Within Blue Book
Did Two Terre Haute Witnesses See One Object?
Two aviation witnesses reported silver objects minutes apart, but uncertain geometry prevented a firm link or identification.
On this page
- The airport communicator and pilot reports
- Why investigators tested a weather balloon explanation
- Why the two sightings could not be reliably connected
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Introduction
On 9 October 1951, two aviation-related witnesses reported unusual silver objects within minutes of one another near Terre Haute, Indiana. At first glance the reports seemed potentially connected: both involved experienced observers, both described bright metallic-looking objects in daylight, and the sightings occurred only a few minutes apart in the same general region. Yet the case became notable in Project Blue Book records not because investigators solved it, but because they could not confidently determine whether the two witnesses had even seen the same thing. The resulting investigation, including an experimental weather-balloon test, illustrates both the strengths and limitations of early Air Force UFO inquiries. Rather than producing a dramatic conclusion, the Terre Haute case became an example of how uncertainty itself could prevent a firm identification.[Wikimedia Commons]upload.wikimedia.orgProject Blue Book, BBA PBSR1 300Wikimedia CommonsThe Project Blue Book ArchiveOn 9 October 1951 at 1342 CST, a CAA Chief Aircraft Connaunicator observed a silver object…
Did Two Terre Haute Witnesses See One Object?
The incident began at 1:42 p.m. Central Standard Time at Hulman Municipal Airport in Terre Haute. Roy Messmore, the Civil Aeronautics Administration (CAA) chief aircraft communicator, reported seeing a round silver object pass directly overhead. According to the official summary, the object crossed the sky rapidly and reached the horizon in roughly fifteen seconds. Messmore was an aviation professional accustomed to observing aircraft and weather conditions, which gave his report greater weight than an ordinary casual observation.[wikimedia.org]upload.wikimedia.orgProject Blue Book, BBA PBSR1 300Wikimedia CommonsThe Project Blue Book ArchiveOn 9 October 1951 at 1342 CST, a CAA Chief Aircraft Connaunicator observed a silver object…
Only minutes later, another aviation witness reported a seemingly similar object. A pilot flying between Indiana and Illinois radioed that he had seen a large silvery object near Paris, Illinois, northwest of Terre Haute. In later descriptions of the case, the pilot said the object resembled a flattened orange and appeared nearly motionless relative to his aircraft before he turned to obtain a better view.[Project Gutenberg]gutenberg.orgProject Gutenberg The Report on Unidentified Flying ObjectsProject Blue Book published a classified monthly report on UFO activity…. A matter of minutes after the sighting a pilot radioed Terre…
The timing immediately attracted attention. Two trained observers had reported bright silver aerial objects only a few minutes apart. Within the framework of early Blue Book investigations, this raised the possibility that both men had observed the same target from different positions. If true, the paired sightings might have provided a stronger basis for estimating the object’s location, altitude and movement than either report could provide on its own.[Internet Sacred Text Archive]sacred-texts.comInternet Sacred Text ArchiveThe Report on Unidentified Flying Objects: Chapter Nine……The report from Terre Haute said that on Octob…
The Airport Communicator and Pilot Reports
Although the reports appeared similar, important differences emerged when investigators examined them more closely.
Messmore’s observation suggested a fast-moving object travelling across the sky. His description emphasised rapid passage overhead and disappearance toward the horizon. The pilot’s account, by contrast, described an object that initially appeared almost stationary before he manoeuvred his aircraft to look at it more carefully. The shapes described were not identical either: one report referred to a round silver object, while the pilot compared what he saw to a flattened orange.[wikimedia.org]upload.wikimedia.orgProject Blue Book, BBA PBSR1 300Wikimedia CommonsThe Project Blue Book ArchiveOn 9 October 1951 at 1342 CST, a CAA Chief Aircraft Connaunicator observed a silver object…
These differences did not necessarily mean the reports were unrelated. Perspective effects can make the same object appear very different to observers at separate locations. A distant object moving toward or away from one witness may appear nearly stationary, while another observer sees obvious motion across the sky. Investigators therefore had to determine whether geometry, distance and viewing angle could reconcile the two descriptions.[Internet Sacred Text Archive]sacred-texts.comInternet Sacred Text ArchiveThe Report on Unidentified Flying Objects: Chapter Nine……The report from Terre Haute said that on Octob…
That task proved difficult because the available observations contained too few precise measurements. Neither witness could provide enough information to establish the object’s altitude, exact distance or track with confidence. Without those figures, connecting the reports became largely a matter of inference rather than calculation.[Internet Sacred Text Archive]sacred-texts.comInternet Sacred Text ArchiveThe Report on Unidentified Flying Objects: Chapter Nine……The report from Terre Haute said that on Octob…
Why Investigators Tested a Weather-Balloon Explanation
One of the most interesting aspects of the Terre Haute case was the decision to test a weather-balloon hypothesis rather than simply assume one.
