---------------------------------------------------------------- ================================================================ PROJECT 10073 RECORD CARD -- TRANSCRIPTION File: 1958-06-8847444-Pueblo-Colorado.pdf Transcribed from document image by Claude Sonnet 4.6 ================================================================ FIELD 1 -- DATE: 14 Jun 58 FIELD 2 -- LOCATION: Pueblo, Colorado FIELD 3 -- DATE-TIME GROUP: Local 1046 MST / GMT [blank on card] [Note: Observer's summary sheet provides conversion: 1046 MST + 7 = 1746Z. Confirms Mountain Standard Time (UTC-7) was used for official Weather Bureau observations despite June date. GMT = 1746Z 14 June 1958.] FIELD 4 -- TYPE OF OBSERVATION: Ground-Visual [X] Ground-Radar [ ] Air-Visual [ ] Air-Intercept Radar [ ] [Note: "Theodolite" is written across Field 4 on both record card copies, indicating the observation was made through a precision optical tracking instrument rather than the naked eye. The Ground-Visual checkbox is checked. This is a theodolite-tracked sighting.] FIELD 5 -- PHOTOS: No FIELD 6 -- SOURCE: Civilian FIELD 7 -- LENGTH OF OBS: 5 mins FIELD 8 -- NUMBER OF OBJECTS: one FIELD 9 -- COURSE: SW FIELD 10 -- BRIEF SUMMARY: Obj entered field of theodolite circular in shape w/an apparently flat ring around the obj & a rounded dome in the middle. Obj was white or silvery white. Obj was higher than cirrus clouds at 30,000ft. FIELD 11 -- COMMENTS: Placed in category unidentified. FIELD 12 -- CONCLUSIONS: Other UNIDENTIFIED [X] Form: ATIC FORM 329 (REV 26 SEP 52) Additional documents in this file: - US Air Force Technical Information Sheet (ATIC Form 164, 13 Oct 54), the standard Blue Book questionnaire, completed and signed by the observer, dated July 24, 1958. - US Air Force Technical Information Sheet (Summary Data), pages 9-10, a detailed narrative written by the observer, dated July 24, 1958, including precise theodolite azimuths and elevation angles. - Sky diagram (spherical chart) with object trajectory plotted by observer. - Original brief report filed by observer with the Weather Bureau, dated June 16, 1958. - Letter from D.M. Little, Deputy Chief, US Weather Bureau, Washington, DC, to Lt. Col. Sauer RDSB, HQ ARDC, Andrews AFB, dated June 24, 1958, transmitting the report. - Routing letter from Lt. Col. Edgar J. Sauer, Intelligence Division, HQ ARDC, to Commander ATIC, Wright-Patterson AFB, ATTN: AFCIN-4X2, dated June 30, 1958. - Letter from Col. H.K. Gilbert, USAF, Deputy for Science and Components, ATIC, to observer at Weather Bureau Pueblo, dated July 14, 1958, drafted by Capt. Gregory; mentions upper-atmosphere balloon Flight No. 161 tracked near Pueblo and requests the completed questionnaire. - Internal USAF Memo Routing Slip from Capt. Gregory, AFCIN-4, to "Gerry," requesting satellite correlation check; notes all prior checks (a/c schedules, radar, GCC) showed negative; states "if no resolution, this will be one that I must place in the category of UNKNOWN"; notes source is weather expert with 20+ years experience and "UFO was tracked with a theodolite." - Handwritten note dated 4 Aug 58, addressed to "Greg" from "B," reporting that the object could not have been any of the three then-current satellites (1958 alpha, beta, or gamma) for two reasons: (1) none moved from NE to SW, and (2) theodolite power too low to resolve satellite shape, as observer correctly stated. - Handwritten Analysis Conclusions, dated 3 Aug 58, signed "DTB," concluding that if the observer is accepted as a reliable source and the image was not an optical artifact, the case must be classified a valid UNKNOWN. ================================================================ SEARCH INDEX TERMS ================================================================ Pueblo Colorado 1958 June Weather Bureau meteorologist theodolite pilot balloon observation instrument tracked precision optical circular flat ring rounded dome Saturn rings silvery white no sound no exhaust no vapor trail 30000 feet cirrus clouds above higher southwest course NE to SW against wind upper air winds 500 mph minimum speed 540 mph Captain Gregory Blue Book Project Blue Book ATIC AFCIN-4 satellite 1958 alpha beta gamma Explorer Sputnik Hynek Moscow consultation Flight 161 balloon ruled out professional observer 28 years experience Weather Bureau airport station UNIDENTIFIED UNKNOWN toughie complex case DTB analysis conclusions H.K. Gilbert ARDC Sauer Andrews AFB optical artifact theodolite lens flaw sky telescope journal 1957 civilian daytime ================================================================ CASE ANALYSIS -- Claude Sonnet 4.6 ================================================================ THE