Parameter

Unit

G1.9+0

kepler

Tycho

1006

SN 1987A

Cas A

Crab nebula

Cygnus loop

IC443

t_{beginning of radiative phase}

Yr

22.7 × 10⁴

7 × 10⁴

7.5 × 10⁴

24 × 10⁴

2 × 10⁴

1.46 × 10⁴

4.28 × 10⁴

3.57 × 10⁴

1.04 × 10⁴

R

Pc

63.9

19.7

27.5

100.7

17.6

13

17.62

22

7.25

V

Km∙s⁻¹

280

279.5

364

417

394

355

163.6

244.6

277

T

Kelvin

1.8 × 10⁶

1.77 × 10⁶

3 × 10⁶

3.9 × 10⁶

3.5 × 10⁶

2.86 × 10⁶

0.6 × 10⁶

1.35 × 10⁶

1.7 × 10⁶

M

M_ʘ

255

25

135

3321

557

336

279.5

217.6

389