Observation by Alex Pratt: (693) Zerbinetta occults 4U 461-49902

Uploaded by

Alex Pratt

Observer

Alex Pratt

Observed

2018 Mar 08 - 00:43

Uploaded

2018 Mar 08 - 15:30

Objects

Conjunction

Equipment

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

Exposure

0.16s (4 integrated video frames)

Location

Z92

Target name

Asteroid (693) Zerbinetta and star 4U 461-49902

Title

(693) Zerbinetta occults 4U 461-49902

About this image

The mag 13.6 82km diameter asteroid (693) Zerbinetta was predicted to occult the mag 13.9 star 4U 461-49902 on 2018 March 8. Their combined magnitude of 12.99 would drop by 0.5 mag for up to 5.5 seconds.

My observatory was inside the predicted shadow zone. The predicted probability of success at my site was 48.4% and I recorded an occultation duration of 4.80s. I watched the asteroid approaching the star, then they merged and the occultation occurred. The times of disappearance and reappearance were:-

D 00:42:58.44 +/- 0.08s

R 00:43:03.24 +/- 0.08s

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

Another 5 stations across Europe were logged in OccultWatcher for this event, so we might have some chords across the asteroid's profile.

Files associated with this observation

2018-Mar-08 00-42-02 (42)_Bin1_Form.png (81.9 kB)

Like this image

Dr Andrew Smith, Jeremy Shears, Graham Winstanley, Dean Ashton OBE, Ray Emery, David Basey, Peter Carson

Copyright of all images and other observations submitted to the BAA remains with the owner of the work. Reproduction of work by third parties is expressly forbidden without the consent of the copyright holder. By submitting images to this online gallery, you grant the BAA permission to reproduce them in any of our publications.

Registered charity no. 210769
Registered company no. 117572

For more information including contact details, click here.

Our Terms of Use are here.

Our Privacy Policy is here.