Stellar Mass Black Hole

Stellar Mass Black Hole
Designations
Alternate Names	singularity traps, gravity wells, spacetime warps, mass concentrators, or cosmic sinkholes, etc.
Orbital Characteristics
Number of Observations	Likely less than a million
Physical Characteristics
Mean Radius	A few km
Surface Area (total)	Varies on the mass of the Black Hole
Volume	Oftenly described with 0 volume
Mass	5-50 solar masses
Mean Density	Quadrillions of grams per cubic centimeter
Rotation Period (sidereal)	Multiple rotations per sec
Albedo (geometric)	Very close to 0
Albedo (bond)	Very close to 0
Absolute Magnitude	Varies
Apparent Magnitude	Varies
Age	From thousands of years to billions of years
Observation Data
Mean Distance from Earth	A few thousand ly to several thousand ly
Visual Brightness	Not visible, but can be very bright
Angular Size	Extremely Small
Proper Orbital Elements
Proper semi-Major Axis	A few to a few tens of AU