Investigators recognised that bright metallic weather balloons frequently generated UFO reports during the late 1940s and early 1950s. Sunlit balloons could appear as brilliant silver objects, sometimes seeming motionless at high altitude and at other times appearing to move rapidly because of changing observer position and atmospheric conditions. Because both Terre Haute reports involved silver objects seen in daylight, a balloon was an obvious candidate explanation.[Internet Sacred Text Archive]sacred-texts.comInternet Sacred Text ArchiveThe Report on Unidentified Flying Objects: Chapter Nine……The report from Terre Haute said that on Octob…
Instead of relying solely on paperwork, investigators reportedly conducted a practical comparison by launching a weather balloon under similar conditions. The purpose was to determine whether observers might perceive a balloon in a way that matched the descriptions given by the airport communicator and the pilot. Such field tests reflected the more technical approach that Air Force investigators were beginning to adopt in 1951, when Blue Book sought greater emphasis on observational data and verification.[Internet Sacred Text Archive]sacred-texts.comInternet Sacred Text ArchiveThe Report on Unidentified Flying Objects: Chapter Nine……The report from Terre Haute said that on Octob…
The balloon experiment produced mixed results. It demonstrated that a weather balloon could resemble a bright silver object in the daytime sky. However, it did not conclusively reproduce all aspects of the two reports. The test therefore failed to provide the clear answer investigators hoped for. Rather than proving the sightings were balloons, it merely showed that a balloon explanation remained plausible.[Internet Sacred Text Archive]sacred-texts.comInternet Sacred Text ArchiveThe Report on Unidentified Flying Objects: Chapter Nine……The report from Terre Haute said that on Octob…
Why the Two Sightings Could Not Be Reliably Connected
The central problem was geometry.
To establish that both witnesses had seen the same object, investigators needed to reconstruct where the object would have been at specific moments and whether the reported directions matched. The available information was too incomplete to do this with confidence. The timing suggested a possible connection, but timing alone was not enough.[Internet Sacred Text Archive]sacred-texts.comInternet Sacred Text ArchiveThe Report on Unidentified Flying Objects: Chapter Nine……The report from Terre Haute said that on Octob…
Several uncertainties complicated the analysis:
- The exact positions and viewing angles of the witnesses were not sufficient to triangulate the object’s location.
- The reported motion differed between the two accounts.
- The estimated shapes were not identical.
- The balloon test demonstrated a possible conventional explanation but did not uniquely fit both observations.
- No radar confirmation, photographs or additional independent measurements were available.[Internet Sacred Text Archive]sacred-texts.comInternet Sacred Text ArchiveThe Report on Unidentified Flying Objects: Chapter Nine……The report from Terre Haute said that on Octob…
As a result, investigators could neither prove that the reports referred to one object nor demonstrate that they involved separate objects. The case remained trapped between those possibilities.[Internet Sacred Text Archive]sacred-texts.comInternet Sacred Text ArchiveThe Report on Unidentified Flying Objects: Chapter Nine……The report from Terre Haute said that on Octob…
What the Case Meant for Project Blue Book’s Indiana Files
The Terre Haute reports occupy an interesting place in Indiana’s Blue Book history because they illustrate how an apparently promising multiple-witness event could still resist firm conclusions.
