Observation by Alex Pratt: (521) Brixia occults TYC 1977-01111-1

Uploaded by

Alex Pratt

Observer

Alex Pratt

Observed

2018 Feb 13 - 22:41

Uploaded

2018 Feb 14 - 14:36

Objects

Conjunction

Equipment

C11 f/10 and f/3.3 focal reducer
Watec 910 video camera
IOTA-VTI GPS video time inserter
OccuRec
Tangra and AOTA

Exposure

0.16s (4 integrated video frames)

Location

Z92

Target name

Asteroid (521) Brixia and star TYC 1977-01111-1

Title

(521) Brixia occults TYC 1977-01111-1

About this image

On 2018 February 13 the mag 12.3 111km diameter asteroid (521) Brixia was predicted to occult the mag 12.3 star TYC 1977-01111-1. Their combined magnitude of 11.7 would drop by 0.77 mag for up to 8.6 seconds.

My observatory was inside the predicted shadow zone. The predicted probability of success at my site was 96.9% and I recorded an occultation duration of 4.16s. It was fascinating to watch the asteroid approaching the star, then they merged and the occultation occurred. The times of disappearance and reappearance were:-

D 22:41:00.46 +/- 0.08s

R 22:41:04.62 +/- 0.08s

The attached plot shows the analysis of the light curve using Tangra and AOTA software.

There were 18 stations across Europe logged in OccultWatcher for this event and 11 have reported positive (light drop) observations. This is one of the best observed occultations by this main belt asteroid, producing a good shape profile from the multiple chords. It can be viewed here.

Files associated with this observation

2018-Feb-13 22-39-59 (27)_Bin1_Form.png (70.7 kB)

Like this image

Dr Andrew Smith, Ray Emery, David Swan, Mr Leonard Entwisle, Peter Mulligan, Graham Winstanley, David Basey, Nick James, Peter Carson, Steve Knight, Jeremy Shears, Tracie Heywood

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