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Northern Prairie Star Party Black Nugget Lake September 15, 2012

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Northern Prairie Star Party Black Nugget Lake September 15, 2012 . Brian Martin The King’s University College. Three Fundamental “Sciences”. Measuring “Distance”, Position & “Scale”  Astrometry Measuring Brightness and Intensity  Photometry Measuring “Colour”  Spectroscopy.

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slide1

Northern Prairie Star Party

Black Nugget Lake

September 15, 2012

Brian Martin

The King’s University College

three fundamental sciences
Three Fundamental “Sciences”
  • Measuring “Distance”, Position & “Scale”  Astrometry
  • Measuring Brightness and Intensity  Photometry
  • Measuring “Colour”  Spectroscopy

Exciting science that you can do from the back yard!

astrometry
Astrometry

August 29, 2012

H-alpha filter

0.001 s exposure

ED80

Atik 314L+ camera

TKUCO

How big are the lunar features in this image?

some math
Some Math …

S

R

q

  • The Small Angle Formula Rq* = S where:
    • R = distance from object
    • q = angle that the object subtends in the sky
    • S = distance across the object

* Angle in radians

the scale of your telescope
The Scale of Your Telescope
  • Scale in (seconds of arc)/mm found by:
  • In the previous image a ED80 telescope was used so the scale is (206265)/(600 mm) = 343.8 “/mm
  • The Atik 314L+ has 6.45 mm pixels, so each pixel has a scale of 342.8”/mm × 0.00645mm/px = 2.22 “/px when used with the ED80
  • By measuring the number of pixels you can measure the angle that an object or feature subtends
slide6

304 px = 1236 km

850 px = 3457 km

(0.5% error)

some other images
Some other images…
  • Capuanus Crater:
    • December 26,2009
    • C14, f/11
    • Imaging source DMK2104
    • 2000 frames
    • Scale = 0.20”/px
    • Distance = 0.002523 AU
slide8

Apennines (Eratsothenes, Archimedes)

    • March 1, 2012
    • C14, f/7
    • Atik 314L+
    • 20 frames (0.005 s)
    • Scale = 0.52”/px
    • Distance = 0.00262 AU
slide9

Jupiter

    • November 5, 2011
    • C14, f/11
    • Imaging Source DMK2104
    • LRGB (~2000 frames each)
    • Scale = 0.26”/px
slide10

M57

    • August 26, 2011
    • C14 f/7
    • ST7E
    • LRGB
    • Scale 1.49”/px
    • Distance = 2300 ly
slide11

M15

    • August 21, 2011
    • C14 f/7
    • ST7E
    • LRGB
    • Scale 1.49”/px
    • Distance = 33 Kly
photometry measuring changes in brightness
Photometry – Measuring Changes in Brightness
  • Intrinsic Variables
    • dScuti
    • SX Phe
  • Novae and Supernovae
  • Cataclysmic Variables
consumer grade ccd cameras
Capable of doing excellent science!

Modest cost (< $2000)

Excellent software support

Monochrome with no anti-blooming is preferred

Pixel size should be carefully matched to image scale – need to oversample

Capable of milli-magnitude precision photometry

Consumer grade CCD cameras…

Atik 314L+

SBIG ST7E

sx phoenicis variables
SX Phoenicis Variables
  • BL Camelopardalis
    • Average mag 13.1
    • Period
      • 0.0389d
      • 56 minutes – this is an exciting system to watch!!

40 s integration, C14 f/7

ST7E camera – KAF400 detector

the light curve
The Light-Curve…

November 9, 2009

BL Cam

Teff 7730 K

Age ~4Ga

Metal poor

Period shows a

Small change over time!

November 9, 2009, s (C2-C1) = 0.007 mag