Epsilon Aurigae Campaign 2009

Member Data

Campaign ID#: CID# 033

Name: Dr, Richard Miles

Mailing Address:

Golden Hill
Stourton Caundle
Dorset
DT10 2JP
England

Telephone #:UK-44-(0)1963-364651
Cell:
Okay to contact by Phone?:Yes
Hours available for phone: Most
Fax#:

E-Mail Address: rmiles@baa.u-net.com

Time Zone: GMT + 0

Web Site: None

Observatory Name: Golden Hill Observatory

IAU No. (If applicable): J77

Latitude: 50.931 deg North
Longitude: 02.405 deg West
Altitude (ASL): 75 m
Comment:

Telescope Used:

Telescope Used Type: Refractor
Aperture: 0.06 meter
Focal Ratio: f/5.95

Comment:TWO identical Takahashi FS60C each fitted with filter (fixed) and camera

Instrument/Detector Used (Model/Description)
Photometer:Starlight Xpress SXV-H9 CCD camera (Two)

For BVRI Photometry:

Spectrometer:
Polarimeter:
Other:
Comment: A single photometric measure is based on the average of 50 images. Brightest pixel is just less than 50% of the dynamic range of the camera. The exposure time of the two stars is different so that the total adu counts for each star are similar. This ensures that the degree of saturation of each image is very similar and so any non-linearity in the detector is largely eliminated. I have measured the linearity of the detector - I would expect it to be good to +/-0.2% over the range of brightness I am working with.

Areas of Interest (Please check all that apply)

Photometry:
Single Channel UBVR:
Single Channel BVRI :
Single Channel JH :
CCD V & Ic: X

Spectroscopy :

Polarimetry

Other (Specify)

Experience Level (Please Check One)
Beginning:
Some experience:
1 - 2 Years
Advanced: X

Do we have permission to publish your data on the Campaign Web Site?
Yes: X
No:

Comments:
I shall be doing simultaneous measurement in two filters. The telescopes are on a common mounting and are repointed so that the variable and comparison star images are recorded at the same/similar location on the CCD chip. This is akin to single-channel operation using a photometer. The brightness of Epsilon Aurigae requires slight defocussing of the V-filter telescope to ensure that the brightest pixels do not exceed 50% of the dynamic range. I can complete a set of C-V-C-V-C-V-C that's 350 images in each filter in less than 11 minutes.

Memberships:
ABAA, AAVSO