Size and Density

Because they are the collapsed cores of old stars, white dwarfs are extremely small and dense. Generally, white dwarfs have masses comparable to that of the Sun, but diameters comparable to that of the Earth. A teaspoon of white dwarf matter transported to the surface of the Earth would weigh several tons. Here is a table summarizing the location, apparent magnitude, distance, and size of some nearby white dwarfs.

Bright White Dwarfs
Name	Constell	R. A.	Dec	Mag	Distance (ly)	Diameter (km)
Sirius B	CMa	06 45.1	-16.7	8.3	8.6	10,300
40 Eri B	Eri	04 15.4	-07.7	9.5	15.7	17,000
Procyon B	CMi	07 39.3	+05.2	10.7	11.4	17,500
Feige 34	UMa	10 39.6	+43.1	11.1	55	-
W1346	Cyg	20 34.4	+25.1	11.5	45	17,000
EG247	Cam	05 05.5	+52.8	11.8	140	23,000
He3 (EG50)	Aur	06 47.6	+37.5	12.0	60	13,000
EG62	Pyx	08 41.5	-32.9	12.0	30	22,000
EG368	Dra	16 48.4	+59.1	12.2	40	17,000
van Maanen's Star	Psc	00 49.2	+05.4	12.4	14	17,000
EG180	Cam	04 31.2	+59.0	12.4	18	16,000
AC +70 5824	UMi	13 38.9	+70.3	12.8	100	-
EG15	Ari	02 08.8	+25.2	13.2	100	18,000