Case study · CASE-083 · Aerial luminous phenomena near atomic facilities / scientific and military investigation
New Mexico green fireballs (1948-1951)
Not assessedWhere New Mexico: Los Alamos, Sandia Base, Starvation Peak, Socorro region, Vaughn and Holloman AFBWhen 1948-12 to 1951
Case
- Overview
- From December 1948 military, security and scientific personnel reported green luminous aerial events near New Mexico atomic and military sites. Meteoriticist Lincoln LaPaz investigated and reported his own Starvation Peak sighting; Los Alamos conferences in February and October 1949 discussed the reports and recommended instrumentation, which led to the USAF Project Twinkle camera program (1950-1951). The reports and investigations are documented; the cause of the individual observations is not established.
- Investigative phases
- Dec 1948 first reports and inquiries; 1949-02-16 Los Alamos conference (reported participants included Norris Bradbury, Marshall Holloway, Fred Reines, John Manley, Edward Teller and LaPaz, with military and Sandia representatives); FBI San Antonio memorandum of 1949-03-22; July-Aug 1949 copper particle sampling by William Crozier and Ben K. Seely; 1949-10-14 second conference urging triangulation and spectroscopy; 1950-05-25 AFOSI compilation; Project Twinkle 1950-1951 (see PRG-V99-02).
- Reported phenomena
- Green or yellow-green luminous objects; LaPaz described near-instant full brightness, colour near 5200 angstroms, a nearly horizontal path, near-constant apparent angular speed, about two seconds' duration and silence. The 25 May 1950 AFOSI summary compiled 209 sightings of mixed categories (fireballs, discs, other lights) since December 1948.
- Public evidence status
- High: FBI memoranda (FBI UFO Parts 6 and 11), Sandia Base file DOW-UAP-D017 and the 1951 Twinkle final report. Moderate: witness and investigator descriptions. Low: instrumental measurements; no simultaneous camera triangulation was achieved and no authenticated fireball photograph has been identified.
- Alternative explanations / caveats
- Meteors/bolides, atmospheric effects, military tests and observational error are competing explanations, and no single explanation is assumed for all reports. LaPaz's colour and trajectory values are descriptions, not spectrometer or triangulated measurements. 209 is a reported count of mixed categories, not 209 verified anomalous objects. The copper sampling was negative or inconclusive because controls contained copper. Proximity to nuclear sites is geographic context, not proof of targeting. Keep separate from Project Grudge and from modern White Sands/Skywatcher allegations.
- Next research tasks
- Retrieve LaPaz's original Starvation Peak notes, witnesses and geometry; obtain the Feb 16 and Oct 14 1949 conference minutes and attendee lists; audit the 209-report compilation for duplicates and categories; obtain Crozier control slides, laboratory results and B-25 sample chain of custody; compare AARO's Twinkle summary dates and camera counts with the 1951 report.
- Last reviewed
- 2026-11-12
Assessment
Not yet in the Case Assessment Matrix.
Evidence (13)
- LaPaz Starvation Peak observation and first green-fireball inquiries, described in FBI memorandum of 1949-03-22 Reported
- Los Alamos conference on fireball reports (reported participants Bradbury, Holloway, Reines, Manley, Teller, LaPaz) Claim unverified
- Second Los Alamos conference urges photographic triangulation and spectroscopy Documented
- Crozier and Seely airborne copper particle sampling, Socorro region Reported
- AFOSI compilation of 209 sightings of mixed categories since Dec 1948 Reported
- Project Twinkle Askania camera operations at Vaughn and Holloman; April 27 and May 24 1950 exposures not simultaneous; Aug 30-31 reports not triangulated Reported
- FBI memorandum summarizing green-fireball reporting Unverified
- LaPaz reported seeing a yellow-green luminous object at Starvation Peak: near-instant full brightness, nearly horizontal path, about two seconds, silent DocumentedFirsthand
- LaPaz correspondence on green fireballs proposing non-meteor interpretations DisputedFirsthand
- Project Twinkle final report recommends against continued dedicated funding CorroboratedSecondhand
- Crozier copper particle sampling in Socorro region negative or inconclusive because controls contained copper ReportedSecondhand
- Seely participated in particle collection with Crozier CorroboratedSecondhand
- AFOSI summary compiles 209 sightings of mixed categories in New Mexico since Dec 1948 UnverifiedSecondhand
Documents gathered (13 lines of evidence)
- LaPaz Starvation Peak observation and first green-fireball inquiries, described in FBI memorandum of 1949-03-22 Readable here
- Los Alamos conference on fireball reports (reported participants Bradbury, Holloway, Reines, Manley, Teller, LaPaz) Readable here
- Second Los Alamos conference urges photographic triangulation and spectroscopy Readable here
- Crozier and Seely airborne copper particle sampling, Socorro region Primary record linked
- AFOSI compilation of 209 sightings of mixed categories since Dec 1948 Primary record linked
- Project Twinkle Askania camera operations at Vaughn and Holloman; April 27 and May 24 1950 exposures not simultaneous; Aug 30-31 reports not triangulated Readable here
- FBI memorandum summarizing green-fireball reporting Readable here
- LaPaz reported seeing a yellow-green luminous object at Starvation Peak: near-instant full brightness, nearly horizontal path, about two seconds, silent Readable here
- LaPaz correspondence on green fireballs proposing non-meteor interpretations Readable here
- Project Twinkle final report recommends against continued dedicated funding Readable here
- Crozier copper particle sampling in Socorro region negative or inconclusive because controls contained copper Primary record linked
- Seely participated in particle collection with Crozier Primary record linked
- AFOSI summary compiles 209 sightings of mixed categories in New Mexico since Dec 1948 Primary record linked
On the timeline (6)
- 1948-12 Green-fireball reports near New Mexico atomic sites begin; LaPaz's Starvation Peak observation Claim unverified
- 1949-02-16 Los Alamos conference on green-fireball reports Verify
- 1949-10-14 Second Los Alamos conference recommends photographic triangulation and spectroscopy Reported
- 1950-03-16 USAF directive authorizes Project Twinkle photographic monitoring Verify
- 1950-05-25 AFOSI summary compiles 209 New Mexico sightings of mixed categories since Dec 1948 Unverified
- 1951-11-27 Project Twinkle final report (L. Elterman) recommends against dedicated funding Reported