For GeoJSON, all coordinates need to be given in degrees, longitude as [-180...180] deg, latitude as [-90...90] deg
stars.6.json, stars.8.json, stars.14.json: the number indicates limit magnitude
{
"type": "FeatureCollection",
"features": [{
"type": "Feature",
"id": "", // Hipparcos number
"properties": {
"mag": "", // Apparent magnitude
"bv": "" // b-v color index
},
"geometry": {
"type": "Point",
"coordinates": [lon, lat]
}
}, { } ]
}starnames.json: Magnitude independent, all stars with a name/designation other than HIP/HD
{"id": { // Hipparcos number
"name": "", // Proper name
... // and names in 17 further languages (see list in main readme)
"desig": "", // Standard designation, first from list below
"bayer": "", // Bayer
"flam": "", // Flamsteed
"var": "", // Variable star
"gliese": "", // Gliese
"hd": "", // Henry Draper
"hip": "" // Hipparcos number again
}, "id": {...}
}##Traditional Chinese star and DSO names
starnames.cn.json, dsonames.cn.json:
{"id": { // Hipparcos number
"name": "", // Chinese name
"desig": "", // IAU designation
"en": "", // English translation
"pinyin": "" // Pinyin transcription
}, "id": {...}
}dsos.6.json, dsos.14.json: the number indicates limit magnitude
dsos.bright.json: hand selected
lf.json: Local group
messier.json Messier objects
{
"type": "FeatureCollection",
"features": [{
"type": "Feature",
"id": "", // Short designator
"properties": {
"desig": "", // Designator
"type": "", // Object type: gg, g, s, s0, sd, i, e, oc, gc, dn, bn, sfr, rn, en, pn, snr
"morph": "", // Morphology classification depending on type
"mag": "", // Apparent magnitude, 999 if n.a.
"dim": "", // Angular dimensions in arcminutes
"bv": "" // Blue minus visual magnitude color inder (b-v)
},
"geometry": {
"type": "Point",
"coordinates": [lon, lat]
}
}, { } ]
}Object type: gg: galaxy cluster, g: galaxy, s: spiral galaxy, s0: lenticular gal., sd: dwarf spheroidal gal., i: irregular gal., e: elliptical gal., oc: open cluster, gc: globular cluster, dn: dark nebula, bn: bright nebula, sfr: star forming region, rn: reflection nebula, en: emission nebula, pn: planetary nebula, snr: supernova remnant
additional lg.json properties:
sub: Sub group membership: [MW|M31|N3109|LG] (Milky Way, Andromeda, NGC 3109, gen. LG)
pop: MW populations [OH|YH|BD] (Old halo, young halo, bulge & disk), M31 populations [M31|GP] (gen. M31, great plane)
str: Tidal streams [Mag|Sgr|CMa|FLS] (Magellanic Stream, Sagittarius Stream, Canis Major/Monoceros Stream, Fornax-Leo-Sculptor Great Circle)
dsonames.json: Magnitude/dimension independent, all DSOs with a proper name
{"id": { // most common designation (NGC, IC, M, ...)
"name":"", // Proper name (in English)
... // and names in up to 17 further languages (see list in main readme)
}constellations.json
{
"type": "FeatureCollection",
"features": [{
"type": "Feature",
"id": "", // 3-letter designator
"properties": {
"name": "", // full IAU name
"desig": "", // 3-letter designator again
"gen": "", // genitive for naming stars, not yet used
"rank": "", // 1-3 for differential name display by size/brightness
"en": "", // english name
... // and names in 18 further languages (see list in main readme)
"display": [] // [ra,dec,scale], for single constellation display
},
"geometry": {
"type": "Point",
"coordinates": [lon, lat] // Position of const. name
}
}, { } ]
}constellations.lines.json, constellations.lines.cn.json
{
"type": "FeatureCollection",
"features": [{
"type": "Feature",
"id": "", // 3-letter designator of constellation
"geometry": {
"type": "MultiLineString",
"coordinates": [[[lon, lat],[lon, lat],..],[[]lon, lat,[lon, lat],..],..]
}
}, { } ]
}constellations.bounds.json, constellations.bounds.cn.json
{
"type": "FeatureCollection",
"features": [{
"type": "Feature",
"id": "", // 3-letter designator of constellation
"geometry": {
"type": "Polygon",
"coordinates": [[[lon, lat],[lon, lat],..]]
},
}, { } ]
}##Traditional Chinese constellations
constellations.cn.json
{
"type": "FeatureCollection",
"features": [{
"type": "Feature",
"id": "", // numerical id
"properties": {
"name": "", // chinese name
"en": "", // english translation
"pinyin": "", // pinyin transcription
"desig": "", // also chinese name, for compatibility
"rank": "", // so far only 1; differential name display by size/brightness
"display": [] // [ra,dec,scale], for single constellation display
},
"geometry": {
"type": "Point",
"coordinates": [lon, lat] // Position of const. name
}
}, { } ]
}mw.json
{
"type": "FeatureCollection",
"features": [{
"type": "Feature",
"id": "", // ol 1-5
"properties": {},
"geometry": {
"type": "MultiPolygon",
"coordinates":[[[[lon, lat],[lon, lat],..],[[lon, lat],[lon, lat],..],..]]
}
}, { } ]
}{
"type": "FeatureCollection",
"features": [{
"type": "Feature",
"id": "",
"geometry": {
"type": "LineString",
"coordinates": [[lon, lat],[lon, lat]]
}
}, { } ]
}{
"type": "FeatureCollection",
"features": [{
"type": "Feature",
"id": "", // Name without spaces
"properties": {
"n": "", // Proper name
"es": "", // Proper name in spanish
"loc": [lon,lat], // Center location of name string
"p": n // Priority 1..6 (~Average brighness)
// p=6: Guiding line
},
"geometry": {
"type": "MultiLineString",
"coordinates": [[[lon, lat],[lon, lat],..],[[]lon, lat,[lon, lat],..],..]
}
}, { } ]
}Not geojson, because positions need to be calculated by date from keplerian elements
All element values in degrees, except a (AU|km) and e (dimensionless)
"id":{ // (usually) 3-letter id
"name": "", // full name
"trajectory": bool, // show trajectory (tbi)
"H": n, // absolute magnitude
"elements":[{
"a": "da": Semimajor axis / change per century (all 'dx' fields)
"e": "de": Eccentricity
"i": "di": Inclination
"L": "dL": or "M": "dM": mean longitude (M*Q) or mean anomaly
"W": "dW": or "w": "dw": longitude of periapsis (w*N) or argument of periapsis
"N": "dn": longitude of the ascending node
"ep":"2000-01-01" epoch, default date
}],
"desig": "", // 3-Letter designation
... // Names in 14 different languages, see list in main readme
}