Observation by Alex Pratt: (212) Medea occults UCAC4 581-011811

Uploaded by

Alex Pratt

Observer

Alex Pratt

Observed

2022 Jan 21 - 20:15

Uploaded

2022 Jan 22 - 17:05

Objects

212 Medea

Equipment

C11 f/10 and f/3.3 focal reducer
Watec 910HX video camera
IOTA GPS 1PPS video time and date inserter
OccuRec (recording)
Tangra and AOTA (reduction)

Exposure

0.64s (16 video frames)

Location

Z92 (Bortle 7)

Target name

(212) Medea occults UCAC4 581-011811

Title

(212) Medea occults UCAC4 581-011811

About this image

The 145 km diameter asteroid (212) Medea, mag 13.1, occulting a mag 12.4 star in Taurus for 37.12 s.

I had swift-moving clouds and had my fingers crossed that one of the clearer gaps would move over the star at the right time. Luckily it did and I got the attached light curve. I could have used a shorter integration time but it was a S/N gamble with the cloud cover. Because of Medea's very slow sky motion at the moment the integration setting of 0.64 s was still acceptable to time a chord across the asteroid.

D - 20 15 31.37 ± 0.32

R - 20 16 8.49 ± 0.32

Duration : 37.12 s

Mid-event : 20 15 49.93 UT

http://www.euraster.net/results/2022/index.html#0121-212

A video clip is available here

(212) Medea occults UCAC4 581-011811

Files associated with this observation

20220121_212_UCAC4_581_011811_ARP_AOTA_Tab 6.png (336.5 kB)

Like this image

Jeremy Shears, Dr Paul Leyland, Ron Arbour, Tim Haymes, Eric Watkins, David Basey, Peter Carson, Nick Quinn, Graham Winstanley

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