Observation by Derek Robson: Asteroid Florence

Uploaded by

Derek Robson

Observer

Derek Robson

Observed

2017 Sep 02 - 23:00

Uploaded

2018 Sep 22 - 16:59

Objects

3122 Florence

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Constellation

Delphinus

Field centre

RA: 20^h44^m
Dec: +15°53'
Position angle: +22°37'

Field size

0°45' × 0°56'

Equipment

Canon 1100d/Tamron 70-300 mm lens

Location

Loughborough

Target name

Florence

Title

Asteroid Florence

About this image

Stack of 36 exposures, and final crop of stack, inverted to negative. Direction of motion of Florence shown by red arrow.

Files associated with this observation

Florence trail - 3 Sept 2017-crop negative with mags & arrow.jpg (247.0 kB)

Like this image

Jeremy Shears, Graham Winstanley, Eric Watkins, Callum Potter, Grant Privett, Len Entwisle, Andy Wilson, Peter Carson

Comments

Derek Robson, 2018 Sep 22 - 17:09 UTC

Grant Privett, 2018 Sep 22 - 22:46 UTC

Were there any missed exposures or are the gaps in the trail due to real brightness variations? How long are the exposures and are they all evenly spaced?

Derek Robson, 2018 Oct 05 - 03:25 UTC

Grant. I need to look up the conditions used.

Derek Robson, 2019 Aug 11 - 14:04 UTC

Gaps are not due to change in brightness, but rather, due to deliberately taking longer exposures (3.2-20s) at certain times in the period and also frames which had drifted too far outside the target area (undriven mount, just a tripod); both were excluded from the stack.

Exposure 2s, f5.6, ISO 6400. Not all evenly spaced, but most were aimed at every 1 min.

Period 1hr 8m. 00:41-01:49hr 3/9/17. Total images taken 49. 36 used to stack. 5 darks taken.

Focused on Altair for lens focus prior to use.

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