CfA Optical/Infrared Science Archive

Search Data

Query Form [x]

- Select Search Constraints and Output, then click the Search button.
- Leave an Advanced Option field empty to search over the full range.
- Choose TAR to download all the spectra, or HTML/Text/VOTable to view a summary table with links.

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Dataset

Telescope & Instrument

Select one or more telescope+instrument combinations.

Search Constraints

Object Name (SIMBAD)
or Coordinates (J2000)

Object Name (SIMBAD) or Coordinates (J2000)

SIMBAD-resolvable object name, or search position in RA and Dec (decimal degrees or sexagesimal formats [hh mm ss dd mm ss])

Examples

M81
148.888 69.065
9 55 33.2 69 03 55

Search Radius (arcmin)

Search radius (arcmin) around given point coordinates

Examples

1.0

Input File Upload

Upload a list of target positions. This expects a text file with three floats per line: RA (deg), Dec (deg), & search radius (arcsec).

Examples

148.888 69.065 60 (line 1)
10.68471 41.268750 90 (line 2)

Clear the Input File

Advanced Options

Leave the Advanced Option empty to select the full range.

Observation Dates

Observation date (midpoint of exposure) in the format of YYYY-MM-DD. Operators <, >, +/- and .. (between) can be used to select a range.

Examples

2006-05-04 -- on May 5, 2006
>2012-02-01 -- later than Feb. 1, 2012
2007-11-15 +/- 5 -- 5 days around Nov. 15, 2007
2006-10-01 .. 2007-12-01 -- between Oct. 1, 2006 and Dec. 1, 2007

Redshift z

Redshift z of target object. Operators <, >, +/- and .. (between) can be used to select a range.

Examples

0.2 or =0.2 -- select only values exactly 0.2
!=0.2 -- select only values different from 0.2
<0.15 -- select values samller than 0.15
>=0.2 -- select values greater or equal to 0.2
0.2 +/- 0.05 -- select values between 0.15 and 0.25 inclusive
0.13 .. 0.18 -- select values between 0.13 and 0.18 inclusive

SNR (Signal-to-Noise Ratio)

Per-pixel S/N averaged over 100 pixels at the center of the spectrum. Operators <, >, +/- and .. (between) can be used to select a range.

Examples

100 or =100 -- select only values exactly 100
!=100 -- select only values different from 100
<150 -- select values samller than 150
>=200 -- select values greater or equal to 200
200 +/- 50 -- select values between 150 and 250 inclusive
130 .. 180 -- select values between 130 and 180 inclusive

Output

Download or Summary Table

Select one of the file formats in the list.

Examples

"tar" (to download the spectra)
"HTML"

Output Table

Sort the result in ascending order by the chosen keyword up to the number of spectra you specified.

Examples

Sort by "Date Obs."
Limited to "5000" items

Sort by
Limit to items