Unnamed stars
The following is a list of unnamed stars.

By planet 
 Kaelon II's sun

By system 
 Bajoran system's sun
 Cardassian system's sun
 Gamelan system's sun
 Laap system's sun
 Romulus system's sun
 Trialas system's sun

By quadrant 
 Unnamed Alpha and Beta Quadrant stars
 Unnamed Delta Quadrant stars
 Unnamed Gamma Quadrant stars

Andromeda Galaxy

Makers' homeworld sun 
This star, in the Andromeda Galaxy, was the primary for the Makers homeworld. Sometime before 2268, this star went supernova, destroying its system. ()

Unknown location

Abronian supernova star
Centuries prior to 3190, this star went supernova and destroyed the original Abronian homeworld. The only surviving Abronians were those who fled in a moon they had converted into a starship. The event was depicted in a mural within the ship. ()

Lwaxana Troi star
Lwaxana Troi once had a star named after her by an astronomer from Rigel IV. ()

Mad planet's sun 

This star was shone over the mad planet. ()

Nyrian system star
According to the Nyrians (who proved to be less then honest), the Nyrian system contained a red giant star. ()

O-type star 
In 2256, the  accidentally jumped into close proximity of this O-type star while trying to jump to Corvan II, and sustained minor damage during its escape. ()

Unusual dead star 
This dead star was encountered by the  while on course for Questar M-17 in 2269. It was discovered to be the source of mysterious radio emisions previously assumed to be from Questar M-17.

The object was unusual in that it had negative mass and intense hypergravity. A spectral analysis of the star revealed imploded matter, on which every reading was negative as well. Its surface appeared cratered. It also had some magnetic force. It was too far away from any G1 stars to be reached using sub-warp travel.

On stardate 5221.3, the  discovered the dead star while star charting. It was forced to go into orbit due to the object's hypergravity, after which the crew discovered an ancient vessel also in orbit. 

A magnetic organism living inside the ancient ship returned to the Enterprise along with the away team and subsequently took control of that vessel. The Enterprise escaped, trapping the organism in Questar M-17's magnetic field. ()

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Stars