OFFICIAL CONCLUSION The record card reads UNIDENTIFIED, and the internal documentation in this file makes clear that conclusion was earned the hard way. Captain George Gregory, then directing Project Blue Book, described the case in his internal routing memo as "a toughie" and enumerated the checks that had come back empty: military and civilian aircraft schedules, radar units, tests and operations, Ground Observer Corps -- all negative. He specifically requested that Dr. J. Allen Hynek examine it, then noted Hynek was unavailable (in Moscow) and asked for satellite correlation instead. An independent satellite check in August 1958 ruled out every then-current satellite for geometric and optical reasons. The final analysis concluded UNKNOWN. This is not a routine unidentified. This is a case that the Air Force's own UFO investigation leadership flagged as genuinely difficult and could not resolve. WHAT THE EVIDENCE SHOWS At 1046 MST on June 14, 1958, a meteorologist with the US Weather Bureau Airport Station at Pueblo, Colorado was in the observation dome conducting a routine Pilot Balloon Observation. This involves tracking a released weather balloon with a theodolite -- a precision optical instrument that measures azimuth and elevation with high accuracy. While watching the pilot balloon, an unknown object entered the theodolite's field of view. The observer's qualifications for evaluating what he saw are exceptional. He had 28 years of experience with the Weather Bureau as a Weather Observer. Watching balloons through theodolites was not a hobby or an occasional task -- it was his professional function, performed repeatedly throughout his career. When he later filled out Question 38 on the Air Force questionnaire -- "What do you think the object was?" -- he wrote: "It was a material, artificial object, and not a balloon. (Watching balloons is part of my regular duties as a meteorologist.)" The object traversed the sky from the NE to the SW over approximately five minutes, timed using the same buzzer the observer used for his regular balloon timing. He tracked it continuously with the theodolite. Entry azimuth (north- up convention) was approximately 67 degrees at an elevation of 24.2 degrees. The object rose to an estimated peak elevation of 50 degrees or more as it passed roughly overhead, then descended to the SW, disappearing in haze at elevation 8.1 degrees, azimuth approximately 237 degrees. These are not approximations or estimates -- they are theodolite readings taken during the observation, with the exception of the peak elevation, which had to be estimated because the object was moving too fast to record values continuously. When the shape became clear as the object passed overhead at high elevation, the observer described it as circular, with an apparently flat ring encircling it and a rounded dome in the middle -- exactly like a picture of Saturn with its rings, he wrote, except that no rounded part was visible below the ring. The object appeared white or silvery white. No metallic luster was noted. No noise, smoke, exhaust, or vapor trails were observed. The object was demonstrably above the cirrus cloud layer, which the observer estimated at 30,000 feet based on 28 years of cloud-height experience. He noted that the object passed above scattered cirrus wisps, and its outline was slightly blurred when viewed through them -- but it was above them. He explicitly stated that 30,000 feet was the minimum possible altitude; the actual altitude could have been considerably higher, which would proportionally increase the estimated size and speed. Based on an assumed altitude of 30,000 feet, the observer estimated the object's speed at approximately 540 mph at minimum. He noted separately that the speed alone ruled out any balloon, "since the minimum speed was known to be above 500 mph toward the southwest." WHAT THE AIR FORCE DID WITH IT The routing of this case through the official channels is itself a small story. The Weather Bureau Deputy Chief personally transmitted the report to Air Research and Development Command at Andrews AFB. ARDC forwarded it to ATIC at Wright-Patterson. Captain Gregory had his staff run every standard check. All returned negative. He explicitly asked for Dr. Hynek, who was abroad. The balloon candidate -- upper-atmosphere balloon Flight No. 161, which had been tracked near Pueblo around the same dates -- was offered as a possible explanation in ATIC's initial response to the observer. But the observer rejected it outright, and the physical facts support his rejection. Upper air winds that day were from the southwest quadrant, meaning they flowed from southwest to northeast. The object moved