For several years the Terre Haute sighting appeared among Blue Book’s unresolved cases, and later catalogues continued to note the difficulty of explaining it conclusively. At the same time, the case never provided strong evidence for anything extraordinary. The witnesses were credible, but the data were sparse. The balloon hypothesis remained plausible, yet it could not be demonstrated beyond doubt.[patrickgross.org]ufologie.patrickgross.org9, 1951, Terre Haute, Indiana. 1:42 p.m: Witness: CAA Chief Aircraft Communicator Roy Messmore at Hulman Municipal Airport. One round…
This places the incident in a category that appears repeatedly throughout Indiana’s official UFO records: reports that were not dismissed as obvious mistakes, but also lacked the information needed for a confident identification. In that sense, the Terre Haute case is less a mystery about an unknown object than a lesson in the limits of investigation. The key question was never simply what was seen. It was whether the available evidence was sufficient to connect two observations into a single event. Project Blue Book’s investigators ultimately concluded that it was not.[Internet Sacred Text Archive]sacred-texts.comInternet Sacred Text ArchiveThe Report on Unidentified Flying Objects: Chapter Nine……The report from Terre Haute said that on Octob…
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Endnotes
1.
Source: upload.wikimedia.org
Title: Project Blue Book, BBA PBSR1 300
Link:https://upload.wikimedia.org/wikipedia/commons/3/3b/Project_Blue_Book%2C_BBA-PBSR1-300.pdf
Source snippet
Wikimedia CommonsThe Project Blue Book ArchiveOn 9 October 1951 at 1342 CST, a CAA Chief Aircraft Connaunicator observed a silver object...
Published: October 1951
2.
Source: ufologie.patrickgross.org
Link:https://www.ufologie.patrickgross.org/htm/bluebooku51.htm
Source snippet
9, 1951, Terre Haute, Indiana. 1:42 p.m: Witness: CAA Chief Aircraft Communicator Roy Messmore at Hulman Municipal Airport. One round...
3.
Source: nicap.org
Link:https://www.nicap.org/bluebook/unknowns.htm
Source snippet
The Project Bluebook "Unknowns"Oct. 9, 1951; Terre Haute, Indiana. 1:42 p.m. Witness: CAA Chief Aircraft Communicator Roy Messmore a...
4.
Source: gutenberg.org
Title: Project Gutenberg The Report on Unidentified Flying Objects
Link:https://www.gutenberg.org/cache/epub/17346/pg17346-images.html
Source snippet
Project Blue Book published a classified monthly report on UFO activity.... A matter of minutes after the sighting a pilot radioed Terre...
5.
Source: upload.wikimedia.org
Title: Project Blue Book, BBA PBSR2 300
Link:https://upload.wikimedia.org/wikipedia/commons/e/ea/Project_Blue_Book%2C_BBA-PBSR2-300.pdf
6.
Source: upload.wikimedia.org
Title: Project Blue Book, BBA PBSR10 300
Link:https://upload.wikimedia.org/wikipedia/commons/5/54/Project_Blue_Book%2C_BBA-PBSR10-300.pdf
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Source: gutenberg.org
Link:https://www.gutenberg.org/ebooks/17346.epub.images
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Source: archive.org
Title: Full text of “The Hynek UFO Report”The Blue Book
Link:https://archive.org/stream/TheHynekUFOReport/The_Hynek_UFO_Report_djvu.txt
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Source: archive.org
Title: Brad Sparks Comprehensive Catalog of 1,600 Project Blue Book UFO Unknowns
Link:https://archive.org/download/BernardSieglerTechnicsAndTime1TheFaultOfEpimetheus/Brad%20Sparks%20-%20Comprehensive%20Catalog%20of%201%2C600%20Project%20Blue%20Book%20UFO%20Unknowns.pdf
10.
Source: sacred-texts.com
Link:https://sacred-texts.com/ufo/rufo/rufo11.htm
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Internet Sacred Text ArchiveThe Report on Unidentified Flying Objects: Chapter Nine......The report from Terre Haute said that on Octob...
11.
Source: archives.gov
Title: Project BLUE BOOK
Link:https://www.archives.gov/research/military/air-force/ufos
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Source: Wikipedia
Title: Project Blue Book
Link:https://en.wikipedia.org/wiki/Project_Blue_Book
Additional References
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Project Blue Book Part 1 (UFO Reports)6 Aug 2020 — In 1951, UFO investigations continued under the newly named Project Blue Book. The par...
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Rob MercerTerre Haute, Indiana, 9 October 195lz 1342 CST. On 9 October. 1951 at 1342 CST, a CAA chief aircraft corr~unicator observed a s...
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