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sn2018pv & NGC3941 Polarimetry

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About this observation
Observer
john simpson
Time of observation
21/02/2018 - 21:25
Object
sn2018pv & NGC3941
Observing location
SW Scotland
Equipment
Celestron C6
Astrodon [J-C] V-band filter
WollastonPrism
ATIK 314L+
Exposure
60 sec.
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I have no chance with my setup to make separate measurements of each, but have attempted to measure the linear polarisation of the combined pair. Conditions poor with some clouds on 13th Feb & only managed 10 images [60 sec. exposure] at each rotation angle. Better on the 21st and managed  series of [20,20,20,30] for 0, 45,90,135 deg rotations. Measurements uncorrected for interstellar polarisation, so still a bit of work to do on them.

 

 

Date

 

 

Stokes Q[%]

measured

 

 

Stokes U[%]

measured

Polarisation P[%]

corrected using

my setup calibration against

standards

Polarisation angle

Θ[deg anticlockwise from N.celestial meridian]

13.8516/02/18UT

0.88[+/- 0.4]

0.08[+/-0.5]

0.85[+/-0.4]

-0.4[+/- 11]

21.8921/02/18UT

1.02[+/-0.15]

0.03[+/- 0.18]

0.99[+/-.15]

-2.3[+/- 6]

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