| Guide |
Input Format
|
Telescope & Instrument
Select one or more telescope+instrument combinations.
Examples
MMT 6.5 + Hectospec |
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Object Name 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 |
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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) |
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Advanced Options - 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) 2006-10-01 .. 2007-12-01 (between Oct. 1, 2006 and Dec. 1, 2007) 2007-11-15 +/- 5 (5 days around Nov. 15, 2007) |
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Advanced Options - 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) |
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Advanced Options - 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) |
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Download or Summary Table
Select one of the file formats in the list.
Examples
"tar" (to download the spectra) "HTML" (to see a summary table) |
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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 |
Output Format
Hectospec Field Information
| Name | Description | UCD (Unified Content Descriptor) |
|---|---|---|
| RA | Right Ascension (deg), ICRS | pos.eq.ra;meta.main |
| Dec | Declination (deg), ICRS | pos.eq.dec;meta.main |
| Product Key | Download URL of spectrum | meta.ref.url;meta.dataset |
| Owner | Dataset owner | |
| File Size | Spectrum file size | |
| Creator DataID | Dataset identifier assigned by the data center | meta.id |
| Bibliography | Bibliographic reference where the dataset is presented | meta.bib;meta.ref.url |
| Hecto Config | Hectospec configuration id | meta_id.src |
| z | Measured redshift of a target object | src.redshift |
| z_err | Measured redshift uncertainty | stat.error;src.redshift |
| SNR | Per-pixel signal-to-noise ratio estimated for this dataset | stat.snr |
| Aperture | Fiber aperture diameter, arcsec | instr.fov |
| Date Obs. | Midpoint of the exposure | time.epoch |
| Exp. Time | Total exposure time | time.duration |
| Mid. Band | Mid spectral bandpass, Angstrom | em.wl;instr.bandpass |
| Bandwidth | Spectral bandwidth, Angstrom | em.wl;instr.bandwidth |
| Band Start | Starting wavelength, Angstrom | em.wl;stat.min |
| Band End | Ending wavelength, Angstrom | em.wl;stat.max |
