watching a classic movie late at night when all of a sudden, a bright light crept into our peripheral vision. My dad instantly ran to the window and out onto the balcony while screaming “What on earth is that?” My brother and I excitedly jumped up and followed him onto the balcony where for a few seconds we watched this thing in awe as it slowly and silently glided across the sky towards the south west.
The object was travelling at an approximate altitude of 300 meters (1000 ft), and it was large (definitely larger than any commercial or military aircraft). I also remember it emitting an interestingly illuminated dark reddish powder like substance. I say “interestingly” because it wasn’t actually illuminated yet it was still easily visible against dark sky. The best I can describe it is coloured powder like the ones thrown around in India during the Holi Festival, but in the dark.
A few moments after spotting and staring at the object, my dad asked me to get my mum who had fallen asleep on the couch. As I was getting my mum to wake up, my brother and my dad witnessed the object instantaneously accelerate in a southernly heading and disappear into the horizon.
Witnessing the object was strange enough, but what made the experience even weirder was that a few days later, it was reported in one of the regional newspapers that radar personnel and other facility members at an air force base in the city of Kecskemet had also spotted an unidentified object.
This was in 1991, so there was no way of finding out anything else about the sighting other than whatever was reported in the newspaper (which at the time was validating enough).
The incident remained in the back of my mind as an interesting experience for over 20 years until I needed a topic for a university project. I decided to use this experience as a narrative for a graphic short story, which also allowed me to recall and visualize the incident.
As I researched the event further, to my surprise, I came across a Hungarian news report about the event. Since then, I have also found that the incident was also included in a CIA pdf list, referred to as Black Vault, which became available to the public after the United States government passed the Freedom of Information Act.