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Lat: 10.0°S, Long: 23.1°W, Diam: 376 km, Depth: km,
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Apollo 16 AS16M-2493
; Bullialdus is the big crater near the top, and Kuiper is the small one near the bottom.
LPOD Photo Gallery
Lunar Orbiter Images
Ranger 7 - Camera A photographs
Ranger 7 - Camera B photographs
Ranger 7 - Camera P photographs
Mare Cognitum, “the sea that has become known”, with a diameter of 376 km (10.0 S 23.1 W), is located in a basin that sits within the proposed second ring of the Procellarum basin. The mountain range
to the northwest of the region may represent part of the rim-crest of a large buried crater, containing the mare.
A number of missions visited this region: Apollo 12 landed close to
landed on the hills at the edge of the
crater. Mare Cognitum is also the location where the
- The artificial craterlet and surrounding ejectablanket of Apollo 14's impacted S-IVB stage (in the western part of Mare Cognitum) is described and depicted in NASA SP-362, APOLLO OVER THE MOON; A VIEW FROM ORBIT, Chapter 5: Craters (
), Figures 120 and 121.
- On the LRO's
ACT-REACT Quick Map
, the impact craterlet of Apollo 14's S-IVB stage is detectable at
LON: -26.032, LAT: -8.18
Jul 3, 2011
- The impact-craterlet of Ranger 7 (also in Mare Cognitum) is also described and depicted in APOLLO OVER THE MOON (Craters,
), Figure 122.
- The system of two hillocks (large and small one) north of Ranger 7's impact site is described and depicted in Chapter 4: The Maria (
), Figure 69.
- The dark ejectablanket of Apollo 14's impacted S-IVB stage is also seen on
Lunar Topographic Ortophotomap 76-D1
(8°10' South/ 333°57')(26°03' West). Research: Danny Caes.
- On orbital image
, which is included in the book FULL MOON by Michael Light and Andrew Chaikin (Plate 25), is the dark ejectablanket of Apollo 14's impacted S-IVB stage also detectable! You need a good magnifying glass and the exact location of the ejectablanket, via LTO map 76-D1. Believe it or not, Danny Caes detected the ejectablanket on the printed version of that photograph in FULL MOON!
: "Sea that has become known".
Ranger VII impact site.
Name proposed by
Gerard P. Kuiper
who was a Ranger PI (see also E.A.Whitaker's
Mapping and Naming the Moon
, page 174: "Kuiper suggested a choice between
. After considerable discussion, the second of these (
the Known Sea
The Sea That Has Become Known
) received the vote").
In the western part of
is a wrinkle ridge which was once called the
by Johann Nepomuk Krieger and Rudolf Konig.
Another interesting fact is the close proximity of Apollo 14's S-IVB impact area near Krieger's
and the bowl-shaped crater
Bugiolacchi, R, PD Spudis & J Guest (2004) Lava flows in Mare Nubium and Mare Cognitum.
Lunar & Planet. Sci. 35, 1507
Hiesinger, HH, JW Head, U Wolfe, R Jaumann & G Neukum (2003) Ages and stratigraphy of mare basalts in Oceanus Procellarum, Mare Nubium, Mare Cognitum, and Mare Imbrium.
J. Geophys. Res. 108, E7, 5065, doi:10.1029/2002JE001985, 2003
Krieger's and Konig's "Jekaterinburg Damm": MAPPING AND NAMING THE MOON, Ewen A. Whitaker (pages 164 and 226).
APOLLO OVER THE MOON; A VIEW FROM ORBIT,
Chapter 2: Regional views
, Figure 26. Chapter 4: The Maria (
), Figure 91.
THE MOON CLOSE-UP (Ranger 7), by Eugene M. Shoemaker (NATIONAL GEOGRAPHIC november 1964, pages 690 to 707).
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