Back in the day, and I mean starting around the turn of last century, you'd hunt for planets by taking photos through your telescope days or weeks apart, and then comparing the two plates.
Today I proved to myself that I have photographed Neptune from my front garden.
This evening, I took this shot with my DwarfII - 10x15s exposures, stacked, and filtered to make everything cyan. In theory, somewhere in this image is Neptune. Good luck working out where.
|Cyan tinted star scape. Somewhere, Neptune is lurking.|
Last week, I did the same thing, but I tinted this one yellow.
|Yellow star scape. Neptune still hiding.|
Next, I composited them in Snapseed, and played with the opacity slider.
|Neptune in two locations, circled|
Two very cool things about this.
One, I did this with a telescope the size of a 1L UHT carton from my garden in the middle of suburbia!
Two, it clearly shows how planets got their name - from the Greek planētēs meaning 'wanderer', referring to the way the move about compared to the stars, which are fixed relative to each other.