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Physics LibreTexts

18.0.55: wiu6thesupernovaof1885

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Data
Step
Item
Value
1
Angular Size
?? arc sec
2
Expansion Rate
?? km/s
3
Physical Size
?? lightyear
4
Distance
?? lightyear
Introduction
Steps:
  1. Use the image to measure the angular size of the remnant.
  2. Use the spectrum to estimate the expansion velocity of the cloud.
  3. Use the age of the remnant and its expansion velocity to determine the physical size of the cloud.
  4. 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
Next

This page titled 18.0.55: wiu6thesupernovaof1885 is shared under a CC BY-NC-SA license and was authored, remixed, and/or curated by Kim Coble, Kevin McLin, & Lynn Cominsky.

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