Apply positional constrains on the objects returned by the query c Rectangular
Do you wish to search a rectangular box in ra and dec?
Valid formats (J2000):
raMin/raMax in decimal degrees or in sexagesimal hours, minutes, seconds.
decMin/decMax in decimal degrees or in sexagesimal degrees, arcminutes, arcseconds. Cone
Do you wish to search a circle on the sky centered on a single ra and dec?
For a given RA and DEC, the cone search returns all objects within the search radius that meet your search constraints.
Valid formats (J2000):
raCenter in decimal degrees or in sexagesimal hours, minutes, seconds.
decCenter in decimal degrees or in sexagesimal degrees, arcminutes, arcseconds.
‘radius’ in degree (D.ddd).
Proximity, ra, dec
Do you want to search the proximities for a list of ra and dec?
Proximity Search allows you to enter a list of RA/Dec positions and find objects near those positions. For each RA and Dec you enter, the proximity search returns objects within the specified search radius that meet your search constraints.
The list can be either entered directly into the box or uploaded as a file. In either case, the positions must be of the form:
ra dec [sep]
with each item separated by a comma or space. The first two numbers, “ra” and “dec,” are requried - these are the sky positions (J2000) around which to search. The third, “sep,” is optional - it is the separation distance or seach radius, in arcminutes, around which to search. If you do not enter a value for “sep,” the default is 2 arcsec.
Valid formats for positions are:
ra in decimal degrees; or in sexagesimal hours, minutes, seconds.
dec in decimal degrees; or in sexagesimal degrees, arcminutes, arcseconds.
sep in decimal arcsec.
Do you want to apply no positional constraints in your query? Note: This will result in a search over the entire database, which will probably take a very long time to finish (and slow other users down). Please be sure that this is what you want to do, or at least select a limited number of objects to return.
Observation Information， obsdate(lmjd)， Plan ID，Spectrograph ID，fiber ID
Do you wish to search objects with their observation information?
Observation information search allows you to select objects with four items, i.e., their observation date (obsdate(lmjd)), plate identification (Plan ID), spectrograph identification (Spectrograph ID), or fiber identification (Fiber ID).
Note: You should set one obsdate(lmjd), Plan ID, Spectrograph ID (from 1 to 16), Fiber ID (from 1 to 250), or you can select ‘all’ if you don’t want to constrain a certain item. lmjd in the bracket after obsdate means local modified Julian date.
Do you want to search over given range in magnitudes? You can search by ‘magtype’.
You can search objects with their magnitudes in u, g, r, i, z, J, H, and K. ALL of these magnitudes are extracted from the target magnitudes. For example, if you set “min” and “max” of g-band magnitudes, objects with g-band magnitude in “Target Magnitude Type” are your target sources, and those with g band magnitudes in the range between “min” and “max” are finally selected.
You can search objects with their target magnitude types. For example, if you set “target magnitude type” as “ugrijhk”, “mag1”, “mag2”, “mag3”, “mag4”, “mag5” , “mag6”, and “mag7” represents magnitude in u, g, r, i, j, h, and k band respectively. If you set “target magnitude type” as “gri”, “mag1”, “mag2”, and “mag3” represents magnitude in g, r, and i band respectively, while “mag4”, “mag5”, “mag6”, “mag7” all indicate NULL.
Do you want to search over a given range in redshift?
Redshifts less than zero are possible (e.g., for stars), as are redshifts greater than 3 (some QSOs, but also objects with poorly measured redshifts).
What type of objects (as automatically classified by their spectra) do you want returned from your query?
Do you want to search over a given range in radial velocity?
Radial velocities less than zero are possible (e.g., for stars), as are radial velocities greater than 1000 (extra-galaxy obejects, but also objects with poorly measured radial velocities).
Signal to Noise Ratio
Do you want to search over given range in u, g, r, i and/or z band signal to noise ratios?
Input Catalog Information
Do you want to search objects with their input information? The input information include “Target Source” which represents who submitted the observation catalog, “Target From” which indicates where the observation catalog from, and “Object Type” which means the input classifications . Before setting the “Target From”, you should select a “Target Source” first.
A F G K type Star Parameters, A type Star Parameters，M type Star Parameters
Do you wish to search stars with their spectra parameters?
For A, F, G, and K type stars, you can search objects by using effective temperature (teff), effective temperature error (teff_err), surface gravity (logg) , surface gravity error (logg_err), metal abundance (feh), and metal abundance error (feh_err).
For A type stars, you can search objects by using Balmer line indices (halphaindice, hbetaindice, hgamaindice, and hdeltaindice), and line widths (halph02, hbeta02, hgama02, and hdelta02).
For M type stars, you can search objects by using their magnetic activities (atcha).
Parameters to return
Which parameters do you want returned from your query?
You can download the returned parameters in formats of html, fits, csv, and vo tables.
Useful parameters combinations:
typical (obsdate, planid, spid, fiberid, ra, dec, class, subclass, z, rv, logg, feh, teff)
minimal (obsdate, planid, spid, fiberid, ra, dec, class)
maximal (obsid, designation, obsdate, lmjd, planid, spid, fiberid, ra, dec, snru, snrg, snrr, snri, snrz, objtype, class, subclass, magtype, mag1, mag2, mag3, mag4, mag5, mag6, mag7, tsource, fibertype, tfrom ,tinfo, z, z_err, rv, rv_err, halphaindice, hbetaindice, hgamaindice, hdeltaindice, halph02, hbeta02, hgama02, hdelta02, logg, logg_err, feh, feh_err, teff, teff_err, and atcha).