Langrenus Crater (Bruce Rohrlach)

Contains: Solar system body or event

Langrenus Crater

Acquisition type: Electronically-Assisted Astronomy (EAA, e.g. based on a live video feed)

Langrenus Crater

Acquisition type: Electronically-Assisted Astronomy (EAA, e.g. based on a live video feed)

So many features for us "lunatics" to explore. This is Langrenus crater on the eastern shores of Mare Fecunditatis (Sea of Fecundity). Wreathed in beautiful wall terraces, Langrenus is of Late Eratosthenian age (1-2 billion years old). One of only 7 craters known to have troctolite within its central peaks (equal parts olivine and plagioclase). An equally interesting fact is that it is the site of one of the best documented lunar transient events (Icarus, V146, Issue 2 pp. 430-443). The French astronomer Audouin Dollfus noted that the northern floor of Langrenus temporarily brightened when observed in polarized light on December 30, 1992 and January 2, 1993. His interpretation was that the transiently bright polarized areas were produced by outgassing that lifted dust above the crater floor. This is a well-documented observation, and is made very believable by enhanced concentrations of radon at Langrenus (and nearby Fecunditatis) detected during the Apollo 15 and 16 missions. The fact that the central peaks of Langrenus sampled deep crustal rocks (troctolites) likely has some connection to the proposed degassing.

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	Distinct awarded users	Total awarded images
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This table shows the distribution of awards per subject type, compared to the popularity of images of that subject type.
	Image of the day	Top pick	Top pick nominations	Total submitted
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	Image of the day	Top pick	Top pick nominations	Total submitted
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Professional, scientific grade data
Mix of multiple sources
Other
Unknown

The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

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Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
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Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
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