Project Twinkle Final Report

Brief

Established in 1949 under AFCRL following a Los Alamos conference that alarmed security agencies, Project Twinkle deployed Askania photo theodolites, spectrographic cameras, and radio spectrum analyzers near Holloman AFB and Las Cruces to investigate recurring green fireball sightings concentrated over Los Alamos, Sandia, and White Sands. Author L. Elterman's report documents that contractor Land-Air produced no confirmatory instrumental data over a year of active monitoring, that the 17th OSI District at Kirtland AFB was still receiving sighting reports at one to two per month, and that Holloman AFB had already unilaterally reduced the project to an unofficial stand-by status. Dr. Lincoln La Paz, the primary scientific consultant — who personally observed the phenomena — concluded that the objects' post-1947 origin and peculiar trajectories disqualified a natural explanation and stated that if they were not of U.S. military origin they constituted 'a matter of serious concern.' The report recommends no further fiscal expenditure while conceding that 'the overall picture... does not permit a conclusive opinion.'

Metadata

Agency

USAF / Cambridge Research Laboratories

Release

1951-11-27

Type

PDF • .pdf

Length

34 pages

Classification

UNCLASSIFIED

Programs

Project Twinkle, Project Grudge, Project Snook

Tags

green fireball, optical tracking, New Mexico, 1947-1951, Project Twinkle, Project Grudge, Los Alamos, Holloman AFB, Kirtland AFB, White Sands

Key points

• Project Twinkle was established in 1949 under AFCRL to instrumentally investigate green fireball sightings concentrated over northern New Mexico, using Askania photo theodolites, spectrographic cameras with diffraction gratings, and radio spectrum analysis covering 500 kc to 4000 mc — the last provided by the Signal Corps.p.15
• The 17th OSI District (Kirtland AFB) continued receiving reports of strange aerial phenomena at a rate of once or twice a month through August 1951, with most reports originating from Los Alamos personnel, though 'little attention was being given to this matter.'p.3
• Holloman AFB commander Col. Daynes concluded there was no longer justification for allocating funds and reduced the project to an unofficial stand-by status, assigning a single officer — Major Edward A. Doty — to collect incoming reports and maintain liaison with OSI.p.5
• Dr. Lincoln La Paz, who had personally and independently observed the green fireballs, concluded that their post-1947 origin and peculiar trajectories did not permit them to be classed as natural phenomena, and expressed the opinion they might be of U.S. military origin — or, if not, 'a matter of serious concern.'p.6
• Clyde Tombaugh, discoverer of Pluto and then active at White Sands, stated he had never observed an unexplainable aerial object despite continuous and extensive sky observations; Fred Whipple's Schmidt camera meteor photographs from 35 nights of reported sightings similarly revealed no unusual sky phenomena.p.4
• Of 72 reported observations analyzed by Dr. Whipple, 45 occurred when the moon was up and 27 when it was down, with a concentration at the first quarter — indicating a statistical correlation with the presence of moonlight.p.7
• A September 1950 AFCRL status letter noted it was 'significant that fire balls have ceased abruptly as soon as a systematic watch was set up,' and documented 'considerable doubt in the minds of some of the project personnel that this is a natural phenomenon.'p.14
• The November 1949 Los Alamos conference — attended by Dr. Joseph Kaplan officially representing the USAF Scientific Advisory Board — concluded that existing data was insufficient and that instrumental observations (photographs, triangulation, spectroscopic) were essential.p.19
• The report's primary recommendation is that no further fiscal expenditure be made, prompted by fruitless expenditure, uncertainty about the objects' existence, and the Holloman stand-by posture; a secondary recommendation proposes leveraging Dr. Whipple's incoming GRD-funded Schmidt cameras to passively screen meteor film for aerial object evidence.p.9
• The December 1951 transmittal letter recommended declassification of the final report 'in view of the fact that nothing of a security nature has been discovered,' even as the underlying phenomena remained formally unidentified.p.12

Most interesting

• Clyde Tombaugh — the astronomer who discovered Pluto and was then stationed at White Sands — reported zero anomalous aerial objects despite years of continuous, expert sky observation, making him one of the most credentialed negative witnesses in any government UAP record.
• Dr. Lincoln La Paz considered the fireballs' post-1947 debut as itself disqualifying for a natural explanation. His framing — either a U.S. classified program or something of serious concern — was the binary the report ultimately left unresolved.
• An assistant to Major Doty, amateur astronomer Mr. Wildenberg, described a case in which an excited acquaintance was pacified when a strange object he had reported resolved into an eagle under telescope magnification — a data-quality baseline the investigators had to factor against every sighting report.
• A 12 January 1951 report from ten Los Alamos employees described a tear-shaped object with a small tail, very bright, that descended slowly and lit the sky for approximately one second — a multi-witness, high-detail event that the instrumental program nonetheless failed to capture.
• Fred Whipple's Schmidt cameras, sensitive enough to photograph meteors, were operated specifically on 35 nights when observations were reported and yielded zero anomalous detections — the clearest statement in the record that the phenomena, whatever it was, did not respond predictably to systematic optical surveillance.
• Project Snook — a classified General Mills balloon program — was actively flying from Holloman AFB during the same period, confirming that undisclosed aerial programs shared the airspace with the green fireball sightings, complicating attribution throughout.
• A 7 June 1951 report from a Los Alamos employee described a pointed cylinder in vertical position with cloth-like construction that fell into a canyon at 11:10 A.M.; a search party dispatched to recover it found neither the object nor any remains.
• Dr. Joseph Kaplan, officially representing the USAF Scientific Advisory Board at the November 1949 Los Alamos conference, planned to brief the full Board at its next meeting and recommend a formal investigation — evidence the green fireball question reached the Air Force's highest scientific advisory tier from the project's outset.