Observation by Alex Pratt: (19810) Partridge occults UCAC4 484-0511...

Uploaded by

Alex Pratt

Observer

Alex Pratt

Observed

2019 Apr 12 - 21:06

Uploaded

2019 Apr 16 - 18:27

Objects

Conjunction

Equipment

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

Exposure

0.08s (2 integrated video frames)

Location

Z92

Target name

Asteroid (19810) Partridge occults star UCAC4 484-051174

Title

(19810) Partridge occults UCAC4 484-051174

About this image

The mag 18.6 asteroid (19810) Partridge, 9 km in diameter, was predicted to occult a mag 12.1 Kepler2 star in Leo on 2019 April 12. Observers within the 12 km wide shadow track could see a brief drop in brightness of 6 magnitudes for up to 1s.

My site was 51 km outside the predicted track with a 3.9% probability of success. I was delighted to record a dip in brightness of 0.96s as the asteroid occulted the star. The attached plot shows the analysis of the light curve using Tangra and AOTA.

D - 22 07 16.83 ± 0.04

R - 22 07 17.79 ± 0.04

I must have been very close to the centre line of the asteroid's shadow. The mid-time of the occultation and the Gaia position of the target star will give high-precision astrometry of the asteroid.

Compensation for having missed some recent high probability events due to cloudy nights.

Files associated with this observation

(19810) Partridge occults UCAC4 484-051174 Tangra AOTA Z92 ARP.png (83.4 kB)

Like this image

David Basey, Mr Leonard Entwisle, Jeremy Shears, Graham Winstanley, Andy Wilson, Ray Emery, Andrew Dumbleton, Tim Haymes, john simpson, Mr Michael Alan Frost, Mike Foylan, Peter Carson

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