Observation by john simpson: sn2018pv & NGC3941 Polarimetry

Uploaded by

john simpson

Observer

john simpson

Observed

2018 Feb 21 - 21:25

Uploaded

2018 Feb 22 - 11:00

Objects

NGC3941

Equipment

Celestron C6
Astrodon [J-C] V-band filter
WollastonPrism
ATIK 314L+

Exposure

60 sec.

Location

SW Scotland

Target name

sn2018pv & NGC3941

Title

sn2018pv & NGC3941 Polarimetry

About this image

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 13^th Feb & only managed 10 images [60 sec. exposure] at each rotation angle. Better on the 21^st 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]

Files associated with this observation

SN2018PV-V135-ATIK-87.jpg (113.2 kB)

Like this image

Jeremy Shears, David Basey, Peter Mulligan, Peter Carson, Matt Williams

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