Started looking at Capella. Using a small sheet of tracing paper to allign the star in the optic fibre coupling. With Capella at a high Altitude we switched to Betelgeuse as a target to make allignment easier.

Viewed Capella at

5hrs 20' 30'' RA

45deg 8' 2'' DEC

with the micrometer at Grating-4mm, Angle-3.25mm, Focus 20.2mm.

changed the RA 5'' either side to align it centrally while observing the intensity recieved.

Betelgeuse

Next look at Betelgeuse,

5hrs 58' 32' RA

6deg 25' 30'' DEC

Took a 30s exposure at 4mm to look at the spectrum as best as possible. Then took 60s exposures of Betelgeuse between 0mm and 10mm in steps of 0.5mm.

After Betelgeuse we briefly moved to the Orion nebula however it was too dim to observe.

Pollux

7hrs 46' 14'' RA

27deg 59' 18'' DEC

Again took 60s exposures from 0mm on the grating position micrometer too 10mm in steps of 0.5mm.

Laurie left at 23:00

Castor

7hrs 35' 22'' RA

31deg 51' 40'' DEC

60s exposure from 0mm too 5mm in steps of 0.5mm

JC SH SB LN

Log Book Entry No.63

Created: 19 Jan 2015 21:31:25

Last Revised: 19 Jan 2015 23:32:41

JoeCooper

Spectral Observations (Betelgeuse,Pollux,Castor)

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