| First digits of jotfid/pointid | Category |
|---|---|
| 00 | HUT CAMERA SENSITIVITY TARGETS |
| 01 | HUT SPECTROMETER FOCUS TARGETS |
| 03 | CALIBRATION |
| 05 | WUPPE APERTURE POSITION CALIBRATORS |
| 06 | CALIBRATION |
| 11 | COMETS |
| 12 | PLANETS |
| 13 | ASTEROIDS, ETC. |
| 21 | SUPERGIANTS |
| 22 | OE/BE STARS |
| 23 | WOLF-RAYET STARS |
| 24 | RAPID ROTATORS |
| 25 | NORMAL WHITE DWARFS |
| 26 | MAGNETIC/PULSATING W.D. |
| 26 | MAGNETIC/PULSATING W.D.'S |
| 27 | PLANETARY NEBULA NUCLEI |
| 28 | NORMAL STARS A0 & LATER |
| 29 | HOT SUBDWARFS |
| 31 | PRE-MAIN SEQUENCE STARS |
| 32 | CATACLYSMIC VARIABLES |
| 33 | INTERACTING BINARIES |
| 34 | SYMBIOTIC STARS |
| 35 | ACTIVE CHROMOSPHERES |
| 36 | PULSATING VARIABLES |
| 38 | HIGH MASS X-RAY BINARIES |
| 41 | PLANETARY NEBULAE |
| 42 | REFLECTION NEBULAE |
| 43 | H II REGIONS |
| 44 | SUPER NOVA REMNANTS |
| 45 | I.S. POLARIZATION PROBES |
| 47 | HERBIG-HARO OBJECTS |
| 48 | DARK CLOUDS |
| 51 | METAL POOR GLOBULARS |
| 52 | METAL RICH GLOBULARS |
| 53 | OPEN (GALACTIC) CLUSTERS |
| 54 | O/B ASSOCIATIONS |
| 61 | NEARBY GALAXIES |
| 62 | SPIRALS |
| 63 | ELLIPTICALS |
| 64 | IRREGULARS |
| 65 | DWARFS |
| 66 | EDGE ON SYSTEMS |
| 71 | INTERACTING GALAXIES |
| 73 | RAPID STAR FORMATION |
| 74 | W/CIRCUMGALACTIC MATTER |
| 81 | SEYFERT I GALAXIES |
| 82 | SEYFERT II GALAXIES |
| 83 | RADIO GALAXIES |
| 84 | RADIO LOUD QUASISTELLAR OBJECTS |
| 85 | RADIO QUIET QUASISTELLAR OBJECTS |
| 86 | BL LACERTAE OBJECTS |
| 88 | OVV QUASARS |
| 91 | SPIRAL POOR CLUSTERS |
| 92 | SPIRAL RICH CLUSTERS |
| 93 | X-RAY SELECTED CLUSTERS |
| 94 | DEEP SURVEY FIELDS |
| 95 | COOLING FLOW CLUSTERS |