2021 July 18 - Asteroid occultation event

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2021 July 18 - Asteroid occultation event

(464) Megaira / HIP 117476 event on 2021 Jul 18, 19:57 UT

I've prepared finder charts from DSS and The Sky 6.
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IOTA/IOTA-ES occultation update for
(464) Megaira / HIP 117476 event on 2021 Jul 18, 19:57 UT
Visible from China


Summary
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On 2021 Jul 18 UT, the 76.8 km diameter asteroid (464) Megaira will occult a
9.1 mag star in the constellation Aquarius for observers along a path across
China.

In the case of an occultation, the combined light of the asteroid and the star
will drop by 4.42 mag to 13.53 mag (the magnitude of the asteroid) for at most
10.9 seconds.

This update is based on, astrometry for the asteroid kindly provided by the IAU
Minor Planet Center.

This work has made use of data from the European Space Agency (ESA)
mission Gaia (http://www.cosmos.esa.int/gaia), processed by the
Gaia Data Processing and Analysis Consortium
(DPAC, http://www.cosmos.esa.int/web/gaia/dpac/consortium).
Funding for the DPAC has been provided by national institutions, in
particular the institutions participating in the Gaia Multilateral Agreement.

The event at a glimpse
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* Rank: 97
* date and approx. time of event: 2021 Jul 18, 19:43 - 2021 Jul 18, 20:11
* geocentric midpoint of event [JD]: 2459414.33158750
* magnitude of target star: 9.13
* magnitude drop [mag]: 4.42
* estimated maximum duration [s]: 10.9
* Moon: 66 % sunlit, 127° distance
* Sun: 123° distance
* rough path description: China

Additional comments
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RUWE high,

The occultation path
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* approximate projected width [km]: 85
* 1 sigma uncertainty interval [path widths]: +/- 0.38
* 1 sigma uncertainty interval [seconds]: +/- 4.4
* 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.036, +/- 0.011)
* 1 sigma uncertainty ellipse (major, minor, PA): (0.037", 0.008", 77°)
* approx speed of asteroid's shadow [km/s]: 7.0641
* website for maps:
http://www.asteroidoccultation.com

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