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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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

Exciting science that you can do from the back yard!

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 …

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

• 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

304 px = 1236 km

850 px = 3457 km

(0.5% error)

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

Apennines (Eratsothenes, Archimedes)

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

Jupiter

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

M57

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

M15

• August 21, 2011
• C14 f/7
• ST7E
• LRGB
• Scale 1.49”/px
• Distance = 33 Kly
Photometry – Measuring Changes in Brightness
• Intrinsic Variables
• dScuti
• SX Phe
• Novae and Supernovae
• Cataclysmic Variables
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

Atik 314L+

SBIG ST7E

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…

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