ESOB (M0): ESO/Uppsala Survey: ESO(B) Atlas; -90 <Dec< -17 (19910829)
FILE:
File Dec (2000) Range #Objects
esob_e.m0 equatorial sky: -40< Dec <-17 9622
esob_s.m0 southern sky: -90< Dec <=-40 8795
CONTENTS: ESO/Uppsala Survey: ESO(B) Atlas
DATASET: These files come in HyperSky dataset M-3, 19910829 Availability on HyperSky CD-ROM: Vol. 1 (1993)
DESCRIPTION: These datafiles contain a total of 18417 objects from the ESO/Uppsala blue-light survey of the southern sky, by Andris Lauberts. The survey, commonly known as the ESO(B) survey or "Quick Blue Survey" was done by the ESO 1-meter Schmidt telescope at La Silla, Chili, with results published in 1982.
The survey consists of 606 fields at 5-degree centers and covers the southern sky from -90 to -17.5. (For HyperSky users, these fields can be identified using file eso_serc.a0, available in dataset A-1). A systematic search of the field plates was carried out at the Uppsala Observatory (Sweden) to find, list and describe the following objects:
1. All NGC+IC galaxies in -30<Dec<-20, plus all Vorontsov-Velyaminov and Arp objects.
2. All galaxies beyond these catalogs down to a limiting diameter of 1.0 arc minute.
3. All disturbed galaxies as faint as possible.
4. All star clusters in the Budapest Catalog, plus smaller and fainter clusters if easily recognizable.
5. All planetary nebulae that were listed in available catalogs.
A total of 18438 objects are listed in the atlas, some 60% being listed for the first time anywhere. Of these, the HyperSky files contain all but a few spurious objects (usually either asteroid or comet trails).
DATA: The HyperSky datafiles contain the following data from the atlas:
MAG: Magnitudes were not provided for most objects in the ESO(B) atlas. The exception are 2102 galaxies, for which B-magnitudes (and radial velocities) have been provided and are included in the HyperSky files. WARNING: All objects without magnitudes will disappear if HyperSky's faint limiting faint "misc object" magnitude is raised above its default! This is because HyperSky assigns the default faint limit to objects without magnitudes.
TYPE: object type generally according to the same 2-character code used in HED, the HyperSky data editor. See the paragraph "OBJECT DATAFILE CLASS TYPES" in the user manual DATAFILES section for a description of these codes.
IDENTIFICATION: The ESO identification for the object, which has the general form "FFF-CC NN", where FFF is the number of the ESO field containing the object, CC is the object class identifier, and NN is running number of the object in the field FFF. For CC, the first character may be blank. The following list contains most CC object classes used in the catalog:
* - star N - nebula
** - asterism N* - nebula + star (or *N)
EN - emission nebula PN - planetary nebula
G - galaxy SC - star cluster
G* - galaxy + star SN - supernova remnant (or NR)
IG - interacting galaxies ? - unknown
COMMENTS: The comment lines contain the following information, provided if available for each object:
* Alternate object identifications, where N=NGC, I=IC, M=Messier. GCl and OCl are Budapest Catalog identifications of globular and star clusters, respectively. PK refers to the Perek-Kohoutek catalog of planetary nebulae. Other less commonly occurring designations are listed in the ESO paper by Lauberts.
* Estimated galaxy types corresponding to the well-known Hubble "tuning fork" classification system, with the addition of type SB0. All elliptical galaxies are denoted by E regardless of ellipticity.
* Concise descriptions highlighting object properties. The ESO(B) atlas has packed a tremendous amount of useful information into these comments.
* The length of galaxy major and minor axes, in the form Dxd' (minutes of arc).
* Galaxy position angles, measured in degrees from north through east (range 0 to 180 degrees). This value is flagged by "PA=".
* The heliocentric radial velocity, in units of km/sec. This value is flagged by "RV=".