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Arecibo Wow! Ohio SETI Data

The Ohio SETI project ran from 1973 to 1998 from the Ohio State University Radio Observatory (OSURO), nicknamed Big Ear. It is the longest-running SETI project so far. The Arecibo Wow! project is transcribing and calibrating its available data from scans of the original computer printouts. The dataset included here has the famous Wow! Signal detected August 15, 1977, around 10 PM EST. It has the original data, as read from the printout, plus corrected B1950 and J2000 coordinates, MJD and LST time, observed frequencies, and flux estimates, among other variables. This reanalysis will be described in the second Arecibo Wow! paper in November 2024.

Directory Content

  • oseti_19770815_220410.jpg - scan of original Wow! Signal printout for reference
  • oseti_19770815_220410.txt - original data in TXT format (no header)
  • oseti_19770815_220410.csv - original data in CVS format (with header)
  • oseti_19770815_220410.extended.pdf - original data in PDF format plus CNT and OBJECT fields (with header)
  • oseti_19770815_220410.sav - reanalysis data in IDL Save format (description below)

Data Format

Data is saved in the IDL Save format. Use SciPy's readsave to read data into Python. FITS file will also be included.

Variable Type Content Description
OBSERVATORY STRING 'Ohio State University Radio Observatory (OSURO)' observatory name
TELESCOPE STRING 'Big Ear' telescope name
LOCATION STRING 'Delaware, Ohio' observatory location
PROJECT STRING 'Ohio SETI' project name
OBS_COORD DOUBLE Array[2] observatory coordinates
Start Date STRING '19770815' observation start date
Start Time STRING '220410' observation start time
TSYS DOUBLE 100.00000 system temperature (K)
OFREQ DOUBLE 1420.4056 observation frequency (MHz)
REFSYS STRING 'LSR' reference system
DATE STRING Array[82] date (YYYY MM DD)
RA_PRINT STRING Array[82] right ascension from printout (HH MM SS)
DC_PRINT STRING Array[82] declination from printout (DD MM)
FREQ_PRINT FLOAT Array[82] 2nd L.O. frequency from printout (MHz)
GLAT_PRINT FLOAT Array[82] galactic latitude from printout (degrees)
GLON_PRINT FLOAT Array[82] galactic longitude from printout (degrees)
ESTD_PRINT STRING Array[82] time from printout (eastern standard time)
SNR_PRINT STRING Array[50, 82] signal to noise ratio from printout (50 channels x 82 rows)
RA_1950_DEC DOUBLE Array[82] corrected right ascension B1950 FK4 (hours)
DC_1950_DEC DOUBLE Array[82] corrected declination B1950 FK4 (degrees)
RA_1950_SEX STRING Array[82] corrected right ascension B1950 FK4 (HH MM SS)
DC_1950_SEX STRING Array[82] corrected declination B1950 FK4 (DD MM SS)
RA_2000_DEC DOUBLE Array[82] corrected right ascension J2000 FK5 (hours)
DC_2000_DEC DOUBLE Array[82] corrected declination J2000 FK5 (degress)
RA_2000_SEX STRING Array[82] corrected right ascension J2000 FK5 (HH MM SS)
DC_2000_SEX STRING Array[82] corrected declination J2000 FK5 (DD MM SS)
CFREQ DOUBLE Array[82] central frequency (MHz)
CFREQ_VEL DOUBLE Array[82] central frequency velocity (km/s)
TIME DOUBLE Array[82] time (hours)
MJD FLOAT Array[82] Modified Julian Date (days)
LST DOUBLE Array[82] Local Sidereal Time (hours)
CHAN LONG Array[50] channel number
SNR DOUBLE Array[50, 82] signal to noise ratio converted to numbers (50 channels x 82 rows)
FLUX DOUBLE Array[50, 82] estimated flux density (Jy) [assuming max signal was 54 Jy]
FREQ_CHAN FLOAT Array[50, 82] observed frequency for each channel (MHz)
FREQ_CHAN_VEL DOUBLE Array[50, 82] observed frequency velocity for each channel (km/s)
OBJECT STRING Array[82] Ohio Sky Survey object in the beam path (beam/peak flux density Jy)

Acknowledments

Thanks to MichaelHotaling for the data's original transcription.

Citation

Méndez, A., Ortiz-Ceballos, K., Zuluaga, J. I., & Palencia-Torres, K. D. (2024). Arecibo Wow! II (in preparation).

Méndez, A., Ortiz-Ceballos, K., & Zuluaga, J. I. (2024). Arecibo Wow! I: An Astrophysical Explanation for the Wow! Signal. arXiv preprint arXiv:2408.08513.

License

Ohio SETI Data © 2024 by PHL @ UPR Arecibo is licensed under Creative Commons Attribution 4.0 International. To view a copy of this license, visit https://creativecommons.org/licenses/by/4.0/

Contact [email protected] for questions or suggestions.

v0a (October 14, 2024)