| Bit name |
Binary digit |
Description |
| QSO_HIZ |
0 |
High-redshift (griz) QSO target |
| QSO_CAP |
1 |
ugri-selected quasar at high Galactic latitude |
| QSO_SKIRT |
2 |
ugri-selected quasar at low Galactic latitude |
| QSO_FIRST_CAP |
3 |
FIRST source with stellar colors at high Galactic latitude |
| QSO_FIRST_SKIRT |
4 |
FIRST source with stellar colors at low Galactic latitude |
| GALAXY_RED |
5 |
Luminous Red Galaxy target (any criteria) |
| GALAXY |
6 |
Main sample galaxy |
| GALAXY_BIG |
7 |
Low-surface brightness main sample galaxy (mu50>23 in r-band) |
| GALAXY_BRIGHT_CORE |
8 |
Galaxy targets who fail all the surface brightness selection limits but have r-band fiber magnitudes brighter than 19 |
| ROSAT_A |
9 |
ROSAT All-Sky Survey match, also a radio source |
| ROSAT_B |
10 |
ROSAT All-Sky Survey match, have SDSS colors of AGNs or quasars |
| ROSAT_C |
11 |
ROSAT All-Sky Survey match, fall in a broad intermediate category that includes stars that are bright, moderately blue, or both |
| ROSAT_D |
12 |
ROSAT All-Sky Survey match, are otherwise bright enough for SDSS spectroscopy |
| STAR_BHB |
13 |
blue horizontal-branch stars |
| STAR_CARBON |
14 |
dwarf and giant carbon stars |
| STAR_BROWN_DWARF |
15 |
brown dwarfs (note this sample is tiled) |
| STAR_SUB_DWARF |
16 |
low-luminosity subdwarfs |
| STAR_CATY_VAR |
17 |
cataclysmic variables |
| STAR_RED_DWARF |
18 |
red dwarfs |
| STAR_WHITE_DWARF |
19 |
hot white dwarfs |
| SERENDIP_BLUE |
20 |
lying outside the stellar locus in color space |
| SERENDIP_FIRST |
21 |
coincident with FIRST sources but fainter than the equivalent in quasar target selection (also includes non-PSF sources |
| SERENDIP_RED |
22 |
lying outside the stellar locus in color space |
| SERENDIP_DISTANT |
23 |
lying outside the stellar locus in color space |
| SERENDIP_MANUAL |
24 |
manual serendipity flag |
| QSO_MAG_OUTLIER |
25 |
Stellar outlier; too faint or too bright to be targeted |
| GALAXY_RED_II |
26 |
Luminous Red Galaxy target (Cut II criteria) |
| ROSAT_E |
27 |
ROSAT All-Sky Survey match, but too faint or too bright for SDSS spectroscopy |
| STAR_PN |
28 |
central stars of planetary nebulae |
| QSO_REJECT |
29 |
Object in explicitly excluded region of color space, therefore not targeted at QSO |
| SOUTHERN_SURVEY |
31 |
Set in primtarget if this is a special program target |
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