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Fracastorius - and
name; original IAU name:
Lat: 21.5°S, Long: 33.2°E, Diam: 112 km, Depth: 1.48 km,
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Fracastorius - and Romana (Fracastorius D)
at the southern part of
. The more-or-less triangle shaped crater at the western part of the rim of
was once called
(nowadays officially known as
was one of the discontinued names from H.P.Wilkins and P.Moore (see their book
The recent versions of the
moonmap still show several examples of these discontinued names.
is one of them.
LPOD Photo Gallery
Lunar Orbiter Images
was also captured on several oblique south-looking
camera photographs made during the mission of Apollo 16, such as frame
, in which
is noticeable near the central part of the curved horizon.
Research Danny Caes
FRACASTORIUS.--This great bay or inflexion at the extreme S. end of the
, about 60 miles in diameter, is one of the largest and most suggestive examples of a partially destroyed formation to be found on the visible surface. The E. section of the rampart is practically complete and unbroken, rising at one peak to a height of 6,000 feet above the interior. It is very broad at its S. end, and its inner slope descends with a gentle gradient to the floor. Towards the N., however, it rapidly decreases in width, but apparently not in altitude, till near its bright pointed N. extremity. Under a low sun, some long deformed crateriform depressions may be seen on the slope, and a bright little crater on the crest of the border near its N. end. The southern rampart is broken by three large craters, and a fine valley, running some distance in a S. direction, which diminishes gradually in width till it ultimately resembles a cleft, and terminates at a small crater. The W. border is very lofty and irregular, rising at the N. corner of the large triangular formation, which is such a prominent feature upon it, to a height of 7,000 feet, and at a point on the S.W. to considerably more than 8,000 feet above the floor. N. of the former peak it becomes much lower and narrower, and is finally only represented by a very attenuated strip of wall, hardly more prominent than the brighter portions of the border of
at sunrise, terminating at an obscure semi-ring-plain. Between this and the pointed N. termination of the E. border there is a wide gap, open to the north for a space of about 30 miles, appearing, except under very oblique illumination, as smooth and as devoid of detail as the grey surface of the Mare Nectaris itself. If, however, this interval is observed at sunrise or sunset, it is seen to be not quite so structureless as it appears under different conditions, for a number of mounds and large humpy swellings, with low hills and craterlets, extend across it, and occupy a position which we are justified in regarding as the site of a section of the rampart, which, from some cause or other, has been completely destroyed and overlaid with the material, whatever this may be, of the
. The floor of Fracastorius is, as regards the light streaks and other features upon it, only second in interest to those of
, and will repay systematic observation. Between thirty and forty light spots and craters have been recorded on its surface, most of them, as in these formations, being situated either on or at the edges of the light streaks. On the higher portion of the interior (near the centre) is a curious object consisting apparently of four light spots, arranged in a square, with a craterlet in the middle, all of which undergo (as I have pointed out elsewhere) notable changes of aspect under different phases. There are at least two distinct clefts on the floor, one running from the E. wall towards the centre, and another on the S.W. side of the interior. The last throws out two branches towards the S.E.
Depth data from
Kurt Fisher database
Westfall, 2000: 1.48 km
Cherrington, 1969: 1.76 km
Central peak height
The most distinct interior peak (Xi 0.509, Eta -0.363) is conical and has a height of 0.6 km
Satellite craters Fracastorius A, B, N and T are on the
ALPO list of banded craters
Fracastorius B central peak height
: 0.9 km
According to Patrick Moore's
New Guide to the Moon
(1976), page 289, there should be a darkish streak across the floor of
which is of a slightly reddish hue, and is detectable with a moonblink device.
May 21, 2012
Girolamo Fracastoro (
) (1478-August 8, 1553) was an Italian physician, scholar (in mathematics, geography and astronomy), poet and atomist.
by Hugh Percy Wilkins and Antonio Paluzie-Borrell, but the I.A.U. did not accept that name.
Romana (Antonio Romana) was a contemporary Spanish astronomer.
was once known as
(Spiridion Voutzinas). This was one of Felix Chemla Lamech's new names, but the I.A.U. did not accept that name.
: Ewen A. Whitaker and Danny Caes (August 2003, mail correspondence).
appears on a chart in Chemla-Lamech's
Etude Monographique des plus grandes Formations Lunaires
Sep 15, 2007
Was there once a
in the neighbourhood of
? (see page 298 of W.R.Birt's
Lunar Objects Suitable for Observations, December 1879
May 28, 2013
Back to a Fractured Floor
Fractured, Tilted, and Flooded
: Crater with subsided & fractured floor.
Fracastorius D ("Romana"): THE MOON by H.P.Wilkins and P.Moore.
Lamech's "Voutzinas": Mapping and Naming the Moon; a history of lunar cartography and nomenclature (Ewen A. Whitaker).
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