closest approach


Also found in: Acronyms.

closest approach

[′klō·səst ə′prōch]
(astronomy)
The event that occurs when two planets or other celestial bodies are nearest to each other as they orbit about the sun or other primary.
The place or time of such an event.
References in periodicals archive ?
During last year's closest approach, Juno was a relatively distant 2.090 astronomical units (313 million km) from us.
In 2003, Mars made its closest approach to Earth in nearly 60,000 years!
The longest 'blood moon' eclipse this cen-tury coincided with Mars' closest approach in 15 years on Friday to offer skygazers a thrilling astronomical double bill.
The thrilling spectacle coincided with Mars' closest approach in 15 years today to offer sky watchers a stunning astronomical double bill, WAM reported.
Mars is also expected to be at its brightest on Friday, being at its closest approach towards the Earth since 2003.
ON THIS DAY LAST YEAR: Scientists revealed that an asteroid that could have been big enough to devastate much of the UK, was making its closest approach to Earth in 400 years.
At closest approach, it will be at a distance of 2.6 million miles / 4.2 million km -- over 10 times the distance between Earth and the Moon.
He said that when a Full Moon takes place while the Moon is near its closest approach to Earth, in its elliptical shape orbit around the Earth, the moon is called a Super Full Moon or a Super Moon.
The term "supermoon" was introduced by American astrologer Richard Nolle, who defined it as "a new or full moon which occurs with the moon at or near (within 90% of) its closest approach to Earth in a given orbit."
Thus (i) the absence of conflicts and (ii) the confirmation that a conflict has been resolved depend on determining the distance of closest approach (DCA) that is not less than the SSD.
A supermoon occurs when a full moon or new moon coincides with the moon's closest approach to Earth, also known as perigee.