Data
Step
Item
Value
1
Angular Size
?? arc sec
2
Expansion Rate
?? km/s
3
Physical Size
?? lightyear
4
Distance
?? lightyear
Introduction
Steps:
- Use the image to measure the angular size of the remnant.
- Use the spectrum to estimate the expansion velocity of the cloud.
- Use the age of the remnant and its expansion velocity to determine the physical size of the cloud.
- Use the small angle formula to determine a distancr from the angulat size and physical size.
Measure Angular Size of SN
Calculation
Diameter (Pixels)
×0.049 arc sec/pixel =
?? arc sec
Measure Expansion Rate of SN
FWHM: 105.72
Line 1
Line 2
Line 1
×c =
?? km/s
Line 2
- 35
×c =
?? km/s
Average Velocity
?? km/s
Calculate Physical Size of SN
Age of Supernova
Years: 1998 - 1885 =
years
Seconds:
60 s
min
×
60 min
hr
×
24 hr
day
×
365 day
year
×
years =
0. seconds
Size of Supernova
Km :
0. seconds × ?? km/s
?? km
Ly :
?? km * 1.05e-13 ly/km=
?? ly
Distance to SN
Convert Angular Size to Radians
0
arcsec × 4.85e-6 rad/arcsec =
?? rads
Calculate Distance
?? ly
rads
=
?? ly
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