4 Per
4 Per
4 Per is a B-type (Blue-White) star located in the constellation Perseus. It carries the designation 4 Per.
Located approximately 728.0 light-years from Earth, 4 Per resides within the broader disk of our Milky Way galaxy.
4 Per is classified as a spectral class B star (B-type (Blue-White)) on the Harvard spectral classification system.
With an apparent magnitude of +4.99, 4 Per sits near the limit of naked-eye visibility. It can be glimpsed without optical aid under dark skies, but binoculars will make observation much easier. Observers will note its blue hue, which corresponds to a B-V color index of -0.071.
Physical Properties
| Spectral Class | Class B — B-type (Blue-White) |
| Color Index (B−V) | -0.071 |
Observation
| Apparent Magnitude | +4.99 |
| Absolute Magnitude | -1.75 |
| Distance | 728 ly |
| Constellation | Perseus |
Position
| Right Ascension | 2h 2.30m |
| Declination | 54° 29.25′ |
Frequently Asked Questions
What type of star is 4 Per?
4 Per is a Class B — B-type (Blue-White) star.
How far is 4 Per from Earth?
4 Per is approximately 728.0 light-years from Earth.
Can you see 4 Per with the naked eye?
With an apparent magnitude of 4.99, 4 Per is visible to the naked eye.
What constellation is 4 Per in?
4 Per is located in the constellation Perseus.