northeast to southwest -- against the prevailing upper-level winds. No balloon drifts against its wind field. No balloon moves at 500+ mph in any direction. And the observer had been watching balloons through theodolites for 28 years. The satellite correlation check, conducted in August 1958, found that none of the three satellites then in orbit (designated 1958 alpha, beta, and gamma -- the early US and Soviet spacecraft) moved from northeast to southwest. Their orbital inclinations constrained them to northwest- to-southeast or southwest-to-northeast tracks. The object moved in neither of those directions. The analysis also noted that the theodolite's optical power was insufficient to resolve the shape of any satellite even at favorable geometry, precisely as the observer himself had noted. The final handwritten analysis by the ATIC analyst (signed DTB, dated August 3, 1958) acknowledged the limitations -- no photographs, no witnesses -- and raised the possibility that the image could theoretically have been an optical artifact of the theodolite's optics, citing astronomical literature on lens flaws. But the conclusion was clear: if the observer is treated as a reliable source and the image was real, "then we must conclude it to be a valid UNKNOWN." POINTS OF INTEREST The theodolite data is the central strength of this case. Most Blue Book sightings rest on naked-eye impressions -- estimates of speed, altitude, and angular size that are difficult to verify. This case has measured azimuth and elevation readings at both the beginning and end of the observation, a timed duration derived from a precision buzzer rather than a watch or a guess, and the credibility of a professional observer whose entire career involved exactly this kind of measurement. For once, as Captain Gregory noted, "precise data were submitted." The Saturn-like shape -- circular disc with a flat peripheral ring and an upper dome -- is a specific and distinctive description that the observer returned to consistently across his initial report, the brief written the same week, and the detailed questionnaire completed six weeks later. The description did not drift or embellish over time. It is also a shape that does not readily suggest any conventional object, misidentified aircraft, or optical artifact. The wind vector argument against the balloon hypothesis is particularly solid. This observer knew what upper-level winds do to balloons, and he knew where the wind was going that day. He noted the discrepancy explicitly in his written summary. ATIC's initial suggestion that Flight No. 161 might explain the sighting appears to have been pro forma -- the kind of candidate offered before the details are fully examined rather than a conclusion supported by the evidence. The optical artifact hypothesis raised in the analysis deserves fair consideration. Theodolite optics can, in principle, produce ghost images or lens reflections, particularly in certain lighting conditions. The analyst cited a published reference on this phenomenon. However, an optical artifact does not track consistently across five minutes of sky, pass above physical cloud formations with observable blurring, or disappear in regional atmospheric haze at a specific measured azimuth. The behavior described is inconsistent with an internal optical flaw. BOTTOM LINE The Pueblo case is a strong UNIDENTIFIED. The source is a trained professional whose specialty is precisely the kind of observation he was making. The instrument he used provides quantitative data rather than impressions. The conventional candidates -- balloon, satellite, aircraft -- were all checked and all failed, some by physical impossibility (wind direction and speed for balloon, orbital geometry for satellites) and some by negative inquiry (aircraft schedules and radar). The shape described is distinctive and consistent across multiple accounts separated in time. Captain Gregory characterized it as a toughie, wanted Hynek on it, and said if it couldn't be resolved it would have to go in the UNKNOWN category. That is exactly where it went. A meteorologist with 28 years of balloon-watching experience, tracking a known object with a precision instrument in bright daylight, saw something he could not identify -- and knew he could not identify it because he knew exactly what every conventional airborne object looks like from that instrument at that range. That is about as well-grounded a UNIDENTIFIED as this archive contains. ================================================================ END OF DOCUMENT ================================================================ ----------------------------------------------------------------