Welcome to the CfA Optical/Infrared Science Archive (OIRSA)!

This site provides a simple interface for downloading large batches of processed spectra, obtained from optical/infrared spectrographs on the CfA's ground-based telescopes. To get started, click the Search Data button up top!

The CfA ORISA's current holdings are as follows:

• Hectospec: some 600,000 moderate-dispersion optical spectra acquired since 2004 at the MMT Observatory, homogeneously reduced with the latest version of HSRED v2.0
• Hectochelle: over 400,000 high-resolution (R ~ 32,000 to 40,000) optical spectra collected since 2004 at the MMT Observatory
• FAST: more than 140,000 medium-dispersion optical spectra of some 72,000 objects taken since 1994 at the Whipple Observatory
• Echelle: about 250,000 high-dispersion (R ~ 36,000 or 8.7 km/s) optical spectra of bright stars (V < 13 on 1.5 m to V < 15 on 6.4 m) taken from 1978 to 2009 at the Whipple Observatory, MMT Observatory, and Oak Ridge Observatory

If you make use of any spectra provided here, we ask that you cite the relevant instrument, pipeline, and/or data archive papers from the table below, as well as the original publication reference for the spectra you use (provided with all search results).

• Hectospec Multi-Fiber Spectrograph
• Instrument webpage
• Data reduction pipeline: HSRED
• Instrument paper: Hectospec, the MMT's 300 Optical Fiber-Fed Spectrograph
• Specification of Hectospec data
• Hectochelle Multi-Fiber Spectrograph
• Instrument webpage
• Instrument paper: Hectochelle: A Multiobject Optical Echelle Spectrograph for the MMT
• FAST Long-slit Spectrograph
• Instrument webpage
• Data reduction pipeline
• Instrument paper: The FAST Spectrograph for the Tillinghast Telescope
• Data archive paper: Center for Astrophysics Optical Infrared Science Archive. I. FAST Spectrograph
• Echelle Spectrograph
• Instrument webpage (FLWO)
• Data archive paper: Thirty Years of Echelle Spectra Made Public