TECHNICAL
REPORT
■
NASA TR R-277
\s%
CHRONOLOGICAL CATALOG
OF REPORTED LUNAR EVENTS
by
Barbara M. Middlehurst
University of Arizona
Jaylee M. Burley
Goddard Space Flight Center
Patrick Moore
Armagh Planetarium
and
Barbara L. Welther
Smithsonian Astrophysical Observatory
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
WASHINGTON, D. C.
JULY 1968
NASA TR R-277
CHRONOLOGICAL CATALOG OF REPORTED LUNAR EVENTS
By
Barbara M. Middlehurst
University of Arizona
Tucson, Ariz.
Jaylee M. Burley
Goddard Space Flight Center
Greenbelt, Md.
Patrick Moore
Armagh Planetarium
Armagh, Northern Ireland
and
Barbara L. Welther
Smithsonian Astrophysical Observatory
Cambridge, Mass.
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
For sole by the Clearinghouse for Federal Scientific and Technical Information
Springfield, Virginia 22151 - CFSTI price $3.00
ABSTRACT
A catalog of reports of lunar events, or temporary changes
on the moon, has been compiled based on literature covering
more than four centuries. In most cases, the original refer-
ence has been consulted; Houzeau and Lancaster's Bibliographie
General d'Astronomie and the Astronomischer Jahresbericht
were useful secondary sources. Each entry includes a brief
description and date of the observation, the name of the ob-
servers), where these are known, and the reference.
11
CONTENTS
INTRODUCTION 1
DESCRIPTION OF CATALOG 1
REPORTS OMITTED FROM THE CATALOG 2
ACKNOWLEDGMENTS 3
CHRONOLOGICAL CATALOG OF REPORTED
LUNAR EVENTS 5
REFERENCES 45
in
Frontispiece-Topographical distribution of reported lunar event sites indicated by stars
[After Middlehurst and Moore, 1967, Science 755, 449.]
IV
CHRONOLOGICAL CATALOG OF REPORTED LUNAR EVENTS
by
Barbara M. Middlehurst,* Jaylee M. Burley, Patrick Moore/
and Barbara L. Welther*
INTRODUCTION
A catalog of reports of lunar events, or temporary changes on the moon, has been compiled
based on literature covering more than four centuries. In the majority of cases the original refer-
ence has been consulted; secondary sources such as the new (1964) edition of Houzeau and Lan-
caster's Bibliographie General d'Astronomie and the Astronomischer Jahresbericht were also
used. Each entry includes a brief description and date of the observation, the name of the ob-
servers), where these are known, and the reference. The purpose of this catalog is to provide a
listing of historical and modern records that may be useful in investigations of possible activity
on the moon.
DESCRIPTION OF THE CATALOG
A lunar event is defined here as a temporary change, other than that due merely to conditions
of illumination, in the appearance of a lunar feature involving a limited area, generally a few
kilometers in dimension. Reports of observations of temporary bright spots, as well as veils, ob-
scurations, and brightening of the floors of craters and other small areas have been included. No
reports of apparently long-term changes are given; many of these have been reported for sites
such as Messier, Linne, and Bartlett, but in most cases, the evidence is not conclusive for real
changes, as it involved conflicting reports of the craters' appearances over periods of years,
rather than changes actually in progress.
The catalog contains all information available to us through October 1967; many of the reports
listed are taken from publications that are not now generally available. Column 1 gives a running
number, column 2 the date of the occurrence, Gregorian except for the first entry which predates
•Lunar and Planetary Laboratory, University of Arizona, Tucson, Arizona.
tArmagh Planetarium, Armagh, Northern Ireland.
tSmithsonian Asttophysical Observatory, Cambridge, Massachusetts.
the use of the Gregorian calendar* and the time at 0° longitude except where otherwise noted,
column 3 the site and duration of the event, column 4 a short description of the phenomenon, column
5 the observer, and column 6 the reference. The references are given alphabetically following the
catalog. Where permanent records (e.g., photographs, spectra, or photometric or spectrometric
records) exist, a footnote is given.
Due to the form of the data presentation the maximum duration of the changes as listed covers
a few hours only; nevertheless, it may not properly represent the total period of activity in the
site. Many cases of reports for the same site on consecutive or nearly consecutive nights are
given, and weather and other factors may have limited the observing period within a single night.
Throughout the catalog the use of the terms "east" and "west" follows the convention adopted
by the International Astronomical Union (IAU) in 1961 in which the classical, or astronomical,
"east" was changed to the astronautical "west", which is in agreement with ordinary terrestrial
mapping with east at right and west at left.
As far as possible, we eliminated reports of events that, for one reason or another (e.g., pos-
sibly because of special lighting effects, multiple reflections, and changes of appearance caused
by libration), are considered to be spurious. Reports of this type are discussed in the following
section. In a large number of the historical cases, the high stature of the observer as a scientist
inspires confidence in the reliability of the report and, for the rest, we saw no reason to dismiss
the observation except in the cases listed in the next section. Almost certainly some doubtful
cases remain listed in the catalog. However, their distribution with respect to almost any non-
observational lunar variable is probably random, and we believe that statistically they are
unimportant.
The fraction of past events which is recorded in the available literature is difficult to assess.
Over the years, interest in lunar matters, and particularly in changes and events, has waxed and
waned. Wars have intervened, and bad weather cycles have undoubtedly reduced the amount of ob-
serving at times. The number of observed lunar events is influenced by many other factors, such
as the light-gathering power and resolution of the telescope used, the amount of time devoted to
observation, and the skill and experience of the observers. It is notable that a marked increase in
the frequency of the reports occurs from 1783 to 1800 following Herschel's observations of "lunar
volcanoes" on May 4, 1783. This increase is almost certainly due to the interest generated among
astronomers in England, France, and Germany. The gap between 1800 and 1821 correlates with
unrest in Europe where most astronomers of that period lived. In 1813 the Napoleonic armies
returning from Moscow overran and destroyed Schroter's observatory, home, and many of his
later manuscripts. The time was a difficult one for science, and few advances in astronomy were
made.
Reports of dark-side events are more frequent among the earlier observations, when the light-
gathering power of most telescopes was relatively small and the field often included the image of
"Adopted in 1582 in Catholic countries, but not until 1752 in England and net colonies, and in 1923 in Russia and othet Eastern
Orthodox countries.
the whole moon. Operation Moon Blink (described elsewhere, e.g., Association of Lunar and
Planetary Observers (ALPO) reports) and similar undertakings in other countries helped increase
the frequency of reports of lunar events during the last few years. The frontispiece shows the
topographical distribution of sites of reported lunar events.
REPORTS OMITTED FROM THE CATALOG
We attempted to eliminate all doubtful reports from this catalog. Less than full realization
by the observers of the effects of changing conditions of illumination and other factors may have
resulted in erroneous reports. Hazards of illumination include earthshine (strongest during the
first and last three days of a lunation), sunshine on peaks just beyond the terminator, differences
in albedo and color in small regions, and multiple reflections from crater walls. Careless re-
porting has been discovered in one case only (Hammes 1878, see below).
The following records are reports in which special appearances may be due to unusual light-
ing conditions or other temporary effects external to the moon, or which are unacceptable for
other reasons. These reports are not included in the catalog.
1789 July 30. J. H. Schroter (1791, Selenotopographische Fragmente) "soon after sun-
rise" saw a kind of ferment on the floor of Plato which clearly resembled a kind of twilight.
1856 April 8, and 1860 April 24. J. Schmidt (1879, Vierteljahrschrift fiir Astronomie, 14,
265) noted weak glows in the crater Boussingault, but he doubted that these were more than
sunlight on the walls re- reflected from the floor.
1878 November 12, 8:30 local time. John Hammes and friends in Iowa reported seeing
a lunar "volcano." Correspondence in Scientific American (Dec. 21, 1878, 39, 385) includes
drawings, an identification by Admiral Rogers of the supposed location, and a certification of
John Hammes' respectability and good standing by the Mayor and three other citizens of
Koekuk, Iowa. On investigation, it became clear that some of Hammes' details were incorrect,
and since his drawings showed such poor detail, the site identification is questionable.
1899 August 29. P. Fauth (1899, Astr. Nach., 151, 219) noted that the inner parts of
Copernicus glowed in weak phosphorescent light though not directly lighted by the sun. The
observer noted, however, that the effect was probably due to multiple reflection, as the sun
was then shining on the walls of the crater.
1909 January 24 and 25. Krebs (1909, Astr. Nach., 181, 45) and Nicolis noted that the
non-illuminated part of the moon glowed red. These observations may have been due to special
effects in the earth's atmosphere. Some eclipse reports originally included have been omitted
from the list for similar reasons. Only where the observers described clearly bounded bright
areas or rapid changes in brightness have eclipse observations been listed.
1964 - . Where the observations record progressive changes (on a number of occasions)
by a succession of observers, apparently without adequate checks on subjectiveness, we felt
sufficient doubt of the reality of a lunar event to omit the report.
In spite of the care taken, we may have wrongly included (or excluded) a number of items, but
we believe that the total of these is quite small. For additional evidence in regard to the list of
reported events, the following critical discussions and references are given:
Burley, J. M., and Middlehurst, B. M., 1966, "Apparent Lunar Activity: Historical Review,"
Proc. Nat. Acad. Sci., 55, No. 5, 1007-1011.
Chapman, W. B., 1967, "Tidal Influences at the Lunar Crater Aristarchus," J. Geophys.Res., 72,
No. 24, 6293-6298.
Middlehurst, B. M., and Moore, P. A., 1967, "Topographical Distribution of Lunar Transient
Phenomena," Science, 155, No. 3761, 449-451.
Middlehurst, B. M., 1967, "An Analysis of Lunar Events," Reviews of Geophysics, 5, No. 2,
173-189.
Middlehurst, B. M., 1967, "A Note on Lunar Transient Phenomena," Icarus, 6, No. 1, 140-142.
ACKNOWLEDGMENTS
We wish to record with gratitude help given by Miss C. Botley and others in locating many old
journals and the contributions of data by Drs. J. Larink, J. A. O'Keefe, P. Treanor, Mrs. W.
Cameron and many others. Mr. E. Whitaker kindly checked the evaluation of lighting conditions.
Thanks are due for the kindness that made many items freely available for checking, especially
in the libraries of Harvard Observatory, Kitt Peak National Observatory, and the Royal Astronomi-
cal Society. The support of the National Science Foundation through Grants GP-5940 and GP-6709
is gratefully acknowledged by B. M. Middlehurst. Mrs. Betty Fink assisted in the library search,
in checking references and in preparing the manuscript for publication.
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National Aeronautics and Space Administration
Greenbelt, Maryland, November 1, 1967
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